阅读说明：本技术 一种木塑增强的仿实木环保型板材及其制备方法 (Wood-plastic reinforced solid wood-imitated environment-friendly plate and preparation method thereof ) 是由 喻国深 于 2021-09-11 设计创作，主要内容包括：本发明公开了一种木塑增强的仿实木环保型板材及其制备方法,该包括如下重量份原料：改性聚苯丙烯100-120份、增韧纤维30-50份、木粉60-80份、碳酸钙10-15份；通过改性聚苯丙烯使得仿实木环保型板材燃烧时表面会形成一层保护膜时,能够隔绝可燃性气体与氧气的扩散,也可以阻止火焰对固相的热辐射而抑制燃烧,同时阻燃成分位于改性聚苯丙烯的侧链,与传统阻燃材料直接添加阻燃剂的方式不同,使得有机阻燃成分不会析出,确保了阻燃效果的持久同时符合环保要求,并通过增韧纤维进一步提升了仿实木环保型板材的机械性能,增加了板材的使用寿命。(The invention discloses a wood-plastic reinforced wood-imitated environment-friendly plate and a preparation method thereof, wherein the wood-plastic reinforced wood-imitated environment-friendly plate comprises the following raw materials in parts by weight: 100-120 parts of modified polyphenyl propylene, 30-50 parts of toughening fiber, 60-80 parts of wood powder and 10-15 parts of calcium carbonate; when making imitative wood environment-friendly panel burning time surface can form the one deck protection film through modified polyphenyl propylene, can completely cut off the diffusion of combustible gas and oxygen, also can prevent flame to the heat radiation of solid phase and restrain the burning, fire-retardant composition is located modified polyphenyl propylene's side chain simultaneously, it is different with the mode that traditional flame retardant material directly added the fire retardant, make organic fire-retardant composition can not appear, it accords with the environmental protection requirement to have guaranteed that flame retardant efficiency's is lasting simultaneously, and the mechanical properties of imitative wood environment-friendly panel has further been promoted through toughening fiber, the life of panel has been increased.)

1. The wood-plastic reinforced wood-imitated environment-friendly board is characterized in that: the feed comprises the following raw materials in parts by weight: 100-120 parts of modified polyphenyl propylene, 30-50 parts of toughening fiber, 60-80 parts of wood powder and 10-15 parts of calcium carbonate;

the modified polypropylene is prepared by the following steps:

step A1: stirring phenyl phosphoryl dichloride, dropwise adding mixed acid, reacting, adding iron powder and acetic acid, continuing to react, and adjusting the pH value of a reaction solution to obtain an intermediate 1;

step A2: dissolving neopentyl glycol in chloroform, dropwise adding phosphorus oxychloride, performing reflux reaction to obtain an intermediate 2, dissolving p-aminophenol in ethanol, adding the intermediate 2, performing reaction to obtain an intermediate 3, uniformly mixing the intermediate 3, sodium hydroxide and tetrahydrofuran, adding the intermediate 1, and performing reaction to obtain an intermediate 4;

step A3: styrene, maleic anhydride, dibenzoyl peroxide and toluene are mixed and reacted to prepare a copolymer, and the intermediate 4, the copolymer, triethylamine and tetrahydrofuran are mixed and reacted to prepare the modified polyphenyl propylene.

2. The wood-plastic reinforced wood-imitated environment-friendly board as claimed in claim 1, wherein: the dosage ratio of the phenylphosphoryl dichloride, the mixed acid, the iron powder and the acetic acid in the step A1 is 5mL to 20mL to 4g to 15 mL.

3. The wood-plastic reinforced wood-imitated environment-friendly board as claimed in claim 1, wherein: the molar ratio of the neopentyl glycol to the phosphorus oxychloride used in the step A2 is 1:1, the molar ratio of the p-aminophenol to the intermediate 2 used is 1:2, and the molar ratio of the intermediate 3 to the sodium hydroxide to the intermediate 1 used is 2:2: 1.

4. The wood-plastic reinforced wood-imitated environment-friendly board as claimed in claim 1, wherein: the mass ratio of the styrene to the maleic anhydride to the dibenzoyl peroxide in the step A3 is 10.5:9.6:0.1, and the mass ratio of the intermediate 4 to the copolymer to the triethylamine is 6:10: 3.5.

