Biomass modified epoxy resin coating and preparation method thereof

Abstract

The invention discloses a biomass modified epoxy resin coating and a preparation method thereof, relates to the field of epoxy resin coatings, and aims to solve the problems of poor weather resistance and poor adhesion to low-surface-energy materials in the conventional biomass modified epoxy resin coating. The coating comprises a component A and a component B, wherein the component A comprises epoxy resin, a reactive diluent, hyperbranched resin, epoxidized graphene, zirconium silicate, naringin dihydrochalcone, an inorganic filler, a leveling agent and a thixotropic agent; and the component B comprises fatty amine, low-molecular liquid polyamide, a curing accelerator, amino-terminated liquid nitrile rubber and a multifunctional additive. The biomass modified epoxy resin coating adopts the renewable biomass raw materials with wide sources, is economical and environment-friendly, and improves the cohesive force, adhesive force and weather resistance of the epoxy resin coating through multiple intramolecular and intermolecular hydrogen-bond interaction of hydroxyl, amido and furan rings and the rivet effect of the multifunctional additive. The method is used for preparing the high-performance biomass modified epoxy resin coating.

Description

Technical Field

[0001] The invention relates to the field of epoxy resin coatings, and in particular to a biomass modified epoxy resin coating and a preparation method thereof. Background Art

[0002] Epoxy resin coatings have been widely used in architectural home decoration, industrial coatings, aerospace, automobile manufacturing, electronic packaging and marine engineering due to their excellent mechanical properties, chemical stability and excellent adhesion. However, with the continuous advancement of industrialization and the improvement of environmental awareness, the performance bottlenecks and environmental problems of traditional epoxy resin coatings have gradually emerged, restricting their further development and application. Traditional epoxy resin coatings mainly rely on petroleum-based raw materials, which are relatively expensive. At the same time, their coatings have poor adhesion on low surface energy substrates and are difficult to meet the application requirements of complex substrates. In addition, due to long-term exposure to humid heat and salt spray aging environments, the problem of insufficient weather resistance of epoxy coatings is more prominent, and they are prone to aging, which shortens their service life. More importantly, the production and use of traditional epoxy resin coatings often involve the release of toxic solvents and volatile organic compounds (VOCs), which not only pose a threat to the environment, but also pose potential hazards to human health. In response to these problems, researchers continue to explore new modification technologies to improve the comprehensive performance of epoxy resin coatings while achieving the goal of green environmental protection.

[0003] In recent years, biomass materials have become an important research direction in the field of epoxy resin modification due to their low price, renewability and environmental friendliness. Compared with traditional petroleum-based modifiers, biomass modifiers have the advantages of low cost and environmental friendliness, which can not only improve the performance of coatings, but also reduce the environmental burden during production and use. However, existing biomass-modified epoxy resin coatings still have problems such as poor weather resistance, narrow application range, and poor adhesion to many low-surface-energy materials. Summary of the invention

[0004] The present invention aims to solve the problems of poor weather resistance and poor adhesion to low surface energy materials in existing biomass modified epoxy resin coatings, and provides a biomass modified epoxy resin coating and a preparation method thereof.

[0005] The biomass-modified epoxy resin coating of the present invention comprises a component A and a component B, wherein the component A comprises, by weight, 50 to 80 parts of epoxy resin, 10 to 25 parts of reactive diluent, 5 to 20 parts of hyperbranched resin, 0.03 to 1.5 parts of epoxidized graphene, 1 to 3 parts of zirconium silicate, 10 to 25 parts of naringin dihydrochalcone, 30 to 50 parts of inorganic filler, 0.2 to 2 parts of leveling agent and 0.5 to 5 parts of thixotropic agent; and the component B comprises, by weight, 50 to 80 parts of epoxy resin, 10 to 25 parts of reactive diluent, 5 to 20 parts of hyperbranched resin, 0.03 to 1.5 parts of epoxidized graphene, 1 to 3 parts of zirconium silicate, 10 to 25 parts of naringin dihydrochalcone, 30 to 50 parts of inorganic filler, 0.2 to 2 parts of leveling agent and 0.5 to 5 parts of thixotropic agent. The mass proportions include: 8-15 parts of fatty amine, 25-40 parts of low molecular liquid polyamide, 1-8 parts of curing accelerator, 4-10 parts of amino-terminated liquid nitrile rubber and 5-12 parts of multifunctional additive; wherein the preparation method of the multifunctional additive is: multifunctional glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid are mixed in a mass ratio of 1: (55-65): (35-45), the mixing temperature is 60-80°C, and the mixing time is 2-6h.

[0006] Furthermore, the epoxy resin is a liquid epoxy resin, which is one or a mixture of several of E-44, E-51, F-44, AG-70, AG-80, and TDE-85.

[0007] Furthermore, the active diluent is any one of 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and neopentyl glycol diglycidyl ether.

[0008] Furthermore, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton, with a molecular weight of 1000 to 6400 g / mol and an epoxy equivalent of 410 to 560 g / mol.

[0009] Furthermore, the particle size of the zirconium silicate is 0.1-2 μm.

[0010] Furthermore, the inorganic filler is one or a mixture of titanium dioxide, aluminum oxide, calcium carbonate, quartz powder, and mica powder.

[0011] Furthermore, the leveling agent is any one of SHYT4184, RF-7560, MOK2620, and BYK333.

