Water-based anti-icing coating for rail traffic window glass and preparation method of water-based anti-icing coating

Abstract

The invention relates to a water-based anti-icing coating for rail traffic vehicle window glass and a preparation method thereof.The water-based anti-icing coating is formed by combining a component A resin paint and a component B curing agent according to the weight ratio of 2: 1, the component A resin paint comprises, by weight, 25-40 parts of polyurethane resin, 40-50 parts of fluorosilicone resin and 0.2-1 part of dispersing agent; the coating is prepared from the following components in parts by weight: 3 to 6 parts of organic silicon compound, 0.5 to 2 parts of ultraviolet light absorber, 0.5 to 3 parts of anti-settling agent, 0.3 to 0.7 part of defoaming agent, 0.4 to 0.9 part of wetting flatting agent and 5 to 15 parts of solvent A; and the component B curing agent comprises the following components in parts by weight: 50-70 parts of curing agent and 30-50 parts of solvent B. Compared with the prior art, the water-based anti-icing coating prepared by the invention has an excellent high-hardness paint film and a good scratch-resistant effect.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a water-based anti-icing coating for rail transit vehicle window glass and a preparation method thereof. Background Art

[0002] As an important coating, varnish has functions such as decoration and protection, and is closely related to our lives. With the increasing development of rail transit, it not only facilitates people's travel, but also speeds up the frequency of rail transit use.

[0003] Anti-icing coating is a technology applied to the surface of glass. Its main function is to reduce the adhesion of pollutants in rail transit and ice formation in low temperature weather. The emergence of this technology is closely related to anti-reflection film. When photovoltaic modules leave the factory, a layer of anti-reflection coating is plated on their glass components. In addition to improving the power generation efficiency of photovoltaic modules, this coating can also inhibit the precipitation of calcium and sodium structures on the surface of the glass. Due to the microporous structure of glass, calcium and sodium substances precipitate over time, which can easily absorb pollutants and water vapor in the air, making cleaning difficult. Low temperature weather can also cause ice on the glass surface. In order to solve this current problem of rail transit, a layer of anti-icing coating can be plated on the glass surface of rail transit.

[0004] The principle of anti-icing coating is to use a room temperature curing process to coat the coating on the glass surface, thereby covering the porous structure of the glass and reducing the contact area between water, oil and other objects and the mirror surface. Studies have found that the de-icing shear force will increase with the increase of the ice area. The larger the area, the more difficult it is to de-ice. Low surface energy materials can reduce the adhesion of ice layers compared to high surface energy hydrophilic materials. Secondly, the coating can improve the roughness of the glass surface, not only improving the light transmittance of the glass, but also reducing the adhesion of oil, dust and water vapor.

[0005] The material of traditional anti-icing coating is low surface energy hydrophobic resin, similar to polytetrafluoroethylene, fluorocarbon resin, silicone rubber, etc. Most of the existing anti-icing coatings have problems such as scratch resistance, poor adhesion, and poor yellowing resistance. This makes the anti-icing coating easy to fall off in a short time after use, and the paint film turns yellow, which not only increases the later maintenance cost, but also causes great safety hazards. In response to the above problems, the Chinese invention patent with application number CN201811059765.7 discloses a method for preparing a fluorosilicone anti-icing coating. The composition of the fluorosilicone anti-icing coating is: 40-60 parts of fluorosilicone resin, 10-15 parts of conductive filler, 5-15 parts of zein, 90-110 parts of ethanol aqueous solution, 2-5 parts of glycerol, 1-8 parts of organosilicon compound, 0.5-3 parts of anti-aging agent, 0.5-5 parts of dispersant, 0.5-3 parts of anti-settling agent, and 10-40 parts of organic solvent. The technical content disclosed in the above patent uses fluorosilicone resin with excellent anti-icing performance. However, when fluorosilicone resin’s excellent anti-icing properties are applied to glass, its adhesion is poor and its scratch resistance is average. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a water-based anti-icing coating for rail transit vehicle window glass and a preparation method thereof.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] One of the technical solutions of the present invention is to provide a water-based anti-icing coating, which is composed of a component A resin paint and a component B curing agent in a weight ratio of 2:1.