5. The wood-plastic reinforced wood-imitated environment-friendly board as claimed in claim 1, wherein: the toughening fiber is prepared by the following steps:

step B1: mixing 3-nitropentane, N-bromosuccinimide, benzoyl peroxide and carbon tetrachloride for reaction to prepare an intermediate 5, mixing 4,4' -dihydroxydiphenylsulfone, the intermediate 5, sodium hydroxide and tetrahydrofuran for reaction, introducing carbon dioxide, and preserving heat to prepare an intermediate 6;

step B2: mixing the intermediate 6, epichlorohydrin and tetrahydrofuran, heating, adding sodium hydroxide, reacting to obtain modified resin, uniformly mixing isophorone diisocyanate and tin laurate, adding polyethylene glycol 200, reacting, adding the modified resin, and heating to react to obtain reinforced resin;

step B3: uniformly mixing the reinforced resin, palladium carbon and N, N-dimethylformamide, introducing hydrogen, reacting, filtering to remove the palladium carbon, adding the carbon oxide nanotube and 1-hydroxybenzotriazole, continuously reacting, adding triethylene tetramine, uniformly mixing, and performing wet spinning to obtain the toughened fiber.

6. The wood-plastic reinforced wood-imitated environment-friendly board as claimed in claim 5, wherein: the dosage ratio of the 3-nitropentane, the N-bromosuccinimide, the benzoyl peroxide and the carbon tetrachloride in the step B1 is 0.01mol:0.01mol:0.05g:20mL, and the dosage molar ratio of the 4,4' -dihydroxydiphenyl sulfone, the intermediate 5 and the sodium hydroxide is 2:1: 2.

7. The wood-plastic reinforced wood-imitated environment-friendly board as claimed in claim 5, wherein: the molar ratio of the intermediate 6, the epichlorohydrin and the sodium hydroxide in the step B2 is 1:2:1.2, and the mass ratio of the isophorone diisocyanate, the tin laurate, the polyethylene glycol 200 and the modified resin is 8.6:5.3:4.7: 11.2.

8. The wood-plastic reinforced wood-imitated environment-friendly board as claimed in claim 5, wherein: the mass ratio of the reinforced resin, the palladium-carbon, the carbon oxide nanotube and the 1-hydroxybenzotriazole in the step B3 is 10:0.5:5: 2.3.

9. The method for preparing the wood-plastic reinforced imitated solid wood environment-friendly board as claimed in claim 5, wherein the method comprises the following steps: the method specifically comprises the following steps:

step S1: weighing raw materials and uniformly mixing to prepare a mixture;

step S2: and melting and extruding the mixture to a die, and cooling and forming to obtain the solid wood-imitated environment-friendly plate.

Technical Field

The invention relates to the field of wood-plastic reinforced solid wood-imitated environment-friendly plates and a preparation method thereof.

Background

The wood-plastic composite board is a high-tech green environment-friendly novel decorative material which is mainly prepared by uniformly mixing wood (wood cellulose and plant cellulose) as a base material, a thermoplastic high polymer material (plastic), a processing aid and the like, and then heating and extruding the mixture by using a die device, has the performance and characteristics of both wood and plastic, and is a novel composite material capable of replacing the wood and the plastic. The wood-plastic composite material is rapidly developed with excellent performance in short decades, and some wood-plastic composite materials prepared by waste fibers such as straws, rice straws, corn stalks and the like appear in recent years.

The existing wood-plastic board has the defects of brittle material texture, insufficient toughness and weak impact resistance, cracks or damages can be caused on the surface due to the external force action of the board in the transportation, assembly and use processes, the normal use of the board is influenced, meanwhile, the board is made of wood and plastic, the self flame retardance is poor, a large amount of smoke and dust can be generated during combustion, and the environment is polluted.

Disclosure of Invention

The invention aims to provide a wood-plastic reinforced solid wood-imitated environment-friendly plate and a preparation method thereof, and solves the problems that the wood-plastic plate at the present stage is poor in mechanical property, easy to damage due to external force and free of flame retardance through modified polyphenyl propylene and toughened fibers.

