阅读说明：本技术 生物基a2+b3型超支化环氧树脂前驱体、改性组合物、其制备方法与应用 (Bio-based A2+ B3 type hyperbranched epoxy resin precursor, modified composition, preparation method and application thereof ) 是由 代金月 刘小青 腾娜 于 2021-01-11 设计创作，主要内容包括：本发明公开了一种生物基A2+B3型超支化环氧树脂前驱体,其具有下式所示结构：本发明还公开了一种超支化环氧树脂改性组合物,其包含所述生物基A2+B3型超支化环氧树脂前驱体。本发明还公开了所述生物基A2+B3型超支化环氧树脂前驱体、超支化环氧树脂改性组合物及其固化物的制备方法和应用。本发明的超支化环氧树脂改性组合物的制备流程简单,操作方法简便,可控制性好,易于实施,适用于大规模工业化生产。本发明的超支化环氧树脂改性组合物对应的固化物能够在保持出色的阻燃性的同时,还能够赋予固化物优异的韧性,兼具优异的耐冲击性能和阻燃性能,在航空航天领域有着非常广阔的应用前景。(The invention discloses a biobased A2+ B3 type hyperbranched epoxy resin precursor, which has a structure shown in the following formula: the invention also discloses a hyperbranched epoxy resin modified composition which comprises the bio-based A2+ B3 type hyperbranched epoxy resin precursor. The invention also discloses a preparation method of the bio-based A2+ B3 type hyperbranched epoxy resin precursor, a hyperbranched epoxy resin modified composition and a cured product thereofMethods and uses. The hyperbranched epoxy resin modified composition has the advantages of simple preparation process, simple and convenient operation method, good controllability and easy implementation, and is suitable for large-scale industrial production. The cured product corresponding to the hyperbranched epoxy resin modified composition can keep excellent flame retardance, can endow the cured product with excellent toughness, has excellent impact resistance and flame retardance, and has very wide application prospect in the aerospace field.)

1. A biobased A2+ B3 type hyperbranched epoxy resin precursor is characterized in that the biobased A2+ B3 type hyperbranched epoxy resin precursor has a structure as shown in a formula (I):

wherein R isR₁Includes H, CH₃O or C₂H₅O，R₂IncludedR₃Comprising CH₃O、C₁₅H_31-mOr C₃H₇M is 0, 2, 4 or 6;

m comprisesN comprises

Includedn is 2 to 10.

2. A method for preparing the bio-based hyperbranched epoxy resin precursor of type a2+ B3 of claim 1, characterized by comprising:

reacting a first mixed reaction system containing a bio-based flame-retardant diphenol monomer shown in a formula (II), a bio-based tri-functionality epoxy monomer shown in a formula (III), a phase transfer catalyst and an organic solvent at 80-120 ℃ for 6-24 h in a nitrogen atmosphere, and reacting phenolic hydroxyl of the bio-based flame-retardant diphenol monomer with an epoxy group of the bio-based tri-functionality epoxy monomer to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

wherein R is₁Includes H, CH₃O or C₂H₅O，R₂IncludedR₃Including CH₃O、C₁₅H_31-mOr C₃H₇And m is 0, 2, 4 or 6.

3. The method of claim 2, wherein: the molar ratio of the bio-based flame retardant diphenol monomer, the bio-based tri-functionality epoxy monomer and the phase transfer catalyst is 1: 2-10: 0.03-0.06;

and/or the phase transfer catalyst comprises one or the combination of more than two of tetrabutylammonium bromide, benzyltriethylammonium chloride, tetradecyltrimethylammonium chloride, tetrabutylammonium hydrogen sulfate, trioctylmethylammonium chloride, tetrabutylammonium iodide and benzyltriethylammonium bromide;

and/or the organic solvent comprises one or the combination of more than two of tetrahydrofuran, dioxane, dimethyl sulfoxide, N-dimethylformamide and N, N-dimethylacetamide.

4. The production method according to claim 2, characterized by comprising:

so that the catalyst contains a compound having R₁First compound of group, having R₂Second compound of group, having R₃Carrying out condensation reaction on a second mixed reaction system of a third compound of the group and an acid catalyst at the temperature of 80-160 ℃ for 6-24 h to prepare the bio-based flame-retardant diphenol monomer shown in the formula (II);

wherein the first compound comprises aldehyde-containing bio-based phenolic monomers, R₁Includes H, CH₃O or C₂H₅O；

The second compound comprises a phosphorus-containing monomer, R₂Included

The third compound comprises a bio-based phenolic monomer with a structural formula Wherein m is 0, 2, 4 or 6.

5. The method of claim 4, wherein: said has R₁The first compound of the group comprises any one or the combination of more than two of vanillin, p-hydroxybenzaldehyde, o-vanillin, ethyl vanillin and salicylaldehyde;

and/or said has R₂The second compound of the group comprises 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and/or 5, 10-dihydro-phosphazine-10-oxide;

and/or the molar ratio of the first compound to the second compound to the third compound is 1: 3-12;

and/or the acid catalyst comprises any one or the combination of more than two of organic acid, inorganic acid and Lewis acid;

and/or the mass ratio of the acidic catalyst to the phosphorus-containing monomer is 3-6: 100.

6. A hyperbranched epoxy resin modified composition is characterized by comprising: the bio-based hyperbranched epoxy resin precursor of type A2+ B3, as set forth in claim 1, a second epoxy resin precursor, an epoxy curing agent, and a curing accelerator.

