Preparation process and application of salt spray resistant, corrosion resistant and wear resistant coating

Abstract

The present invention relates to the technical field of coatings, and discloses a preparation process and application of a salt spray resistant anticorrosion and wear-resistant coating. The present invention obtains a salt spray resistant anticorrosion and wear-resistant coating by coating a non-metallic coating on a first layer, drying, then coating a metal coating, drying, and finally coating a non-metallic coating. The phosphorus element contained in the modified phenolic resin and the quaternary ammonium salt modified cyclotriphosphazene can generate polyphosphoric acid and metaphosphoric acid with strong dehydration, so that the material is dehydrated and carbonized, thereby achieving a flame retardant effect. The quaternary ammonium salt and imidazole group contained therein have good anticorrosion and antibacterial effects, and after 1-(2-hydroxyethyl) imidazole and hexaglycidyl cyclotriphosphazene react, the substitution degree of imidazole is increased, so that the antibacterial group is more; the phenolic resin itself has good wear resistance, and it is added to the coating to improve its wear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a preparation process and application of a salt spray resistant, corrosion resistant and wear resistant coating. Background Art

[0002] Wear and corrosion are the pain points that plague the long-term stable operation of equipment. Equipment that is worn and corroded will not only reduce its service life, but also bring safety hazards. If a fire occurs, the surface of the equipment will burn, which will also affect its normal use. Therefore, how to avoid this phenomenon is the key to solving the problem. For example, patent CN117586690B discloses a two-component spray polyurea waterproof coating. The spray polyurea waterproof coating obtained by the invention has good waterproofness and tensile strength, but its flame retardant, antiseptic, antibacterial and wear resistance properties are not improved. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides a preparation process and application of a salt spray resistant, corrosion resistant and wear resistant coating, which has salt spray resistance, flame retardancy, corrosion resistance, antibacterial and wear resistance, and also has a frosting effect.

[0005] (II) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solution: a preparation process of a salt spray resistant, corrosion resistant and wear resistant coating, wherein the preparation process of the salt spray resistant, corrosion resistant and wear resistant coating is:

[0007] (1) Add hexachlorocyclotriphosphazene to a reactor containing toluene solvent, introduce nitrogen at room temperature, stir to dissolve, then add glycidol, mix and stir, then slowly add triethylamine catalyst, react at 40-50° C. for 2-4 hours, filter, remove the solvent by vacuum filtration, dissolve the obtained crude product in dichloromethane, wash with deionized water, and again remove dichloromethane by vacuum filtration to obtain hexaglycidyl cyclotriphosphazene;

[0008] (2) adding hexaglycidyl cyclotriphosphazene to 1,4-dioxane, and adding 1-(2-hydroxyethyl)imidazole and boron trifluoride ether catalyst after uniform dispersion, reacting at 60-100° C. for 8-12 hours, filtering, washing and drying to obtain imidazole-modified cyclotriphosphazene;

[0009] (3) Add 7-12 parts by weight of imidazole-modified cyclotriphosphazene and 10-18 parts by weight of chloroacetic acid to N,N-dimethylformamide solvent, stir to dissolve, react at 75-100° C. for 7-15 hours, and then distill under reduced pressure, wash and dry to obtain an intermediate;

[0010] (4) adding the intermediate and pentaerythritol phosphate to N,N-dimethylformamide solvent, stirring and mixing, and continuously adding p-toluenesulfonic acid catalyst thereto, reacting at 90-110° C. for 5-10 hours, and then rotary distilling, filtering, and washing to obtain quaternary ammonium salt-modified cyclotriphosphazene;

[0011] (5) Add thionyl chloride and the intermediate into the reactor, react at 60-75°C for 2-6 hours, cool after reaction, concentrate under reduced pressure, wash the product with petroleum ether, and dry to obtain an acyl chloride intermediate;

[0012] (6) Add phenolic resin and acyl chloride intermediate to acetone solvent, stir and mix, continue to add triethylamine catalyst, react at 75-90° C. for 8-16 hours, cool to room temperature after reaction, filter, wash and dry to obtain modified phenolic resin;

[0013] (7) Add 15-35 parts by weight of talc, 4-6 parts by weight of quaternary ammonium salt modified cyclotriphosphazene, 3-7 parts by weight of modified phenolic resin, 1-2 parts by weight of 731A dispersant, 0.8-1.2 parts by weight of BYK-345 leveling agent, and 1-3 parts by weight of water into a stirrer, stir for 12-15 minutes, and obtain a non-metallic coating; add 10-20 parts by weight of calcium oxide, 80-90 parts by weight of nano silicon dioxide, 40-70 parts by weight of nano titanium dioxide, 35-40 parts of zinc, and 10-15 parts by weight of water into a stirrer, stir for 12-15 minutes, and obtain a metal coating; apply the non-metallic coating on the first layer, dry it, then apply the metal coating, dry it again, and finally apply the non-metallic coating to obtain a salt spray resistant, corrosion resistant and wear resistant coating.