The purpose of the invention can be realized by the following technical scheme:

a wood-plastic reinforced solid wood-imitated environment-friendly plate comprises the following raw materials in parts by weight: 100-120 parts of modified polyphenyl propylene, 30-50 parts of toughening fiber, 60-80 parts of wood powder and 10-15 parts of calcium carbonate;

the imitated solid wood environment-friendly plate is prepared by the following steps:

step S1: weighing the raw materials and uniformly mixing to prepare a mixture;

step S2: adding the mixture into an extruder, melting and extruding the mixture into a die at the temperature of 170-190 ℃, cooling and forming to obtain the solid wood-imitated environment-friendly plate.

Further, the modified polypropylene is prepared by the following steps:

step A1: adding phenyl phosphoryl dichloride into a reaction kettle, stirring and dropwise adding mixed acid under the conditions that the rotating speed is 150-;

the reaction process is as follows:

step A2: dissolving neopentyl glycol in chloroform, dropwise adding phosphorus oxychloride under the ice-water bath condition, carrying out reflux reaction for 3-5h under the conditions of the rotation speed of 200-300r/min and the temperature of 70-90 ℃, filtering to remove filtrate to obtain an intermediate 2, dissolving p-aminophenol in ethanol, adding the intermediate 2, carrying out reaction for 1-1.5h under the conditions of the rotation speed of 150-200r/min to obtain an intermediate 3, uniformly mixing the intermediate 3, sodium hydroxide and tetrahydrofuran, adding the intermediate 1, and carrying out reaction for 3-5h under the conditions of the rotation speed of 120-150r/min and the temperature of 30-40 ℃ to obtain an intermediate 4;

the reaction process is as follows:

step A3: adding styrene, maleic anhydride, dibenzoyl peroxide and toluene into a reaction kettle, reacting for 1-2h at the rotation speed of 150-200r/min and the temperature of 75-85 ℃ to obtain a copolymer, adding the intermediate 4, the copolymer, triethylamine and tetrahydrofuran into the reaction kettle, and reacting for 20-25h at the temperature of 20-25 ℃ to obtain the modified polyphenyl propylene.

The reaction process is as follows:

further, the dosage ratio of the phenylphosphoryl dichloride, the mixed acid, the iron powder and the acetic acid in the step A1 is 5mL:20mL:4g:15mL, and the mixed acid is concentrated sulfuric acid with the mass fraction of 98% and concentrated nitric acid with the mass fraction of 68% which are mixed according to the volume ratio of 10: 9.

Further, the molar ratio of the neopentyl glycol to the phosphorus oxychloride used in the step A2 is 1:1, the molar ratio of the p-aminophenol to the intermediate 2 used is 1:2, and the molar ratio of the intermediate 3 to the sodium hydroxide to the intermediate 1 used is 2:2: 1.

Further, the mass ratio of the styrene, the maleic anhydride and the dibenzoyl peroxide in the step A3 is 10.5:9.6:0.1, and the mass ratio of the intermediate 4, the copolymer and the triethylamine is 6:10: 3.5.

Further, the toughening fiber is prepared by the following steps:

step B1: adding 3-nitropentane, N-bromosuccinimide, benzoyl peroxide and carbon tetrachloride into a reaction kettle, reacting for 8-10h at the temperature of 80-90 ℃ to obtain an intermediate 5, adding 4,4' -dihydroxy diphenyl sulfone, the intermediate 5, sodium hydroxide and tetrahydrofuran into the reaction kettle, reacting for 5-8h at the rotation speed of 150-200r/min and the temperature of 25-30 ℃, introducing carbon dioxide, and preserving heat for 20-30min to obtain an intermediate 6;

the reaction process is as follows:

step B2: adding the intermediate 6, epichlorohydrin and tetrahydrofuran into a reaction kettle, adding sodium hydroxide at the temperature of 70-80 ℃ to react for 2-4h to obtain modified resin, uniformly mixing isophorone diisocyanate and tin laurate, adding polyethylene glycol 200, reacting for 30-40min at the rotation speed of 200-300r/min and the temperature of 90-95 ℃, adding the modified resin, heating to the temperature of 120-140 ℃, and reacting for 2-4h to obtain reinforced resin;

the reaction process is as follows:

step B3: uniformly mixing the reinforced resin, palladium carbon and N, N-dimethylformamide, introducing hydrogen, reacting for 3-5h at the temperature of 25-30 ℃, filtering to remove the palladium carbon, adding the carbon oxide nanotube and 1-hydroxybenzotriazole, continuously reacting for 10-15h at the temperature of 50-60 ℃, adding triethylene tetramine, uniformly mixing, and performing wet spinning to obtain the toughened fiber.