7. The hyperbranched epoxy resin modified composition of claim 6, wherein: the second epoxy resin precursor comprises any one of the following structures and/or an oligomer of any one of the following structures;

wherein X, Y and Z are each independently selected from:

R₄、R₅、R₆and R₇Are independently selected from hydrogen atoms, alkyl of C1-C6, alkoxy of C1-C6, phenyl, phenoxy or cycloalkyl of C3-C7;

and/or the epoxy curing agent comprises an amine curing agent and/or an anhydride curing agent, preferably, the amine curing agent comprises any one or a combination of more than two of m-phenylenediamine, diaminodiphenylmethane, m-xylylenediamine, diamino diphenyl sulfone, biphenyl diamine, o-phenylenediamine, p-xylylenediamine and decamethylenediamine; preferably, the acid anhydride curing agent includes one or a combination of two or more of terephthalic acid anhydride, biphenyl acid anhydride, methyl hexahydrophthalic anhydride, trimellitic anhydride, phthalic anhydride, phenylsuccinic anhydride, pyromellitic dianhydride, 1, 8-naphthalic anhydride, 1, 2-naphthalic anhydride, 2, 3-pyrazinoic dianhydride, 3-hydroxyphthalic anhydride, 2, 3-naphthalenedicarboxylic anhydride and 2, 3-pyridinedicarboxylic anhydride;

and/or the mass ratio of the bio-based A2+ B3 hyperbranched epoxy resin precursor to the combination of the bio-based A2+ B3 hyperbranched epoxy resin precursor and the second epoxy resin precursor is 10-50: 100;

and/or the ratio of the sum of the epoxy equivalent values of the bio-based A2+ B3 type hyperbranched epoxy resin precursor and the second epoxy resin precursor to the active hydrogen or anhydride group equivalent value of the epoxy curing agent is 100 to (10-100);

and/or the curing accelerator comprises any one or the combination of more than two of tertiary amine, tertiary amine salt, quaternary ammonium salt, imidazole compound, organic phosphorus compound, acetylacetone metal salt, carboxylic acid metal salt and boron trifluoride amine complex;

and/or the mass ratio of the curing accelerator to the combination of the bio-based A2+ B3 hyperbranched epoxy resin precursor, the second epoxy resin precursor and the epoxy curing agent is 0.05-0.5: 100.

8. A preparation method of a hyperbranched epoxy resin cured product is characterized by comprising the following steps: subjecting the hyperbranched epoxy resin modified composition of any one of claims 6-7 to gradient curing at 100-180 ℃.

9. The hyperbranched cured epoxy resin prepared by the method of claim 8, wherein the impact strength of the hyperbranched cured epoxy resin is 30-90 kJ/m²And the flame retardant performance is above V1 level.

10. Use of the hyperbranched epoxy resin modified composition of any one of claims 6 to 7 or the hyperbranched epoxy resin cured product of claim 9 in the field of aerospace; preferably, the use comprises: the hyperbranched epoxy resin modified composition or the hyperbranched epoxy resin cured product is used in an impact-resistant part.

Technical Field

The invention relates to thermosetting epoxy resin, in particular to a bio-based A2+ B3 type hyperbranched epoxy resin precursor with a phosphorus-containing halogen-free structure, a modified composition thereof, a preparation method and application thereof, and belongs to the technical field of macromolecules.

Background

Epoxy resin is a general thermosetting resin, has very wide application, and is widely applied to the fields of aerospace, coating, adhesives, circuit packaging and the like due to excellent comprehensive performance.

At present, the epoxy resin has the problems of low limiting oxygen index and easy combustion. The traditional flame-retardant modification method is mainly to use a halogen-containing flame retardant as an additive or a copolymer to physically or chemically modify epoxy resin, so that the purpose of good flame-retardant performance of the material is achieved. However, these halogen-containing polymers release corrosive and toxic gases during combustion, which can cause significant harm to both the human body and the environment. Therefore, research into halogen-free flame retardants has become more important in recent years, and among them, phosphorus-based flame retardants are receiving the most attention. The phosphorus-based flame retardant can impart excellent flame retardancy to the epoxy resin. In recent years, researchers have paid much attention to the realization of dual greening of raw materials and flame retardants by utilizing the combination of phosphorus flame retardants and epoxy resins. For example, chinese patent document CN108192078A discloses a full-flame-retardant epoxy resin containing 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) structure, which utilizes the multiple functionality of gallic acid to introduce a flame-retardant group and an epoxy group at the same time, the cured material shows good flame-retardant performance, and four cases in nine embodiments all reach the V0 level.

In addition, the cured epoxy resin has a highly crosslinked network structure, so that the cured epoxy resin has poor toughness and high brittleness, and further popularization and application of the cured epoxy resin are limited. Meanwhile, the reactive phosphorus flame retardants disclosed by the invention have higher rigidity, and when the reactive phosphorus flame retardants are applied to an epoxy resin system, the brittleness of the prepared material becomes higher, and the application range is more limited. In recent years, methods for toughening epoxy systems with hyperbranched epoxies have attracted considerable attention and have proven to be an effective epoxy toughening method. The hyperbranched epoxy resin toughened epoxy resin can improve the impact resistance of the material and does not sacrifice the mechanical property of the material.

The bio-based epoxy resin is an indispensable important component in the bio-based polymer material. The polymer material can reduce the dependence on petrochemical resources, has the dual effects of saving resources and protecting the environment, and has very important significance for realizing the green sustainable development of the polymer material.

Disclosure of Invention

The invention mainly aims to provide a bio-based A2+ B3 type hyperbranched epoxy resin precursor and a preparation method thereof, thereby overcoming the defects of the prior art.

The invention also aims to provide a hyperbranched epoxy resin precursor modified composition, a cured product, and a preparation method and application thereof.

