Triazolyl diatomite modified epoxy resin paint and preparation method thereof

Abstract

The invention relates to the technical field of epoxy resin, and discloses a triazolyl diatomite modified epoxy resin paint, which is characterized in that epoxidized diatomite reacts with lignin to obtain lignin modified diatomite, the lignin modified diatomite reacts with isophorone diisocyanate to obtain isocyanated lignin modified diatomite, and the isocyanated lignin modified diatomite reacts with isophorone diisocyanate to obtain the triazolyl diatomite modified epoxy resin paint. The preparation method comprises the following steps of: further reacting with an imino group in benzotriazole to obtain benzotriazolyl lignin modified diatomite, and blending the benzotriazolyl lignin modified diatomite with epoxy resin and other assistants to finally obtain the triazolyl diatomite modified epoxy resin paint. The mechanical properties such as bending strength and impact strength of the composite epoxy resin paint are improved, the diatomite can form a physical barrier layer to block invasion of corrosive media such as water and oxygen, and the benzotriazole group can form a monomolecular adsorption film on the surface of a matrix, so that the corrosion inhibition and corrosion prevention performance is achieved; the comprehensive performance of the epoxy resin paint is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of epoxy resins, in particular to a triazole-based diatomaceous earth modified epoxy resin paint and a preparation method thereof. Background Art

[0002] In various fields of daily life, rust prevention and corrosion prevention are difficult problems that must be solved, especially in special fields such as navigation and aviation. Not only do we need to use materials with excellent anti-corrosion properties, but we also need to perform anti-corrosion treatment on the surface of the aircraft body. Currently, anti-corrosion paints are more commonly used for coating. Among many organic polymer paints, epoxy resin has many advantages such as large output, wide variety, and strong metal adhesion, which makes it show great application potential in the paint field. However, epoxy resin itself is brittle, and its impact resistance and corrosion resistance are not strong, which cannot meet the market requirements for anti-corrosion paints. Therefore, traditional epoxy resins need to be modified. Among the various modification methods currently discovered, inorganic nanomaterial filling or organic polymer material filling modification is the most scientific and effective modification method. By combining the advantages of inorganic nanomaterials and other organic polymer materials, improving the comprehensive properties of epoxy resins such as mechanics and corrosion resistance has become a research hotspot this year.

[0003] Diatomite is a siliceous rock whose main component is silicon dioxide. It has special ion exchange properties, adsorption properties and gas barrier properties. Adding it to organic polymer materials by blending to improve the comprehensive physical properties of organic polymer materials such as mechanics has become a research hotspot in recent years. Chinese patents such as CN108676473A disclose a feasible method of blending diatomite nanoclay into an epoxy resin matrix to form a hybrid composite material. However, these patents only perform simple physical blending, do not improve the dispersibility of diatomite, and do not give diatomite new functionality. Therefore, the modification effect is often poor. Therefore, diatomite can be modified. After treatment, the surface of diatomite will contain a large number of hydroxyl groups. Functional corrosion inhibition molecules such as benzotriazole can be further introduced through hydroxyl groups. The advantages of these functional molecules can be combined to further broaden the application range of diatomite.

[0004] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides a triazole-based diatomaceous earth modified epoxy resin paint and a preparation method thereof, which solves the problem that the epoxy resin paint has weak mechanical and anti-corrosion properties.

