阅读说明：本技术 一种高固含低voc耐磨漆及其制备方法 (High-solid-content low-VOC (volatile organic compound) wear-resistant paint and preparation method thereof ) 是由 周学军 于 2020-11-11 设计创作，主要内容包括：本发明属于涂料技术领域。一种高固含低VOC耐磨漆,包括以下按质量份数计算的组分：水性环氧树脂30-45份、水性丙烯酸改性环氧磷酸树脂15-20份、固化剂20-30份、改性填料5-30份、有机膨润土10-15份、助剂0.1-3份、水5-20份。本发明耐磨漆粘度低、固含高、VOC含量低,漆膜对基材的附着力高,柔韧性好,耐盐雾、耐湿热、耐酸碱性能优异。(The invention belongs to the technical field of coatings. The high-solid-content low-VOC wear-resistant paint comprises the following components in parts by mass: 30-45 parts of waterborne epoxy resin, 15-20 parts of waterborne acrylic modified epoxy phosphoric acid resin, 20-30 parts of curing agent, 5-30 parts of modified filler, 10-15 parts of organic bentonite, 0.1-3 parts of auxiliary agent and 5-20 parts of water. The wear-resistant paint disclosed by the invention is low in viscosity, high in solid content, low in VOC (volatile organic compounds) content, high in adhesion of a paint film to a base material, good in flexibility, salt mist resistant, damp and heat resistant, and excellent in acid and alkali resistance.)

1. The high-solid-content low-VOC wear-resistant paint is characterized by comprising the following components in parts by mass: 30-45 parts of waterborne epoxy resin, 15-20 parts of waterborne acrylic modified epoxy phosphoric acid resin, 20-30 parts of curing agent, 5-30 parts of modified filler, 10-15 parts of organic bentonite, 0.1-3 parts of auxiliary agent and 5-20 parts of water.

2. The high-solids, low-VOC, abrasion resistant paint of claim 1, wherein said aqueous epoxy resin is 1, 1-bis (4-hydroxyphenyl) cyclohexane diglycidyl ether.

3. The high-solid low-VOC wear-resistant paint according to claim 1, wherein the curing agent is prepared from the following components in parts by weight: 0.5-1 part of phenyl isocyanate, 1-2 parts of polyethylene oxide-2-octadecanol ether, 0.5-1 part of 1-ethyl-3-methylimidazol dicyanamide, 1-2 parts of dimethylethanolamine and 3-5 parts of cellulose.

4. The high-solid low-VOC wear-resistant paint according to claim 3, wherein said curing agent is prepared by a method comprising the steps of:

s1, mixing cellulose and a 5% sodium hydroxide solution according to a mass ratio of 1: 2-3, stirring for 30-1h, standing for activation for 6-12h, filtering, drying, grinding and sieving;

s2, dissolving phenyl isocyanate in dichloromethane, heating to 60-65 ℃, keeping the temperature constant, dropwise adding polyethylene oxide-2-octadecanol ether for 1.5-2h, and reacting for 1.5-2.5h at constant temperature after dropwise adding;

s3, heating to 85-90 ℃, adding 1-ethyl-3-methylimidazol dicyanamide, stirring and reacting for 1.5-2.5h, adding dimethylethanolamine, and stirring and reacting for 1.5-2.5 h;

and S4, adding the activated cellulose, and stirring and reacting for 1-2 h.

5. The high-solid low-VOC wear-resistant paint according to claim 1, wherein the modified filler is prepared by the following steps: 8-11 parts of filler and 15-20 parts of chitosan are dissolved in 120 parts of 2-5% acetic acid aqueous solution with concentration of 100 and uniformly mixed to prepare a mixed solution a; dissolving 18-25 parts of sodium citrate in 75-150 parts of sodium hydroxide aqueous solution with the concentration of 1-1.5% to prepare mixed solution b; and (3) dropwise adding the mixed solution b into the mixed solution a, soaking and crosslinking for 10-16h, and drying and grinding to obtain the modified filler.

6. The high-solid low-VOC wear-resistant paint according to claim 5, characterized in that the filler is a mixture of 1-2: 2-3: 1-3 of titanium dioxide, zirconium phosphate and hollow glass microspheres.

7. The high-solid-content low-VOC wear-resistant paint according to claim 1, characterized in that the organic bentonite is dodecyl dimethyl benzyl ammonium bromide modified bentonite or cetyl pyridine bromide modified bentonite.

8. The high-solid low-VOC wear-resistant paint according to claim 1, wherein said auxiliaries comprise defoaming agents, leveling agents, dispersing agents.