In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:

the embodiment of the invention provides a bio-based A2+ B3 type hyperbranched epoxy resin precursor, which has a structure as shown in a formula (I):

wherein R comprisesR₁Includes H, CH₃O or C₂H₅O，R₂IncludedR₃Including CH₃O、C₁₅H_31-mOr C₃H₇M is 0, 2, 4 or 6;

m comprisesN comprises

Includedn is 2 to 10.

The embodiment of the invention also provides a preparation method of the bio-based A2+ B3 type hyperbranched epoxy resin precursor, which comprises the following steps:

reacting a first mixed reaction system containing a bio-based flame-retardant diphenol monomer shown in a formula (II), a bio-based tri-functionality epoxy monomer shown in a formula (III), a phase transfer catalyst and an organic solvent at 80-120 ℃ for 6-24 h in a nitrogen atmosphere, and reacting phenolic hydroxyl of the bio-based flame-retardant diphenol monomer with an epoxy group of the bio-based tri-functionality epoxy monomer to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

wherein R is₁Includes H, CH₃O or C₂H₅O，R₂IncludedR₃Including CH₃O、C₁₅H_31-mOr C₃H₇And m is 0, 2, 4 or 6.

The embodiment of the invention also provides a hyperbranched epoxy resin modified composition, which comprises: the bio-based A2+ B3 hyperbranched epoxy resin precursor, the second epoxy resin precursor, the epoxy curing agent and the curing accelerator.

The embodiment of the invention also provides a preparation method of the hyperbranched epoxy resin cured material, which comprises the following steps: and carrying out gradient curing on the hyperbranched epoxy resin modified composition at the temperature of 100-180 ℃.

The embodiment of the invention also provides a hyperbranched epoxy resin cured product prepared by the method, and the impact strength of the hyperbranched epoxy resin cured product is 30-90 kJ/m²And the flame retardant performance is above V1 level.

The embodiment of the invention also provides application of the hyperbranched epoxy resin modified composition or the hyperbranched epoxy resin cured product in the aerospace field.

The embodiment of the invention also provides a device with a high-low temperature impact-resistant and heat-resistant flame-retardant structure, wherein the high-low temperature impact-resistant and heat-resistant flame-retardant structure comprises the hyperbranched epoxy resin cured product.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, a series of bio-based A2+ B3 type hyperbranched epoxy resin precursors are obtained through simple reaction by adopting rich-source bio-based raw materials, and the monomer has a high-degree branched structure while containing a large amount of flame-retardant elements; the hyperbranched epoxy resin modified composition has the advantages of simple preparation method, easy operation, good controllability of reaction conditions, easy implementation and suitability for large-scale industrial production; meanwhile, the resin material obtained by correspondingly curing the hyperbranched epoxy resin modified composition has excellent impact resistance and flame retardance, can keep excellent flame retardance, can endow a cured product with excellent toughness, is suitable for high-end application fields with high toughness and high flame retardance requirements on polymer materials, and has very wide application prospects.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a nuclear magnetic resonance hydrogen spectrum (1H-NMR) chart of a biobased A2+ B3 type hyperbranched epoxy resin precursor prepared in example 1 of the invention.

Detailed Description

In view of the defects of the prior art, the inventor of the present invention has long studied and largely practiced to propose the technical solution of the present invention, which will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the invention, the inventor prepares a novel bio-based flame-retardant toughened hyperbranched epoxy resin by using renewable itaconic acid as a main raw material, and the addition of the resin can endow the material with excellent toughness and simultaneously improve the mechanical strength of the material.

The design concept of the invention mainly lies in that: the inventor combines three concepts of flame retardance, hyperbranched property and bio-based raw materials to prepare a series of bio-based A2+ B3 type hyperbranched epoxy resin precursors, and the precursors are used for modifying the traditional epoxy resin to obtain a series of thermosetting resin materials with excellent comprehensive performance.

Briefly, the inventor utilizes the diversity of bio-based raw materials to obtain a series of bio-based A2+ B3 type hyperbranched epoxy resin precursors by a simple and convenient method, wherein the precursors contain a large amount of flame retardant elements and have a highly branched structure, and can endow thermosetting resin with excellent flame retardant performance and impact resistance performance.

One aspect of the embodiments of the present invention provides a bio-based a2+ B3 type hyperbranched epoxy resin precursor having a structure as shown in formula (I):

wherein R comprisesR₁Includes H, CH₃O or C₂H₅O，R₂IncludedR₃Including CH₃O、C₁₅H_31-mOr C₃H₇M is 0, 2, 4 or 6;

m comprisesN comprises

Includedn is 2 to 10.

Another aspect of an embodiment of the present invention provides a method for preparing the bio-based hyperbranched epoxy resin precursor of type a2+ B3, which includes:

reacting a first mixed reaction system containing a bio-based flame-retardant diphenol monomer shown in a formula (II), a bio-based tri-functionality epoxy monomer shown in a formula (III), a phase transfer catalyst and an organic solvent at 80-120 ℃ for 6-24 h in a nitrogen atmosphere, and reacting phenolic hydroxyl of the bio-based flame-retardant diphenol monomer with an epoxy group of the bio-based tri-functionality epoxy monomer to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

wherein R is₁Includes H, CH₃O or C₂H₅O，R₂IncludedR₃Including CH₃O、C₁₅H_31-mOr C₃H₇And m is 0, 2, 4 or 6.

In some embodiments, the method of making comprises:

so that the catalyst contains a compound having R₁First compound of group, having R₂Second compound of group, having R₃Carrying out condensation reaction on a second mixed reaction system of a third compound of the group and an acid catalyst at the temperature of 80-160 ℃ for 6-24 h to prepare the bio-based flame-retardant diphenol monomer shown in the formula (II);

wherein the first compound comprises aldehyde-containing bio-based phenolic monomers, R₁Includes H, CH₃O or C₂H₅O；

The second compound comprises a phosphorus-containing monomer, R₂Included

The third compound comprises a bio-based phenolic monomer with a structural formula Wherein m is 0, 2, 4 or 6.