Furthermore, the using amount ratio of the 3-nitropentane, the N-bromosuccinimide, the benzoyl peroxide and the carbon tetrachloride in the step B1 is 0.01mol:0.01mol:0.05g:20mL, and the using amount molar ratio of the 4,4' -dihydroxy diphenyl sulfone, the intermediate 5 and the sodium hydroxide is 2:1: 2.

Further, the molar ratio of the intermediate 6, the epichlorohydrin and the sodium hydroxide in the step B2 is 1:2:1.2, and the mass ratio of the isophorone diisocyanate, the tin laurate, the polyethylene glycol 200 and the modified resin is 8.6:5.3:4.7: 11.2.

Furthermore, the mass ratio of the reinforced resin, the palladium-carbon, the carbon oxide nanotube and the 1-hydroxybenzotriazole in the step B3 is 10:0.5:5: 2.3.

The invention has the beneficial effects that: the invention prepares modified polyphenyl propylene and toughened fiber in the process of preparing a wood-plastic reinforced wood-imitated environment-friendly plate, the modified polyphenyl propylene is subjected to nitration treatment by taking phenylphosphoryl dichloride as a raw material, then is subjected to reduction to prepare an intermediate 1, neopentyl glycol is reacted with phosphorus oxychloride to prepare an intermediate 2, the intermediate 2 is reacted with p-aminophenol to prepare an intermediate 3, the intermediate 3 is reacted with the intermediate 1 to prepare an intermediate 4, styrene and maleic anhydride are copolymerized to prepare a copolymer, the intermediate 4 is reacted with the copolymer to cause the ammonolysis reaction of the copolymer, the intermediate 4 is grafted on the copolymer to prepare the modified polyphenyl propylene, the problem that the traditional polyphenyl propylene is flammable is solved, when a layer of protective film is formed on the surface of the wood-imitated environment-friendly plate during combustion, the diffusion of flammable gas and oxygen can be isolated, the flame retardant is also prevented from radiating heat of a solid phase to inhibit combustion, meanwhile, the flame retardant component is positioned on a side chain of the modified polyphenyl propylene, and the mode is different from the mode of directly adding a flame retardant into the traditional flame retardant material, so that the organic flame retardant component can not be separated out, less smoke is generated, the durability of the flame retardant effect is ensured, and the environment-friendly requirement is met, the toughening fiber takes 3-nitropentane as a raw material to carry out bromination treatment to prepare an intermediate 5, then the intermediate 5 is reacted with 4,4' -dihydroxy diphenyl sulfone to prepare an intermediate 6, the intermediate 6 is reacted with epoxy chloropropane to prepare modified resin, isophorone diisocyanate is reacted with polyethylene glycol 200 to ensure that the hydroxyl groups at two ends of the polyethylene glycol 200 are reacted with the isocyanate groups of the isophorone diisocyanate, then the modified resin is added to ensure that the residual isocyanate groups are reacted with the active alcoholic hydroxyl groups on the modified resin, forming latticed macromolecules, preparing reinforced resin, reducing the reinforced resin by palladium-carbon to convert nitryl on the reinforced resin into amino, dehydrating and condensing the amino with carboxyl on the surface of an oxidized carbon nano tube under the action of 1-hydroxybenzotriazole, forming latticed package on the surface of the carbon nano tube by the reinforced resin, using triethylene tetramine as a curing agent, performing wet spinning to prepare toughened fiber, coating the surface of the toughened fiber with a layer of reinforced resin, wherein the reinforced resin is epoxy resin, so that the durability of the prepared wood-like environment-friendly board is further improved, the mechanical strength is enhanced, and a side chain contains a toughened soft section matched with the carbon nano tube, so that the toughness of the board is improved, and the board is not easy to damage under the action of external force.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