9. The high-solids, low-VOC, abrasion resistant paint according to claim 8, wherein said defoamer is an aqueous non-silicone fatty acid polymer or polyoxyethylene ether; the leveling agent is organic silicon modified polysiloxane; the dispersing agent is an organic silicon anionic surfactant.

10. The preparation method of the high-solid-content low-VOC wear-resistant paint according to any one of claims 1-9, characterized by adding the water-based epoxy resin and the water-based acrylic acid modified epoxy phosphoric acid resin into water, stirring for 20-30min, adding the modified filler and the organic bentonite, stirring for 30-60min, then performing dispersion grinding for 60-90min, filtering with a 200-mesh filter screen, adding the curing agent and the auxiliary agent into the filtrate, and stirring for 30-40 min.

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to a high-solid-content low-VOC wear-resistant paint and a preparation method thereof.

Background

The traditional epoxy resin coating has the advantages of high adhesive force, excellent corrosion resistance and solvent resistance, high hardness, good wear resistance and the like, but an organic solvent is required to be used in the using process, so that the system contains organic volatile matters, which not only can cause serious pollution to the environment, but also has great threat to the health of human bodies. The existing water-based epoxy coating has the advantages of no air pollution, safety, no toxicity, convenient construction and the like, but has the problems of uneven curing, low toughness and strength of a paint film, poor wear resistance and the like.

Disclosure of Invention

The invention aims to solve the technical problem of providing the wear-resistant paint with high solid content and low VOC, which has the advantages of low viscosity, high solid content, low VOC content, high adhesion of a paint film to a base material, good flexibility, salt mist resistance, humidity resistance, acid and alkali resistance.

The technical scheme of the invention is as follows:

the high-solid-content low-VOC wear-resistant paint comprises the following components in parts by mass: 30-45 parts of waterborne epoxy resin, 15-20 parts of waterborne acrylic modified epoxy phosphoric acid resin, 20-30 parts of curing agent, 5-30 parts of modified filler, 10-15 parts of organic bentonite, 0.1-3 parts of auxiliary agent and 5-20 parts of water.

Further, the water-based epoxy resin is 1, 1-bis (4-hydroxyphenyl) cyclohexane diglycidyl ether.

Further, the 1, 1-bis (4-hydroxyphenyl) cyclohexane diglycidyl ether is prepared by carrying out polymerization reaction on 1, 1-bis (4-hydroxyphenyl) cyclohexane and excessive epichlorohydrin under the condition of sodium hydroxide.

Further, the curing agent is prepared from the following components in parts by weight: 0.5-1 part of phenyl isocyanate, 1-2 parts of polyethylene oxide-2-octadecanol ether, 0.5-1 part of 1-ethyl-3-methylimidazol dicyanamide, 1-2 parts of dimethylethanolamine and 3-5 parts of cellulose.

Further, the preparation method of the curing agent comprises the following steps:

s1, mixing cellulose and a 5% sodium hydroxide solution according to a mass ratio of 1: 2-3, stirring for 30-1h, standing for activation for 6-12h, filtering, drying, grinding and sieving;

s2, dissolving phenyl isocyanate in dichloromethane, heating to 60-65 ℃, keeping the temperature constant, dropwise adding polyethylene oxide-2-octadecanol ether for 1.5-2h, and reacting for 1.5-2.5h at constant temperature after dropwise adding;

s3, heating to 85-90 ℃, adding 1-ethyl-3-methylimidazol dicyanamide, stirring and reacting for 1.5-2.5h, adding dimethylethanolamine, and stirring and reacting for 1.5-2.5 h;

and S4, adding the activated cellulose, and stirring and reacting for 1-2 h.

Further, the preparation method of the modified filler comprises the following steps: 8-11 parts of filler and 15-20 parts of chitosan are dissolved in 120 parts of 2-5% acetic acid aqueous solution with concentration of 100 and uniformly mixed to prepare a mixed solution a; dissolving 18-25 parts of sodium citrate in 75-150 parts of sodium hydroxide aqueous solution with the concentration of 1-1.5% to prepare mixed solution b; and (3) dropwise adding the mixed solution b into the mixed solution a, soaking and crosslinking for 10-16h, and drying and grinding to obtain the modified filler.

Further, the filler is prepared from the following components in a mass ratio of 1-2: 2-3: 1-3 of titanium dioxide, zirconium phosphate and hollow glass microspheres.

Furthermore, the organic bentonite is dodecyl dimethyl benzyl ammonium bromide modified bentonite or cetyl pyridine bromide modified bentonite.