In some more specific embodiments, the method for preparing the bio-based hyperbranched epoxy resin precursor of type a2+ B3 comprises:

so that the catalyst contains a compound having R₁First compound of group, having R₂Of radicalsA second compound having R₃Carrying out condensation reaction on a second mixed reaction system of a third compound of the group and an acid catalyst at the temperature of 80-160 ℃ for 6-24 h to prepare a bio-based flame-retardant diphenol monomer, wherein the structural formula of the bio-based flame-retardant diphenol monomer is shown as the following formula (II);

placing a first mixed reaction system containing a bio-based flame-retardant diphenol monomer shown in a formula (II), a bio-based tri-functionality epoxy monomer shown in a formula (III), a phase transfer catalyst and an organic solvent in a nitrogen atmosphere at 80-120 ℃ for reacting for 6-24 h, and reacting phenolic hydroxyl of the bio-based flame-retardant diphenol monomer with an epoxy group on the bio-based tri-functionality epoxy monomer to finally obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

wherein the first compound comprises aldehyde-containing bio-based phenolic monomers, R₁Includes H, CH₃O or C₂H₅O；

The second compound comprises a phosphorus-containing monomer, R₂Included

The third compound comprises a bio-based phenolic monomer with a structural formula Wherein m is 0, 2, 4 or 6.

In some embodiments, the compound having R₁The first compound of the group comprises one or two of vanillin, p-hydroxybenzaldehyde, o-vanillin, ethyl vanillin, salicylaldehyde, etcCombinations of above, but not limited thereto.

Further, said R₁The starting material (i.e., the first compound) referred to is a p-sterically substituted monophenol monomer.

In some embodiments, the compound having R₂The second compound of the group includes, but is not limited to, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and/or 5, 10-dihydro-phosphazine-10-oxide (DPPA), and the like.

In some embodiments, the molar ratio of the first compound, the second compound, and the third compound is 1: 3 to 12.

Further, the acidic catalyst may be any one or a combination of two or more of an organic acid, an inorganic acid, and a lewis acid, for example, the inorganic acid may be phosphoric acid, sulfuric acid, nitric acid, boric acid, etc., but is not limited thereto. For example, the organic acid may be p-toluenesulfonic acid, trifluoroacetic acid, aminobenzenesulfonic acid, oxalic acid, acetic acid, citric acid, etc., but is not limited thereto. For example, the lewis acid may be ferric chloride, ferric bromide, zinc chloride, boron trifluoride, aluminum trichloride, etc., but is not limited thereto.

Further, the mass ratio of the acidic catalyst to the phosphorus-containing monomer is 3-6: 100, namely the acidic catalyst accounts for 3-6 wt% of the mass of the second compound (phosphorus-containing monomer).

In some embodiments, the molar ratio of the bio-based flame retardant diphenol monomer, the bio-based tri-functional epoxy monomer and the phase transfer catalyst is 1: 2 to 10: 0.03 to 0.06.

In some embodiments, the organic solvent ratio is any one or a combination of two or more of tetrahydrofuran, dioxane, dimethylsulfoxide, N-dimethylformamide, N-dimethylacetamide, and the like, but is not limited thereto.

In some embodiments, the phase transfer catalyst includes any one or a combination of two or more of tetrabutylammonium bromide, benzyltriethylammonium chloride, tetradecyltrimethylammonium chloride, tetrabutylammonium hydrogen sulfate, trioctylmethylammonium chloride, tetrabutylammonium iodide, benzyltriethylammonium bromide, and the like, but is not limited thereto.

In conclusion, the biobased A2+ B3 type hyperbranched epoxy resin precursor provided by the invention contains a large amount of flame retardant elements and also has a high-degree branched structure; the preparation method is simple, the operation is easy to understand, the reaction condition is controllable, the implementation is easy, and the method is suitable for large-scale industrial production.

Another aspect of an embodiment of the present invention also provides a hyperbranched epoxy resin modified composition, including: any one of the bio-based A2+ B3 hyperbranched epoxy resin precursor, the second epoxy resin precursor, the epoxy curing agent and the curing accelerator.

Further, the hyperbranched epoxy resin modified composition comprises the following four components:

(A) the biobased A2+ B3 type hyperbranched epoxy resin precursor;

(B) one or more epoxy resin precursors;

(C) one or more epoxy curing agents;

(D) a curing accelerator.

Wherein the bio-based A2+ B3 type hyperbranched epoxy resin precursor has a structure as shown in the formula (I):

wherein R isR₁Includes H, CH₃O or C₂H₅O，R₂Is composed ofR₃Including CH₃O、C₁₅H_31-mOr C₃H₇M is 0, 2, 4 or 6;

m isN is

Is composed ofn is 2 to 10.

In some embodiments, the second epoxy precursor comprises any one of the structures and/or oligomers of any one of the structures;

wherein X, Y and Z are each independently selected from:

R4、R₅r6 and R₇Are independently selected from hydrogen atoms, alkyl groups of C1-C6, alkoxy groups of C1-C6, phenyl, phenoxy or cycloalkyl groups of C3-C7.

Further, the epoxy resin precursor of component B may be more specifically bisphenol a diglycidyl ether, diglycidyl terephthalate, phenylenediamine tetraglycidyl amine, terephthalyl alcohol diglycidyl ether, bisphenol S diglycidyl ether, naphthalene benzenediamine tetraglycidyl amine, bisphenol F diglycidyl ether, cyclohexane dimethanol diglycidyl ether, hydroquinone diglycidyl ether, naphthalenediol diglycidyl ether, 4 '-dihydroxydiphenyl sulfide diglycidyl ether, 4' -dihydroxydiphenyl ether diglycidyl ether, 1, 4-diethylcyclohexanedimethanol diglycidyl ether, and the like, but is not limited thereto.

