阅读说明：本技术 一种无溶剂重防腐涂料及制备工艺 (Solvent-free heavy-duty anticorrosive paint and preparation process thereof ) 是由 张全章 于 2021-08-04 设计创作，主要内容包括：本发明涉及防腐涂料技术领域,尤其是涉及一种无溶剂重防腐涂料及制备工艺。该涂料一种无溶剂防腐涂料,包含A组份和B组份,A组份：低粘度环氧树脂20.0～55.0%,玄武岩纤维10～15％,玄武岩鳞片4%～10%,活性稀释剂2.0～4.0%,防沉增稠剂1.0～1.5%,消泡剂0.2～0.5%,分散剂0.6～0.8%,石墨2.0～6.0%,二硫化钼0.5～2.0%,滑石粉1.2～12.8%,磷铁粉1%～35%,铝片1.5%～10%,硫酸钡1%～3%,石墨烯水溶胶1.0～3.5%,纳米复合溶胶1～3%,正磷酸铝锌水合物1.0～2.0%,B组份：曼希尼碱固化剂10%～30%,触变增稠剂1.0～2.0%；A组份与B组份按质量比A:B=4～6:1配合使用。该涂料为无溶剂防腐涂料,具有更好的耐候性、耐酸碱性、耐磨性。(The invention relates to the technical field of anticorrosive coatings, in particular to a solvent-free heavy-duty anticorrosive coating and a preparation process thereof. The solvent-free anticorrosive paint comprises a component A and a component B, wherein the component A comprises the following components: 20.0-55.0% of low-viscosity epoxy resin, 10-15% of basalt fiber, 4-10% of basalt flake, 2.0-4.0% of active diluent, 1.0-1.5% of anti-settling thickening agent, 0.2-0.5% of defoaming agent, 0.6-0.8% of dispersing agent, 2.0-6.0% of graphite, 0.5-2.0% of molybdenum disulfide, 1.2-12.8% of talcum powder, 1-35% of ferrophosphorus powder, 1.5-10% of aluminum sheet, 1-3% of barium sulfate, 1.0-3.5% of graphene hydrosol, 1-3% of nano composite sol, 1.0-2.0% of zinc aluminum orthophosphate hydrate, and the component B: 10-30% of a Mannich base curing agent and 1.0-2.0% of a thixotropic thickening agent; the component A and the component B are used in a matching mode according to the mass ratio of A: B = 4-6: 1. The paint is a solvent-free anticorrosive paint and has better weather resistance, acid and alkali resistance and wear resistance.)

1. A solvent-free anticorrosive paint is characterized by comprising a component A and a component B; the solvent-free anticorrosive paint comprises the following raw materials in percentage by mass:

the component A comprises:

20.0-55.0% of low-viscosity epoxy resin;

5-15% of basalt fibers;

4 to 10 percent of basalt flakes

2.0-4.0% of reactive diluent;

1.0-1.5% of an anti-settling thickening agent;

0.2-0.5% of defoaming agent;

0.6-0.8% of a dispersant;

2.0-6.0% of graphite;

0.5-2.0% of molybdenum disulfide;

1.2-12.8% of talcum powder;

1 to 35 percent of ferrophosphorus powder;

1.5 to 10 percent of aluminum sheet;

1-3% of barium sulfate;

1.0-3.5% of graphene hydrosol;

1-3% of nano composite sol

1.0-2.0% of zinc aluminum orthophosphate hydrate;

the component B comprises:

10-20.0% of an epoxy resin curing agent;

10 to 30 percent of manschini base curing agent

1.0-2.0% of thixotropic thickening agent;

the component A and the component B are used in a matching mode according to the mass ratio of A: B = 4-6: 1.

2. The solvent-free heavy-duty anticorrosive coating according to claim 1, wherein the low-viscosity epoxy resin is one or more of bisphenol a, bisphenol F, polyphenol type glycidyl ether epoxy resin, and aliphatic glycidyl ether epoxy resin; the viscosity is controlled in the following way: 50 to 2500 mPa.s.

3. The solvent-free heavy-duty anticorrosive coating according to claim 1, characterized in that the basalt flakes are 100-1000 mesh, and have a thickness of 1-10 μm; the diameter of the fibrous basalt is less than 20 μm, and the length-diameter ratio is more than 10.