[0009] Wherein, the resin paint of component A comprises the following components in parts by weight:

[0010]

[0011] The second component curing agent includes the following components in parts by weight:

[0012] Curing agent 50-70 parts,

[0013] Solvent B 30-50 parts.

[0014] In some specific embodiments, the component A resin paint includes the following components in parts by weight:

[0015]

[0016]

[0017] The component B curing agent includes the following components in parts by weight:

[0018] Curing agent 55-65 parts,

[0019] Solvent B 35-43 parts.

[0020] In some specific embodiments, the polyurethane resin is a water-based high molecular weight polyurethane resin with a solid content of 35 to 45%.

[0021] Preferably, the polyurethane resin is 2816 polyurethane emulsion with a solid content of 35-45% and a pH of 6-8. It has the characteristics of good adhesion, good water and salt spray resistance, good interlayer adhesion, high gloss and brightness, excellent weather resistance, good leveling, etc. It has good compatibility with fluorosilicone resin, does not affect transparency, and can effectively enhance the adhesion of the paint film after mixing.

[0022] In some specific embodiments, the fluorosilicone resin is a water-based fluorosilicone resin with a solid content of 45-55%.

[0023] Preferably, the fluorosilicone resin is SH-9609 polyurethane emulsion with a solid content of 50-55%, which has the characteristics of good adhesion, self-drying in greenhouse, good interlayer adhesion, good physical and mechanical properties, etc.

[0024] In some specific embodiments, the dispersant is a sodium salt of polycarboxylate, the anti-settling agent is selected from any one of fumed silica or polyamide wax, the defoaming agent is a modified polysiloxane free of aromatic hydrocarbons, the leveling agent is a polyether-modified silicone, the silicone compound is silica with an organically treated surface, and the curing agent is an HDI trimer with TDI <0.4% and free of aromatic hydrocarbons.

[0025] Preferably, the dispersant is LOPON800, which is easy to add, has zero VOC, has excellent dispersing power, can obtain high-solid coatings, has good storage stability, is not easy to re-coarse, and has high gloss.

[0026] Preferably, the anti-settling agent is MT6900-20X, which has excellent thixotropic properties and good dispersibility, forms a strong network structure in the coating, and is conducive to the stable arrangement of the organosilicon compound.

[0027] Preferably, the defoaming agent is TEGO 901W, which can effectively prevent the generation of bubbles caused by mechanical forces during mixing, manufacturing and application.

[0028] Preferably, the leveling agent is BYK-333, which can effectively enhance the smoothness of the coating surface, improve the wettability of the substrate, has good anti-cratering performance, and can effectively increase the surface smoothness, scratch resistance, and anti-adhesion properties.

[0029] Preferably, the organosilicon compound is KH 550, an organically treated silicon dioxide with a particle size of 5 microns, a smooth surface feel, strong hydrophobicity, and good stability.

[0030] Preferably, the curing agent is BTH-03, which has the characteristics of low curing temperature, good adhesion, good flexibility, good water resistance, etc.

[0031] In some specific embodiments, the solvent A and the solvent B are selected from any one or more of butyl acetate, ethyl acetate, isobutyl acetate, dibasic acid ester (DBE) or ethanol, and propylene glycol methyl ether.

[0032] Preferably, the solvent A and solvent B are selected from any one of a mixed solvent of ethyl acetate, propylene glycol methyl ether and ethanol in a weight ratio of 1:2:1, a mixed solvent of propylene glycol methyl ether and ethanol in a weight ratio of 2:1, and a mixed solvent of a dibasic acid ester mixture and ethyl acetate in a weight ratio of 1:1.

[0033] A second technical solution of the present invention is to provide a method for preparing a water-based anti-icing coating as described in one of the above technical solutions, comprising the following steps:

[0034] S1. Add solvent A by weight into a dispersion kettle, add polyurethane resin and fluorosilicone resin and stir evenly, then add dispersant and organosilicon compound, stir at high speed, then add anti-settling agent, defoamer, leveling agent, ultraviolet light absorber, stir at low speed for 10-15min, adjust viscosity to 25-40s, filter, and obtain component A resin paint;

[0035] S2, adding the curing agent to the solvent B according to parts by weight, stirring evenly, to obtain the component B curing agent;

[0036] S3. Evenly mix the resin paint of component A and the curing agent of component B in a weight ratio of 2:1 to obtain a water-based anti-icing coating.