[0005] (II) Technical solution To achieve the above object, the present invention provides the following technical solution: a triazole-based diatomite-modified epoxy resin paint, wherein the preparation method of the triazole-based diatomite-modified epoxy resin paint comprises the following steps: (1) Add toluene solvent and diatomaceous earth into a reactor, add 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion, mix well and transfer to an oil bath, stir at a constant temperature of 80-100° C. in a nitrogen atmosphere to react for 12-24 hours, centrifuge, wash and dry after the reaction is completed to obtain epoxidized diatomaceous earth; (2) Add cyclohexane and epoxidized diatomaceous earth to the reactor, and after ultrasonic dispersion for 20-40 minutes, continue to add lignin and sodium hydroxide, mix well, transfer to an oil bath, increase the temperature to 40-60°C, react in a nitrogen atmosphere for 4-12 hours, filter, wash and dry after the reaction to obtain lignin-modified diatomaceous earth; (3) Add tetrahydrofuran and lignin-modified diatomaceous earth into the reactor, disperse them by ultrasonic until they are completely dissolved, continue to add isophorone diisocyanate and catalyst, mix them evenly, transfer them to an oil bath, stir and react at a constant temperature of 50-70°C for 2-8h in a nitrogen atmosphere, centrifuge, wash and dry after the reaction is completed to obtain isocyanate-modified lignin-modified diatomaceous earth; (4) adding anhydrous toluene, ethanol and isocyanate lignin modified diatomaceous earth into the reactor, dispersing them uniformly by ultrasonication, continuing to add benzotriazole and catalyst, mixing them uniformly and transferring them into an oil bath, stirring and reacting them at 80-100° C. for 6-18 hours under nitrogen protection, centrifuging, washing and drying the product after cooling, and obtaining benzotriazole lignin modified diatomaceous earth; (5) Add epoxy resin emulsion, benzotriazole-based lignin modified diatomaceous earth, 0.5-5% of polyacrylate defoamer, 1-4% of polyether defoamer and 20-40% of curing agent polyamide into the reactor, mix well and package to obtain triazole-based diatomaceous earth modified epoxy resin paint.

[0006] Preferably, in step (1), the mass ratio of anhydrous ethanol, diatomaceous earth and 3-glycidyloxypropyltrimethoxysilane is 650-1800:10:0.6-1.5.

[0007] Preferably, in step (2), the mass ratio of cyclohexane, epoxidized diatomaceous earth, lignin and sodium hydroxide is 800-5500:10:10-25:2-6.

[0008] Preferably, in step (3), the mass ratio of tetrahydrofuran, lignin-modified diatomaceous earth, isophorone diisocyanate and catalyst is 350-1000:10:2-6:0.01-0.04.

[0009] Preferably, the catalyst in step (3) is dibutyltin dilaurate (DBTDL).

[0010] Preferably, in step (4), the mass ratio of anhydrous toluene, ethanol, isocyanate-modified lignin-modified diatomaceous earth, benzotriazole and catalyst is 200-750:100-400:10:1-4:0.2-0.6.

[0011] Preferably, the catalyst in step (4) is benzoyl peroxide (BPO).

[0012] Preferably, in step (5), the mass ratio of the epoxy resin emulsion to the benzotriazole-based lignin-modified diatomaceous earth is 100:1-5.

[0013] 3. Beneficial technical effects Compared with the prior art, the present invention has the following beneficial technical effects: The triazole-based diatomite modified epoxy resin paint has a large number of epoxy groups on the surface of diatomite modified by 3-glycidyloxypropyltrimethoxysilane, which can undergo a ring-opening reaction with the hydroxyl group in lignin under the action of sodium hydroxide to obtain lignin-modified diatomite, and under the catalytic action of the catalyst dibutyltin dilaurate, the hydroxyl group on the lignin in the lignin-modified diatomite continues to undergo a carbamate reaction with isophorone diisocyanate to obtain isocyanate-lignin-modified diatomite, which further reacts with the imino group in benzotriazole through the isocyanate group to obtain benzotriazole-based lignin-modified diatomite, thereby effectively utilizing the connection mode of chemical bonds, chemically bonding active functional groups such as epoxy groups, hydroxyl groups and isocyanate groups on the surface of diatomite, and further introducing rigid lignin and benzotriazole corrosion inhibition functional molecules, thereby further expanding the application range of diatomite.

[0014] The triazole-based diatomite-modified epoxy resin paint is prepared by blending benzotriazole-based lignin-modified diatomite with epoxy resin and other additives. Since lignin contains a large amount of hydroxyl groups, it can form an intertwined cross-linked network with epoxy resin through hydrogen bonds, thereby introducing a rigid benzene ring structure into the composite epoxy resin paint matrix, thereby improving the rigidity of the composite epoxy resin to a certain extent. The existence of the cross-linked network prevents the composite epoxy resin paint from breaking due to stress concentration when subjected to external stress. Diatomite, as a rigid nanoparticle, can also It can absorb part of the stress, thereby further improving the mechanical properties of the composite epoxy resin paint, such as bending strength and impact strength. In addition, the special flaky structure of diatomaceous earth can form a physical barrier layer in the matrix to block the invasion of corrosive media such as water and oxygen in the air, while the benzotriazole group can provide a large number of free electrons, forming more coordination bonds with the metal, and forming a stable single-molecule adsorption film on the surface of the matrix, which prevents the corrosive media from invading the interior of the matrix, thereby playing a role in inhibiting corrosion and preventing corrosion. Therefore, by combining the excellent properties of diatomaceous earth and lignin, the problem of poor overall performance of epoxy resin paint is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the reaction principle diagram of epoxidized diatomaceous earth and lignin.

