A kind of corrosion-resistant water-based paint and its preparation process

Abstract

The present invention relates to the technical field of paints, and discloses a corrosion-resistant water-based paint and a preparation process thereof, wherein the present invention is by adding water-based acrylic resin, silicon-modified imidazole-based flame retardant, graphene-modified imidazole, silicone resin defoamer, propylene glycol film-forming agent, and water into a stirrer, stirring, and obtaining corrosion-resistant water-based paint after terminating. Phosphorus element, silicon element, and nitrogen element contained in silicon-modified imidazole-based flame retardant and graphene-modified imidazole have good flame retardant effect; imidazole group and quaternary ammonium salt group contained therein have good antibacterial effect, and react with 2,4,6-tris(4-formylphenyl)-1,3,5-triazine and intermediate, improve the substitution degree of quaternary ammonium salt and imidazole, further improve its antibacterial effect; ferrocene group in corrosion-resistant water-based paint has good corrosion-resistant effect, and triazine group and graphene structure itself have good water resistance and corrosion-resistant effect.

Description

Technical Field

[0001] The invention relates to the technical field of paints, in particular to a corrosion-resistant water-based paint and a preparation process thereof. Background Art

[0002] Paint is a mixture of paint and coating that can be firmly covered on the surface of an object for protection, marking and other special purposes. With the development of society, the use of furniture has brought convenience to human life, but it is easily oxidized and corroded when exposed to the air for a long time, and it is flammable when encountering a fire. Therefore, it is necessary to develop a water-based furniture paint to solve these problems. For example, patent CN110218497B discloses a corrosion-resistant water-based paint and its preparation process. The invention has good salt water corrosion resistance, but its flame retardant performance has not been 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 corrosion-resistant water-based paint and a preparation process thereof, which has good antibacterial, flame-retardant, water-resistant and corrosion-resistant effects.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a corrosion-resistant water-based paint and a preparation process thereof, comprising the following components by weight: 40-75 parts by weight of a water-based acrylic resin, 4-8 parts by weight of a silicon-modified imidazole-based flame retardant, 3-6 parts by weight of a graphene-modified imidazole, 1-1.6 parts by weight of a silicone resin defoamer, 1-2 parts by weight of a propylene glycol film-forming agent, and 25-40 parts by weight of water.

[0007] Preferably, the preparation method of the silicon-modified imidazole-based flame retardant is:

[0008] (1) Add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and triethylamine catalyst to dichloromethane solvent, stir mechanically for 10-15 minutes, add carbon tetrachloride dropwise in an ice bath, complete the addition within 1-2 hours, then remove the ice bath, continue to react at room temperature for 10-12 hours, wash with deionized water 2-4 times after the reaction is completed, and vacuum dry at 45-65°C for 20-24 hours to obtain phosphorus-containing modified imidazole;

[0009] (2) adding 10-15 parts by weight of 2-amino-3-chloropropionic acid and 8-12 parts by weight of phosphorus-modified imidazole to N,N-dimethylformamide solvent, stirring to dissolve, carrying out quaternization reaction, heating to 55-70° C. to carry out reaction, and after completion, distilling under reduced pressure, washing, and drying to obtain an intermediate;

[0010] (3) Add 2,4,6-tris(4-formylphenyl)-1,3,5-triazine and the intermediate to the isopropanol solvent, stir and mix, heat to 30-50°C, react for 8-12h, then continue to add 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst, react at 60-90°C for 8-12h, filter and wash after completion to obtain ferrocene-modified imidazole;

[0011] (4) Add pentaerythritol methyl silicate and ferrocene-modified imidazole to N,N-dimethylformamide solvent, stir and mix, then continue to add p-toluenesulfonic acid catalyst to carry out esterification reaction, react at 65-80° C. for 6-15 hours, and then perform reduced pressure distillation, wash, and dry to obtain a silicon-modified imidazole-based flame retardant.

[0012] Preferably, in said (1), the mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, triethylamine catalyst and carbon tetrachloride is 1.2-1.5:0.04-0.5:1.

[0013] Preferably, the reaction time in (2) is 4-8 hours.

