CN113956754B

CN113956754B - Solvent-free epoxy drinking water tank coating matched with sintered powder epoxy coating and preparation method thereof

Info

Publication number: CN113956754B
Application number: CN202111435684.4A
Authority: CN
Inventors: 杨名亮; 叶维维; 康瑞瑞; 苏雅丽; 宋志生
Original assignee: Xiamen Sunrui Ship Coating Co ltd
Current assignee: Xiamen Sunrui Ship Coating Co ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2023-05-12
Anticipated expiration: 2041-11-29
Also published as: CN113956754A

Abstract

The invention relates to the technical field of paint, and provides a solvent-free epoxy drinking water tank paint matched with a sintered powder epoxy paint and a preparation method thereof, wherein the paint comprises a component A and a component B, and the component A comprises the following components: the adhesive comprises epoxy resin, a silane coupling agent, a reactive diluent, a defoaming agent, a filler, an antirust pigment, a mussel-like adhesive protein polymer and a thixotropic agent, wherein the mass ratio of the epoxy resin to the coupling agent to the mussel-like adhesive protein polymer is 20-60:1-8:1-5; the component B comprises the following components: and (3) a curing agent. Through the synergistic effect of the silane coupling agent and the mussel-like adhesive protein polymer, the solvent-free epoxy drinking water tank coating provided by the invention has excellent interlayer adhesion performance with a sintered powder epoxy coating.

Description

Solvent-free epoxy drinking water tank coating matched with sintered powder epoxy coating and preparation method thereof

Technical Field

The invention relates to the technical field of paint, in particular to solvent-free epoxy drinking water tank paint matched with sintered powder epoxy paint and a preparation method thereof.

Background

China is located on the western coast of the Pacific ocean, has wide region, complex topography and very remarkable continental monsoon climate, thereby causing two major characteristics of uneven distribution and time-course change of water resource regions. The precipitation amount decreases from the southeast coast to the northwest inland, and can be divided into five zones of raininess, wetting, semi-wetting, semiarid, drought and the like in sequence. Because the precipitation is very unevenly distributed in the area, the phenomenon of unbalanced water and soil resources is caused in the whole country, the Yangtze river basin and the south cultivated land of the Yangtze river only occupy 36% of the whole country, and the water resource amount occupies 80% of the whole country; the water resource amount of the three watercourses of Huang, huai and Hai is only 8 percent of the whole country, the cultivated land is 40 percent of the whole country, and the water resource and soil resource are quite different.

The water resource distribution of China is unbalanced, and the problem can be effectively solved through water regulation engineering. At present, some important water diversion projects such as south-to-north water diversion and the like are implemented in China. The water diversion project is divided into an open channel and a culvert. Wherein the culvert generally adopts a Prestressed Concrete Cylinder Pipe (PCCP) or a Steel Pipe (SP) for water delivery. The PCCP pipe can bear higher external load, has good corrosion resistance and low maintenance cost, but the PCCP pipe has large dead weight and higher requirement on the basic bearing capacity, and is a socket joint, so that the PCCP pipe has poor adaptability to foundation deformation as compared with a steel pipe. The steel pipe has high strength, convenient construction and laying, strong adaptability, flexible joint form, less leakage of the pipeline, lighter weight per unit pipe length, capability of being buried and crossed various barriers and high safety. So the steel pipe is adopted by a plurality of water diversion projects.

The design life of the current water delivery engineering is more than 50 years, and the corrosion resistance of the steel pipe, especially the corrosion resistance of the inner wall, is particularly important. The anticorrosive paint for the inner wall of the steel pipe not only has good anticorrosive performance, but also meets the sanitary requirement, and does not affect the water quality. There are two most commonly used at present, sintered powder epoxy coatings and solvent-free drinking water tank coatings. The sintered powder epoxy is cured by heating, and the coating film is compact and high in strength and is widely adopted. However, because the large-scale equipment is adopted for heating construction, construction cannot be carried out at some elbow and joint parts, and solvent-free epoxy drinking water tank paint is generally adopted for coating at the parts at present to provide an anti-corrosion effect.