[0016] Figure 2 This is the reaction principle diagram of lignin-modified diatomaceous earth and isophorone diisocyanate.

[0017] Figure 3 This is the reaction principle diagram of isocyanate lignin modified diatomaceous earth and benzotriazole. DETAILED DESCRIPTION

[0018] To achieve the above object, the present invention provides the following embodiment: a triazole-based diatomaceous earth modified epoxy resin paint, the preparation method of which comprises the following steps: Example 1

[0019] (1) Add 75 mL of toluene solvent and 1 g of diatomaceous earth into a reactor, add 0.06 g of 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion, mix well and transfer to an oil bath, stir at 80 ° C in a nitrogen atmosphere to react for 12 h, centrifuge after the reaction, wash and dry to obtain epoxidized diatomaceous earth; (2) Add 110 mL of cyclohexane and 1 g of epoxidized diatomaceous earth into the reactor, and after ultrasonic dispersion for 20 min, continue to add 1 g of lignin and 0.2 g of sodium hydroxide. After mixing evenly, transfer to an oil bath, increase the temperature to 40 ° C, and react for 4 h in a nitrogen atmosphere. After the reaction is completed, filter, wash and dry to obtain lignin-modified diatomaceous earth; (3) Add 40 mL of tetrahydrofuran and 1 g of lignin-modified diatomaceous earth into the reactor, disperse by ultrasonic until completely dissolved, continue to add 0.2 g of isophorone diisocyanate and 0.001 g of dibutyltin dilaurate, mix well, transfer to an oil bath, stir and react at a constant temperature of 50 ° C for 2 h in a nitrogen atmosphere, centrifuge after the reaction is completed, wash and dry to obtain isocyanate-modified lignin diatomaceous earth; (4) Add 24 mL of anhydrous toluene, 15 mL of ethanol and 1 g of isocyanate lignin modified diatomaceous earth into the reactor, disperse them evenly by ultrasonication, continue to add 0.1 g of benzotriazole and 0.02 g of benzoyl peroxide, mix evenly and transfer to an oil bath, stir and react at 80 ° C for 6 h under nitrogen protection, centrifuge, wash and dry the product after cooling to obtain benzotriazole lignin modified diatomaceous earth; (5) Add 100 g of epoxy resin emulsion, 1 g of benzotriazole-based lignin-modified diatomaceous earth, 0.5% of polyacrylate defoamer, 1% of polyether defoamer and 20% of curing agent polyamide into a reactor, mix well and package to obtain triazole-based diatomaceous earth-modified epoxy resin paint.

[0020] Example 2

[0021] (1) Add 100 mL of toluene solvent and 1 g of diatomaceous earth into a reactor, add 0.08 g of 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion, mix well and transfer to an oil bath, react at 85 ° C in a nitrogen atmosphere with constant temperature stirring for 16 hours, centrifuge, wash and dry after the reaction to obtain epoxidized diatomaceous earth; (2) Add 200 mL of cyclohexane and 1 g of epoxidized diatomaceous earth into the reactor, and after ultrasonic dispersion for 25 min, continue to add 1 g of lignin and 0.3 g of sodium hydroxide. After mixing evenly, transfer to an oil bath pot, increase the temperature to 45 ° C, and react for 6 h in a nitrogen atmosphere. After the reaction is completed, filter, wash and dry to obtain lignin-modified diatomaceous earth; (3) Add 60 mL of tetrahydrofuran and 1 g of lignin-modified diatomaceous earth into the reactor, disperse by ultrasonic until completely dissolved, continue to add 0.3 g of isophorone diisocyanate and 0.002 g of dibutyltin dilaurate, mix well, transfer to an oil bath, stir and react at a constant temperature of 55 ° C for 4 h in a nitrogen atmosphere, centrifuge after the reaction is completed, wash and dry to obtain isocyanate-modified lignin diatomaceous earth; (4) Add 35 mL of anhydrous toluene, 20 mL of ethanol and 1 g of isocyanate lignin modified diatomaceous earth into the reactor, disperse them evenly by ultrasonication, continue to add 0.2 g of benzotriazole and 0.03 g of benzoyl peroxide, mix evenly and transfer to an oil bath, stir and react at 85 ° C for 8 h under nitrogen protection, cool the product, centrifuge, wash and dry to obtain benzotriazole lignin modified diatomaceous earth; (5) Add 100 g of epoxy resin emulsion, 2 g of benzotriazole-based lignin-modified diatomaceous earth, 2% of polyacrylate defoamer, 1.5% of polyether defoamer and 25% of curing agent polyamide into a reactor, mix well and package to obtain triazole-based diatomaceous earth-modified epoxy resin paint.