4. The solvent-free heavy-duty coating of claim 1, wherein said reactive diluent is one or more of propenyl glycidyl ether, phenyl glycidyl ether, benzyl glycidyl ether, ethylene glycol diglycidyl ether, 1, 4-butanediol diglycidyl ether, 1, 6-hexanediol diglycidyl ether, or resorcinol diglycidyl ether.

5. The solvent-free heavy-duty anticorrosive coating according to claim 1, wherein the dispersant is one or more of a fatty acid dispersant, a fatty amide dispersant and an ester dispersant.

6. The solvent-free nano anticorrosive paint according to claim 1, wherein the nano composite sol is carbon nanotubes and nano titanium dioxide, the mixing mass ratio of the carbon nanotubes to the nano titanium dioxide is 3-5: 1-2, and the particle size of the carbon nanotubes to the nano titanium dioxide is 40-100 nm.

7. The solvent-free heavy-duty anticorrosive paint of claim 1, wherein the manschini base curing agent is synthesized from cardanol, m-xylylenediamine and paraformaldehyde according to a molar ratio of 3: 1 to 1.5: 0.9 to 1.2.

8. The solvent-free heavy-duty paint as claimed in claim 1, wherein said thixotropic thickener is fumed silica.

9. The preparation method of the solvent-free heavy-duty anticorrosive coating according to any one of claims 1 to 8, characterized by comprising the following steps: step A: preparing materials: the component A comprises: 20.0-55.0% of low-viscosity epoxy resin, 5-15% of basalt fiber, 4-10% of basalt flake, 2.0-4.0% of active diluent, 1.0-1.5% of anti-settling thickening agent, 0.2-0.5% of defoaming agent, 0.6-0.8% of dispersing agent, 2.0-6.0% of graphite, 0.5-2.0% of molybdenum disulfide, 1.2-12.8% of talcum powder, 1-35% of ferrophosphorus powder, 1.5-10% of aluminum sheet, 1-3% of barium sulfate, 1.0-3.5% of graphene hydrosol, 1-3% of nano composite sol, 1.0-2.0% of zinc aluminum orthophosphate hydrate, and the component B: 10.0-20.0% of epoxy resin curing agent, 10-30% of manschin base curing agent and 1.0-2.0% of thixotropic thickening agent;

the component A and the component B are used in a matching manner according to the mass ratio of A: B = 4-6: 1;

and B: preparing nano composite sol: dispersing lignosulfonate in deionized water, adding saccharifying enzyme, and performing ultrasonic treatment for 0.5-1 h to obtain activated lignosulfonate solution; dispersing tetrabutyl titanate in a pentaerythritol solution, adding an activated lignosulfonate solution, uniformly stirring, gradually adding an aminosilane coupling agent, adding ammonia water to adjust the pH value of the system to be alkaline, stirring and reacting at 50-80 ℃ for 1-3 h, then adding 2-hydroxy-4-n-octoxy benzophenone, and stirring and reacting for 0.5-2 h to obtain a modified nano composite sol; and C: preparing graphene hydrosol: dispersing graphene oxide and melamine in a glycerol aqueous solution, stirring and reacting at 40-50 ℃ for 12-24 h, cooling to room temperature, adding cysteine, stirring and reacting for 3-5 h, adding aluminum chloride, and uniformly stirring to obtain a modified graphene oxide hydrosol; step D: mixing materials: adding the prepared nano composite sol, active diluent and dispersing agent into low-viscosity epoxy resin, and stirring at the speed of 300-1000 rpm for 20-60 minutes to obtain a mixed solution; step E: adding auxiliary materials: adding basalt flakes, basalt fibers, ferrophosphorus powder, aluminum sheets and barium sulfate into the mixed solution obtained in the step (D), and stirring at the speed of 1400-1500 rpm for 20-60 minutes, wherein the step (F) is as follows: coating component A: gradually dropwise adding graphene hydrosol, stirring and dispersing for 15-30 min, adding a rheological additive, and stirring for 40min at 2500rpm to obtain a solvent-free anticorrosive coating component A; step H: a coating component B: under the action of a thixotropic thickener, a Mannich base curing agent is mixed with an epoxy resin curing agent tetraethylenetriamine to prepare a solvent-free anticorrosive paint component B; step I: and (3) finished product: and mixing the component A and the component B according to a ratio of 4-6: 1, and stirring at a speed of 300-1000 rpm for 10-20 minutes to obtain the solvent-free heavy-duty anticorrosive coating.