The solvent-free paint for the drinking water tank has the defects of high viscosity, poor wetting to a base material and the like, so that the paint is easy to fall off in the service process after the repair coating, and the service life of the paint is influenced. Especially in sintered powder epoxy coating and solvent-free epoxy drinking water tank coating overlap joint position, because the high compactness of powder epoxy coating, ordinary solvent-free epoxy drinking water tank coating is difficult to be coated on the upper surface, and the poor matching leads to many projects to appear the problem that drops at two kinds of coating overlap joint positions, influences the life of water delivery steel pipe, even explodes the pipe and brings the incident. At present, a plurality of patents for solvent-free drinking water tank paint exist at home and abroad, for example, patent application number CN201811555685.0 discloses a long-acting non-toxic long-acting solvent-free drinking water tank paint, and patent application number CN101210147A discloses a large-sized container inner wall solvent-free non-toxic paint. The above patents are improved in a great deal in terms of non-toxicity and long-acting, but the problem of the matching adhesive force of solvent-free water tank paint and sintered powder epoxy coating in the water diversion engineering application is not solved.

The Chinese patent with publication number CN109627917A published in 4.16.2019 discloses a nontoxic long-acting solvent-free drinking water tank coating and a preparation method thereof, wherein the coating comprises a component A and a component B; wherein, the component A comprises the following raw materials: epoxy resin, dimer acid modified epoxy resin, an aminosilane coupling agent, a dispersing agent, a defoaming agent, a nontoxic filler, glass flakes, a nano double electric layer material and a thixotropic agent; the component B comprises the following raw materials: amine curing agent and epoxy silane coupling agent. The patent adopts the addition of the silane coupling agent to improve the interlayer adhesion performance, but the silane coupling agent belongs to organic silicon, has lower surface energy, has poor wetting and dispersing effects on the coating, particularly the high-compactness coating, can not penetrate into microscopic pores of the coating, can only bond with residual epoxy groups on the surface, and improves the adhesion strength to a certain extent, so the interlayer adhesion performance of the solvent-free drinking water tank coating in the technical scheme of the patent is not high.

Disclosure of Invention

In order to solve the defect of low interlayer adhesiveness of the solvent-free water tank coating in the prior art, the invention provides the solvent-free epoxy water tank coating matched with the sintered powder epoxy coating, which comprises a component A and a component B, wherein the component A comprises the following components: the adhesive comprises epoxy resin, a silane coupling agent, a reactive diluent, a defoaming agent, a filler, an antirust pigment, a mussel-like adhesive protein polymer and a thixotropic agent, wherein the mass ratio of the epoxy resin to the coupling agent to the mussel-like adhesive protein polymer is 20-60:1-8:1-5; the component B comprises the following components: and (3) a curing agent.

In one embodiment, the first component comprises: 20-60 parts of epoxy resin, 1-8 parts of coupling agent, 5-15 parts of reactive diluent, 0.5-2 parts of defoamer, 10-25 parts of filler, 10-30 parts of antirust pigment, 1-5 parts of mussel-like adhesive protein polymer and 0.5-1 part of thixotropic agent; the component B comprises the following components: phenolic epoxy curing agents.

In one embodiment, the phenolic epoxy hardener is 100 parts.

In a preferred embodiment, the first component comprises: 20-60% of epoxy resin, 1-8% of coupling agent, 5-15% of reactive diluent, 0.5-2% of defoamer, 10-25% of filler, 10-30% of rust-proof pigment, 1-5% of mussel-like adhesive protein polymer and 0.5-1% of thixotropic agent; the component B comprises the following components: and 100% of phenolic epoxy curing agent.

In one embodiment, the epoxy is 618 epoxy and/or 6101 resin.

In one embodiment, the coupling agent is KH550 and/or KH560.

In one embodiment, the reactive diluent is one or more of 660A, NC513 and E10P.

In one embodiment, the defoamer is a vegetable oil and a silicone.

In one embodiment, the defoamer is one or more of BYK-066N, BYK-065, BYK-077 and BYK-085.