Example 1

A wood-plastic reinforced solid wood-imitated environment-friendly plate comprises the following raw materials in parts by weight: 100 parts of modified polyphenyl propylene, 30 parts of toughened fiber, 60 parts of wood powder and 10 parts of calcium carbonate;

the imitated solid wood environment-friendly plate is prepared by the following steps:

step S1: weighing the raw materials and uniformly mixing to prepare a mixture;

step S2: adding the mixture into an extruder, melting and extruding the mixture into a die at the temperature of 170 ℃, and cooling and forming to obtain the solid wood-imitated environment-friendly plate.

The modified polypropylene is prepared by the following steps:

step A1: adding phenyl phosphoryl dichloride into a reaction kettle, stirring and dropwise adding mixed acid under the conditions that the rotating speed is 150r/min and the temperature is 50 ℃, reacting for 15min after dropwise adding, adding iron powder and acetic acid, continuously reacting for 1h under the condition that the temperature is 80 ℃, and adjusting the pH value of a reaction solution to be 9 to prepare an intermediate 1;

step A2: dissolving neopentyl glycol in chloroform, dropwise adding phosphorus oxychloride under the ice-water bath condition, performing reflux reaction for 3 hours at the rotation speed of 200r/min and the temperature of 70 ℃, filtering to remove filtrate to obtain an intermediate 2, dissolving p-aminophenol in ethanol, adding the intermediate 2, performing reaction for 1 hour at the rotation speed of 150r/min to obtain an intermediate 3, uniformly mixing the intermediate 3, sodium hydroxide and tetrahydrofuran, adding the intermediate 1, and performing reaction for 3 hours at the rotation speed of 120r/min and the temperature of 30 ℃ to obtain an intermediate 4;

step A3: adding styrene, maleic anhydride, dibenzoyl peroxide and toluene into a reaction kettle, reacting for 1h at the rotation speed of 150r/min and the temperature of 75 ℃ to obtain a copolymer, adding the intermediate 4, the copolymer, triethylamine and tetrahydrofuran into the reaction kettle, and reacting for 20h at the temperature of 20 ℃ to obtain the modified polyphenyl propylene.

The toughening fiber is prepared by the following steps:

step B1: adding 3-nitropentane, N-bromosuccinimide, benzoyl peroxide and carbon tetrachloride into a reaction kettle, reacting for 8 hours at the temperature of 80 ℃ to obtain an intermediate 5, adding 4,4' -dihydroxydiphenylsulfone, the intermediate 5, sodium hydroxide and tetrahydrofuran into the reaction kettle, reacting for 5 hours at the rotation speed of 150r/min and the temperature of 25 ℃, introducing carbon dioxide, and preserving heat for 20 minutes to obtain an intermediate 6;

step B2: adding the intermediate 6, epichlorohydrin and tetrahydrofuran into a reaction kettle, adding sodium hydroxide at the temperature of 70 ℃ to perform reaction for 2 hours to obtain modified resin, uniformly mixing isophorone diisocyanate and tin laurate, adding polyethylene glycol 200, performing reaction for 30 minutes at the rotation speed of 200r/min and the temperature of 90 ℃, adding the modified resin, heating to 120 ℃, and performing reaction for 2 hours to obtain reinforced resin;

step B3: uniformly mixing the reinforced resin, palladium carbon and N, N-dimethylformamide, introducing hydrogen, reacting for 3 hours at the temperature of 25 ℃, filtering to remove the palladium carbon, adding an oxidized carbon nanotube and 1-hydroxybenzotriazole, continuously reacting for 10 hours at the temperature of 50 ℃, adding triethylene tetramine, uniformly mixing, and performing wet spinning to obtain the toughened fiber.

Example 2

A wood-plastic reinforced solid wood-imitated environment-friendly plate comprises the following raw materials in parts by weight: 110 parts of modified polyphenyl propylene, 40 parts of toughened fiber, 70 parts of wood powder and 13 parts of calcium carbonate;

the imitated solid wood environment-friendly plate is prepared by the following steps:

step S1: weighing the raw materials and uniformly mixing to prepare a mixture;

step S2: adding the mixture into an extruder, melting and extruding the mixture into a die at the temperature of 180 ℃, and cooling and forming to obtain the solid wood-imitated environment-friendly plate.