[0014] Preferably, in (3), the mass ratio of 2,4,6-tris(4-formylphenyl)-1,3,5-triazine, intermediate, 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst is 1:1.3-1.5:1.1-1.3:0.02-0.04.

[0015] Preferably, the ratio of pentaerythritol methyl silicate, ferrocene-modified imidazole and p-toluenesulfonic acid catalyst in (4) is 1.3-1.5:1:0.01-0.04.

[0016] Preferably, the preparation method of the graphene-modified imidazole is:

[0017] S1. ultrasonically dispersing 5-10 parts by weight of graphene oxide into 14-20 parts by weight of thionyl chloride, and after uniform dispersion, reacting at 65-80° C. for 12-18 hours, and after the reaction, filtering, washing, and drying to obtain chlorinated graphene;

[0018] S2. Add 4-7 parts by weight of graphene chloride and 8-15 parts by weight of the intermediate to N,N-dimethylformamide solvent, stir and disperse, then continue to add 1-2 parts by weight of triethylamine catalyst, react at 75-95°C for 3-5h, and then perform rotary distillation and washing to obtain graphene-modified imidazole.

[0019] Preferably, the preparation process of the corrosion-resistant water-based paint is: adding water-based acrylic resin, silicon-modified imidazole-based flame retardant, graphene-modified imidazole, silicone resin defoamer, propylene glycol film-forming agent, and water into a stirrer, stirring for 10-12 minutes, and then obtaining the corrosion-resistant water-based paint.

[0020] 3. Beneficial technical effects

[0021] The invention provides a corrosion-resistant water-based paint by adding water-based acrylic resin, silicon-modified imidazole-based flame retardant, graphene-modified imidazole, silicone resin defoamer, propylene glycol film-forming agent and water into a stirrer and stirring the mixture.

[0022] The phosphorus, silicon and nitrogen elements contained in silicon-modified imidazole-based flame retardants and graphene-modified imidazoles have good flame retardant effects; the imidazole groups and quaternary ammonium salt groups contained therein have good antibacterial effects, and the substitution degree of quaternary ammonium salts and imidazoles is increased by reacting 2,4,6-tris(4-formylphenyl)-1,3,5-triazine with intermediates, thereby further improving their antibacterial effects; the ferrocene group in the corrosion-resistant water-based paint has good corrosion resistance, and the triazine group and graphene structure therein have good water resistance and corrosion resistance. DETAILED DESCRIPTION

[0023] Example 1

[0024] (1) Add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and triethylamine catalyst to dichloromethane solvent, stir mechanically for 10 minutes, add carbon tetrachloride thereto under ice bath conditions, wherein the mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, triethylamine catalyst and carbon tetrachloride is 1.2:0.04:1, and the addition is completed within 1 hour, then remove the ice bath, continue to react at room temperature for 10 hours, after the reaction is completed, wash with deionized water twice, and vacuum dry at 45°C for 20 hours to obtain phosphorus-containing modified imidazole;

[0025] (2) Add 10 parts by weight of 2-amino-3-chloropropionic acid and 8 parts by weight of phosphorus-modified imidazole to N,N-dimethylformamide solvent, stir to dissolve, heat to 55° C. to react for 4 hours, and then distill under reduced pressure, wash, and dry to obtain an intermediate;

[0026] (3) Add 2,4,6-tris(4-formylphenyl)-1,3,5-triazine and the intermediate to the isopropanol solvent, stir and mix, heat to 30°C, react for 8 hours, and then continue to add 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst, wherein the mass ratio of 2,4,6-tris(4-formylphenyl)-1,3,5-triazine, intermediate, 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst is 1:1.3:1.1:0.02, react at 60°C for 8 hours, filter and wash after completion to obtain ferrocene-modified imidazole;

[0027] (4) adding pentaerythritol methyl silicate and ferrocene-modified imidazole to N,N-dimethylformamide solvent, stirring and mixing, and then adding p-toluenesulfonic acid catalyst, wherein the ratio of pentaerythritol methyl silicate, ferrocene-modified imidazole and p-toluenesulfonic acid catalyst is 1.3:1:0.01, and carrying out esterification reaction at 65°C for 6h, and then distilling under reduced pressure, washing and drying after completion to obtain silicon-modified imidazole-based flame retardant;