In an embodiment, the mussel-like adhesive protein polymer is prepared by a method in a chinese patent No. zl2015197120. X, "preparation method of multifunctional group mussel-like adhesive protein polymer", specifically as follows: adding maleic anhydride and ammonia water into a container A, and carrying out vacuumizing and decompressing reaction on the flask to obtain PSI powder; adding the PSI powder and water into a container B, dispersing for 30 minutes, and then adding an alcohol amine monomer for reaction to obtain PHEA powder; adding PHEA into a container C, introducing nitrogen into the container C, and then adding D0PA monomer and a reduction protective agent for reaction to obtain PHEA-DOPA; adding PHEA-DOPA into a container D, adding amine monomers for reaction, adding epoxy monomers for chain extension, and obtaining the mussel-like adhesive protein polymer after chain extension.

In a preferred embodiment, the mass ratio of maleic anhydride to ammonia is 1: (1-1.4).

In a preferred embodiment, the PSI powder is 9.7 parts, the water is 19.4 parts, and the alcohol amine monomer is 30% -65% of the PSI powder by mass.

In a preferred embodiment, the PHEA is 34.2 parts, the DOPA is 5% to 30% of the PSI powder mass, and the reduction protectant is 1% of the PSI powder mass.

In a preferred embodiment, the PHEA-DOPA is 37.2 parts, the amine monomer is 5% to 65% of the PSI powder mass, and the epoxy monomer is 5% to 65% of the PSI powder mass.

In a preferred embodiment, the reaction temperature is 150 to 250℃and the reaction time is 2 to 10 hours when the evacuation and the depressurization are carried out.

In a preferred embodiment, the PSI powder and water are added to vessel B at a rotational speed of 100 to 800rpm, and then the alcohol amine monomer is added to react at 25 to 100℃for 1 to 24 hours.

In a more preferred embodiment, the alcohol amine monomer is one or more of ethylene glycol amine, triethanolamine, diethylene glycol amine, and N, N-dimethylethanolamine.

In a preferred embodiment, when adding the PHEA to the container C and introducing nitrogen into the container C, and then adding the D0PA monomer and the reduction protecting agent to react, the reaction temperature is 60-100 ℃ and the reaction time is 2-28 h.

In a more preferred embodiment, the DOPA is one or more of dopamine and dopamine derivatives.

In a more preferred embodiment, the reducing protective agent is one or more of sodium thiosulfate, sodium sulfite, sodium dithionite, and citric acid.

In a preferred embodiment, the PHEA-DOPA is added into the container D, and then amine monomers are added for reaction, wherein the reaction temperature is 25-80 ℃, the reaction time is 1-12 h, and the reaction temperature is 25-100 ℃ and the reaction time is 1-12 h when epoxy monomers are added for chain extension.

In a more preferred embodiment, the epoxy monomer has a difunctional group.

In one embodiment, the thixotropic agent is one or more of M-5 fumed silica, LV thixotropic agent, and organobentonite.

In one embodiment, the filler is one or more of talc, precipitated barium sulfate and mica powder.

In one embodiment, the rust inhibitive pigment is iron oxide red and/or iron titanium powder.

The invention also provides a preparation method of the solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating in any technical scheme, wherein the preparation method of the component A comprises the following steps: weighing the epoxy resin, the reactive diluent, the coupling agent, the mussel-like adhesive protein polymer and the defoamer according to the formula, sequentially adding the materials while dispersing, and uniformly mixing; then sequentially adding the antirust pigment, the filler and the thixotropic agent according to the formula amount, and dispersing at a high speed until the fineness is less than or equal to 80 mu m; mixing the component A and the component B to obtain the solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating.

In one embodiment of the method, the first dispersion is performed at a speed of 300-800 rpm for a period of 5-15 min during the preparation of the first component; the rotation speed of the second dispersion is 1000-1700 rpm, and the time is 20-60 min.