[0022] Example 3

[0023] (1) Add 150 mL of toluene solvent and 1 g of diatomaceous earth into a reactor, add 0.1 g of 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion, mix well and transfer to an oil bath, react at 80 ° C in a nitrogen atmosphere for 18 hours, centrifuge after the reaction, wash and dry to obtain epoxidized diatomaceous earth; (2) Add 400 mL of cyclohexane and 1 g of epoxidized diatomaceous earth into the reactor, and after ultrasonic dispersion for 30 min, continue to add 1 g of lignin and 0.4 g of sodium hydroxide. After mixing evenly, transfer to an oil bath pot, increase the temperature to 50 ° C, and react for 8 h in a nitrogen atmosphere. After the reaction is completed, filter, wash and dry to obtain lignin-modified diatomaceous earth; (3) Add 80 mL of tetrahydrofuran and 1 g of lignin-modified diatomaceous earth into the reactor, disperse by ultrasonic until completely dissolved, continue to add 0.4 g of isophorone diisocyanate and 0.003 g of dibutyltin dilaurate, mix well, transfer to an oil bath, stir and react at a constant temperature of 60 ° C for 6 h in a nitrogen atmosphere, centrifuge after the reaction is completed, wash and dry to obtain isocyanate-modified lignin diatomaceous earth; (4) Add 55 mL of anhydrous toluene, 30 mL of ethanol and 1 g of isocyanate lignin modified diatomaceous earth into the reactor, disperse them evenly by ultrasonication, continue to add 0.3 g of benzotriazole and 0.04 g of benzoyl peroxide, mix evenly and transfer to an oil bath, stir and react at 90 ° C for 9 h under nitrogen protection, centrifuge, wash and dry the product after cooling to obtain benzotriazole lignin modified diatomaceous earth; (5) Add 100 g of epoxy resin emulsion, 3 g of benzotriazole-based lignin-modified diatomaceous earth, 3% of polyacrylate defoamer, 2% of polyether defoamer and 30% of curing agent polyamide into a reactor, mix well and package to obtain triazole-based diatomaceous earth-modified epoxy resin paint.

[0024] Example 4

[0025] (1) Add 180 mL of toluene solvent and 1 g of diatomaceous earth into a reactor, add 0.12 g of 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion, mix well and transfer to an oil bath, react at 85 ° C in a nitrogen atmosphere for 20 h, centrifuge, wash and dry after the reaction to obtain epoxidized diatomaceous earth; (2) Add 600 mL of cyclohexane and 1 g of epoxidized diatomaceous earth into the reactor, and after ultrasonic dispersion for 35 min, continue to add 1 g of lignin and 0.5 g of sodium hydroxide. After mixing evenly, transfer to an oil bath, increase the temperature to 55 ° C, and react for 9 h in a nitrogen atmosphere. After the reaction is completed, filter, wash and dry to obtain lignin-modified diatomaceous earth; (3) Add 100 mL of tetrahydrofuran and 1 g of lignin-modified diatomaceous earth into the reactor, disperse by ultrasonic until completely dissolved, continue to add 0.5 g of isophorone diisocyanate and 0.003 g of dibutyltin dilaurate, mix well, transfer to an oil bath, stir and react at a constant temperature of 65 ° C for 7 h in a nitrogen atmosphere, centrifuge after the reaction is completed, wash and dry to obtain isocyanate-modified lignin diatomaceous earth; (4) Add 70 mL of anhydrous toluene, 40 mL of ethanol and 1 g of isocyanate lignin modified diatomaceous earth into the reactor, disperse them evenly by ultrasonication, continue to add 0.3 g of benzotriazole and 0.05 g of benzoyl peroxide, mix evenly and transfer to an oil bath, stir and react at 95 ° C for 12 h under nitrogen protection, centrifuge, wash and dry the product after cooling to obtain benzotriazole lignin modified diatomaceous earth; (5) Add 100 g of epoxy resin emulsion, 4 g of benzotriazole-based lignin-modified diatomaceous earth, 4% of polyacrylate defoamer, 3% of polyether defoamer and 35% of curing agent polyamide into a reactor, mix well and package to obtain triazole-based diatomaceous earth-modified epoxy resin paint.