[0028] (5) ultrasonically dispersing 5 parts by weight of graphene oxide into 14 parts by weight of thionyl chloride, and after being evenly dispersed, reacting at 65° C. for 12 h. After the reaction, filtering, washing, and drying to obtain chlorinated graphene;

[0029] (6) Add 4 parts by weight of chlorinated graphene and 8 parts by weight of the intermediate to N,N-dimethylformamide solvent, stir and disperse, then continue to add 1 part by weight of triethylamine catalyst, react at 75° C. for 3 hours, and then perform rotary distillation and washing to obtain graphene-modified imidazole;

[0030] (7) 40 parts by weight of water-based acrylic resin, 4 parts by weight of silicon-modified imidazole-based flame retardant, 3 parts by weight of graphene-modified imidazole, 1 part by weight of silicone resin defoamer, 1 part by weight of propylene glycol film-forming agent, and 25 parts by weight of water are added into a stirrer and stirred for 10 minutes to obtain a corrosion-resistant water-based paint.

[0031] Example 2

[0032] (1) Add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and triethylamine catalyst to dichloromethane solvent, stir mechanically for 15 minutes, add carbon tetrachloride thereto under ice bath conditions, wherein the mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, triethylamine catalyst and carbon tetrachloride is 1.5: 0.5: 1, and the addition is completed within 2 hours, then the ice bath is removed, and the reaction is continued at room temperature for 12 hours. After the reaction is completed, the mixture is washed with deionized water 4 times and vacuum dried at 65° C. for 24 hours to obtain phosphorus-containing modified imidazole;

[0033] (2) Add 15 parts by weight of 2-amino-3-chloropropionic acid and 12 parts by weight of phosphorus-modified imidazole to N,N-dimethylformamide solvent, stir to dissolve, heat to 70°C for reaction, wherein the reaction time is 8 hours, and then distill under reduced pressure, wash, and dry to obtain an intermediate;

[0034] (3) Add 2,4,6-tris(4-formylphenyl)-1,3,5-triazine and the intermediate to the isopropanol solvent, stir and mix, heat to 50°C, react for 12 hours, and then continue to add 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst, wherein the mass ratio of 2,4,6-tris(4-formylphenyl)-1,3,5-triazine, intermediate, 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst is 1: 1.5: 1.3: 0.04, react at 90°C for 12 hours, filter and wash after completion to obtain ferrocene-modified imidazole;

[0035] (4) adding pentaerythritol methyl silicate and ferrocene-modified imidazole to N,N-dimethylformamide solvent, stirring and mixing, and then adding p-toluenesulfonic acid catalyst, wherein the ratio of pentaerythritol methyl silicate, ferrocene-modified imidazole and p-toluenesulfonic acid catalyst is 1.5:1:0.04, and carrying out esterification reaction at 80°C for 15h, and then carrying out reduced pressure distillation after completion, washing, and drying to obtain a silicon-modified imidazole-based flame retardant;

[0036] (5) ultrasonically dispersing 10 parts by weight of graphene oxide into 20 parts by weight of thionyl chloride, and after being evenly dispersed, reacting at 80° C. for 18 hours. After the reaction, filtering, washing, and drying to obtain chlorinated graphene;

[0037] (6) Add 7 parts by weight of chlorinated graphene and 15 parts by weight of the intermediate to N,N-dimethylformamide solvent, stir and disperse, then continue to add 2 parts by weight of triethylamine catalyst, react at 95° C. for 5 hours, and then perform rotary distillation and washing to obtain graphene-modified imidazole;

[0038] (7) Add 75 parts by weight of water-based acrylic resin, 8 parts by weight of silicon-modified imidazole-based flame retardant, 6 parts by weight of graphene-modified imidazole, 1.6 parts by weight of silicone resin defoamer, 2 parts by weight of propylene glycol film-forming agent, and 40 parts by weight of water into a stirrer and stir for 12 minutes to obtain a corrosion-resistant water-based paint.