In a preferred embodiment of the process, the first dispersion is carried out at a speed of 500rpm for a period of 15mi n during the preparation of the first component; the rotation speed of the second dispersion is 1500rpm, and the time is 30 min;

in an embodiment of the preparation method, the mass ratio of the component a to the component b when mixed is 4 to 6:1 to 2.

Based on the above, compared with the prior art, the solvent-free epoxy drinking water cabin coating matched with the sintering powder epoxy coating provided by the invention has the advantage that the interlayer adhesive force of the two coatings is improved by utilizing the synergistic effect of the silane coupling agent and the mussel-like adhesive protein polymer. The fusion powder epoxy coating is formed into a film by high-temperature heating, so that the coating is compact, the common solvent-free water tank coating is high in viscosity and is difficult to wet and adhere to the surface of the coating, and a silane coupling agent is generally added to improve interlayer adhesion performance, but the silane coupling agent belongs to organic silicon, is low in surface energy, poor in wetting and dispersing on the coating, particularly a high-compactness coating, cannot penetrate into microscopic pores of the coating, can only be bonded with residual epoxy groups on the surface, and improves adhesion strength to a certain extent. After the mussel-like adhesive protein polymer is added, the mussel-like adhesive protein polymer structure contains DOPA groups, so that the mussel-like adhesive protein polymer has broad-spectrum adhesive property, can be adsorbed with a silane coupling agent to improve the wetting ability of the silane coupling agent on a coating, improve the permeability of the silane coupling agent in microscopic pores of a powder epoxy coating, improve the bonding ratio, and can greatly improve the adhesive strength with the powder epoxy coating. In addition, DOPA groups in the mussel-like adhesive protein polymer structure are easily oxidized into DOPA quinone, and can generate complex reaction with fillers in the powder epoxy coating, so that the adhesive strength of the solvent-free drinking water cabin coating and the powder epoxy coating can be improved. Therefore, the developed solvent-free epoxy drinking water tank coating has excellent interlayer adhesion performance with the sintered powder epoxy coating through the synergistic effect of the silane coupling agent and the mussel-like adhesive protein polymer.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments; the technical features designed in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that all terms used in the present invention (including technical terms and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs and are not to be construed as limiting the present invention; it will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The present invention provides the following examples and comparative examples

The preparation methods of examples and comparative examples are as follows

The preparation method of the component A comprises the following steps: weighing the epoxy resin, the reactive diluent, the coupling agent, the mussel-like adhesive protein polymer and the defoamer according to the formula, sequentially adding the materials while dispersing, and uniformly mixing; then sequentially adding the antirust pigment, the filler and the thixotropic agent according to the formula amount, and dispersing at a high speed until the fineness is less than or equal to 80 mu m; mixing the component A and the component B to obtain the solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating.

When the component A is prepared, the rotating speed of the first dispersion is 300-800 rpm, and the time is 5-15 min; the rotation speed of the second dispersion is 1000-1700 rpm, and the time is 20-60 min.

The types and amounts of the components of the examples and comparative examples are shown in the following table:

TABLE 1

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Table 1, below

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In examples 1 to 4, the mussel adhesive protein-like polymer was prepared as follows:

maleic anhydride and ammonia water are added into a container A, and the mass ratio of the maleic anhydride to the ammonia water is 1: (1-1.4), performing vacuum reaction on the flask to obtain PSI powder; adding the PSI powder and water into a container B, dispersing for 30 minutes, and then adding an alcohol amine monomer for reaction to obtain PHEA powder; adding PHEA into a container C, introducing nitrogen into the container C, and then adding D0PA monomer and a reduction protective agent for reaction to obtain PHEA-DOPA; adding PHEA-DOPA into a container D, adding amine monomers for reaction, adding epoxy monomers for chain extension, and obtaining the mussel-like adhesive protein polymer, wherein the PSI powder is 9.7 parts, the water is 19.4 parts, the alcohol amine monomer is 30-65% of the PSI powder in mass, the PHEA is 34.2 parts, the DOPA is 5-30% of the PSI powder in mass, the reduction protective agent is 1% of the PSI powder in mass, the PHEA-DOPA is 37.2 parts, the amine monomer is 5-65% of the PSI powder in mass, and the epoxy monomer is 5-65% of the PSI powder in mass.