[0026] Example 5

[0027] (1) Add 210 mL of toluene solvent and 1 g of diatomaceous earth into a reactor, add 0.15 g of 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion, mix well and transfer to an oil bath, react at 90 ° C in a nitrogen atmosphere with constant temperature stirring for 24 hours, centrifuge after the reaction, wash and dry to obtain epoxidized diatomaceous earth; (2) Add 700 mL of cyclohexane and 1 g of epoxidized diatomaceous earth into the reactor, and after ultrasonic dispersion for 40 min, continue to add 1 g of lignin and 0.6 g of sodium hydroxide. After mixing evenly, transfer to an oil bath, increase the temperature to 60 ° C, and react in a nitrogen atmosphere for 12 h. After the reaction is completed, filter, wash and dry to obtain lignin-modified diatomaceous earth; (3) Add 110 mL of tetrahydrofuran and 1 g of lignin-modified diatomaceous earth into the reactor, disperse by ultrasonic until completely dissolved, continue to add 0.6 g of isophorone diisocyanate and 0.004 g of dibutyltin dilaurate, mix well, transfer to an oil bath, stir and react at a constant temperature of 70 ° C for 8 h in a nitrogen atmosphere, centrifuge after the reaction is completed, wash and dry to obtain isocyanate-modified lignin diatomaceous earth; (4) Add 85 mL of anhydrous toluene, 50 mL of ethanol and 1 g of isocyanate lignin modified diatomaceous earth into the reactor, disperse them evenly by ultrasonication, continue to add 0.4 g of benzotriazole and 0.06 g of benzoyl peroxide, mix evenly and transfer to an oil bath, stir and react at 100 ° C for 18 h under nitrogen protection, centrifuge, wash and dry the product after cooling to obtain benzotriazole lignin modified diatomaceous earth; (5) Add 100 g of epoxy resin emulsion, 5 g of benzotriazole-based lignin-modified diatomaceous earth, 5% of polyacrylate defoamer, 4% of polyether defoamer and 40% of curing agent polyamide into a reactor, mix well and package to obtain triazole-based diatomaceous earth-modified epoxy resin paint.

[0028] Comparative Example 1 (1) Add 100 mL of toluene solvent and 1 g of diatomaceous earth into a reactor, add 0.08 g of 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion, mix well and transfer to an oil bath, stir at a constant temperature of 75 ° C in a nitrogen atmosphere to react for 16 hours, centrifuge, wash and dry after the reaction to obtain epoxidized diatomaceous earth; (2) Add 200 mL of cyclohexane and 1 g of epoxidized diatomaceous earth into the reactor, and after ultrasonic dispersion for 25 min, continue to add 1 g of lignin and 0.3 g of sodium hydroxide. After mixing evenly, transfer to an oil bath pot, increase the temperature to 45 ° C, and react for 6 h in a nitrogen atmosphere. After the reaction is completed, filter, wash and dry to obtain lignin-modified diatomaceous earth; (3) Add 100 g of epoxy resin emulsion, 1.5 g of lignin-modified diatomaceous earth, 2% of polyacrylate defoamer, 1.5% of polyether defoamer and 25% of curing agent polyamide into the reactor, mix well and package to obtain diatomaceous earth-modified epoxy resin paint.