[0039] Example 3

[0040] (1) Add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and triethylamine catalyst to dichloromethane solvent, stir mechanically for 12 minutes, add carbon tetrachloride thereto under ice bath conditions, wherein the mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, triethylamine catalyst and carbon tetrachloride is 1.3:0.045:1, and the addition is completed within 1.5 hours, then remove the ice bath, continue to react at room temperature for 11 hours, after the reaction is completed, wash with deionized water 3 times, and vacuum dry at 55°C for 22 hours to obtain phosphorus-modified imidazole;

[0041] (2) Add 12 parts by weight of 2-amino-3-chloropropionic acid and 10 parts by weight of phosphorus-modified imidazole to N,N-dimethylformamide solvent, stir to dissolve, heat to 65° C. to react for 6 hours, and then distill under reduced pressure, wash, and dry to obtain an intermediate;

[0042] (3) Add 2,4,6-tris(4-formylphenyl)-1,3,5-triazine and the intermediate to the isopropanol solvent, stir and mix, heat to 40°C, react for 10 hours, and then continue to add 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst, wherein the mass ratio of 2,4,6-tris(4-formylphenyl)-1,3,5-triazine, intermediate, 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst is 1:1.4:1.2:0.03, react at 75°C for 10 hours, filter and wash after completion to obtain ferrocene-modified imidazole;

[0043] (4) adding pentaerythritol methyl silicate and ferrocene-modified imidazole to N,N-dimethylformamide solvent, stirring and mixing, and then adding p-toluenesulfonic acid catalyst, wherein the ratio of pentaerythritol methyl silicate, ferrocene-modified imidazole and p-toluenesulfonic acid catalyst is 1.4:1:0.02, and carrying out esterification reaction at 72°C for 10 hours. After the reaction, distillation under reduced pressure, washing and drying are carried out to obtain a silicon-modified imidazole-based flame retardant;

[0044] (5) ultrasonically dispersing 7 parts by weight of graphene oxide into 17 parts by weight of thionyl chloride, and after being evenly dispersed, reacting at 72° C. for 15 h. After the reaction, filtering, washing, and drying to obtain chlorinated graphene;

[0045] (6) Add 5 parts by weight of chlorinated graphene and 11 parts by weight of the intermediate to N,N-dimethylformamide solvent, stir and disperse, then continue to add 1.5 parts by weight of triethylamine catalyst, react at 85° C. for 4 hours, and then perform rotary distillation and washing to obtain graphene-modified imidazole;

[0046] (7) 57 parts by weight of water-based acrylic resin, 6 parts by weight of silicon-modified imidazole-based flame retardant, 4 parts by weight of graphene-modified imidazole, 1.3 parts by weight of silicone resin defoamer, 1.5 parts by weight of propylene glycol film-forming agent, and 32 parts by weight of water were added into a stirrer and stirred for 11 minutes to obtain a corrosion-resistant water-based paint.

[0047] Example 4

[0048] (1) Add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and triethylamine catalyst to dichloromethane solvent, stir mechanically for 10 minutes, add carbon tetrachloride thereto under ice bath conditions, wherein the mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, triethylamine catalyst and carbon tetrachloride is 1.2:0.04:1, and the addition is completed within 1 hour, then remove the ice bath, continue to react at room temperature for 10 hours, after the reaction is completed, wash with deionized water twice, and vacuum dry at 45°C for 20 hours to obtain phosphorus-containing modified imidazole;

[0049] (2) Add 10 parts by weight of 2-amino-3-chloropropionic acid and 8 parts by weight of phosphorus-modified imidazole to N,N-dimethylformamide solvent, stir to dissolve, heat to 55° C. to react for 4 hours, and then distill under reduced pressure, wash, and dry to obtain an intermediate;

[0050] (3) Add 2,4,6-tris(4-formylphenyl)-1,3,5-triazine and the intermediate to the isopropanol solvent, stir and mix, heat to 50°C, react for 12 hours, and then continue to add 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst, wherein the mass ratio of 2,4,6-tris(4-formylphenyl)-1,3,5-triazine, intermediate, 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst is 1: 1.5: 1.3: 0.04, react at 90°C for 12 hours, filter and wash after completion to obtain ferrocene-modified imidazole;