[0037] In some specific embodiments, in step S1, the rotation speed of the high-speed stirring is 500-800 rpm, and the time is 20-30 min.

[0038] In some specific embodiments, in step S1, the rotation speed of the low-speed stirring is 100-400 rpm, and the time is 10-15 min.

[0039] The third technical solution of the present invention is to provide an application of a water-based anti-icing coating as described in one of the above technical solutions, wherein the water-based anti-icing coating is used to be coated on rail transit vehicle window glass as an anti-icing layer.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The present invention selects polyurethane resin 2816 with good compatibility and fluorosilicone resin SH-9609 for use, and uses BTH-03 as a curing agent, while ensuring the light transmittance, toughness and hardness of the paint film.

[0042] (2) The formula design of the present invention takes into account the hardness, toughness and hydrophobicity of the paint film while ensuring the performance of the paint film. The addition of leveling agent BYK-333 can effectively improve the smoothness of the paint surface. The resulting paint has an excellent high-hardness paint film and good anti-scratch effect.

[0043] (3) The water-based anti-icing coating prepared by the present invention can be cured at room temperature and is easy to spray, which reduces the difficulty of construction. At the same time, the combination of polyurethane resin 2816 and fluorosilicone resin SH-9609 also extends the service life of the existing coating, enhances the safety of later use and maintenance costs. DETAILED DESCRIPTION

[0044] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0045] In the following examples and comparative examples, unless otherwise specified, raw materials or processing techniques are conventional commercially available raw materials or conventional processing techniques in the art.

[0046] Embodiment 1:

[0047] This embodiment 1 provides a water-based anti-icing coating for rail transit vehicle window glass, which is composed of a component A resin paint and a component B curing agent in a weight ratio of 2:1;

[0048] Among them, the resin paint of component A includes the following components and their contents by weight:

[0049]

[0050] The component B curing agent includes the following components and contents by weight:

[0051] BTH-03 65 copies,

[0052] Solvent B 45 parts.

[0053] Solvent A is propylene glycol methyl ether solvent, and solvent B is a dibasic ester mixture (DBE).

[0054] This embodiment also provides a method for preparing the water-based anti-icing coating for rail transit vehicle window glass, which specifically includes the following steps:

[0055] (1) Add solvent A by weight to a dispersion kettle, add polyurethane resin and fluorosilicone resin and stir evenly, then add dispersant and organosilicon compound, stir at 960 rpm for 30 min, then reduce the speed to 600 rpm, add anti-settling agent, defoamer, leveling agent, ultraviolet light absorber, stir for 10 min, adjust the viscosity to 38s (Tu-4 viscometer), filter, and obtain component A resin paint;

[0056] (2) adding the curing agent to solvent B according to parts by weight and stirring evenly to obtain component B curing agent;

[0057] (3) The resin paint of component A and the curing agent of component B are mixed evenly in a weight ratio of 2:1 to prepare a water-based anti-icing coating.

[0058] This embodiment is applied on tinplate sprayed with color paint (surface dry), and the test results of paint film performance are shown in Table 1.

[0059] Table 1 Paint film performance test results

[0060]

[0061] Embodiment 2:

[0062] This embodiment 2 provides a water-based anti-icing coating for rail transit vehicle window glass, which is composed of a component A resin paint and a component B curing agent in a weight ratio of 2:1;

[0063] Among them, the resin paint of component A includes the following components and their contents by weight:

[0064]

[0065]

[0066] The component B curing agent includes the following components and contents by weight:

[0067] BTH-03 56 copies,

[0068] Solvent B 43 parts.

[0069] Solvent A is a mixed solvent of propylene glycol methyl ether and ethanol in a weight ratio of 2:1, and solvent B is a dibasic acid ester mixture (DBE).