[0014] Preferably, the mass ratio of hexachlorocyclotriphosphazene, glycidol and triethylamine catalyst in (1) is 1:3.6-5:0.01-0.02.

[0015] Preferably, the mass ratio of hexaglycidyl cyclotriphosphazene, 1-(2-hydroxyethyl)imidazole and boron trifluoride etherate catalyst in (2) is 0.6-0.8:1:0.02-0.04.

[0016] Preferably, the mass ratio of the intermediate, pentaerythritol phosphate and p-toluenesulfonic acid catalyst in (4) is 1:1.1-1.3:0.01-0.03.

[0017] Preferably, the mass ratio of thionyl chloride to the intermediate in (5) is 1.4-2:1.

[0018] Preferably, the mass ratio of the phenolic resin, the acyl chloride intermediate and the triethylamine catalyst in (6) is 1:2.4-3.2:0.02-0.03.

[0019] Preferably, the application in a device.

[0020] 3. Beneficial technical effects

[0021] The invention comprises the following steps: adding talcum powder, quaternary ammonium salt modified cyclotriphosphazene, modified phenolic resin, 731A dispersant, BYK-345 leveling agent and water into a stirrer, stirring, and obtaining a non-metallic coating; adding calcium oxide, nano silicon dioxide, nano titanium dioxide, zinc and water into the stirrer, stirring, and obtaining a metal coating; coating the non-metallic coating on a first layer, drying, coating the metal coating, drying, and finally coating the non-metallic coating to obtain a salt spray resistant, corrosion resistant and wear resistant coating.

[0022] The hexachlorocyclotriphosphazene and glycidol are subjected to substitution reaction to obtain hexaglycidyl cyclotriphosphazene, which is then subjected to addition reaction with the hydroxyl group in 1-(2-hydroxyethyl)imidazole to introduce an imidazole group and generate a new hydroxyl group, thereby obtaining an imidazole-modified cyclotriphosphazene. The imidazole in the imidazole-modified cyclotriphosphazene is reacted with the chlorine in chloroacetic acid to generate a quaternary ammonium salt group and introduce a carboxyl group to obtain an intermediate. The carboxyl group in the intermediate is subjected to esterification reaction with the hydroxyl group in pentaerythritol phosphate to obtain a quaternary ammonium salt-modified cyclotriphosphazene. Sulfonyl chloride is reacted with the intermediate to obtain an acyl chloride intermediate. The phenolic resin is reacted with the acyl chloride intermediate to obtain a modified phenolic resin.

[0023] The salt spray resistant, anti-corrosion and wear-resistant coating of the present invention has good salt spray resistance, flame retardant, anti-corrosion, anti-bacterial and wear resistance. The phosphorus element contained in the modified phenolic resin and the quaternary ammonium salt modified cyclotriphosphazene can generate polyphosphoric acid and metaphosphoric acid with strong dehydration properties, so that the material is dehydrated and carbonized. Since the polyphosphoric acid and metaphosphoric acid are not easy to volatilize, a dense protective layer can be formed on the surface of the polymer, which can isolate the contact between oxygen and the material, thereby achieving a flame retardant effect. The quaternary ammonium salt and imidazole group contained therein have good anti-corrosion and anti-bacterial effects, and after 1-(2-hydroxyethyl) imidazole and hexaglycidyl cyclotriphosphazene react, the substitution degree of imidazole is increased, so that the antibacterial group is more; the phenolic resin itself has good wear resistance, and it is added to the coating to improve its wear resistance. DETAILED DESCRIPTION