[0051] (4) adding pentaerythritol methyl silicate and ferrocene-modified imidazole to N,N-dimethylformamide solvent, stirring and mixing, and then adding p-toluenesulfonic acid catalyst, wherein the ratio of pentaerythritol methyl silicate, ferrocene-modified imidazole and p-toluenesulfonic acid catalyst is 1.5:1:0.04, and carrying out esterification reaction at 80°C for 15h, and then carrying out reduced pressure distillation after completion, washing, and drying to obtain a silicon-modified imidazole-based flame retardant;

[0052] (5) ultrasonically dispersing 7 parts by weight of graphene oxide into 17 parts by weight of thionyl chloride, and after being evenly dispersed, reacting at 72° C. for 15 h. After the reaction, filtering, washing, and drying to obtain chlorinated graphene;

[0053] (6) Add 5 parts by weight of chlorinated graphene and 11 parts by weight of the intermediate to N,N-dimethylformamide solvent, stir and disperse, then continue to add 1.5 parts by weight of triethylamine catalyst, react at 85° C. for 4 hours, and then perform rotary distillation and washing to obtain graphene-modified imidazole;

[0054] (7) 57 parts by weight of water-based acrylic resin, 6 parts by weight of silicon-modified imidazole-based flame retardant, 4 parts by weight of graphene-modified imidazole, 1.3 parts by weight of silicone resin defoamer, 1.5 parts by weight of propylene glycol film-forming agent, and 32 parts by weight of water were added into a stirrer and stirred for 11 minutes to obtain a corrosion-resistant water-based paint.

[0055] Comparative Example 1

[0056] 57 parts by weight of water-based acrylic resin, 4 parts by weight of graphene-modified imidazole, 1.3 parts by weight of silicone resin defoamer, 1.5 parts by weight of propylene glycol film-forming agent, and 32 parts by weight of water are added into a stirrer and stirred for 11 minutes to obtain corrosion-resistant water-based paint.

[0057] Comparative Example 2

[0058] 57 parts by weight of water-based acrylic resin, 6 parts by weight of silicon-modified imidazole-based flame retardant, 1.3 parts by weight of silicone resin defoamer, 1.5 parts by weight of propylene glycol film-forming agent, and 32 parts by weight of water are added into a stirrer and stirred for 11 minutes to obtain corrosion-resistant water-based paint.

[0059] The limiting oxygen index of the material was tested using an oxygen index meter, and the combustion grade of the material was tested using a horizontal and vertical combustion instrument. The test results are shown in Table 1.

[0060] Table 1: Flame retardancy test;

[0061] project Limiting oxygen index (%) Combustion level Example 1 32 V-0 Example 2 33 V-0 Example 3 32 V-0 Example 4 32 V-0 Comparative Example 1 23 V-1 Comparative Example 2 21 V-1

[0062] It can be seen from Table 1 that Examples 1-4 of the present invention have better flame retardant effects than Comparative Examples 1-2.

[0063] The corrosion-resistant water-based paint was stored at 25°C in the dark for 6 months, and the storage stability of the paint was observed. The water resistance of the paint was tested according to the method of GB / T1733-1993. The salt spray resistance of the paint was tested according to GB / T10125-1997.

[0064] Table 2: The test results are shown in Table 2;

[0065] project Water resistance (720h) Salt spray resistance (h) Example 1 No bubbles, no shedding 636 Example 2 No bubbles, no shedding 650 Example 3 No bubbles, no shedding 632 Example 4 No bubbles, no shedding 640 Comparative Example 1 Foaming, no shedding 510 Comparative Example 2 Foaming, no shedding 512

[0066] It can be seen from Table 2 that Examples 1-4 of the present invention have better water resistance and salt spray resistance than Comparative Examples 1-2, indicating that the corrosion resistance effect is better.