The modified polypropylene is prepared by the following steps:

step A1: adding phenyl phosphoryl dichloride into a reaction kettle, stirring and dropwise adding mixed acid under the conditions that the rotating speed is 180r/min and the temperature is 53 ℃, reacting for 20min after dropwise adding, adding iron powder and acetic acid, continuously reacting for 1.3h under the condition that the temperature is 85 ℃, and adjusting the pH value of a reaction solution to be 10 to prepare an intermediate 1;

step A2: dissolving neopentyl glycol in chloroform, dropwise adding phosphorus oxychloride under the ice-water bath condition, performing reflux reaction for 4 hours at the rotation speed of 300r/min and the temperature of 80 ℃, filtering to remove filtrate to obtain an intermediate 2, dissolving p-aminophenol in ethanol, adding the intermediate 2, performing reaction for 1.3 hours at the rotation speed of 180r/min to obtain an intermediate 3, uniformly mixing the intermediate 3, sodium hydroxide and tetrahydrofuran, adding the intermediate 1, and performing reaction for 4 hours at the rotation speed of 150r/min and the temperature of 35 ℃ to obtain an intermediate 4;

step A3: adding styrene, maleic anhydride, dibenzoyl peroxide and toluene into a reaction kettle, reacting for 1.5h at the rotation speed of 180r/min and the temperature of 80 ℃ to obtain a copolymer, adding the intermediate 4, the copolymer, triethylamine and tetrahydrofuran into the reaction kettle, and reacting for 23h at the temperature of 23 ℃ to obtain the modified polyphenyl propylene.

The toughening fiber is prepared by the following steps:

step B1: adding 3-nitropentane, N-bromosuccinimide, benzoyl peroxide and carbon tetrachloride into a reaction kettle, reacting for 9 hours at the temperature of 85 ℃ to obtain an intermediate 5, adding 4,4' -dihydroxydiphenylsulfone, the intermediate 5, sodium hydroxide and tetrahydrofuran into the reaction kettle, reacting for 6 hours at the rotation speed of 180r/min and the temperature of 28 ℃, introducing carbon dioxide, and preserving heat for 25 minutes to obtain an intermediate 6;

step B2: adding the intermediate 6, epichlorohydrin and tetrahydrofuran into a reaction kettle, adding sodium hydroxide at the temperature of 75 ℃ to react for 3h to obtain modified resin, uniformly mixing isophorone diisocyanate and tin laurate, adding polyethylene glycol 200, reacting for 35min at the rotation speed of 300r/min and the temperature of 93 ℃, adding the modified resin, heating to the temperature of 130 ℃, and reacting for 3h to obtain reinforced resin;

step B3: uniformly mixing the reinforced resin, palladium carbon and N, N-dimethylformamide, introducing hydrogen, reacting for 4 hours at the temperature of 28 ℃, filtering to remove the palladium carbon, adding an oxidized carbon nanotube and 1-hydroxybenzotriazole, continuously reacting for 13 hours at the temperature of 55 ℃, adding triethylene tetramine, uniformly mixing, and performing wet spinning to obtain the toughened fiber.

Example 3

A wood-plastic reinforced solid wood-imitated environment-friendly plate comprises the following raw materials in parts by weight: 120 parts of modified polyphenyl propylene, 50 parts of toughened fiber, 80 parts of wood powder and 15 parts of calcium carbonate;

the imitated solid wood environment-friendly plate is prepared by the following steps:

step S1: weighing the raw materials and uniformly mixing to prepare a mixture;

step S2: and adding the mixture into an extruder, melting and extruding the mixture into a die at the temperature of 190 ℃, and cooling and forming to obtain the solid wood-imitated environment-friendly plate.