[0024] Example 1

[0025] (1) Add hexachlorocyclotriphosphazene to a reactor containing toluene solvent, introduce nitrogen at room temperature, stir to dissolve, then add glycidol, mix and stir, and then slowly add triethylamine catalyst, wherein the mass ratio of hexachlorocyclotriphosphazene, glycidol and triethylamine catalyst is 1:3.6:0.01, react at 40° C. for 2 hours, filter, remove the solvent by vacuum filtration, dissolve the obtained crude product in dichloromethane, wash with deionized water, and remove dichloromethane by vacuum filtration again to obtain hexaglycidyl cyclotriphosphazene;

[0026] (2) Add hexaglycidyl cyclotriphosphazene to 1,4-dioxane, disperse evenly, add 1-(2-hydroxyethyl)imidazole and boron trifluoride ether catalyst, wherein the mass ratio of hexaglycidyl cyclotriphosphazene, 1-(2-hydroxyethyl)imidazole and boron trifluoride ether catalyst is 0.6:1:0.02, react at 60°C for 8h, filter, wash and dry to obtain imidazole-modified cyclotriphosphazene;

[0027] (3) Add 7 parts by weight of imidazole-modified cyclotriphosphazene and 10 parts by weight of chloroacetic acid to N,N-dimethylformamide solvent, stir to dissolve, react at 75° C. for 7 h, and then distill under reduced pressure, wash and dry to obtain an intermediate;

[0028] (4) adding the intermediate and pentaerythritol phosphate to N,N-dimethylformamide solvent, stirring and mixing, and continuously adding p-toluenesulfonic acid catalyst thereto, wherein the mass ratio of the intermediate, pentaerythritol phosphate, and p-toluenesulfonic acid catalyst is 1:1.1:0.01, reacting at 90° C. for 5 h, and then rotary distilling, filtering, and washing to obtain quaternary ammonium salt-modified cyclotriphosphazene;

[0029] (5) Add thionyl chloride and the intermediate into the reactor, wherein the mass ratio of thionyl chloride to the intermediate is 1.4:1, react at 60°C for 2 hours, cool after reaction, concentrate under reduced pressure, wash the product with petroleum ether, and dry to obtain an acyl chloride intermediate;

[0030] (6) Add phenolic resin and acyl chloride intermediate to acetone solvent, stir and mix, and continue to add triethylamine catalyst, wherein the mass ratio of phenolic resin, acyl chloride intermediate and triethylamine catalyst is 1:2.4:0.02, react at 75°C for 8h, cool to room temperature after reaction, filter, wash and dry to obtain modified phenolic resin;

[0031] (7) Add 15 parts by weight of talcum powder, 4 parts by weight of quaternary ammonium salt modified cyclotriphosphazene, 3 parts by weight of modified phenolic resin, 1 part by weight of 731A dispersant, 0.8 parts by weight of BYK-345 leveling agent, and 1 part by weight of water into a stirrer and stir for 12 minutes to obtain a non-metallic coating; add 10 parts by weight of calcium oxide, 80 parts by weight of nano silicon dioxide, 40 parts by weight of nano titanium dioxide, 35 parts by weight of zinc, and 10 parts by weight of water into a stirrer and stir for 12 minutes to obtain a metal coating; apply the non-metallic coating as the first layer, dry it, then apply the metal coating, dry it again, and finally apply the non-metallic coating to obtain a salt spray resistant, corrosion resistant and wear resistant coating.

[0032] Example 2

[0033] (1) Add hexachlorocyclotriphosphazene to a reactor containing toluene solvent, introduce nitrogen at room temperature, stir to dissolve, then add glycidol, mix and stir, and then slowly add triethylamine catalyst, wherein the mass ratio of hexachlorocyclotriphosphazene, glycidol and triethylamine catalyst is 1:5:0.02, react at 50° C. for 4 hours, filter, remove the solvent by vacuum filtration, dissolve the obtained crude product in dichloromethane, wash with deionized water, and remove dichloromethane by vacuum filtration again to obtain hexaglycidyl cyclotriphosphazene;

[0034] (2) adding hexaglycidyl cyclotriphosphazene to 1,4-dioxane, and adding 1-(2-hydroxyethyl)imidazole and boron trifluoride ether catalyst after uniform dispersion, wherein the mass ratio of hexaglycidyl cyclotriphosphazene, 1-(2-hydroxyethyl)imidazole, and boron trifluoride ether catalyst is 0.8:1:0.04, reacting at 100°C for 12h, filtering, washing and drying to obtain imidazole-modified cyclotriphosphazene;