Further, the polymerization degree of the oligomer with the structure is 1-10.

In some embodiments, the component C epoxy curing agent is an amine curing agent, an anhydride curing agent, or the like, but is not limited thereto.

The amine-based curing agent is selected from one or a combination of two or more of rigid diamines such as m-phenylenediamine, diaminodiphenylmethane, m-xylylenediamine, diaminodiphenylsulfone (DDS), biphenyldiamine, o-phenylenediamine, p-xylylenediamine, and decamethylenediamine, but is not limited thereto.

Further, the acid anhydride curing agent is selected from one or a combination of two or more of rigid acid anhydrides such as isophthalic anhydride, biphenyl anhydride, methyl hexahydrophthalic anhydride, trimellitic anhydride, phthalic anhydride, phenylsuccinic anhydride, pyromellitic dianhydride, 1, 8-naphthalene dianhydride, 1, 2-naphthalene dianhydride, 2, 3-pyrazine dianhydride, 3-hydroxy phthalic anhydride, 2, 3-naphthalene dicarboxylic anhydride, and 2, 3-pyridine dicarboxylic anhydride, but is not limited thereto.

In some embodiments, the mass ratio of the bio-based hyperbranched epoxy resin precursor of A2+ B3 to the combination of the bio-based hyperbranched epoxy resin precursor of A2+ B3 and the second epoxy resin precursor is 10-50: 100, namely, the mass of the biobased A2+ B3 type hyperbranched epoxy resin precursor accounts for 10 to 50 percent (mass fraction) of the total mass of the biobased A2+ B3 type hyperbranched epoxy resin precursor and the second epoxy resin precursor after the biobased A2+ B3 type hyperbranched epoxy resin precursor is added.

In some embodiments, the ratio of the sum of the epoxy equivalent values of the bio-based hyperbranched epoxy resin precursor of type a2+ B3, the second epoxy resin precursor, and the active hydrogen or anhydride group equivalent value of the epoxy curing agent is 100: (10 to 100), that is, in other words, the ratio of the epoxy equivalent value (mole number) of the component A and B to the active hydrogen or acid anhydride group equivalent value (mole number) of the epoxy curing agent of the component C is 100: 10 to 100.

In some embodiments, component D cure accelerators include any one or a combination of two or more of tertiary amines, tertiary amine salts, quaternary ammonium salts, imidazole compounds, organophosphorus compounds, acetylacetone metal salts, carboxylic acid metal salts, boron trifluoride amine complexes, and the like, but are not limited thereto. Specifically, the curing accelerator may be 2-methylimidazole, dimethylphenylamine, zinc acetylacetonate, triethanolamine, hexadecyldimethylbenzyl ammonium, borontrifluoroethylamine, or the like, but is not limited thereto.

In some embodiments, the mass ratio of the curing accelerator to the combination of the bio-based hyperbranched epoxy resin precursor of type a2+ B3, epoxy resin precursor and epoxy curing agent is 0.05-0.5: 100, i.e., the component D curing accelerator is 0.05 to 0.5% with respect to the total mass of the component A, the component B and the component C.

Another aspect of the embodiments of the present invention further provides a method for preparing a cured product of a hyperbranched epoxy resin modified composition (i.e., the hyperbranched epoxy resin cured product), including: and (3) carrying out gradient curing on any one of the hyperbranched epoxy resin modified compositions within the range of 100-180 ℃ to finally obtain a hyperbranched epoxy resin cured product.

Further, a cured product of the hyperbranched epoxy resin modified composition is prepared from the following four components:

(A) the biobased A2+ B3 type hyperbranched epoxy resin precursor;

(B) one or more epoxy resin precursors;

(C) one or more epoxy curing agents;

(D) a curing accelerator.

In some embodiments, a method of preparing a cured article of the hyperbranched epoxy resin-modified composition comprises: stirring and mixing a bio-based A2+ B3 type hyperbranched epoxy resin precursor of the component A, an epoxy resin precursor of the component B, an epoxy curing agent of the component C and a curing accelerator of the component D at the temperature of 100-120 ℃; and then, carrying out gradient curing on the obtained composition within the temperature range of 120-180 ℃ to finally obtain a cured product.

Further, another aspect of the embodiments of the present invention provides a hyperbranched cured epoxy resin prepared by the method, wherein the impact strength of the hyperbranched cured epoxy resin is 30-90 kJ/m²The flame retardant performance is at least V1 grade and above.

The invention also provides application of the hyperbranched epoxy resin modified composition or a cured product of the hyperbranched epoxy resin modified composition in the fields of aerospace and the like.

Further, the use comprises: the hyperbranched epoxy resin modified composition or the hyperbranched epoxy resin cured product is used in an impact-resistant part.

In another aspect of the embodiments of the present invention, there is also provided a device having a high and low temperature impact resistant and heat and flame retardant structure, wherein the high and low temperature impact resistant and heat and flame retardant structure comprises a cured product of the hyperbranched epoxy resin modified composition.

In summary, the hyperbranched epoxy resin modified composition provided by the invention has excellent impact resistance while maintaining excellent flame retardancy of a cured product, is suitable for high-end application fields with high impact resistance and high flame retardancy requirements on polymer materials, and can be applied to the aerospace field as a high-performance special functional epoxy resin.

The technical solutions of the present invention will be described in further detail below with reference to several preferred embodiments and accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. It is to be noted that the following examples are intended to facilitate the understanding of the present invention, and do not set forth any limitation thereto. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out under conventional conditions or conditions recommended by the manufacturers.

