A water-based silicone resin coating

Abstract

The present invention belongs to the field of building materials technology, and specifically relates to a water-based organosilicon resin coating. Inorganic coatings for building walls often contain large amounts of inorganic titanium dioxide, which has poor compatibility with organic resin matrices and can easily crack the coating. To address this issue, the present invention provides a water-based organosilicon resin coating, the formulation of which incorporates a modified titanium dioxide structure. The long-chain polyether resin segments in the modified titanium dioxide structure are organic, imparting greater flexibility to the modified titanium dioxide and significantly improving the coating's crack resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a water-based organosilicon resin coating. Background Art

[0002] Wall coatings must not only meet decorative requirements but also possess functional properties such as thermal insulation, antibacterial properties, and crack resistance. However, currently, there are very few inorganic coatings for interior and exterior walls on the market, and their performance falls short of these requirements. Inorganic coatings for building walls often contain large amounts of inorganic titanium dioxide, which has poor compatibility with organic resin matrices, making the coatings prone to cracking. Summary of the Invention

[0003] A problem with existing technologies is that inorganic coatings for building walls often contain large amounts of inorganic titanium dioxide, which has poor compatibility with organic resin matrices and can easily cause the coating to crack. To address this problem, the present invention provides a water-based silicone resin coating comprising the following components, measured in parts by weight:

[0004] 300-350 parts of water-based silicone resin;

[0005] 150-200 parts of modified titanium dioxide;

[0006] 50-100 parts of heavy calcium powder;

[0007] 20-50 parts of kaolin;

[0008] 60-75 parts of silica fume;

[0009] 1-5 parts of hydroxyethyl cellulose;

[0010] 1-2 parts of bentonite;

[0011] 1-2 parts of defoaming agent;

[0012] 4-7 parts of ammonium salt dispersant;

[0013] 1-3 parts of environmentally friendly wetting agent;

[0014] 1-2 parts of fungicide;

[0015] 150-200 parts of water.

[0016] Specifically, the preparation method of the modified titanium dioxide comprises the following steps:

[0017] (1) Add 1 g of silane-modified polyether resin to 100 mL of ethanol-water solution (the mass ratio of ethanol to water is 4:1), stir and hydrolyze at 60 °C for 2 h to obtain a hydrolyzate;

[0018] (2) Add 2 g of titanium dioxide to 100 mL of ethanol-water solution, wherein the volume ratio of ethanol to water is 9:1, and stir at room temperature for 20-30 minutes to obtain a titanium dioxide dispersion;

[0019] (3) The hydrolyzate obtained in step (1) and the titanium dioxide dispersion obtained in step (2) were mixed evenly, and stirred at room temperature for 2 h. Thereafter, the reaction product was placed in an oven and dried at 70° C. for 12 h to obtain modified titanium dioxide.

[0020] Specifically, the average particle size of the heavy calcium powder is 800-1250 mesh.

[0021] Specifically, the average particle size of the kaolin is 800-1250 meshes.

[0022] Specifically, the average particle size of the silica fume powder is 800-1250 mesh.

[0023] Specifically, the bentonite includes at least one of sodium-based bentonite and calcium-based bentonite.

[0024] Specifically, the defoaming agent is a metal soap defoaming agent.

[0025] Specifically, the ammonium salt dispersant includes at least one of Mairui New Material 5027 dispersant, BXZ-210 ammonium salt dispersant, 8527 ammonium salt dispersant, and HTK-5057 ammonium salt dispersant.

[0026] Specifically, the environmentally friendly wetting agent includes at least one of HY-352, PD-405, and EW-100.

[0027] The present invention has the following beneficial effects:

[0028] (1) The water-based silicone resin coating of the present invention comprises titanium dioxide functionalized with a silane-modified polyether resin, the molecular structure of which is as follows: ,

[0029] During the hydrolysis process of silane-modified polyether resin, [-Si(OH)3] groups are generated, which chemically associate with [Si-OH] on the surface of titanium dioxide to produce [Si-O-Si] bonds. The modified titanium dioxide structure contains polyether resin segments, which give titanium dioxide better hydrophilicity, making it more evenly dispersed in the coating system and less likely to settle in the coating system, which is very beneficial to improving the overall performance of the coating.