[0035] (3) Add 12 parts by weight of imidazole-modified cyclotriphosphazene and 10-18 parts by weight of chloroacetic acid to N,N-dimethylformamide solvent, stir to dissolve, react at 100° C. for 15 h, and then distill under reduced pressure, wash and dry to obtain an intermediate;

[0036] (4) adding the intermediate and pentaerythritol phosphate to N,N-dimethylformamide solvent, stirring and mixing, and continuously adding p-toluenesulfonic acid catalyst thereto, wherein the mass ratio of the intermediate, pentaerythritol phosphate, and p-toluenesulfonic acid catalyst is 1:1.3:0.03, reacting at 110° C. for 10 h, and then rotary distilling, filtering, and washing to obtain quaternary ammonium salt-modified cyclotriphosphazene;

[0037] (5) Add thionyl chloride and the intermediate into the reactor, wherein the mass ratio of thionyl chloride to the intermediate is 2:1, react at 75°C for 6 hours, cool after reaction, concentrate under reduced pressure, wash the product with petroleum ether, and dry to obtain an acyl chloride intermediate;

[0038] (6) Add phenolic resin and acyl chloride intermediate to acetone solvent, stir and mix, and continue to add triethylamine catalyst, wherein the mass ratio of phenolic resin, acyl chloride intermediate and triethylamine catalyst is 1:3.2:0.03, react at 90° C. for 16 hours, cool to room temperature after reaction, filter, wash and dry to obtain modified phenolic resin;

[0039] (7) Add 35 parts by weight of talcum powder, 6 parts by weight of quaternary ammonium salt modified cyclotriphosphazene, 7 parts by weight of modified phenolic resin, 2 parts by weight of 731A dispersant, 1.2 parts by weight of BYK-345 leveling agent, and 3 parts by weight of water into a stirrer and stir for 15 minutes to obtain a non-metallic coating; add 20 parts by weight of calcium oxide, 90 parts by weight of nano silicon dioxide, 70 parts by weight of nano titanium dioxide, 40 parts by weight of zinc, and 15 parts by weight of water into a stirrer and stir for 15 minutes to obtain a metal coating; apply the non-metallic coating as the first layer, dry it, then apply the metal coating, dry it again, and finally apply the non-metallic coating to obtain a salt spray resistant, corrosion resistant and wear resistant coating.

[0040] Example 3

[0041] (1) Add hexachlorocyclotriphosphazene to a reactor containing toluene solvent, introduce nitrogen at room temperature, stir to dissolve, then add glycidol, mix and stir, and then slowly add triethylamine catalyst, wherein the mass ratio of hexachlorocyclotriphosphazene, glycidol and triethylamine catalyst is 1:4.2:0.015, react at 45° C. for 3 hours, filter, remove the solvent by vacuum filtration, dissolve the obtained crude product in dichloromethane, wash with deionized water, and remove dichloromethane by vacuum filtration again to obtain hexaglycidyl cyclotriphosphazene;

[0042] (2) Add hexaglycidyl cyclotriphosphazene to 1,4-dioxane, and after uniform dispersion, add 1-(2-hydroxyethyl)imidazole and boron trifluoride ether catalyst, wherein the mass ratio of hexaglycidyl cyclotriphosphazene, 1-(2-hydroxyethyl)imidazole, and boron trifluoride ether catalyst is 0.7:1:0.03, react at 80°C for 10 hours, filter, wash and dry to obtain imidazole-modified cyclotriphosphazene;

[0043] (3) Add 9.5 parts by weight of imidazole-modified cyclotriphosphazene and 14 parts by weight of chloroacetic acid to N,N-dimethylformamide solvent, stir to dissolve, react at 87° C. for 11 h, and then distill under reduced pressure, wash and dry to obtain an intermediate;

[0044] (4) adding the intermediate and pentaerythritol phosphate to N,N-dimethylformamide solvent, stirring and mixing, and continuously adding p-toluenesulfonic acid catalyst thereto, wherein the mass ratio of the intermediate, pentaerythritol phosphate, and p-toluenesulfonic acid catalyst is 1:1.2:0.02, reacting at 100° C. for 7.5 h, and then rotary distilling, filtering, and washing to obtain quaternary ammonium salt-modified cyclotriphosphazene;