[0012] Furthermore, the thixotropic agent is any one of fumed silica R202, R974, SR200, TS620, and MT-10.

[0013] Furthermore, the fatty amine is any one of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, and polyethylenepolyamine.

[0014] Furthermore, the low molecular weight liquid polyamide is any one of V115, V125, 650, and 651.

[0015] Furthermore, the curing accelerator is any one of 2,4,6-tris(dimethylaminomethyl)phenol, benzyldimethylamine, triethanolamine, 2-butyl-4-hydroxymethylimidazole, and 1,2-dimethylimidazole.

[0016] Furthermore, the multifunctional glycidyl ether is any one of castor oil glycidyl ether, epoxy soybean oil, and sorbitol glycidyl ether.

[0017] The present invention also provides a method for preparing a biomass-modified epoxy resin coating, comprising the following steps:

[0018] 1. Weigh 50-80 parts of epoxy resin, 10-25 parts of active diluent, 5-20 parts of hyperbranched resin, 0.03-1.5 parts of epoxide graphene, 1-3 parts of zirconium silicate, 10-25 parts of naringin dihydrochalcone, 30-50 parts of inorganic filler, 0.2-2 parts of leveling agent and 0.5-5 parts of thixotropic agent according to mass proportion;

[0019] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0020] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 25-60° C., and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added, stirred and mixed, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0021] 4. Weigh 8-15 parts of fatty amine, 25-40 parts of low molecular liquid polyamide, 1-8 parts of curing accelerator, 4-10 parts of amino-terminated liquid nitrile rubber and 5-12 parts of multifunctional additives by mass;

[0022] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are uniformly mixed at 70-100° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred to obtain component B;

[0023] 6. Mix the component A obtained in step 3 and the component B obtained in step 5, stir evenly, and obtain a biomass-modified epoxy resin coating.

[0024] Beneficial effects of the present invention:

[0025] The biomass-modified epoxy resin coating of the present invention adopts naringin dihydrochalcone. Naringin dihydrochalcone contains hydroxyl and chalcone structural units, and can form multiple intramolecular and intermolecular hydrogen bonds with various groups in the epoxy resin and the curing agent and the furan group on the furfurylamine, and simultaneously exerts a synergistic effect with the hyperbranched epoxy resin containing an organosilicon skeleton, and can simultaneously improve the cohesion and weather resistance of the epoxy coating.

[0026] The present invention constructs a new multifunctional additive through chemical bonding reaction of multifunctional glycidyl ether with furfurylamine and 2-aminoethyl phosphoric acid, and forms a strong "rivet" effect on the interface of various low surface energy materials such as wood, cement, tetrafluoroethylene, stainless steel, aluminum alloy, titanium alloy, magnesium aluminum alloy, etc. through multiple intramolecular and intermolecular coordination bonds and chemical bonds of hydroxyl, amine and furan ring, thereby improving the adhesion effect.

[0027] The present invention adopts a variety of natural and semi-natural chemical materials such as naringin dihydrochalcone, castor oil glycidyl ether, epoxy soybean oil, sorbitol glycidyl ether, etc., and has both green environmental protection and economic advantages. Wherein, the adopted naringin dihydrochalcone is a derivative of the natural product naringin (Naringin), and naringin is widely present in the peel, pulp and seeds of citrus fruits. However, in the production process of citrus processed products, a large amount of peels, fruit cores and waste are treated as industrial waste. Through the green and environmentally friendly efficient purification and enzymatic conversion method, these waste resources become an important source for preparing naringin dihydrochalcone, which not only meets the concept of circular economy, but also reduces production costs.

[0028] In addition, the modified epoxy resin coating of the present invention does not add any organic solvent during the processing, manufacturing and use, and has a simple manufacturing process, is safe, environmentally friendly and user-friendly. The present invention is used to prepare high-performance biomass modified epoxy resin coatings. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is not limited to the specific implementation modes listed below, but also includes any combination of the specific implementation modes.

[0030] Specific implementation method 1: The biomass-modified epoxy resin coating of this implementation method comprises component A and component B, wherein component A comprises, by mass, 50-80 parts of epoxy resin, 10-25 parts of active diluent, 5-20 parts of hyperbranched resin, 0.03-1.5 parts of epoxidized graphene, 1-3 parts of zirconium silicate, 10-25 parts of naringin dihydrochalcone, 30-50 parts of inorganic filler, 0.2-2 parts of leveling agent and 0.5-5 parts of thixotropic agent; Component B comprises, by mass, 8 to 15 parts of fatty amine, 25 to 40 parts of low molecular liquid polyamide, 1 to 8 parts of curing accelerator, 4 to 10 parts of amino-terminated liquid nitrile rubber and 5 to 12 parts of multifunctional additive; wherein the preparation method of the multifunctional additive is: multifunctional glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid are mixed in a mass ratio of 1: (55 to 65): (35 to 45), the mixing temperature is 60 to 80°C, and the mixing time is 2 to 6 hours.

[0031] The biomass-modified epoxy resin coating of the present invention adopts naringin dihydrochalcone. Naringin dihydrochalcone contains hydroxyl and chalcone structural units, and can form multiple intramolecular and intermolecular hydrogen bonds with various groups in the epoxy resin and the curing agent and the furan group on the furfurylamine, and simultaneously exerts a synergistic effect with the hyperbranched epoxy resin containing an organosilicon skeleton, and can simultaneously improve the cohesion and weather resistance of the epoxy coating.