Technical Field

The invention relates to the technical field of anticorrosive coatings, in particular to a solvent-free heavy-duty anticorrosive coating and a preparation process thereof.

Background

The existing glass flake anticorrosive paint has high content of alkaline oxide silicon dioxide in glass flakes, the defects of insufficient acid and alkali resistance, poor weather resistance, insufficient wear resistance and the like of the paint cause short protection time of a coating on a metal substrate, and the expected effect cannot be achieved. On the other hand, the bond energy (344.4kJ/mol) of the molecular main chain C-C bond of the traditional coating resin is obviously less than the bond energy (422.5kJ/mol) of the molecular main chain Si-O bond of the organic silicon polymer, so that the service life of the traditional coating is objectively shorter than that of the organic silicon anticorrosive coating, the bond energy of the molecular main chain of the film-forming resin is lower, and the traditional coating is easily damaged by active substances in the environment, such as: ultraviolet rays, active hydrogen, and the like. The volatilization of the solvent also threatens the health of constructors and brings harm to the environment; the development of solvent coatings is also limited by national relevant policies, heavy metals, phosphorus and the like contained in the added antirust agent are easy to cause heavy metal pollution and water eutrophication, the anticorrosion performance is gradually weakened or even disappeared along with the influence of the environment and the lapse of time, and the coating capability of the antirust agent on steel with rusted surfaces is poor; the volatile organic compounds are easy to release to cause environmental pollution; the steel structure needs to be subjected to strict surface treatment before being coated, so that the consumption of manpower and material resources is increased. The anticorrosive paint has the problems of inflammable, explosive and toxic organic solvent escaping of the coating, complex production process, great harm to human body and environment, and great production safety risk. With the enhancement of environmental awareness of people, organic anticorrosive coatings are gradually eliminated and replaced by novel green solvent-free anticorrosive coatings.

The anti-corrosion effect of the solvent-free heavy-duty anticorrosive coating in the current market is still required to be further improved, the adhesion force between the coating and a base material is poor, and the coating is not beneficial to playing a long-acting protection role in a severe environment of ocean engineering equipment.

Disclosure of Invention

In order to solve the problems, the invention provides a solvent-free heavy-duty anticorrosive coating and a preparation process thereof, wherein the coating contains the silicon dioxide content of basalt flakes; the basalt fiber has high content of ferric oxide and ferrous oxide and excellent mechanical property; and the graphene hydrosol and the nano composite sol are added into the coating, so that the coating has better weather resistance, acid and alkali resistance and wear resistance than common anticorrosive coatings.

A solvent-free anticorrosive paint comprises a component A and a component B, wherein the component A comprises 20.0-55.0% of low-viscosity epoxy resin; 5-15% of basalt fibers; 4-10% of basalt flakes and 2.0-4.0% of active diluent; 1.0-1.5% of an anti-settling thickening agent;

0.2-0.5% of defoaming agent; 0.6-0.8% of a dispersant; 2.0-6.0% of graphite; 0.5-2.0% of molybdenum disulfide; 1.2-12.8% of talcum powder; 1 to 35 percent of ferrophosphorus powder; 1.5 to 10 percent of aluminum sheet; 1-3% of barium sulfate; 1.0-3.5% of graphene hydrosol; 1-3% of nano composite sol; 1.0-2.0% of zinc aluminum orthophosphate hydrate; the component B comprises: 12.0-20.0% of epoxy resin curing agent; 25 to 30 percent of manschini base curing agent; 1.0-2.0% of thixotropic thickening agent; the component A and the component B are used in a matching mode according to the mass ratio of A: B = 4-6: 1.

The low-viscosity epoxy resin is one or more of bisphenol A, bisphenol F, polyphenol type glycidyl ether epoxy resin and aliphatic glycidyl ether epoxy resin; the viscosity is controlled in the following way: 50 to 2500 mPa.s.

The scale of the flaky basalt is 100-1000 meshes, and the thickness of the flaky basalt is 1-10 mu m; the diameter of the fibrous basalt is less than 20 μm, and the length-diameter ratio is more than 10.