[0045] (5) Add thionyl chloride and the intermediate into the reactor, wherein the mass ratio of thionyl chloride to the intermediate is 1.7:1, react at 70°C for 46 hours, cool after reaction, concentrate under reduced pressure, wash the product with petroleum ether, and dry to obtain an acyl chloride intermediate;

[0046] (6) Add phenolic resin and acyl chloride intermediate to acetone solvent, stir and mix, and continue to add triethylamine catalyst, wherein the mass ratio of phenolic resin, acyl chloride intermediate and triethylamine catalyst is 1:2.8:0.025, react at 82°C for 12 hours, cool to room temperature after reaction, filter, wash and dry to obtain modified phenolic resin;

[0047] (7) Add 25 parts by weight of talcum powder, 5 parts by weight of quaternary ammonium salt modified cyclotriphosphazene, 5 parts by weight of modified phenolic resin, 1.5 parts by weight of 731A dispersant, 1.0 parts by weight of BYK-345 leveling agent, and 2 parts by weight of water into a stirrer and stir for 13.5 minutes to obtain a non-metallic coating; add 15 parts by weight of calcium oxide, 85 parts by weight of nano silicon dioxide, 55 parts by weight of nano titanium dioxide, 38.5 parts by weight of zinc, and 12.5 parts by weight of water into a stirrer and stir for 13.5 minutes to obtain a metal coating; apply the non-metallic coating as a first layer, dry it, then apply the metal coating, dry it again, and finally apply the non-metallic coating to obtain a salt spray resistant, corrosion resistant and wear resistant coating.

[0048] Comparative Example 1

[0049] Compared with Example 3, this comparative example does not add quaternary ammonium salt to modify the cyclotriphosphazene.

[0050] Comparative Example 2

[0051] Compared with Example 3, this comparative example does not add modified phenolic resin.

[0052] The oxygen index meter was used to test the limiting oxygen index of the coating, and the horizontal and vertical combustion instrument was used to test the combustion grade of the coating. The test results are shown in Table 1.

[0053] Table 1: Flame retardancy tests.

[0054]

[0055] It can be seen from Table 1 that Examples 1-3 of the present invention have better flame retardant effects than Comparative Examples 1-2.

[0056] The salt spray resistance test was carried out in accordance with GB / T1735. The test results are shown in Table 2.

[0057] Table 2: Salt spray resistance test.

[0058] project Salt spray resistance (h) Example 1 850 Example 2 900 Example 3 860 Comparative Example 1 531 Comparative Example 2 510

[0059] It can be seen from Table 2 that Examples 1-3 of the present invention have better salt spray resistance than Comparative Examples 1-2.

[0060] The wear resistance test was carried out in accordance with GB / T 23988-2009 “Determination of the wear resistance of coatings - falling sand method”.

[0061] Table 3: Abrasion resistance test.

[0062] project Wear resistance (L / um) Example 1 3.18 Example 2 3.22 Example 3 3.19 Comparative Example 1 1.61 Comparative Example 2 1.62

[0063] It can be seen from Table 3 that the salt spray resistant, corrosion resistant and wear resistant coatings prepared in Examples 1-3 of the present invention have better wear resistance than those in Comparative Examples 1-2.

[0064] Pipette 1 mL of 10 8 CFU / mL of Staphylococcus aureus was added to PBS buffer, and then diluted 10-fold to 10 5 CFU / mL, then add the salt spray resistant anti-corrosion and wear-resistant coating sample (1 cm×1cm×0.2mm), and then culture it in a constant temperature incubator at 37 ℃ with shaking for 24 h. After culture, add PBS buffer to dilute the bacterial solution 10 times in sequence, and then transfer 0.5 mL of the bacterial solution to inoculate into the agar medium, and continue to culture it at 37 ℃ with shaking for 24 h. After culture, count the colonies and count the antibacterial rate.

[0065] Table 4: Antibacterial performance test.

[0066] project Antibacterial rate (%) Example 1 98.5 Example 2 99.7 Example 3 98.6 Comparative Example 1 81.3 Comparative Example 2 82.7

[0067] It can be seen from Table 4 that Examples 1-3 of the present invention have better antibacterial effects than Comparative Examples 1-2.