In the following examples, the flame retardant properties of the cured products were measured using a vertical burning test apparatus in which V0 was the highest rating in the vertical burning test. The nuclear magnetic data of the biobased A2+ B3 hyperbranched epoxy resin precursor is measured by a 400AVANCE III type Spectrometer (Spectrometer) of Bruker company (Bruker), 400MHz and deuterated chloroform (CDCl)₃) Deuterated dimethyl sulfoxide (DMSO).

Example 1

(1) Dissolving 1 part of vanillin, 1 part of DOPO and 0.03 part of p-toluenesulfonic acid in 4 parts of guaiacol at 130 ℃, and reacting for 12 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 2 parts of bio-based tri-functionality epoxy monomer with a structure shown as formula (III) and 0.03 part of tetrabutylammonium bromide in the presence of tetrahydrofuran, reacting at 80 ℃ for 24 hours under the atmosphere of nitrogen, and then settling and drying to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor, wherein a nuclear magnetic resonance hydrogen spectrogram of the precursor is shown in figure 1.

(3) And (3) mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and bisphenol A diglycidyl ether according to the weight ratio of 3: 7, then mixing the obtained mixture 1 with a curing agent diaminodiphenylmethane according to the ratio of 1 to 1 of epoxy group and amino active hydrogen to obtain a mixture 2, adding 2-methylimidazole accounting for 0.05 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 39.1kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 2

(1) Dissolving 1 part of vanillin, 1 part of DPPA and 0.03 part of p-toluenesulfonic acid in 4 parts of guaiacol at 140 ℃, and reacting for 8 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 2 parts of bio-based tri-functionality epoxy monomer with a structure shown as formula (III) and 0.04 part of benzyltriethylammonium chloride in the presence of dioxane, reacting at 120 ℃ for 6 hours under the atmosphere of nitrogen, and then settling and drying to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor.

(3) Uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and bisphenol A diglycidyl ether according to the mass ratio of 3: 7, then mixing the obtained mixture 1 and a curing agent diaminodiphenylmethane according to the mass ratio of 1 to 0.8 of epoxy groups and amino active hydrogen to obtain a mixture 2, adding dimethylbenzylamine accounting for 0.2 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 35.4kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 3

(1) Dissolving 1 part of o-vanillin, 1 part of DOPO and 0.04 part of trifluoroacetic acid in 12 parts of cardanol at 160 ℃, and reacting for 6 hours at the temperature to obtain a bio-based flame retardant diphenol monomer;

m is 0, 2, 4 or 6

(2) Dissolving 1 part of bio-based flame-retardant diphenol monomer, 2 parts of bio-based tri-functionality epoxy monomer with a structure shown as a formula (III) and 0.05 part of tetradecyl trimethyl ammonium chloride in dimethyl sulfoxide, reacting for 16 hours at 100 ℃ under nitrogen atmosphere, and then settling and drying to obtain a bio-based A2+ B3 hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and bisphenol F diglycidyl ether according to the mass ratio of 3: 7, then mixing the obtained mixture 1 and curing agent p-phenylenediamine according to the mass ratio of 1 to 1 of epoxy groups and amino active hydrogen to obtain a mixture 2, adding zinc acetylacetonate accounting for 0.05 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 81.0kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 4

(1) Dissolving 1 part of ethyl vanillin, 1 part of DOPO and 0.06 part of phosphoric acid in 12 parts of carvacrol at 80 ℃, and reacting for 24 hours at the temperature to obtain a bio-based flame retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 2 parts of bio-based tri-functionality epoxy monomer with a structure shown in formula (III) and 0.06 part of tetradecyl trimethyl ammonium chloride in N, N-dimethylformamide, reacting for 20 hours at 100 ℃ under the atmosphere of nitrogen, and then settling and drying to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

(3) and (3) mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and bisphenol S diglycidyl ether according to the weight ratio of 2: 8, then mixing the obtained mixture 1 with a curing agent biphenyl diamine according to the ratio of 1 to 0.9 of epoxy groups and amino active hydrogen to obtain a mixture 2, adding zinc acetylacetonate accounting for 0.1 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 33.6kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 5

(1) Dissolving 1 part of salicylaldehyde, 1 part of DOPO and 0.05 part of aluminum chloride in 6 parts of thymol at 120 ℃, and reacting for 18 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 3 parts of bio-based tri-functionality epoxy monomer with a structure shown in formula (III) and 0.03 part of tetrabutylammonium hydrogen sulfate in N, N-dimethylacetamide, reacting for 16 hours at 100 ℃ under the atmosphere of nitrogen, and then settling and drying to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and bisphenol S diglycidyl ether according to the mass ratio of 3: 7, then mixing the obtained mixture 1 and curing agent m-phenylenediamine according to the mass ratio of 1 to 1 of epoxy groups and amino active hydrogen to obtain a mixture 2, adding triethanolamine accounting for 0.05 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2h in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 37.1kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 6

(1) Dissolving 1 part of p-hydroxybenzaldehyde, 1 part of DPPA and 0.03 part of sulfuric acid in 12 parts of cardanol at 120 ℃, and reacting for 20 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

m is 0, 2, 4 or 6

(2) Dissolving 1 part of bio-based flame-retardant diphenol monomer, 3 parts of bio-based tri-functionality epoxy monomer with a structure shown in formula (III) and 0.06 part of tetrabutylammonium hydrogen sulfate in dimethyl sulfoxide, reacting at 90 ℃ for 10 hours under nitrogen atmosphere, and then settling and drying to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and cyclohexanedimethanol diglycidyl ether according to the mass ratio of 4: 6, then mixing the obtained mixture 1 and curing agent m-phenylenediamine according to the mass ratio of 1 to 1 of epoxy groups and amino active hydrogen to obtain a mixture 2, adding triethanolamine accounting for 0.2 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2h in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 90.0kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 7