[0032] The present invention constructs a new multifunctional additive through chemical bonding reaction of multifunctional glycidyl ether with furfurylamine and 2-aminoethyl phosphoric acid, and forms a strong "rivet" effect through coordination bonds and chemical bonds on the interface of various low surface energy materials such as wood, cement, tetrafluoroethylene, stainless steel, aluminum alloy, titanium alloy, magnesium aluminum alloy, etc., thereby improving the adhesion effect.

[0033] Compared with traditional silane coupling agents, low surface tolerance agents, and adhesion promoters, the multifunctional additive used in the present invention is easy to disperse, does not contain solvents, is not easy to hydrolyze, can form effective coordination bonds and chemical bonds with a variety of interfaces, improves the adhesion and bonding effects, and has very strong applicability.

[0034] Specific implementation method 2: The epoxy resin described in this implementation method is a liquid epoxy resin, which is one or a mixture of E-44, E-51, F-44, AG-70, AG-80, TDE-85. Other steps and parameters are the same as those in specific implementation method 1.

[0035] Specific implementation method three: The active diluent described in this implementation method is any one of 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and neopentyl glycol diglycidyl ether. Other steps and parameters are the same as those of specific implementation method one or two.

[0036] Specific embodiment 4: The hyperbranched resin in this embodiment is a hyperbranched epoxy resin containing an organic silicon skeleton, with a molecular weight of 1000-6400 g / mol and an epoxy equivalent of 410-560 g / mol. Other steps and parameters are the same as those in specific embodiments 1 to 3.

[0037] The organic silicon skeleton in the hyperbranched epoxy resin of this embodiment can enhance the weather resistance of the resin.

[0038] Specific implementation method 5: The particle size of the zirconium silicate in this implementation method is 0.1-2 μm. Other steps and parameters are the same as those in specific implementation methods 1 to 4.

[0039] Zirconium silicate mainly plays the role of grinding and dispersing epoxide graphene. Selecting this particle size range can achieve the best grinding and dispersing effects.

[0040] Specific implementation method 6: The inorganic filler in this implementation method is one or a mixture of titanium dioxide, aluminum oxide, calcium carbonate, quartz powder, and mica powder. Other steps and parameters are the same as those in specific implementation methods 1 to 5.

[0041] Specific implementation method 7: The leveling agent in this implementation method is any one of SHYT4184, RF-7560, MOK2620, and BYK333. Other steps and parameters are the same as those in specific implementation methods 1 to 6.

[0042] Specific embodiment eight: The thixotropic agent in this embodiment is any one of fumed silica R202, R974, SR200, TS620, and MT-10. Other steps and parameters are the same as those in specific embodiments one to seven.

[0043] Specific embodiment 9: The fatty amine described in this embodiment is any one of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine and polyethylenepolyamine. Other steps and parameters are the same as those of specific embodiments 1 to 8.

[0044] Specific embodiment 10: The low molecular liquid polyamide described in this embodiment is any one of V115, V125, 650, and 651. Other steps and parameters are the same as those of specific embodiments 1 to 9.

[0045] Specific embodiment eleven: The curing accelerator in this embodiment is any one of 2,4,6-tris(dimethylaminomethyl)phenol, benzyldimethylamine, triethanolamine, 2-butyl-4-hydroxymethylimidazole, and 1,2-dimethylimidazole. Other steps and parameters are the same as those in specific embodiments one to ten.

[0046] Specific embodiment 12: The multifunctional glycidyl ether in this embodiment is any one of castor oil glycidyl ether, epoxy soybean oil, and sorbitol glycidyl ether. Other steps and parameters are the same as those in specific embodiments 1 to 11.

[0047] Specific implementation method 13: The preparation method of the biomass-modified epoxy resin coating in this implementation method comprises the following steps:

[0048] 1. Weigh 50-80 parts of epoxy resin, 10-25 parts of active diluent, 5-20 parts of hyperbranched resin, 0.03-1.5 parts of epoxide graphene, 1-3 parts of zirconium silicate, 10-25 parts of naringin dihydrochalcone, 30-50 parts of inorganic filler, 0.2-2 parts of leveling agent and 0.5-5 parts of thixotropic agent according to mass proportion;

[0049] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0050] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 25-60° C., and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added, stirred and mixed, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0051] 4. Weigh 8-15 parts of fatty amine, 25-40 parts of low molecular liquid polyamide, 1-8 parts of curing accelerator, 4-10 parts of amino-terminated liquid nitrile rubber and 5-12 parts of multifunctional additives by mass;

[0052] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are uniformly mixed at 70-100° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred to obtain component B;

[0053] 6. Mix the component A obtained in step 3 and the component B obtained in step 5, stir evenly, and obtain a biomass-modified epoxy resin coating.