The reactive diluent is one or more of propenyl glycidyl ether, phenyl glycidyl ether, benzyl glycidyl ether, ethylene glycol diglycidyl ether, 1, 4-butanediol diglycidyl ether, 1, 6-hexanediol diglycidyl ether or resorcinol diglycidyl ether.

The dispersing agent is one or more of fatty acid dispersing agent, fatty amide dispersing agent and ester dispersing agent.

The nano composite sol is a carbon nano tube and nano titanium dioxide, the mixing mass ratio of the carbon nano tube to the nano titanium dioxide is 3-5: 1-2, and the particle size of the carbon nano tube and the nano titanium dioxide is 40-100 nm.

The Mannich base curing agent is synthesized by cardanol, m-xylylenediamine and paraformaldehyde according to the molar ratio of 3: 1-1.5: 0.9-1.2.

The thixotropic auxiliary agent is fumed silica.

A preparation method of a solvent-free heavy-duty anticorrosive paint comprises the following steps:

(1) step A: preparing materials: the component A comprises: 20.0-55.0% of low-viscosity epoxy resin, 5-15% of basalt fiber, 4-10% of basalt flake, 2.0-4.0% of active diluent, 1.0-1.5% of anti-settling thickening agent, 0.2-0.5% of defoaming agent, 0.6-0.8% of dispersing agent, 2.0-6.0% of graphite, 0.5-2.0% of molybdenum disulfide, 1.2-12.8% of talcum powder, 1-35% of ferrophosphorus powder, 1.5-10% of aluminum sheet, 1-3% of barium sulfate, 1.0-3.5% of graphene hydrosol, 1-3% of nano composite sol, 1.0-2.0% of zinc aluminum orthophosphate hydrate, and the component B: 10.0-20.0% of epoxy resin curing agent, 10-30% of manschin base curing agent and 1.0-2.0% of thixotropic thickening agent; . The component A and the component B are used in a matching mode according to the mass ratio of A: B = 4-6: 1.

(2) And B: preparing nano composite sol: dispersing lignosulfonate in deionized water, adding saccharifying enzyme, and performing ultrasonic treatment for 0.5-1 h to obtain activated lignosulfonate solution; dispersing tetrabutyl titanate in a pentaerythritol solution, adding an activated lignosulfonate solution into the pentaerythritol solution, uniformly stirring, gradually adding an aminosilane coupling agent, adding ammonia water to adjust the pH value of the system to be alkaline, stirring and reacting at 50-80 ℃ for 1-3 h, then adding 2-hydroxy-4-n-octoxy benzophenone, and stirring and reacting for 0.5-2 h to obtain the modified nano composite sol.

(3) And C: preparing graphene hydrosol: dispersing graphene oxide and melamine in a glycerol aqueous solution, stirring and reacting at 40-50 ℃ for 12-24 h, cooling to room temperature, adding cysteine, stirring and reacting for 3-5 h, adding aluminum chloride, and uniformly stirring to obtain a modified graphene oxide hydrosol;

(4) step D: mixing materials: adding the prepared nano composite sol, active diluent and dispersing agent into low-viscosity epoxy resin, and stirring at the speed of 300-1000 rpm for 20-60 minutes to obtain a mixed solution;

(5) step E: adding auxiliary materials: adding basalt flakes, basalt fibers, ferrophosphorus powder, aluminum sheets and barium sulfate into the mixed solution obtained in the step (D), and stirring at the speed of 1400-1500 rpm for 20-60 minutes;

(6) step F: coating component A: gradually dropwise adding graphene hydrosol, stirring and dispersing for 15-30 min, adding a rheological additive, and stirring for 40min at 2500rpm to obtain a solvent-free anticorrosive coating component A;

(7) step H: a coating component B: under the action of a thixotropic thickener, a Mannich base curing agent is mixed with an epoxy resin curing agent tetraethylenetriamine to prepare a solvent-free anticorrosive paint component B;

(8) step I: and (3) finished product: and mixing the component A and the component B according to a ratio of 4-6: 1, and stirring at a speed of 300-1000 rpm for 10-20 minutes to obtain the solvent-free heavy-duty anticorrosive coating.

