A solvent-free type epoxy drinking water paint and a preparation method thereof

Abstract

This invention discloses a solvent-free epoxy drinking water paint, relating to the field of coating technology. By weight, it comprises the following components: 100 parts epoxy resin, 12-16 parts silane-modified quaternary ammonium salt, 8-12 parts reactive diluent, 15-20 parts pigments and fillers, 3-4 parts additives, 30-38 parts phenolic amine curing agent, 10-14 parts polyetheramine D230 curing agent, and 2-5 parts accelerator DMP-30. This invention exhibits good adhesion, improved antibacterial properties, and a long-lasting antibacterial effect.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a solvent-free epoxy water-based paint and its preparation method. Background Technology

[0002] Drinking water paint is used as a coating for drinking water facilities, tanks, pipes, and other surfaces that come into contact with drinking water. Currently, the anti-corrosion coatings used on the inner walls of drinking water tanks, drinking water distribution pipelines, and equipment are mostly solvent-based epoxy coatings and solvent-free epoxy coatings. Among them, solvent-free epoxy coatings do not contain volatile solvents (VOCs), do not pollute water quality, and are safer and more reliable, representing an important development trend for drinking water paint.

[0003] Because the coating is immersed in water for extended periods, it requires stronger adhesion to prevent blistering and peeling. Furthermore, microorganisms easily proliferate in water, necessitating a certain level of antibacterial activity in the coating to further enhance its protection against microbial corrosion. Quaternary ammonium compounds possess some bactericidal properties and can be used in drinking water paints to improve the coating's antibacterial effect. However, when directly incorporated into the formulation, they tend to migrate within the cured epoxy system, reducing their long-term effectiveness. Summary of the Invention

[0004] To address the above problems, the technical problem to be solved by the present invention is to provide a solvent-free epoxy drinking water paint that has good adhesion, improved antibacterial properties, and long-lasting antibacterial effect.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A solvent-free epoxy drinking water paint, by weight, comprises 100 parts epoxy resin, 12-16 parts silane-modified quaternary ammonium salt, 8-12 parts reactive diluent, 15-20 parts pigments and fillers, 3-4 parts additives, 30-38 parts phenolic amine curing agent, 10-14 parts polyetheramine D230 curing agent, and 2-5 parts accelerator DMP-30.

[0007] As a further improvement of the present invention, the preparation method of the silane-modified quaternary ammonium salt is as follows: hydrogen-containing silicone oil and (3-allyloxy-2-hydroxy)propyltrimethylammonium chloride are dissolved in isopropanol, stirred and dissolved at 60°C, a platinum catalyst is added, nitrogen gas is purged, the temperature is raised to 80°C, the reaction is carried out for 4-6 hours, and the solvent is removed by vacuum distillation to obtain the silane-modified quaternary ammonium salt.

[0008] As a further improvement of the present invention, the molar ratio of the hydrogen-containing silicone oil to [3-allyloxy-2-hydroxy]propyltrimethylammonium chloride is 1:0.98.

[0009] As a further improvement of the present invention, the hydrogen-containing silicone oil is one or both of terminal hydrogen-containing silicone oil and side-chain hydrogen-containing silicone oil, and the hydrogen content of the hydrogen-containing silicone oil is 0.5-1.2%.

[0010] As a further improvement of the present invention, the amount of the platinum catalyst is 0.05% wt of the total solution volume.

[0011] As a further improvement of the present invention, the epoxy resin is E51, and the epoxy value is 0.51-0.54 eq / 100g.

[0012] As a further improvement of the present invention, the active diluent is 1,6-hexanediol diglycidyl ether.

[0013] As a further improvement of the present invention, the pigment or filler is one or both of titanium dioxide and talc.

[0014] As a further improvement of the present invention, the additives include leveling agent BYK-354, defoamer BYK-066N, and anti-settling agent fumed silica in a mass ratio of 0.5:0.5:1.5.