[0054] It is well known to those skilled in the art that graphene can significantly improve the heat resistance, mechanical properties, wear resistance and weather resistance of epoxy resin coatings. However, it is worth noting that in order to make the epoxy graphene uniformly dispersed in the epoxy resin, the traditional method is to use water or an organic solvent as a medium, disperse it through a high-speed machine, and then remove the medium. This type of method has a complex preparation process and is accompanied by environmental pollution problems. In step 2 of the preparation method of the present invention, a low-viscosity active diluent that can participate in the chemical reaction is used as a medium, and zirconium silicate is used as a grinding particle, so that the epoxy graphene is uniformly dispersed in the epoxy resin, is not easy to be stratified, is stable in storage, and the preparation process is relatively simple, safe and environmentally friendly.

[0055] The embodiments of the present invention are described in detail below. The following embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation schemes and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0056] Embodiment 1:

[0057] The preparation method of the biomass-modified epoxy resin coating of this embodiment is carried out according to the following steps:

[0058] 1. Weigh 70 parts of epoxy resin, 15 parts of active diluent, 12 parts of hyperbranched resin, 0.5 parts of epoxidized graphene, 2 parts of zirconium silicate, 20 parts of naringin dihydrochalcone, 36 parts of inorganic filler, 1 part of leveling agent and 2 parts of thixotropic agent by mass; wherein the epoxy resin is liquid epoxy resin E-44, the active diluent is 1,4-butanediol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 3000 g / mol and an epoxy equivalent of 450 g / mol, the inorganic filler is titanium dioxide, the leveling agent is RF-7560, the thixotropic agent is fumed silica R202, and the particle size of zirconium silicate is 0.2 μm;

[0059] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0060] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 25° C. in a conventional manner, and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0061] 4. Weigh 10 parts of fatty amine, 28 parts of low molecular liquid polyamide, 4 parts of curing accelerator, 6 parts of amino-terminated liquid nitrile rubber and 8 parts of multifunctional additive by mass; wherein the fatty amine is diethylenetriamine, the low molecular liquid polyamide is 651, and the curing accelerator is triethanolamine; the multifunctional additive is prepared by mixing castor oil glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:60:40 at 65°C for 5 hours;

[0062] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are mixed uniformly at 80° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred uniformly to obtain component B;

[0063] 6. Mix component A and component B, stir evenly, and obtain biomass modified epoxy resin coating.

[0064] Embodiment 2:

[0065] The preparation method of the biomass-modified epoxy resin coating of this embodiment is carried out according to the following steps:

[0066] 1. Weigh 75 parts of epoxy resin, 22 parts of active diluent, 15 parts of hyperbranched resin, 1.1 parts of epoxidized graphene, 2 parts of zirconium silicate, 24 parts of naringin dihydrochalcone, 45 parts of inorganic filler, 0.4 parts of leveling agent and 3.8 parts of thixotropic agent by mass; wherein the epoxy resin is prepared by mixing liquid epoxy resin E-44 and E-51 in a mass ratio of 1:2, the active diluent is neopentyl glycol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 3000 g / mol and an epoxy equivalent of 450 g / mol, the inorganic filler is mica powder, the leveling agent is BYK333, the thixotropic agent is fumed silica MT-10, and the particle size of zirconium silicate is 0.2 μm;

[0067] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0068] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 50° C. in a conventional manner, and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0069] 4. Weigh 15 parts of fatty amine, 25 parts of low molecular liquid polyamide, 2 parts of curing accelerator, 8.5 parts of amino-terminated liquid nitrile rubber and 10 parts of multifunctional additive by mass; wherein the fatty amine is triethylenetetramine, the low molecular liquid polyamide is V125, and the curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol; the multifunctional additive is prepared by mixing castor oil glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:60:40 at 65°C for 5 hours;

[0070] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are mixed uniformly at 95° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred uniformly to obtain component B;

[0071] 6. Mix component A and component B evenly to obtain a biomass-modified epoxy resin coating.

[0072] Embodiment 3:

[0073] The preparation method of the biomass-modified epoxy resin coating of this embodiment is carried out according to the following steps:

[0074] 1. Weigh 52 parts of epoxy resin, 25 parts of active diluent, 6 parts of hyperbranched resin, 0.04 parts of epoxidized graphene, 1 part of zirconium silicate, 12 parts of naringin dihydrochalcone, 48 parts of inorganic filler, 1.5 parts of leveling agent and 0.7 parts of thixotropic agent by mass; wherein the epoxy resin is prepared by mixing liquid epoxy resin E-51 and AG-80 in a mass ratio of 2:3, the active diluent is ethylene glycol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 6100 g / mol and an epoxy equivalent of 520 g / mol, the inorganic filler is calcium carbonate, the leveling agent is BYK333, the thixotropic agent is fumed silica R974, and the particle size of the zirconium silicate is 1 μm;

[0075] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0076] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 35° C. in a conventional manner, and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0077] 4. Weigh 11 parts of fatty amine, 36 parts of low molecular liquid polyamide, 5 parts of curing accelerator, 5.5 parts of amino-terminated liquid nitrile rubber and 6 parts of multifunctional additive by mass; wherein the fatty amine is hexamethylenediamine, the low molecular liquid polyamide is V115, the curing accelerator is 1,2-dimethylimidazole, and the multifunctional additive is prepared by mixing epoxy soybean oil, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:55:45 at 80°C for 2 hours;

[0078] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are mixed uniformly at 80° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred uniformly to obtain component B;

[0079] 6. Mix component A and component B evenly to obtain a biomass-modified epoxy resin coating.