[0070] This embodiment 2 also provides a method for preparing the above-mentioned water-based anti-icing coating for rail transit vehicle window glass, which specifically includes the following steps:

[0071] (1) Add solvent A by weight to a dispersion kettle, add polyurethane resin and fluorosilicone resin and stir evenly, then add dispersant and organosilicon compound, stir at 860 rpm for 30 min, then reduce the speed to 450 rpm, add anti-settling agent, defoamer, leveling agent, ultraviolet light absorber, stir for 10 min, adjust the viscosity to 28s (Tu-4 viscometer), filter, and obtain component A resin paint;

[0072] (2) adding the curing agent to solvent B according to parts by weight and stirring evenly to obtain component B curing agent;

[0073] (3) The resin paint of component A and the curing agent of component B are mixed evenly in a weight ratio of 2:1 to prepare a water-based anti-icing coating.

[0074] Embodiment 3:

[0075] This embodiment 3 provides a water-based anti-icing coating for rail transit vehicle window glass, which is composed of a component A resin paint and a component B curing agent in a weight ratio of 2:1;

[0076] Among them, the resin paint of component A includes the following components and their contents by weight:

[0077]

[0078]

[0079] The component B curing agent includes the following components and contents by weight:

[0080] BTH-03 56 copies,

[0081] Solvent B 43 parts.

[0082] Solvent A is a mixed solvent of propylene glycol methyl ether and ethanol in a weight ratio of 2:1, and solvent B is a dibasic acid ester mixture (DBE).

[0083] This embodiment 3 also provides a method for preparing the above-mentioned water-based anti-icing coating for rail transit vehicle window glass, which specifically includes the following steps:

[0084] (1) Add solvent A by weight to a dispersion kettle, add polyurethane resin and fluorosilicone resin and stir evenly, then add dispersant and organosilicon compound, stir at 860 rpm for 30 min, then reduce the speed to 450 rpm, add anti-settling agent, defoamer, leveling agent, ultraviolet light absorber, stir for 10 min, adjust the viscosity to 28s (Tu-4 viscometer), filter, and obtain component A resin paint;

[0085] (2) adding the curing agent to solvent B according to parts by weight and stirring evenly to obtain component B curing agent;

[0086] (3) The resin paint of component A and the curing agent of component B are mixed evenly in a weight ratio of 2:1 to prepare a water-based anti-icing coating.

[0087] Embodiment 4:

[0088] This embodiment 4 provides a water-based anti-icing coating for rail transit vehicle window glass, which is composed of a component A resin paint and a component B curing agent in a weight ratio of 2:1;

[0089] Among them, the resin paint of component A includes the following components and their contents by weight:

[0090]

[0091] The component B curing agent includes the following components and contents by weight:

[0092] BTH-03 54 copies,

[0093] Solvent B 43 parts.

[0094] Solvent A is a mixed solvent of propylene glycol methyl ether and ethanol in a weight ratio of 1:1, and solvent B is a dibasic acid ester mixture (DBE).

[0095] This embodiment 4 also provides a method for preparing the above-mentioned water-based anti-icing coating for rail transit vehicle window glass, which specifically includes the following steps:

[0096] (1) Add solvent A by weight into a dispersion kettle, add polyurethane resin and fluorosilicone resin and stir evenly, then add dispersant and organosilicon compound, stir at a high speed of 680 rpm for 20 min, then reduce the speed to 200 rpm, add anti-settling agent, defoamer, leveling agent, ultraviolet light absorber, stir for 30 min, adjust the viscosity to 38s (Tu-4 viscometer), filter, and obtain component A resin paint;

[0097] (2) adding the curing agent to solvent B according to parts by weight and stirring evenly to obtain component B curing agent;

[0098] (3) The resin paint of component A and the curing agent of component B are mixed evenly in a weight ratio of 2:1 to prepare a water-based anti-icing coating.