(1) Dissolving 1 part of ethyl vanillin, 1 part of DPPA and 0.03 part of ferric chloride in 5 parts of cardanol at 140 ℃, and reacting for 16 hours at the temperature to obtain a bio-based flame retardant diphenol monomer;

m is 0, 2, 4 or 6

(2) Dissolving 1 part of bio-based flame retardant diphenol monomer, 3 parts of bio-based tri-functionality epoxy monomer with a structure shown as a formula (III) and 0.05 part of tetrabutylammonium iodide in dioxane, reacting at 120 ℃ for 6 hours under nitrogen atmosphere, and then settling and drying to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and cyclohexanedimethanol diglycidyl ether according to the mass ratio of 3: 7, then mixing the obtained mixture 1 and curing agent high phthalic anhydride according to the mass ratio of 1 to 0.75 of epoxy groups and anhydride groups to obtain a mixture 2, adding hexadecyl dimethyl benzyl ammonium accounting for 0.45 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 78.0kJ/m and the flame retardant property of V1 grade, and is suitable for flame retardant and impact resistant applications.

Example 8

(1) Dissolving 1 part of vanillin, 1 part of DPPA and 0.06 part of aminobenzenesulfonic acid in 12 parts of carvacrol at 130 ℃, and reacting for 12 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 10 parts of bio-based tri-functionality epoxy monomer with a structure shown in formula (III) and 0.04 part of trioctylmethylammonium chloride in tetrahydrofuran, reacting at 110 ℃ for 22 hours under nitrogen atmosphere, and then settling and drying to obtain a bio-based A2+ B3 hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and hydroquinone diglycidyl ether according to the mass ratio of 2: 8, then mixing the obtained mixture 1 and a curing agent 1, 2-naphthalic anhydride according to the mass ratio of 1 to 1 of epoxy groups and anhydride groups to obtain a mixture 2, adding boron trifluoride ethylamine accounting for 0.25 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 45.8kJ/m and the flame retardant property of V1 grade, and is suitable for flame retardant and impact resistant applications.

Example 9

(1) Dissolving 1 part of p-hydroxybenzaldehyde, 1 part of DOPO and 0.03 part of sulfuric acid in 6 parts of guaiacol at the temperature of 80 ℃, and reacting for 24 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 5 parts of bio-based tri-functionality epoxy monomer and 0.04 part of tetrabutylammonium chloride in dioxane, reacting at 100 ℃ for 18 hours under nitrogen atmosphere, and then settling and drying to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and bisphenol S diglycidyl ether according to the mass ratio of 4: 10, then mixing the obtained mixture 1 and a curing agent 2, 3-pyrazine diacid anhydride according to the mass ratio of 1 to 0.5 of epoxy groups and anhydride groups to obtain a mixture 2, adding 2-methylimidazole accounting for 0.3 percent of the total mass of the mixture 2 for precuring, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 40.2kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 10

(1) Dissolving 1 part of salicylaldehyde, 1 part of DOPO and 0.03 part of ferric chloride in 10 parts of thymol at 100 ℃, and reacting for 16 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 8 parts of bio-based tri-functionality epoxy monomer with a structure shown in formula (III) and 0.03 part of tetrabutylammonium iodide in N, N-dimethylacetamide, reacting at 90 ℃ for 10 hours under the atmosphere of nitrogen, and then settling and drying to obtain a bio-based A2+ B3 hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and naphthalenediol diglycidyl ether according to the mass ratio of 3: 7, then mixing the obtained mixture 1 and curing agent phthalic anhydride according to the mass ratio of 1 to 1 of epoxy groups and anhydride groups to obtain a mixture 2, adding boron trifluoride amine complex accounting for 0.5 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 48.9kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 11

(1) Dissolving 1 part of vanillin, 1 part of DOPO and 0.03 part of p-toluenesulfonic acid in 3 parts of guaiacol at 130 ℃, and reacting for 12 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 2 parts of bio-based tri-functionality epoxy monomer with a structure shown as formula (III) and 0.03 part of tetrabutylammonium bromide in the presence of tetrahydrofuran, reacting at 80 ℃ for 24 hours under the atmosphere of nitrogen, and then settling and drying to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor.

(3) Uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and 4, 4' -dihydroxy diphenyl sulfide diglycidyl ether according to the mass ratio of 4: 6, then mixing the obtained mixture 1 and a curing agent diaminodiphenyl methane according to the mass ratio of 1 to 0.2 of epoxy groups and amino active hydrogen to obtain a mixture 2, adding 2-methylimidazole accounting for 0.05 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 52.8kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 12

(1) Dissolving 1 part of o-vanillin, 1 part of DOPO and 0.04 part of trifluoroacetic acid in 12 parts of cardanol at 150 ℃, and reacting for 8 hours at the temperature to obtain a bio-based flame retardant diphenol monomer;

m is 0, 2, 4 or 6

(2) Dissolving 1 part of bio-based flame-retardant diphenol monomer, 2 parts of bio-based tri-functionality epoxy monomer with a structure shown as a formula (III) and 0.05 part of tetradecyl trimethyl ammonium chloride in dimethyl sulfoxide, reacting at 120 ℃ for 6 hours under nitrogen atmosphere, and then settling and drying to obtain a bio-based A2+ B3 hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and 4, 4' -dihydroxy diphenyl ether diglycidyl ether according to the mass ratio of 3: 7, then mixing the obtained mixture 1 and curing agent decamethylene diamine according to the mass ratio of 1: 1 of epoxy groups and amino active hydrogen to obtain a mixture 2, adding zinc acetylacetonate accounting for 0.05 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 75.2kJ/m and the flame retardant property of V1 grade, and is suitable for flame retardant and impact resistant applications.