[0080] Embodiment 4:

[0081] The preparation method of the biomass-modified epoxy resin coating of this embodiment is carried out according to the following steps:

[0082] 1. Weigh 65 parts of epoxy resin, 14 parts of active diluent, 17 parts of hyperbranched resin, 0.7 parts of epoxidized graphene, 1 part of zirconium silicate, 22 parts of naringin dihydrochalcone, 40 parts of inorganic filler, 0.8 parts of leveling agent and 4.5 parts of thixotropic agent by mass; wherein the epoxy resin is liquid epoxy resin F-44, the active diluent is ethylene glycol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 1600 g / mol and an epoxy equivalent of 418 g / mol, the inorganic filler is a mixture of aluminum oxide and calcium carbonate in a mass ratio of 1:1, the leveling agent is MOK2620, the thixotropic agent is fumed silica TS620, and the particle size of the zirconium silicate is 2 μm;

[0083] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0084] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 60° C. in a conventional manner, and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0085] 4. Weigh 10 parts of fatty amine, 30 parts of low molecular liquid polyamide, 6 parts of curing accelerator, 7 parts of amino-terminated liquid nitrile rubber and 9 parts of multifunctional additive by mass; wherein the fatty amine is ethylenediamine, the low molecular liquid polyamide is V115, and the curing accelerator is benzyldimethylamine; the multifunctional additive is prepared by mixing epoxy soybean oil, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:55:45 at 80°C for 2 hours;

[0086] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are uniformly mixed at 90° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred to obtain component B;

[0087] 6. Mix component A and component B evenly to obtain a biomass-modified epoxy resin coating.

[0088] Embodiment 5:

[0089] The preparation method of the biomass-modified epoxy resin coating of this embodiment is carried out according to the following steps:

[0090] 1. Weigh 75 parts of epoxy resin, 19 parts of active diluent, 14 parts of hyperbranched resin, 1.3 parts of epoxidized graphene, 3 parts of zirconium silicate, 18 parts of naringin dihydrochalcone, 40 parts of inorganic filler, 1.8 parts of leveling agent and 1.6 parts of thixotropic agent by mass; wherein the epoxy resin is a mixture of liquid epoxy resin F-44, AG-70 and AG-80 in a mass ratio of 6:3:1, the active diluent is 1,6-hexanediol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 3000 g / mol and an epoxy equivalent of 450 g / mol, the inorganic filler is a mixture of quartz powder and calcium carbonate in a mass ratio of 1:3, the leveling agent is MOK2620, the thixotropic agent is fumed silica R202, and the particle size of zirconium silicate is 1 μm;

[0091] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0092] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 55° C. in a conventional manner, and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0093] 4. Weigh 8.5 parts of fatty amine, 34 parts of low molecular liquid polyamide, 6 parts of curing accelerator, 4 parts of amino-terminated liquid nitrile rubber and 11 parts of multifunctional additive by mass; wherein the fatty amine is polyethylene polyamine, the low molecular liquid polyamide is 650, the curing accelerator is 2,4,6-tris(dimethylaminomethyl)phenol, and the multifunctional additive is prepared by mixing sorbitol glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:62:38 at 70°C for 4 hours;

[0094] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are mixed uniformly at 80° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred uniformly to obtain component B;

[0095] 6. Mix component A and component B, stir evenly, and obtain biomass modified epoxy resin coating.

[0096] Embodiment 6:

[0097] The preparation method of the biomass-modified epoxy resin coating of this embodiment is carried out according to the following steps:

[0098] 1. Weigh 55 parts of epoxy resin, 23 parts of active diluent, 9 parts of hyperbranched resin, 0.3 parts of epoxidized graphene, 2 parts of zirconium silicate, 15 parts of naringin dihydrochalcone, 32 parts of inorganic filler, 1.2 parts of leveling agent and 2.6 parts of thixotropic agent by mass; wherein the epoxy resin is a mixture of liquid epoxy resins E-51, F-44 and TDE-85 in a mass ratio of 7:1:3, the active diluent is 1,4-butanediol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 6100 g / mol and an epoxy equivalent of 520 g / mol, the inorganic filler is titanium dioxide, the leveling agent is SHYT 4184, the thixotropic agent is fumed silica SR200, and the particle size of zirconium silicate is 1 μm;

[0099] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0100] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 50° C. in a conventional manner, and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0101] 4. Weigh 12 parts of fatty amine, 27 parts of low molecular liquid polyamide, 7 parts of curing accelerator, 8 parts of amino-terminated liquid nitrile rubber and 9 parts of multifunctional additive by mass; wherein the fatty amine is triethylenetetramine, the low molecular liquid polyamide is V125, the curing accelerator is 2-butyl-4-hydroxymethylimidazole, and the multifunctional additive is prepared by mixing castor oil glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:60:40 at 65°C for 5 hours;

[0102] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are uniformly mixed at 75° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred to obtain component B;

[0103] 6. Mix component A and component B, stir evenly, and obtain biomass modified epoxy resin coating.