[0067] Antibacterial property: tested in accordance with the standard GB / T21866-2008 "Determination of antibacterial property and antibacterial effect of antibacterial coatings (paint films)";

[0068] Table 3: Antimicrobial test;

[0069] project Antibacterial rate against Escherichia coli and Staphylococcus aureus (%) Example 1 ＞99 Example 2 ＞99 Example 3 ＞99 Example 4 ＞99 Comparative Example 1 ＞93 Comparative Example 2 ＞92

[0070] As can be seen from Table 3, the antibacterial rates of Examples 1-4 are better than those of Comparative Examples 1-2, indicating that the corrosion-resistant water-based paint prepared by the present invention has good antibacterial effect.

[0071] 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 corrosion-resistant water-based paint, characterized in that: The invention comprises the following components by weight: 40-75 parts by weight of water-based acrylic resin, 4-8 parts by weight of silicon-modified imidazole-based flame retardant, 3-6 parts by weight of graphene-modified imidazole, 1-1.6 parts by weight of organic silicone resin defoamer, 1-2 parts by weight of propylene glycol film-forming agent, and 25-40 parts by weight of water; The preparation method of the silicon-modified imidazole-based flame retardant is: (1) Add 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and triethylamine catalyst to dichloromethane solvent, stir mechanically for 10-15 minutes, add carbon tetrachloride dropwise in an ice bath, complete the addition within 1-2 hours, then remove the ice bath, continue to react at room temperature for 10-12 hours, wash with deionized water 2-4 times after the reaction is completed, and vacuum dry at 45-65°C for 20-24 hours to obtain phosphorus-containing modified imidazole; (2) adding 10-15 parts by weight of 2-amino-3-chloropropionic acid and 8-12 parts by weight of phosphorus-modified imidazole to N,N-dimethylformamide solvent, stirring to dissolve, heating to 55-70° C. to react, and then distilling under reduced pressure, washing, and drying to obtain an intermediate; (3) Add 2,4,6-tris(4-formylphenyl)-1,3,5-triazine and the intermediate to the isopropanol solvent, stir and mix, heat to 30-50°C, react for 8-12h, then continue to add 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst, react at 60-90°C for 8-12h, filter and wash after completion to obtain ferrocene-modified imidazole; (4) adding pentaerythritol methyl silicate and ferrocene-modified imidazole to N,N-dimethylformamide solvent, stirring and mixing, and then adding p-toluenesulfonic acid catalyst to carry out esterification reaction at 65-80° C. for 6-15 hours, and then performing reduced pressure distillation, washing, and drying to obtain a silicon-modified imidazole-based flame retardant; The mass ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, triethylamine catalyst and carbon tetrachloride in (1) is 1.2-1.5:0.04-0.5:1; The reaction time in (2) is 4-8h; The mass ratio of 2,4,6-tris(4-formylphenyl)-1,3,5-triazine, intermediate, 1,1-bis(dimethylsilyl)iron and chloroplatinic acid catalyst in (3) is 1:1.3-1.5:1.1-1.3:0.02-0.04; The ratio of pentaerythritol methyl silicate, ferrocene-modified imidazole and p-toluenesulfonic acid catalyst in (4) is 1.3-1.5:1:0.01-0.04; The preparation method of the graphene-modified imidazole is: S1. Ultrasonic dispersion of 5-10 parts by weight of graphene oxide in 14-20 parts by weight of thionyl chloride, uniform dispersion, reaction at 65-80° C. for 12-18 h, and after the reaction, filtration, washing, and drying to obtain chlorinated graphene; S2. Add 4-7 parts by weight of graphene chloride and 8-15 parts by weight of the intermediate to N,N-dimethylformamide solvent, stir and disperse, then continue to add 1-2 parts by weight of triethylamine catalyst, react at 75-95°C for 3-5h, and then perform rotary distillation and washing to obtain graphene-modified imidazole.

2. A process for preparing the corrosion-resistant water-based paint according to claim 1, characterized in that: The preparation process of the corrosion-resistant water-based paint is as follows: adding water-based acrylic resin, silicon-modified imidazole-based flame retardant, graphene-modified imidazole, silicone resin defoamer, propylene glycol film-forming agent and water into a stirrer, stirring for 10-12 minutes, and then obtaining the corrosion-resistant water-based paint.