[0029] The composite paints in the examples and comparative examples were placed in a mold for curing, and the cured paints were prepared into coatings with specifications of 4 mm×5 cm×5 cm. The tensile strength and elongation at break of the composite coatings were tested using a HY-963 impact strength tester.

[0030] The composite paint in the embodiment and the comparative example was evenly coated on the surface of the stainless steel electrode, cured at 80°C, and used as the working electrode, a platinum electrode as the auxiliary electrode, a calomel electrode as the reference electrode, and a 4% sodium chloride solution as the electrolyte. The corrosion current density and corrosion potential were tested using a PGSTAT 302N electrochemical workstation.

Claims

1. A triazole-based diatomaceous earth modified epoxy resin paint, characterized in that: The following steps are involved: (1) Add diatomaceous earth to toluene solvent, and then add 3-glycidyloxypropyltrimethoxysilane after ultrasonic dispersion. After mixing evenly, transfer to an oil bath pot, and react at a constant temperature of 80-100° C. in a nitrogen atmosphere with stirring for 12-24 hours. After the reaction, centrifuge, wash and dry to obtain epoxidized diatomaceous earth; (2) Add epoxidized diatomaceous earth to cyclohexane solvent, ultrasonically disperse for 20-40 minutes, then continue to add lignin and sodium hydroxide, mix well, transfer to an oil bath, increase the temperature to 40-60°C, react in a nitrogen atmosphere for 4-12 hours, filter, wash and dry after the reaction is completed to obtain lignin-modified diatomaceous earth; (3) Add lignin-modified diatomaceous earth to tetrahydrofuran solvent, disperse by ultrasonic until completely dissolved, continue to add isophorone diisocyanate and catalyst, mix well, transfer to an oil bath, stir and react at a constant temperature of 50-70° C. for 2-8 hours in a nitrogen atmosphere, centrifuge after the reaction, wash and dry to obtain isocyanate-modified lignin diatomaceous earth; (4) adding isocyanate lignin modified diatomite to a mixed solvent of anhydrous toluene and ethanol, uniformly dispersing by ultrasonication, continuing to add benzotriazole and a catalyst, mixing uniformly and transferring to an oil bath, stirring and reacting at 80-100° C. for 6-18 hours under nitrogen protection, centrifuging, washing and drying the product after cooling, and obtaining benzotriazole lignin modified diatomite; (5) Add epoxy resin emulsion, benzotriazole-based lignin modified diatomaceous earth, 0.5-5% of polyacrylate defoamer, 1-4% of polyether defoamer and 20-40% of curing agent polyamide into the reactor, mix well and package to obtain triazole-based diatomaceous earth modified epoxy resin paint.

2. The triazole-based diatomite-modified epoxy resin paint according to claim 1, characterized in that: In the step (1), the mass ratio of anhydrous ethanol, diatomaceous earth and 3-glycidyloxypropyltrimethoxysilane is 650-1800:10:0.6-1.

5.

3. The triazole-based diatomite-modified epoxy resin paint according to claim 1, characterized in that: In the step (2), the mass ratio of cyclohexane, epoxidized diatomaceous earth, lignin and sodium hydroxide is 800-5500:10:10-25:2-6.

4. The triazole-based diatomite-modified epoxy resin paint according to claim 1, characterized in that: In the step (3), the mass ratio of tetrahydrofuran, lignin-modified diatomaceous earth, isophorone diisocyanate and catalyst is 350-1000:10:2-6:0.01-0.

04.

5. The triazole-based diatomite-modified epoxy resin paint according to claim 1, characterized in that: The catalyst in step (3) is dibutyltin dilaurate.

6. The triazole-based diatomite-modified epoxy resin paint according to claim 1, characterized in that: In the step (4), the mass ratio of anhydrous toluene, ethanol, isocyanate-modified lignin-modified diatomaceous earth, benzotriazole and catalyst is 200-750:100-400:10:1-4:0.2-0.

6.

7. The triazole-based diatomite-modified epoxy resin paint according to claim 1, characterized in that: The catalyst in step (4) is benzoyl peroxide.

8. The triazole-based diatomite-modified epoxy resin paint according to claim 1, characterized in that: In the step (5), the mass ratio of the epoxy resin emulsion to the benzotriazole-based lignin-modified diatomaceous earth is 100:1-5.

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