[0104] Embodiment 7:

[0105] The preparation method of the biomass-modified epoxy resin coating of this embodiment is carried out according to the following steps:

[0106] 1. Weigh 75 parts of epoxy resin, 11 parts of active diluent, 18 parts of hyperbranched resin, 0.7 parts of epoxidized graphene, 2 parts of zirconium silicate, 22 parts of naringin dihydrochalcone, 45 parts of inorganic filler, 1.6 parts of leveling agent and 1.5 parts of thixotropic agent by mass; wherein the epoxy resin is a mixture of liquid epoxy resin E-51, AG-80 and TDE-85 in a mass ratio of 2:1:2, the active diluent is ethylene glycol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 1600 g / mol and an epoxy equivalent of 418 g / mol, the inorganic filler is a mixture of aluminum oxide, calcium carbonate and mica powder in a mass ratio of 5:3:7, the leveling agent is BYK333, the thixotropic agent is fumed silica MT-10, and the particle size of zirconium silicate is 0.5 μm;

[0107] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0108] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 60° C. in a conventional manner, and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0109] 4. Weigh 14 parts of fatty amine, 35 parts of low molecular liquid polyamide, 3 parts of curing accelerator, 5 parts of amino-terminated liquid nitrile rubber and 6 parts of multifunctional additive by mass; wherein the fatty amine is tetraethylenepentamine, the low molecular liquid polyamide is 650, the curing accelerator is triethanolamine, and the multifunctional additive is prepared by mixing sorbitol glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:62:38 at 70°C for 4 hours;

[0110] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are uniformly mixed at 100° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred to obtain component B;

[0111] 6. Mix component A and component B evenly to obtain a high-performance biomass-modified epoxy resin coating.

[0112] Comparative Example 1:

[0113] The preparation method of the biomass-modified epoxy resin coating of this comparative example is carried out according to the following steps:

[0114] Compared with Example 4, no naringin dihydrochalcone was added in Comparative Example 1, and the other steps were the same as those in Example 4.

[0115] 1. Weigh 65 parts of epoxy resin, 14 parts of active diluent, 17 parts of hyperbranched resin, 0.7 parts of epoxidized graphene, 1 part of zirconium silicate, 40 parts of inorganic filler, 0.8 parts of leveling agent and 4.5 parts of thixotropic agent by mass; wherein the epoxy resin is liquid epoxy resin F-44, the active diluent is ethylene glycol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 1600 g / mol and an epoxy equivalent of 418 g / mol, the inorganic filler is a mixture of aluminum oxide and calcium carbonate in a mass ratio of 1:1, the leveling agent is MOK2620, the thixotropic agent is fumed silica TS620, and the particle size of zirconium silicate is 2 μm;

[0116] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0117] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 60° C. in a conventional manner, and then inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0118] 4. Weigh 10 parts of fatty amine, 30 parts of low molecular liquid polyamide, 6 parts of curing accelerator, 7 parts of amino-terminated liquid nitrile rubber and 9 parts of multifunctional additive by mass; wherein the fatty amine is ethylenediamine, the low molecular liquid polyamide is V115, the curing accelerator is benzyldimethylamine, and the multifunctional additive is prepared by mixing epoxy soybean oil, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:55:45 at 80°C for 2 hours;

[0119] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are uniformly mixed at 90° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred to obtain component B;

[0120] 6. Mix component A and component B evenly to obtain a biomass-modified epoxy resin coating.

[0121] Comparative Example 2:

[0122] The preparation method of the biomass-modified epoxy resin coating of this comparative example is carried out according to the following steps:

[0123] Compared with Example 4, no hyperbranched epoxy resin containing an organosilicon skeleton was added in Comparative Example 2, and the rest was the same as Example 4.

[0124] 1. Weigh 65 parts of epoxy resin, 14 parts of active diluent, 0.7 parts of epoxidized graphene, 1 part of zirconium silicate, 22 parts of naringin dihydrochalcone, 40 parts of inorganic filler, 0.8 parts of leveling agent and 4.5 parts of thixotropic agent by mass; wherein the epoxy resin is liquid epoxy resin F-44, the active diluent is ethylene glycol diglycidyl ether, the inorganic filler is a mixture of aluminum oxide and calcium carbonate in a mass ratio of 1:1, the leveling agent is MOK2620, the thixotropic agent is fumed silica TS620, and the particle size of zirconium silicate is 2 μm;

[0125] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0126] 3. Stir the epoxy resin, naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the product of step 2 weighed in step 1 together, and then grind and disperse them three times using a three-roll grinder to obtain component A;

[0127] 4. Weigh 10 parts of fatty amine, 30 parts of low molecular liquid polyamide, 6 parts of curing accelerator, 7 parts of amino-terminated liquid nitrile rubber and 9 parts of multifunctional additive by mass; wherein the fatty amine is ethylenediamine, the low molecular liquid polyamide is V115, the curing accelerator is benzyldimethylamine, and the multifunctional additive is prepared by mixing epoxy soybean oil, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:55:45 at 80°C for 2 hours;

[0128] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are uniformly mixed at 90° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred to obtain component B;

[0129] 6. Mix component A and component B evenly to obtain a biomass-modified epoxy resin coating.

[0130] Comparative Example 3:

[0131] The preparation method of the biomass-modified epoxy resin coating of this comparative example is carried out according to the following steps:

[0132] Compared with Example 6, the amount of the multifunctional auxiliary agent added in Comparative Example 3 is less than 5 parts, and the rest is the same as Example 6.