Compared with the prior art, the invention has the following advantages:

(1) compared with the glass flakes, the basalt flakes have higher contents of iron oxide, titanium dioxide, aluminum oxide and calcium oxide; the basalt fiber contains high content of ferric oxide and ferrous oxide, has excellent mechanical properties such as high tensile strength, high elastic modulus, creep resistance and the like, and reduces the corrosion rate, so that the basalt flakes and the basalt fiber have better weather resistance, acid and alkali resistance and wear resistance, and the corrosion resistance is enhanced;

(2) the graphene hydrosol has hydrophobic and oleophobic properties, and the lamellar structure of the graphene hydrosol has a labyrinth effect, so that the permeation of water, corrosive ions and the like to a metal base material can be blocked, the corrosion speed of the metal base material is delayed, the substrate is further subjected to an anti-corrosion effect, the anti-corrosion performance of the coating is greatly improved, and meanwhile, the coating has outstanding green environmental protection performance.

(3) The coating disclosed by the invention is a solvent-free coating, so that the integrity, construction safety and economy of the coating are improved in the coating preparation process, and the policy development trend is met.

Detailed Description

The following are specific examples of the present invention, and the technical solutions of the present invention will be described in detail, but the present invention is not limited to the following examples; the chemical reagents mentioned in the examples are all commercially available chemical reagents, and special chemical reagents are specially described; the use of the products such as the active diluent, the dispersing agent and the like can be blended according to the industry knowledge by coating industry engineers, the products are also products sold in the market, and the coating engineers can solve the problem according to the professional knowledge. The invention provides a new technical scheme, and the synthesis steps and the main components and contents are all within the protection scope of the invention.

Example 1

(1) Preparing materials: see Table 1

TABLE 1

(2) And B: preparing nano composite sol: dispersing lignosulfonate in deionized water, adding saccharifying enzyme, and performing ultrasonic treatment for 0.5-1 h to obtain activated lignosulfonate solution; dispersing tetrabutyl titanate in a pentaerythritol solution, adding an activated lignosulfonate solution into the pentaerythritol solution, uniformly stirring, gradually adding an aminosilane coupling agent, adding ammonia water to adjust the pH value of the system to be alkaline, stirring and reacting at 50-80 ℃ for 1-3 h, then adding 2-hydroxy-4-n-octoxy benzophenone, and stirring and reacting for 0.5-2 h to obtain a modified nano composite sol;

(3) and C: preparing graphene hydrosol: dispersing graphene oxide and melamine in a glycerol aqueous solution, stirring and reacting at 40-50 ℃ for 12-24 h, cooling to room temperature, adding cysteine, stirring and reacting for 3-5 h, adding aluminum chloride, and uniformly stirring to obtain a modified graphene oxide hydrosol;

(4) step D: mixing materials: adding the prepared nano composite sol, active diluent and dispersing agent into low-viscosity epoxy resin, and stirring at the speed of 300-1000 rpm for 20-60 minutes to obtain a mixed solution;

(5) step E: adding auxiliary materials: adding basalt flakes, basalt fibers, ferrophosphorus powder, aluminum sheets and barium sulfate into the mixed solution obtained in the step (D), and stirring at the speed of 1400-1500 rpm for 20-60 minutes;

(6) step F: coating component A: gradually dropwise adding the modified graphene oxide hydrosol, stirring and dispersing for 15-30 min, adding the rheological additive, and stirring for 40min at 2500rpm to obtain a solvent-free anticorrosive coating component A;

(7) step H: a coating component B: under the action of a thixotropic thickener, a Mannich base curing agent is mixed with an epoxy resin curing agent tetraethylenetriamine to prepare a solvent-free anticorrosive paint component B;

(8) step I: and (3) finished product: and mixing the component A and the component B according to a ratio of 4-6: 1, and stirring at a speed of 300-1000 rpm for 10-20 minutes to obtain the solvent-free heavy-duty anticorrosive coating.

The main performance test results are shown in table 2 below.