Example 13

(1) Dissolving 1 part of ethyl vanillin, 1 part of DOPO and 0.06 part of phosphoric acid in 12 parts of carvacrol at 130 ℃, and reacting for 12 hours at the temperature to obtain a bio-based flame retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 2 parts of bio-based tri-functionality epoxy monomer with a structure shown in formula (III) and 0.06 part of tetradecyl trimethyl ammonium chloride in N, N-dimethylformamide, reacting at 110 ℃ for 12 hours under the atmosphere of nitrogen, and then settling and drying to obtain a bio-based A2+ B3 type hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and 4, 4' -dihydroxy biphenyl diglycidyl ether according to the mass ratio of 2: 8, then mixing the obtained mixture 1 and curing agent biphenyl diamine according to the mass ratio of 1 to 1 of epoxy groups and amino active hydrogen to obtain a mixture 2, adding zinc acetylacetonate accounting for 0.04 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 35.0kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Example 14

(1) Dissolving 1 part of p-hydroxybenzaldehyde, 1 part of DPPA and 0.03 part of sulfuric acid in 12 parts of cardanol at 120 ℃, and reacting for 20 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

m is 0, 2, 4 or 6

(2) Dissolving 1 part of bio-based flame-retardant diphenol monomer, 3 parts of bio-based tri-functionality epoxy monomer with a structure shown in formula (III) and 0.03 part of tetrabutyl hydrogen sulfate in dimethyl sulfoxide, reacting at 90 ℃ for 18 hours under nitrogen atmosphere, and then settling and drying to obtain a bio-based A2+ B3 hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and 1, 4-diethylcyclohexane dimethanol diglycidyl ether according to the mass ratio of 5: 5, then mixing the obtained mixture 1 and curing agent m-phenylenediamine according to the mass ratio of 1 to 1 of epoxy groups and amino active hydrogen to obtain a mixture 2, adding triethanolamine accounting for 0.2 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 90.0kJ/m and the flame retardant property of V1 grade, and is suitable for flame retardant and impact resistant applications.

Example 15

(1) Dissolving 1 part of vanillin, 1 part of DPPA and 0.06 part of aminobenzenesulfonic acid in 12 parts of carvacrol at 90 ℃, and reacting for 22 hours at the temperature to obtain a bio-based flame-retardant diphenol monomer;

(2) dissolving 1 part of bio-based flame-retardant diphenol monomer, 10 parts of bio-based tri-functionality epoxy monomer with a structure shown as a formula (III) and 0.04 part of benzyl triethyl ammonium bromide in tetrahydrofuran, reacting at 100 ℃ for 22 hours under nitrogen atmosphere, and then settling and drying to obtain a bio-based A2+ B3 hyperbranched epoxy resin precursor;

(3) uniformly mixing the obtained bio-based A2+ B3 type hyperbranched epoxy resin precursor and diglycidyl terephthalate according to the mass ratio of 1: 9, then mixing the obtained mixture 1 and curing agent 1, 2-naphthalic anhydride according to the mass ratio of 1 to 1 of epoxy group and anhydride group to obtain a mixture 2, adding boron trifluoride ethylamine accounting for 0.25 percent of the total mass of the mixture 2 for pre-curing, and finally performing post-curing for 2h in a vacuum oven at the temperature of 180 ℃ to obtain an epoxy resin cured product. The obtained cured product has the impact strength of 53.6kJ/m and the flame retardant property of V0 grade, and is suitable for flame retardant and impact resistant applications.

Comparative example 1

Uniformly mixing bisphenol A diglycidyl ether and diaminodiphenylmethane according to the ratio of 1: 1 of epoxy group and amino active hydrogen, adding 2-methylimidazole accounting for 0.05 percent of the total mass of the mixture for precuring, and finally performing post-curing for 2 hours in a vacuum oven at 180 ℃ to obtain an epoxy resin cured product. The impact strength of the obtained cured product was 19.3kJ/m, and the flame retardant rating was none.

Comparative example 2

This comparative example differs from example 1 in that: steps (1) and (2) were not included and the hyperbranched epoxy precursor in step (3) of example 1 was replaced with DOPO. The product obtained in this comparative example had a flame retardancy of V0 and an impact strength of 20.0kJ/m²。

In addition, the inventors of the present invention have also made experiments with other materials, process operations, and process conditions described in the present specification with reference to the above examples, and have obtained preferable results.

The aspects, embodiments, features and examples of the present invention should be considered as illustrative in all respects and not intended to be limiting of the invention, the scope of which is defined only by the claims. Other embodiments, modifications, and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.

The use of headings and chapters in this disclosure is not meant to limit the disclosure; each section may apply to any aspect, embodiment, or feature of the disclosure.

Throughout this specification, where a composition is described as having, containing, or comprising specific components or where a process is described as having, containing, or comprising specific process steps, it is contemplated that the composition of the present teachings also consist essentially of, or consist of, the recited components, and the process of the present teachings also consist essentially of, or consist of, the recited process steps.

It should be understood that the order of steps or the order in which particular actions are performed is not critical, so long as the teachings of the invention remain operable. Further, two or more steps or actions may be performed simultaneously.

While the invention has been described with reference to illustrative embodiments, it will be understood by those skilled in the art that various other changes, omissions and/or additions may be made and substantial equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims. Moreover, unless specifically stated any use of the terms first, second, etc. do not denote any order or importance, but rather the terms first, second, etc. are used to distinguish one element from another.