In example 1, the ratio of component A to component B was 5:1; in example 2, the ratio of component A to component B was 4:1; in example 3, the ratio of component A to component B was 5:2; in example 4, the ratio of the first component to the second component was 5:1.

Comparative example is a control experiment performed on the basis of example 1, in which the ratio of the first component and the second component is the same as example 1, and the preparation method of the mussel-like adhesive protein polymer is the same as example 1, wherein the comparative example 1 is not using a silane coupling agent, and 2 parts of mussel-like adhesive protein polymer are added as compared with example 1; comparative example 2 compared to example 1, mussel-like adhesive protein polymer was not used; comparative example 3 and example 1, neither silane coupling agent nor mussel adhesive protein-like polymer were used.

The test results and test criteria are shown in Table 2

TABLE 2

The above preparation methods, the brands of the raw materials and other technical indexes adopted in the examples and comparative examples can be selected according to the prior art, and if the technical indexes are specified in the invention, the technical indexes are selected within the specified range of the invention, so that the technical effects of the invention are not affected.

According to the above examples and comparative example data, the technical effects of the examples are superior to those of the comparative examples, comparative example 1 to comparative example 3 are set with reference to example 1, comparative example 3 is free of mussel adhesive protein polymer and silane coupling agent as compared with example 1, comparative example 2 is free of mussel adhesive protein polymer as compared with example 1, the adhesive force of comparative example 2 is increased by 1MPa as compared with comparative example 3, the result is that the silane coupling agent is used in comparative example 2, the effect of the 8 parts of silane coupling agent on the adhesive force is 1MPa, the silane coupling agent and mussel adhesive protein polymer are used in example 1, the adhesive force is increased by 4MPa as compared with comparative example 3, and the adhesive force is increased by 3MPa as compared with comparative example 2, however, the adhesive force of comparative example 1 is not increased by 2 parts of mussel adhesive protein polymer as compared with example 1, the adhesive force of 4 parts of mussel adhesive protein polymer as compared with comparative example 3, and thus the effect of the adhesive protein polymer on the adhesive force of 4 parts as compared with example 3 is 2 MPa when the adhesive protein polymer alone is used. From this, it can be seen that if 2 parts of the mussel-like adhesive protein polymer in example 1 were used alone and 8 parts of the silane coupling agent were used alone, the adhesion of example 1 should be increased by 2.5MPa, i.e., 5.5MPa, on the basis of comparative example 3, whereas the actual adhesion of example 1 was 8MPa, so that the mussel-like adhesive protein polymer and the silane coupling agent exert a synergistic effect.

In conclusion, compared with the prior art, the solvent-free epoxy drinking water cabin coating matched with the sintering powder epoxy coating provided by the invention has the advantage that the interlayer adhesive force of the two coatings is improved by utilizing the synergistic effect of the silane coupling agent and the mussel-like adhesive protein polymer. The fusion powder epoxy coating is formed into a film by high-temperature heating, so that the coating is compact, the common solvent-free water tank coating is high in viscosity and is difficult to wet and adhere to the surface of the coating, and a silane coupling agent is generally added to improve interlayer adhesion performance, but the silane coupling agent belongs to organic silicon, is low in surface energy, poor in wetting and dispersing on the coating, particularly a high-compactness coating, cannot penetrate into microscopic pores of the coating, can only be bonded with residual epoxy groups on the surface, and improves adhesion strength to a certain extent. After the mussel-like adhesive protein polymer is added, the mussel-like adhesive protein polymer structure contains DOPA groups, so that the mussel-like adhesive protein polymer has broad-spectrum adhesive property, can be adsorbed with a silane coupling agent to improve the wettability of the silane coupling agent, improve the permeability of the silane coupling agent in microscopic pores of the powder epoxy coating, improve the bonding ratio, and can greatly improve the adhesive strength with the powder epoxy coating. In addition, DOPA groups in the mussel-like adhesive protein polymer structure are easily oxidized into DOPA quinone, and can generate complex reaction with fillers in the powder epoxy coating, so that the adhesive strength of the solvent-free drinking water cabin coating and the powder epoxy coating can be improved. Therefore, the developed solvent-free epoxy drinking water tank coating has excellent interlayer adhesion performance with the sintered powder epoxy coating through the synergistic effect of the silane coupling agent and the mussel-like adhesive protein polymer.