Water resistance	Salt water resistance	Acid resistance	Alkali resistance	Salt spray resistance h
					90d bubbling 1	Bubbling for 90d for 3	90d bubbling 4	90d bubbling 4	800

TABLE 2

The resin coating with a heavy anti-corrosion effect is obtained by combining bisphenol A type epoxy resin, bisphenol F type epoxy resin, a reactive diluent, a thixotropic agent, basalt fiber, other functional additives and a filler in a proper proportion, and the resin coating has a reinforcing effect on the inner wall of an old pipeline and improves the conveying safety, for example, the bisphenol A type epoxy resin, the bisphenol F type epoxy resin and a reactive toughener need to be matched for use, the mass of the reactive toughener accounts for 25-30% of that of the bisphenol A type epoxy resin, the addition amount in the range can not only obviously improve the toughness of a coating, but also ensure that the strength of the coating is not lost; the bisphenol F epoxy resin has low viscosity and good impregnability to fibers, and is beneficial to adjusting the viscosity of a system and enhancing the dispersion of basalt fibers; the coating can be constructed and brushed for a long time at the temperature of 0-40 ℃, does not need heating, is cured at normal temperature, and can effectively reduce the process difficulty, thereby greatly reducing the process cost.

Example 2

(1) Preparing materials: see Table 3

TABLE 3

(2) And B: preparing nano composite sol: dispersing lignosulfonate in deionized water, adding saccharifying enzyme, and performing ultrasonic treatment for 0.5-1 h to obtain activated lignosulfonate solution; dispersing tetrabutyl titanate in a pentaerythritol solution, adding an activated lignosulfonate solution into the pentaerythritol solution, uniformly stirring, gradually adding an aminosilane coupling agent, adding ammonia water to adjust the pH value of the system to be alkaline, stirring and reacting at 50-80 ℃ for 1-3 h, then adding 2-hydroxy-4-n-octoxy benzophenone, and stirring and reacting for 0.5-2 h to obtain a modified nano composite sol;

(3) and C: preparing graphene hydrosol: dispersing graphene oxide and melamine in a glycerol aqueous solution, stirring and reacting at 40-50 ℃ for 12-24 h, cooling to room temperature, adding cysteine, stirring and reacting for 3-5 h, adding aluminum chloride, and uniformly stirring to obtain a modified graphene oxide hydrosol;

(4) step D: mixing materials: adding the prepared nano composite sol, active diluent and dispersing agent into low-viscosity epoxy resin, and stirring at the speed of 300-1000 rpm for 20-60 minutes to obtain a mixed solution;

(5) step E: adding auxiliary materials: adding basalt flakes, basalt fibers, ferrophosphorus powder, aluminum sheets and barium sulfate into the mixed solution obtained in the step (D), and stirring at the speed of 1400-1500 rpm for 20-60 minutes;

(6) step F: coating component A: gradually dropwise adding the modified graphene oxide hydrosol, stirring and dispersing for 15-30 min, adding the rheological additive, and stirring for 40min at 2500rpm to obtain a solvent-free anticorrosive coating component A;

(7) step H: a coating component B: under the action of a thixotropic thickener, a Mannich base curing agent is mixed with an epoxy resin curing agent tetraethylenetriamine to prepare a solvent-free anticorrosive paint component B;

(8) step I: and (3) finished product: and mixing the component A and the component B according to a ratio of 4-6: 1, and stirring at a speed of 300-1000 rpm for 10-20 minutes to obtain the solvent-free heavy-duty anticorrosive coating.

The main performance test results are shown in table 4 below.

Performance parameter	Example 1	Example 2	EXAMPLE 3
				Appearance of the product	Qualified	Qualified	Qualified
Shelf life	Qualified	Qualified	Qualified
				Thickness of	200 micron	200 micron	200 micron
Adhesion (Steel plate)	Greater than 25	Greater than 25	Greater than 25
				VOC	Does not contain	Does not contain	Does not contain
Hardness (H)	6H	6H	6H
				Alcohol resistance	Qualified	Qualified	Qualified
Gasoline resistant	Qualified	Qualified	Qualified
				Salt spray resistance of 3000 hours	Qualified	Qualified	Qualified