[0015] A method for preparing a solvent-free epoxy water-based paint, characterized by comprising the following preparation steps:

[0016] Epoxy resin, silane-modified quaternary ammonium salt, reactive diluent, pigments, fillers, and additives are mixed and stirred evenly to obtain component A;

[0017] Phenolic amine curing agent, polyether amine D230 curing agent and accelerator DMP-30 are mixed and stirred evenly to obtain component B;

[0018] Component A and component B are mixed, coated and cured to obtain epoxy drinking water paint.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The epoxy drinking water paint of this invention adds silane-modified quaternary ammonium salts, giving the epoxy resin cationic quaternary ammonium groups and hydrophobic siloxane segments. When the cationic quaternary ammonium groups come into contact with the cell wall of microorganisms, they disrupt the ion flow of the organism and cause the cell wall to rupture, thus causing the organism to lose its activity and playing an antibacterial role.

[0021] The silane-modified quaternary ammonium salt of the present invention contains hydroxyl groups, which participate in the reaction during the epoxy resin curing process to form an effective cross-linking network, making the quaternary ammonium salt less prone to migration in the cured epoxy system, thereby improving its long-lasting antibacterial effect. In addition, the introduction of siloxane segments has good hydrophobicity, which can reduce microbial adhesion and further improve the antibacterial effect. At the same time, the segments have good flexibility, which improves the flexibility and impact resistance of the cured epoxy resin. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described below with reference to examples.

[0023] Example 1

[0024] A solvent-free epoxy drinking water paint, by weight, comprises the following components: 100 parts epoxy resin E51 (epoxy value 0.51-0.54 eq / 100g), 12 parts silane-modified quaternary ammonium salt, 8 parts 1,6-hexanediol diglycidyl ether, 6 parts titanium dioxide, 9 parts talc, 0.6 parts leveling agent BYK-354, 0.6 parts defoamer (BYK-066N), 1.8 parts anti-settling agent fumed silica, 30 parts phenolic amine curing agent, 14 parts polyetheramine D230 curing agent, and 2 parts accelerator DMP-30.

[0025] The preparation method of silane-modified quaternary ammonium salt is as follows: 100g of hydrogen-containing silicone oil (0.5% hydrogen content) and 99g of (3-allyloxy-2-hydroxy)propyltrimethylammonium chloride are dissolved in 199g of isopropanol and stirred at 60℃ to dissolve. 0.05%wt of platinum catalyst is added to the total solution, nitrogen gas is purged, the temperature is raised to 80℃, and the reaction is carried out for 4-6 hours. The solvent is removed by vacuum distillation to obtain silane-modified quaternary ammonium salt.

[0026] A method for preparing a solvent-free epoxy water-based paint includes the following preparation steps:

[0027] Epoxy resin, silane-modified quaternary ammonium salt, reactive diluent, pigments, fillers, and additives are mixed and stirred evenly to obtain component A;

[0028] Phenolic amine curing agent, polyether amine D230 curing agent and accelerator DMP-30 are mixed and stirred evenly to obtain component B;

[0029] Component A and component B are mixed, coated and cured to obtain epoxy drinking water paint.

[0030] Example 2

[0031] A solvent-free epoxy drinking water paint, by weight, comprises the following components: 100 parts epoxy resin E51 (epoxy value 0.51-0.54 eq / 100g), 16 parts silane-modified quaternary ammonium salt, 12 parts 1,6-hexanediol diglycidyl ether, 8 parts titanium dioxide, 12 parts talc, 0.6 parts leveling agent BYK-354, 0.6 parts defoamer BYK-066N, 1.8 parts anti-settling agent fumed silica, 33 parts phenolic amine curing agent, 12 parts polyetheramine D230 curing agent, and 2 parts accelerator DMP-30.

[0032] The preparation method of silane-modified quaternary ammonium salt is the same as in Example 1.

[0033] The same method for preparing a solvent-free epoxy water-based paint as in Example 1.

[0034] Example 3

[0035] A solvent-free epoxy drinking water paint, by weight, comprises the following components: 100 parts epoxy resin E51 (epoxy value 0.51-0.54 eq / 100g), 16 parts silane-modified quaternary ammonium salt, 15 parts 1,6-hexanediol diglycidyl ether, 8 parts titanium dioxide, 12 parts talc, 0.8 parts leveling agent BYK-354, 0.8 parts dispersant BYK-110, 2.4 parts anti-settling agent fumed silica, 38 parts phenolic amine curing agent, 10 parts polyether amine D230 curing agent, and 5 parts accelerator DMP-30.