Furthermore, the auxiliary agent comprises a defoaming agent, a leveling agent and a dispersing agent.

Further, the defoaming agent is an aqueous non-silicone fatty acid polymer or polyoxyethylene ether; the leveling agent is organic silicon modified polysiloxane; the dispersing agent is an organic silicon anionic surfactant.

Adding water-based epoxy resin and water-based acrylic acid modified epoxy phosphoric acid resin into water, stirring for 20-30min, adding an auxiliary agent, a modified filler and organic bentonite, stirring for 30-60min, then performing dispersion grinding for 60-90min, filtering by using a 200-mesh filter screen, adding a curing agent into the filtrate, and stirring for 30-40 min.

The invention has the following beneficial effects:

the water-based epoxy resin selected by the invention has low viscosity, high solid content and low VOC content, and can be used as a main film forming substance to improve the water resistance, acid and alkali resistance, salt spray corrosion resistance and scratch and wear resistance of a paint film. The selected waterborne acrylic acid modified epoxy phosphoric acid resin can improve the adhesive force of the paint film to the base material and the flexibility of the paint film. The selected curing agent has low viscosity, high solid content and high VOC content, can improve the curing speed and the film forming performance of the coating, has good compatibility with main resin, has high crosslinking density, good toughness and high glossiness after the paint film is cured, and greatly improves the flexibility, the water resistance, the salt spray resistance, the humidity and heat resistance and the acid and alkali resistance of the paint film because the molecular structure of the curing agent contains a hydrophilic long-chain structure and an epoxy-polyamine short-chain structure.

Detailed Description

The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.

Examples

The following table is a formula table (unit: parts) for 3 examples of high solids, low VOC abrasion resistant paints according to the invention:

the curing agent is prepared from the following components in parts by mass: 0.5 part of phenyl isocyanate, 1 part of polyoxyethylene-2-octadecanol ether, 0.5 part of 1-ethyl-3-methylimidazol dicyanamide, 1 part of dimethylethanolamine and 3 parts of cellulose;

the preparation method of the curing agent comprises the following steps:

s1, mixing cellulose and a 5% sodium hydroxide solution according to a mass ratio of 1: 2, mixing, stirring for 30h, standing and activating for 6h, filtering, drying, grinding and sieving;

s2, dissolving phenyl isocyanate in dichloromethane, heating to 60 ℃ and keeping the temperature constant, dropwise adding polyethylene oxide-2-octadecanol ether for 1.5h, and reacting for 1.5h at the constant temperature after dropwise adding;

s3, heating to 85 ℃, adding 1-ethyl-3-methylimidazol dicyanamide, stirring and reacting for 1.5h, adding dimethylethanolamine, and stirring and reacting for 1.5 h;

and S4, adding the activated cellulose, and stirring and reacting for 1 h.

The preparation method of the modified filler comprises the following steps: 8 parts of filler and 15 parts of chitosan are dissolved in 100 parts of 2% acetic acid aqueous solution, and mixed uniformly to prepare a mixed solution a; dissolving 18 parts of sodium citrate in 75 parts of 1% sodium hydroxide aqueous solution to prepare a mixed solution b; dropwise adding the mixed solution b into the mixed solution a, soaking and crosslinking for 10 hours, and drying and grinding to obtain a modified filler; the filler is prepared from the following components in a mass ratio of 1: 2: 3 titanium dioxide, zirconium phosphate and hollow glass microspheres.

Adding water-based epoxy resin and water-based acrylic acid modified epoxy phosphoric acid resin into water, stirring for 20min, adding an auxiliary agent, a modified filler and organic bentonite, stirring for 30min, then carrying out dispersion grinding for 60min, filtering by using a 200-mesh filter screen, adding a curing agent into the filtrate, and stirring for 30 min.

Comparative example

The following table is a formula table (unit: parts) for 5 examples of high solids, low VOC abrasion resistant paints according to the invention:

wherein the filler is prepared from the following components in a mass ratio of 1: 2: 3 titanium dioxide, zirconium phosphate and hollow glass microspheres.

The high solids, low VOC, abrasion resistant paints of the present invention were tested for each of the properties of 3 comparative examples and 5 examples, with the results shown in tables 1-2 below:

TABLE 1

TABLE 2

Therefore, the wear-resistant paint disclosed by the invention has the advantages of low viscosity, high solid content, low VOC, high hardness of a paint film, good adhesion, good flexibility, impact resistance, scratch resistance, wear resistance, salt spray resistance and acid and alkali resistance.