TABLE 4

The solvent-free heavy-duty anticorrosive coating is prepared by uniformly dispersing a plurality of resins, the performances of corrosion resistance and the like of the solvent-free heavy-duty anticorrosive coating greatly exceed those of the existing anticorrosive coating, the adhesive force of the coating can reach 13Mpa, the hardness can reach 6H, the salt spray resistance can exceed 5000H, the humidity and heat resistance can exceed 4000H, the impact resistance can reach 100cm, the flexibility can reach 2mm, the 10% (H2SO4) can withstand 1000H, the 10% (NaOH) can withstand 1000H, the 3% (NaCl) can withstand 720H, the 93# gasoline can withstand 600H, and the chloride ion permeability can be 0.65X10-3mg/(cm2. d). The coating is a solvent-free coating, so that the integrity, construction safety and economy of the coating are improved in the preparation process of the coating, the development trend of policies is met, the graphene slurry has hydrophobicity and oleophobicity, the lamellar structure of the graphene slurry has a labyrinth effect, the permeation of water, corrosive ions and the like to a metal base material can be blocked, the corrosion speed of the metal base material is delayed, the substrate is further subjected to an anticorrosion effect, the anticorrosion performance of the coating is greatly improved, and meanwhile, the coating has outstanding green environmental protection performance.

Example 3

(1) Preparing materials: see Table 5

TABLE 5

(2) And B: preparing nano composite sol: dispersing lignosulfonate in deionized water, adding saccharifying enzyme, and performing ultrasonic treatment for 0.5-1 h to obtain activated lignosulfonate solution; dispersing tetrabutyl titanate in a pentaerythritol solution, adding an activated lignosulfonate solution into the pentaerythritol solution, uniformly stirring, gradually adding an aminosilane coupling agent, adding ammonia water to adjust the pH value of the system to be alkaline, stirring and reacting at 50-80 ℃ for 1-3 h, then adding 2-hydroxy-4-n-octoxy benzophenone, and stirring and reacting for 0.5-2 h to obtain a modified nano composite sol;

(3) and C: preparing graphene hydrosol: dispersing graphene oxide and melamine in a glycerol aqueous solution, stirring and reacting at 40-50 ℃ for 12-24 h, cooling to room temperature, adding cysteine, stirring and reacting for 3-5 h, adding aluminum chloride, and uniformly stirring to obtain a modified graphene oxide hydrosol;

(4) step D: mixing materials: adding the prepared nano composite sol, active diluent and dispersing agent into low-viscosity epoxy resin, and stirring at the speed of 300-1000 rpm for 20-60 minutes to obtain a mixed solution;

(5) step E: adding auxiliary materials: adding basalt flakes, basalt fibers, ferrophosphorus powder, aluminum sheets and barium sulfate into the mixed solution obtained in the step (D), and stirring at the speed of 1400-1500 rpm for 20-60 minutes;

(6) step F: coating component A: gradually dropwise adding the modified graphene oxide hydrosol, stirring and dispersing for 15-30 min, adding the rheological additive, and stirring for 40min at 2500rpm to obtain a solvent-free anticorrosive coating component A;

(7) step H: a coating component B: under the action of a thixotropic thickener, a Mannich base curing agent is mixed with an epoxy resin curing agent tetraethylenetriamine to prepare a solvent-free anticorrosive paint component B;

(8) step I: and (3) finished product: and mixing the component A and the component B according to a ratio of 4-6: 1, and stirring at a speed of 300-1000 rpm for 10-20 minutes to obtain the solvent-free heavy-duty anticorrosive coating.

The main performance test results are shown in table 6 below.

TABLE 6

The solvent-free heavy-duty anticorrosive coating has the adhesive force of 10-12 MPa, the hardness of 4H-5H, the salt spray resistance of over 3000H, the impact resistance of 50cm, the flexibility of 1 mm-2 mm, the resistance of over 10% H2SO 4720H, the resistance of over 10% NaOH 720H, the resistance of over 3% NaCl 680H, the resistance of over 93# gasoline of over 500H and the chloride ion permeability resistance of less than 0.9 multiplied by 10 < -3 > mg/(cm < 2 > d). The mechanical and corrosion-resistant properties of the coating are excellent: the coating has the characteristics of good film-forming property and high adhesive force of epoxy resin, and also has the characteristics of high viscosity, good gloss retention property of alkyd resin, good flexibility, wear resistance, oil resistance, water resistance and good chemical corrosion resistance of polyamide resin, in addition, the coating film is three-in-one in bottom and middle surface, the single film-forming thickness can reach 500 mu m, the coating times can be reduced, the construction difficulty is reduced, and the coating is energy-saving and environment-friendly.