[0133] 1. Weigh 55 parts of epoxy resin, 23 parts of active diluent, 9 parts of hyperbranched resin, 0.3 parts of epoxidized graphene, 2 parts of zirconium silicate, 15 parts of naringin dihydrochalcone, 32 parts of inorganic filler, 1.2 parts of leveling agent and 2.6 parts of thixotropic agent by mass; wherein the epoxy resin is a mixture of liquid epoxy resins E-51, F-44 and TDE-85 in a mass ratio of 7:1:3, the active diluent is 1,4-butanediol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 6100 g / mol and an epoxy equivalent of 520 g / mol, the inorganic filler is titanium dioxide, the leveling agent is SHYT 4184, the thixotropic agent is fumed silica SR200, and the particle size of zirconium silicate is 1 μm;

[0134] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0135] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 50° C. in a conventional manner, and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0136] 4. Weigh 12 parts of fatty amine, 27 parts of low molecular liquid polyamide, 7 parts of curing accelerator, 8 parts of amino-terminated liquid nitrile rubber and 2 parts of multifunctional additive by mass; wherein the fatty amine is triethylenetetramine, the low molecular liquid polyamide is V125, the curing accelerator is 2-butyl-4-hydroxymethylimidazole, and the multifunctional additive is prepared by mixing castor oil glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:60:40 at 65°C for 5 hours;

[0137] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are uniformly mixed at 75° C. in a conventional manner, then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred to obtain component B;

[0138] 6. Mix component A and component B evenly to obtain a biomass-modified epoxy resin coating.

[0139] Comparative Example 4:

[0140] The preparation method of the biomass-modified epoxy resin coating of this comparative example is carried out according to the following steps:

[0141] Compared with Example 6, no multifunctional additive was added in Comparative Example 4, and the rest was the same as Example 6.

[0142] 1. Weigh 55 parts of epoxy resin, 23 parts of active diluent, 9 parts of hyperbranched resin, 0.3 parts of epoxidized graphene, 2 parts of zirconium silicate, 15 parts of naringin dihydrochalcone, 32 parts of inorganic filler, 1.2 parts of leveling agent and 2.6 parts of thixotropic agent by mass; wherein the epoxy resin is a mixture of liquid epoxy resins E-51, F-44 and TDE-85 in a mass ratio of 7:1:3, the active diluent is 1,4-butanediol diglycidyl ether, the hyperbranched resin is a hyperbranched epoxy resin containing an organosilicon skeleton with a molecular weight of 6100 g / mol and an epoxy equivalent of 520 g / mol, the inorganic filler is titanium dioxide, the leveling agent is SHYT 4184, the thixotropic agent is fumed silica SR200, and the particle size of zirconium silicate is 1 μm;

[0143] 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture;

[0144] 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 50° C. in a conventional manner, and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added and stirred together, and then ground and dispersed three times using a three-roll mill to obtain component A;

[0145] 4. Weigh 12 parts of fatty amine, 27 parts of low molecular liquid polyamide, 7 parts of curing accelerator and 8 parts of amino-terminated liquid nitrile rubber by mass; wherein the fatty amine is triethylenetetramine, the low molecular liquid polyamide is V125, the curing accelerator is 2-butyl-4-hydroxymethylimidazole, and the multifunctional additive is prepared by mixing castor oil glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid at a mass ratio of 1:60:40 at 65°C for 5 hours;

[0146] 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are uniformly mixed at 75° C. in a conventional manner, and then cooled to room temperature to obtain component B;

[0147] 6. Mix component A and component B evenly to obtain a biomass-modified epoxy resin coating.

[0148] The biomass modified epoxy resin coatings prepared in Examples 1 to 7 and Comparative Examples 1 to 4 were cured at room temperature for 3 days and then subjected to adhesion test according to the GB / T 5210-2006 method. The uniformly mixed coatings were then coated on the surfaces of different materials such as aluminum alloy plates, tetrafluoroethylene plates, stainless steel plates, and titanium alloy plates, and cured at room temperature for 3 days to obtain coatings with a coating thickness of 50±5μm. The coating appearance was visually observed and recorded, and the test results are shown in Table 1.

[0149] The aluminum alloy plate with coating was then subjected to weathering environmental aging test. The temperature of the wet heat aging test was 49°C and the relative humidity was 98%; the temperature of the neutral salt spray test was 35°C, 5% sodium chloride solution, and the relative humidity was kept above 95%. After the weathering aging test, the time when the paint layer bubbling and debonding occurred was observed and recorded. The test results exceeding 800h were uniformly recorded as >800h. The test results are shown in Table 2.

[0150] Table 1

[0151]

[0152]

[0153] Table 2

[0154]

[0155] It can be seen from the results in Table 1 and Table 2 that the biomass-modified epoxy resin coatings prepared in Examples 1 to 7 have excellent comprehensive performance. The adhesion measured by the pull-off method is 16.6 to 19.2 MPa, and has good adhesion to a variety of low surface energy difficult-to-bond materials such as tetrafluoroethylene, stainless steel, and titanium alloy. The paint surface is flat and smooth. After 800 hours of wet heat aging and neutral salt spray aging, the paint layer does not blister or debond.