[0036] The preparation method of silane-modified quaternary ammonium salt is as follows: 100g of hydrogen-containing silicone oil (hydrogen content 1.2%) and 245g of (3-allyloxy-2-hydroxy)propyltrimethylammonium chloride are dissolved in 345g of isopropanol and stirred at 60℃. 0.05%wt of platinum catalyst is added to the solution, nitrogen gas is purged, the temperature is raised to 80℃, and the reaction is carried out for 4-6 hours. The solvent is removed by vacuum distillation to obtain silane-modified quaternary ammonium salt.

[0037] The same method for preparing a solvent-free epoxy water-based paint as in Example 1.

[0038] Comparative Example 1

[0039] Unlike Example 1, this example does not contain silane-modified quaternary ammonium salts.

[0040] The epoxy water-based paints of Examples 1-3 and Comparative Example 1 were applied by spraying two coats. After the dry film was formed, performance tests were conducted. The performance of the paint films of Examples 1-3 and Comparative Example 1 is shown in Table 1.

[0041] Table 1. Test results of Examples 1-3 and Comparative Example 1

[0042]

[0043] As can be seen from Table 1, the solvent-free epoxy drinking water paint of the present invention has good adhesion, hardness and water resistance, and its impact resistance, flexibility and antibacterial properties are significantly better than those of Comparative Example 1.

[0044] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should be covered by the patent of the present invention.

Claims

1. A solvent-free epoxy drinking water paint, characterized in that, By weight, it consists of the following components: 100 parts epoxy resin, 12-16 parts silane-modified quaternary ammonium salt, 8-12 parts reactive diluent, 15-20 parts pigments and fillers, 3-4 parts additives, 30-38 parts phenolic amine curing agent, 10-14 parts polyetheramine D230 curing agent, and 2-5 parts accelerator DMP-30.

2. The solvent-free epoxy drinking water paint according to claim 1, characterized in that, The preparation method of the silane-modified quaternary ammonium salt is as follows: hydrogen-containing silicone oil and (3-allyloxy-2-hydroxy)propyltrimethylammonium chloride are dissolved in isopropanol, stirred and dissolved at 60°C, a platinum catalyst is added, nitrogen gas is purged, the temperature is raised to 80°C, and the reaction is carried out for 4-6 hours. The solvent is removed by vacuum distillation to obtain the silane-modified quaternary ammonium salt.

3. The solvent-free epoxy drinking water paint according to claim 2, characterized in that, The molar ratio of the hydrogen-containing silicone oil to [3-allyloxy-2-hydroxy]propyltrimethylammonium chloride is 1:0.

98.

4. The solvent-free epoxy drinking water paint according to claim 2, characterized in that, The hydrogen-containing silicone oil is one or both of terminal hydrogen-containing silicone oil and side-chain hydrogen-containing silicone oil, and the hydrogen content of the hydrogen-containing silicone oil is 0.5-1.2%.

5. The solvent-free epoxy drinking water paint according to claim 5, characterized in that, The amount of platinum catalyst used is 0.05% wt of the total solution volume.

6. The solvent-free epoxy drinking water paint according to claim 2, characterized in that, The epoxy resin is E51, with an epoxy value of 0.51-0.54 eq / 100g.

7. The solvent-free epoxy drinking water paint according to claim 1, characterized in that, The active diluent is 1,6-hexanediol diglycidyl ether.

8. The solvent-free epoxy drinking water paint according to claim 1, characterized in that, The pigments and fillers are one or both of titanium dioxide and talc.

9. The solvent-free epoxy drinking water paint according to claim 1, characterized in that, The additives include leveling agent BYK-354, defoamer BYK-066N, and anti-settling agent fumed silica in a mass ratio of 0.5:0.5:1.

5.

10. A method for preparing a solvent-free epoxy drinking water paint according to any one of claims 1-9, characterized in that, The preparation steps include the following: Epoxy resin, silane-modified quaternary ammonium salt, reactive diluent, pigments, fillers, and additives are mixed and stirred evenly to obtain component A; Phenolic amine curing agent, polyether amine D230 curing agent and accelerator DMP-30 are mixed and stirred evenly to obtain component B; Component A and component B are mixed, coated and cured to obtain epoxy drinking water paint.

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