[0099] Embodiment 5:

[0100] This embodiment 5 provides a water-based anti-icing coating for rail transit vehicle window glass, which is composed of a component A resin paint and a component B curing agent in a weight ratio of 2:1;

[0101] Among them, the resin paint of component A includes the following components and their contents by weight:

[0102]

[0103] The component B curing agent includes the following components and contents by weight:

[0104] BTH-03 56 copies,

[0105] Solvent B 43 parts.

[0106] Solvent A is ethanol, and solvent B is a mixed solvent consisting of a dibasic acid ester mixture (DBE) and ethyl acetate in a weight ratio of 1:1.

[0107] This embodiment 5 also provides a method for preparing the above-mentioned water-based anti-icing coating for rail transit vehicle window glass, which specifically includes the following steps:

[0108] (1) Add solvent A by weight into a dispersion kettle, add polyurethane resin and fluorosilicone resin and stir evenly, then add dispersant and organosilicon compound, stir at 600 rpm for 20 min, then reduce the speed to 300 rpm, add anti-settling agent, defoamer, leveling agent, ultraviolet light absorber, stir for 30 min, adjust the viscosity to 30s (Tu-4 viscometer), filter, and obtain component A resin paint;

[0109] (2) adding the curing agent to solvent B according to parts by weight and stirring evenly to obtain component B curing agent;

[0110] (3) The resin paint of component A and the curing agent of component B are mixed evenly in a weight ratio of 2:1 to prepare a water-based anti-icing coating.

[0111] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A water-based anti-icing coating, characterized in that: It is composed of component A resin paint and component B curing agent in a weight ratio of 2:

1. Wherein, the resin paint of component A comprises the following components in parts by weight: The second component curing agent includes the following components in parts by weight: Curing agent 50-70 parts, Solvent B 30-50 parts.

2. The water-based anti-icing coating according to claim 1, characterized in that: The resin paint of component A comprises the following components in parts by weight: The component B curing agent includes the following components in parts by weight: Curing agent 55-65 parts, Solvent B 35-43 parts.

3. The water-based anti-icing coating according to claim 1, characterized in that: The polyurethane resin is a water-based high molecular weight polyurethane resin with a solid content of 35-45%.

4. The water-based anti-icing coating according to claim 1, characterized in that: The fluorosilicone resin is a water-based fluorosilicone resin with a solid content of 45-55%.

5. The water-based anti-icing coating according to claim 1, characterized in that: The dispersant is sodium salt of polycarboxylate, the anti-settling agent is selected from any one of fumed silica or polyamide wax, the defoamer is modified polysiloxane free of aromatic hydrocarbons, the leveling agent is polyether modified silicone, the silicone compound is silica with an organically treated surface, and the curing agent is HDI trimer with TDI <0.4% and free of aromatic hydrocarbons.

6. The water-based anti-icing coating according to claim 1, characterized in that: The solvent A and the solvent B are selected from any one or more of butyl acetate, ethyl acetate, isobutyl acetate, dibasic acid ester or ethanol, and propylene glycol methyl ether.

7. A method for preparing a water-based anti-icing coating according to any one of claims 1 to 6, characterized in that: The steps include: S1. Add solvent A by weight into a dispersion kettle, add polyurethane resin and fluorosilicone resin and stir evenly, then add dispersant and organosilicon compound, stir at high speed, then add anti-settling agent, defoamer, leveling agent, ultraviolet light absorber, stir at low speed for 10-15min, adjust viscosity to 25-40s, filter, and obtain component A resin paint; S2, adding the curing agent to the solvent B according to parts by weight, stirring evenly, to obtain the component B curing agent; S3. Evenly mix the resin paint of component A and the curing agent of component B in a weight ratio of 2:1 to obtain a water-based anti-icing coating.

8. The preparation method according to claim 7, characterized in that: In step S1, the rotation speed of the high-speed stirring is 500-800 rpm, and the time is 20-30 min.

9. The preparation method according to claim 7, characterized in that: In step S1, the rotation speed of low-speed stirring is 100-400 rpm, and the time is 10-15 min.

10. A use of the water-based anti-icing coating according to any one of claims 1 to 6, characterized in that: The water-based anti-icing coating is used for coating on rail transit vehicle window glass as an anti-icing layer.

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