[0156] No naringin dihydrochalcone was added in Comparative Example 1, no hyperbranched epoxy resin containing an organosilicon skeleton was added in Comparative Example 2, less than 5 parts of multifunctional additives were added in Comparative Example 3, and no multifunctional additives were added in Comparative Example 4. The biomass-modified epoxy resin coatings prepared by these comparative examples cannot achieve good adhesion effects on a variety of low-surface energy difficult-to-bond materials at the same time, wrinkles or debonding phenomena occur, and the weather resistance is also poor. The paint layer bubbling and debonding phenomena occur in a relatively short period of time. This is because the epoxy resin coating lacks naringin dihydrochalcone or hyperbranched resin, and multiple intramolecular and intermolecular hydrogen bonds cannot be formed, and synergistic effects cannot be exerted, thereby affecting the cohesion and weather resistance of the epoxy resin coating. When the multifunctional additive of the present invention is not added or only added in a small amount in the coating, it is impossible to form a strong "rivet" effect with a variety of low-surface energy material interfaces through coordination bonds and chemical bonds, and the adhesion effect is relatively poor, and the weather resistance is also not good.

Claims

1. Biomass modified epoxy resin coating, characterized in that: The coating comprises a component A and a component B. The component A comprises, by weight, 50 to 80 parts of epoxy resin, 10 to 25 parts of active diluent, 5 to 20 parts of hyperbranched resin, 0.03 to 1.5 parts of epoxidized graphene, 1 to 3 parts of zirconium silicate, 10 to 25 parts of naringin dihydrochalcone, 30 to 50 parts of inorganic filler, 0.2 to 2 parts of leveling agent and 0.5 to 5 parts of thixotropic agent; the component B comprises, by weight, 8 to 15 parts of fatty amine, 25 to 40 parts of low-molecular liquid polyamide, 1 to 8 parts of curing accelerator, 4 to 10 parts of amino-terminated liquid nitrile rubber and 5 to 12 parts of multifunctional additive; wherein the multifunctional additive is prepared by mixing multifunctional glycidyl ether, furfurylamine and 2-aminoethyl phosphoric acid in a mass ratio of 1: (55 to 65): (35 to 45), the mixing temperature is 60 to 80° C., and the mixing time is 2 to 6 hours.

2. The biomass-modified epoxy resin coating according to claim 1, characterized in that: The epoxy resin is a liquid epoxy resin, which is one or a mixture of several of E-44, E-51, F-44, AG-70, AG-80 and TDE-85.

3. The biomass-modified epoxy resin coating according to claim 1 or 2, characterized in that: The active diluent is any one of 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether and neopentyl glycol diglycidyl ether.

4. The biomass-modified epoxy resin coating according to claim 3, characterized in that: The hyperbranched resin is a hyperbranched epoxy resin containing an organic silicon skeleton, with a molecular weight of 1000 to 6400 g / mol and an epoxy equivalent of 410 to 560 g / mol.

5. The biomass-modified epoxy resin coating according to claim 4, characterized in that: The particle size of the zirconium silicate is 0.1-2 μm.

6. The biomass-modified epoxy resin coating according to claim 5, characterized in that: The fatty amine is any one of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine and polyethylenepolyamine.

7. The biomass-modified epoxy resin coating according to claim 6, characterized in that: The low molecular weight liquid polyamide is any one of V115, V125, 650 and 651.

8. The biomass-modified epoxy resin coating according to claim 7, characterized in that: The curing accelerator is any one of 2,4,6-tris(dimethylaminomethyl)phenol, benzyldimethylamine, triethanolamine, 2-butyl-4-hydroxymethylimidazole, and 1,2-dimethylimidazole.

9. The biomass-modified epoxy resin coating according to claim 8, characterized in that: The multifunctional glycidyl ether is any one of castor oil glycidyl ether, epoxy soybean oil and sorbitol glycidyl ether.

10. The method for preparing the biomass-modified epoxy resin coating according to claim 1, characterized in that: The method comprises the following steps:

1. Weigh 50-80 parts of epoxy resin, 10-25 parts of active diluent, 5-20 parts of hyperbranched resin, 0.03-1.5 parts of epoxide graphene, 1-3 parts of zirconium silicate, 10-25 parts of naringin dihydrochalcone, 30-50 parts of inorganic filler, 0.2-2 parts of leveling agent and 0.5-5 parts of thixotropic agent according to mass proportion; 2. Grind and disperse the active diluent, graphene oxide and zirconium silicate weighed in step 1 using a three-roll grinder until the appearance is uniform to obtain a mixture; 3. The epoxy resin and hyperbranched resin weighed in step 1 are mixed uniformly at 25-60° C., and then naringin dihydrochalcone, inorganic filler, leveling agent, thixotropic agent and the mixture in step 2 are added, stirred and mixed, and then ground and dispersed three times using a three-roll mill to obtain component A; 4. Weigh 8-15 parts of fatty amine, 25-40 parts of low molecular liquid polyamide, 1-8 parts of curing accelerator, 4-10 parts of amino-terminated liquid nitrile rubber and 5-12 parts of multifunctional additives by mass; 5. The fatty amine, low molecular weight liquid polyamide, curing accelerator and amino-terminated liquid nitrile rubber weighed in step 4 are mixed uniformly at 70-100° C., then cooled to room temperature, and a multifunctional auxiliary agent is added and stirred uniformly to obtain component B; 6. Mix the component A obtained in step 3 and the component B obtained in step 5, stir evenly, and obtain a biomass-modified epoxy resin coating.

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