The modified polypropylene is prepared by the following steps:

step A1: adding phenyl phosphoryl dichloride into a reaction kettle, stirring and dropwise adding mixed acid under the conditions that the rotating speed is 200r/min and the temperature is 55 ℃, reacting for 30min after dropwise adding, adding iron powder and acetic acid, continuously reacting for 1.5h under the condition that the temperature is 90 ℃, and adjusting the pH value of a reaction solution to be 10 to prepare an intermediate 1;

step A2: dissolving neopentyl glycol in chloroform, dropwise adding phosphorus oxychloride under the ice-water bath condition, carrying out reflux reaction for 5 hours at the rotation speed of 300r/min and the temperature of 90 ℃, filtering to remove filtrate to obtain an intermediate 2, dissolving p-aminophenol in ethanol, adding the intermediate 2, carrying out reaction for 1.5 hours at the rotation speed of 200r/min to obtain an intermediate 3, uniformly mixing the intermediate 3, sodium hydroxide and tetrahydrofuran, adding the intermediate 1, and carrying out reaction for 5 hours at the rotation speed of 150r/min and the temperature of 40 ℃ to obtain an intermediate 4;

step A3: adding styrene, maleic anhydride, dibenzoyl peroxide and toluene into a reaction kettle, reacting for 2 hours at the rotating speed of 200r/min and the temperature of 85 ℃ to obtain a copolymer, adding the intermediate 4, the copolymer, triethylamine and tetrahydrofuran into the reaction kettle, and reacting for 25 hours at the temperature of 25 ℃ to obtain the modified polyphenyl propylene.

The toughening fiber is prepared by the following steps:

step B1: adding 3-nitropentane, N-bromosuccinimide, benzoyl peroxide and carbon tetrachloride into a reaction kettle, reacting for 10 hours at the temperature of 90 ℃ to obtain an intermediate 5, adding 4,4' -dihydroxydiphenylsulfone, the intermediate 5, sodium hydroxide and tetrahydrofuran into the reaction kettle, reacting for 8 hours at the rotation speed of 200r/min and the temperature of 30 ℃, introducing carbon dioxide, and preserving heat for 30 minutes to obtain an intermediate 6;

step B2: adding the intermediate 6, epichlorohydrin and tetrahydrofuran into a reaction kettle, adding sodium hydroxide at the temperature of 80 ℃ to react for 4 hours to obtain modified resin, uniformly mixing isophorone diisocyanate and tin laurate, adding polyethylene glycol 200, reacting for 40 minutes at the rotation speed of 300r/min and the temperature of 95 ℃, adding the modified resin, heating to the temperature of 140 ℃, and reacting for 4 hours to obtain reinforced resin;

step B3: uniformly mixing the reinforced resin, palladium carbon and N, N-dimethylformamide, introducing hydrogen, reacting for 5 hours at the temperature of 30 ℃, filtering to remove the palladium carbon, adding an oxidized carbon nanotube and 1-hydroxybenzotriazole, continuously reacting for 15 hours at the temperature of 60 ℃, adding triethylene tetramine, uniformly mixing, and performing wet spinning to obtain the toughened fiber.

Comparative example 1

This comparative example compared with example 1, in which modified polyphenylene propylene was replaced with polyphenylene propylene and triphenyl phosphate was added to the starting material, the rest of the procedure was the same.

Comparative example 2

Compared with the embodiment 1, the comparative example uses the nano carbon fiber to replace the toughening fiber, and the rest steps are the same.

Comparative example 3

The comparative example is a wood-plastic board disclosed in Chinese patent CN 110183793A.

The plates prepared in examples 1-3 and comparative examples 1-3 were tested for impact strength according to the GB/T1843-2008 standard, for bending strength according to the GB/T1041-2008 standard, for compression strength according to the GB/T9341-2008 standard, and for flame retardant strength according to the GB/T20284-2006 standard, with the results shown in the following table;

from the above table, it can be seen that the impact strength of the solid wood-like environment-friendly board prepared in the embodiments 1 to 3 is 52.79 to 53.12KJ/m2, the bending strength is 47.78 to 48.32MPa, the compression strength is 50.88 to 51.62MPa, the vertical combustion level is V0, and the smoke generation rate is 0.15 to 0.18m2/s2, which indicates that the wood-like environment-friendly board has good mechanical properties, is not easy to be damaged by external force, has good flame retardant effect, can be quickly extinguished during combustion, generates less smoke, and meets the requirement of environmental protection.

The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.