[0068] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A preparation process for a salt spray resistant, corrosion resistant and wear resistant coating, characterized in that: The preparation process of the salt spray resistant, corrosion resistant and wear resistant coating is as follows: (1) Add hexachlorocyclotriphosphazene to a reactor containing toluene solvent, introduce nitrogen at room temperature, stir to dissolve, then add glycidol, mix and stir, then slowly add triethylamine catalyst, react at 40-50° C. for 2-4 hours, filter, remove the solvent by vacuum filtration, dissolve the obtained crude product in dichloromethane, wash with deionized water, and again remove dichloromethane by vacuum filtration to obtain hexaglycidyl cyclotriphosphazene; (2) adding hexaglycidyl cyclotriphosphazene to 1,4-dioxane, and adding 1-(2-hydroxyethyl)imidazole and boron trifluoride ether catalyst after uniform dispersion, reacting at 60-100° C. for 8-12 hours, filtering, washing and drying to obtain imidazole-modified cyclotriphosphazene; (3) Add 7-12 parts by weight of imidazole-modified cyclotriphosphazene and 10-18 parts by weight of chloroacetic acid to N,N-dimethylformamide solvent, stir to dissolve, react at 75-100° C. for 7-15 hours, and then distill under reduced pressure, wash and dry to obtain an intermediate; (4) adding the intermediate and pentaerythritol phosphate to N,N-dimethylformamide solvent, stirring and mixing, and continuously adding p-toluenesulfonic acid catalyst thereto, reacting at 90-110° C. for 5-10 hours, and then rotary distilling, filtering, and washing to obtain quaternary ammonium salt-modified cyclotriphosphazene; (5) Add thionyl chloride and the intermediate into the reactor, react at 60-75°C for 2-6 hours, cool after reaction, concentrate under reduced pressure, wash the product with petroleum ether, and dry to obtain an acyl chloride intermediate; (6) Add phenolic resin and acyl chloride intermediate to acetone solvent, stir and mix, continue to add triethylamine catalyst, react at 75-90° C. for 8-16 hours, cool to room temperature after reaction, filter, wash and dry to obtain modified phenolic resin; (7) Add 15-35 parts by weight of talc, 4-6 parts by weight of quaternary ammonium salt modified cyclotriphosphazene, 3-7 parts by weight of modified phenolic resin, 1-2 parts by weight of 731A dispersant, 0.8-1.2 parts by weight of BYK-345 leveling agent, and 1-3 parts by weight of water into a stirrer, stir for 12-15 minutes, and obtain a non-metallic coating; add 10-20 parts by weight of calcium oxide, 80-90 parts by weight of nano silicon dioxide, 40-70 parts by weight of nano titanium dioxide, 35-40 parts by weight of zinc, and 10-15 parts by weight of water into a stirrer, stir for 12-15 minutes, and obtain a metal coating; apply the non-metallic coating on the first layer, dry it, then apply the metal coating, dry it again, and finally apply the non-metallic coating to obtain a salt spray resistant, corrosion resistant and wear resistant coating.

2. The preparation process of the salt spray resistant, corrosion resistant and wear resistant coating according to claim 1, characterized in that: The mass ratio of hexachlorocyclotriphosphazene, glycidol and triethylamine catalyst in (1) is 1:3.6-5:0.01-0.

02.

3. The preparation process of the salt spray resistant, corrosion resistant and wear resistant coating according to claim 1, characterized in that: The mass ratio of hexaglycidyl cyclotriphosphazene, 1-(2-hydroxyethyl)imidazole and boron trifluoride etherate catalyst in (2) is 0.6-0.8:1:0.02-0.

04.

4. The preparation process of the salt spray resistant, corrosion resistant and wear resistant coating according to claim 1, characterized in that: The mass ratio of the intermediate, pentaerythritol phosphate and p-toluenesulfonic acid catalyst in (4) is 1:1.1-1.3:0.01-0.

03.

5. The preparation process of the salt spray resistant, corrosion resistant and wear resistant coating according to claim 1, characterized in that: The mass ratio of thionyl chloride to the intermediate in (5) is 1.4-2:

1.

6. The preparation process of the salt spray resistant, corrosion resistant and wear resistant coating according to claim 1, characterized in that: The mass ratio of the phenolic resin, the acyl chloride intermediate and the triethylamine catalyst in (6) is 1:2.4-3.2:0.02-0.

03.

7. A process for preparing the salt spray resistant, corrosion resistant and wear resistant coating according to any one of claims 1 to 6, characterized in that: Application of the salt spray resistant, corrosion resistant and wear resistant coating in equipment.

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