In addition, it should be understood by those skilled in the art that although many problems exist in the prior art, each embodiment or technical solution of the present invention may be modified in only one or several respects, without having to solve all technical problems listed in the prior art or the background art at the same time. Those skilled in the art will understand that nothing in one claim should be taken as a limitation on that claim.

Although terms such as epoxy resin, silane coupling agent, reactive diluent, defoamer, filler, rust inhibitive pigment, mussel-like adhesive protein polymer, thixotropic agent, curing agent, etc. are more used herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention; the terms first, second, and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating is characterized in that: comprises a component A and a component B, wherein,

the A component comprises: 20-60 parts of epoxy resin, 4.5-8 parts of coupling agent, 5-15 parts of reactive diluent, 0.5-2 parts of defoamer, 10-25 parts of filler, 10-30 parts of rust-proof pigment, 1-5 parts of mussel-like adhesive protein polymer and 0.5-1 part of thixotropic agent;

the component B comprises the following components: phenolic epoxy curing agent;

the coupling agent is KH550 and/or KH560;

the mussel-like adhesive protein polymer is prepared by the following method:

adding maleic anhydride and ammonia water into a container A, and carrying out vacuumizing and decompressing reaction on the container A to obtain PSI powder;

adding the PSI powder and water into a container B, dispersing for 30 minutes, and then adding an alcohol amine monomer for reaction to obtain PHEA powder;

adding PHEA into a container C, introducing nitrogen into the container C, and then adding DOPA monomer and a reduction protective agent for reaction to obtain PHEA-DOPA;

adding PHEA-DOPA into a container D, adding amine monomers for reaction, adding epoxy monomers for chain extension, and obtaining the mussel-like adhesive protein polymer after chain extension;

the alcohol amine monomer is one or more of ethylene glycol amine, triethanolamine, diethylene glycol amine and N, N-dimethylethanolamine;

the DOPA is one or more of dopamine and dopamine derivatives;

the epoxy monomer has a difunctional group;

the reducing protective agent is one or more of sodium thiosulfate, sodium sulfite, sodium dithionite and citric acid.

2. The solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating according to claim 1, which is characterized in that: the epoxy resin is 618 epoxy resin and/or 6101 resin.

3. The solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating according to claim 1, which is characterized in that: the reactive diluent is one or more of 660A, NC513 and E10P.

4. The solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating according to claim 1, which is characterized in that: the defoamer is vegetable oil and organic silicon.

5. The solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating according to claim 1, which is characterized in that: the defoamer is one or more of BYK-066N, BYK-065, BYK-077 and BYK-085.

6. The solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating according to claim 1, which is characterized in that: the thixotropic agent is one or more of M-5 fumed silica, LV thixotropic agent and organic bentonite, the filler is one or more of talcum powder, precipitated barium sulfate and mica powder, and the rust-proof pigment is iron oxide red and/or iron titanium powder.

7. A method of preparing a solvent-free epoxy drinking vessel coating material in combination with a sintered powder epoxy coating material according to any one of claims 1 to 6, characterized in that: the preparation method of the component A comprises the following steps: weighing the epoxy resin, the reactive diluent, the coupling agent, the mussel-like adhesive protein polymer and the defoamer according to the formula, sequentially adding the materials while dispersing, and uniformly mixing; then sequentially adding the antirust pigment, the filler and the thixotropic agent in the formula amount, and dispersing at high speed, wherein the fineness is less than or equal to 80 mu m; and mixing the component A and the component B to obtain the solvent-free epoxy drinking water tank coating matched with the sintered powder epoxy coating.