[0030] (2) The long chain segment of polyether resin in the modified titanium dioxide structure belongs to an organic structure, which can give the modified titanium dioxide better flexibility and significantly improve the anti-cracking performance of the coating;

[0031] (3) The modified titanium dioxide structure also contains silicon-oxygen structure, which can further improve the compatibility between the modified titanium dioxide and the silicone resin matrix, and is very beneficial to improving the wear resistance, water resistance, and crack resistance of the coating. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the following examples. However, it should be understood that the following examples are merely illustrative of the embodiments of the present invention and are not intended to limit the scope of the present invention.

[0033] The modified titanium dioxide in the following embodiments of the present invention is prepared as follows:

[0034] (1) 1 g of silane-modified polyether resin (AGC silane-modified polyether resin, model EXCESTAR S2420E, purchased from Asahi Glass Co., Ltd., Japan) was added to 100 mL of ethanol-water solution (the mass ratio of ethanol to water was 4:1), and stirred and hydrolyzed at 60 °C for 2 h to obtain a hydrolyzate;

[0035] (2) Add 2 g of titanium dioxide to 100 mL of ethanol-water solution, wherein the volume ratio of ethanol to water is 9:1, and stir at room temperature for 20 min to obtain a titanium dioxide dispersion;

[0036] (3) The hydrolyzate obtained in step (1) and the titanium dioxide dispersion obtained in step (2) were mixed evenly, and stirred at room temperature for 2 h. Thereafter, the reaction product was placed in an oven and dried at 70° C. for 12 h to obtain modified titanium dioxide.

[0037] The heavy calcium powder used in the following examples of the present invention has an average particle size of 1250 mesh and is purchased from Zhejiang Qunfeng Calcium Industry Co., Ltd.

[0038] The kaolin used in the following examples of the present invention has an average particle size of 1250 mesh and is purchased from Shijiazhuang Defa Chemical Technology Co., Ltd.

[0039] The silica fume powder used in the following examples of the present invention has an average particle size of 1250 meshes and is purchased from Erping Mineral Products Processing Plant in Lingshou County.

[0040] The bentonite used in the following examples of the present invention is calcium-based bentonite with an average particle size of 1000 mesh, purchased from Erping Mineral Products Processing Plant in Lingshou County.

[0041] The antibacterial agent used in the following examples of the present invention is antifungal agent KS-350.

[0042] Example 1

[0043] A water-based silicone resin coating, comprising the following components in parts by weight:

[0044] 300 parts of water-based silicone resin;

[0045] 150 parts of modified titanium dioxide;

[0046] 50 parts of heavy calcium powder;

[0047] 20 parts of kaolin;

[0048] 60 parts of silica fume;

[0049] 1 part of hydroxyethyl cellulose;

[0050] 1 part bentonite;

[0051] 1 copy of Japan San Nopco NXZ;

[0052] 4 parts of BXZ-210 ammonium salt dispersant;

[0053] 1 part of environmentally friendly wetting agent HY-352;

[0054] 1 part fungicide;

[0055] 150 parts water.

[0056] Example 2

[0057] A water-based silicone resin coating, comprising the following components in parts by weight:

[0058] 320 parts of water-based silicone resin;

[0059] 180 parts of modified titanium dioxide;

[0060] 70 parts of heavy calcium powder;

[0061] 40 parts of kaolin;

[0062] 70 parts of silica fume;

[0063] 3 parts of hydroxyethyl cellulose;

[0064] 1.5 parts of bentonite;

[0065] Defoamer G-NXZ 1 part;

[0066] 5 parts of 8527 ammonium salt dispersant;

[0067] 2 parts of environmentally friendly wetting agent PD-405;

[0068] 1.5 parts of fungicide

[0069] 180 parts water.

[0070] Example 3

[0071] A water-based silicone resin coating, comprising the following components in parts by weight:

[0072] 350 parts of water-based silicone resin;

[0073] 200 parts of modified titanium dioxide;

[0074] 100 parts of heavy calcium powder;

[0075] 50 parts of kaolin;

[0076] 75 parts of silica fume;

[0077] 5 parts of hydroxyethyl cellulose;

[0078] 2 parts bentonite;

[0079] Defoamer G-NXZ 2 parts;

[0080] 7 parts of HTK-5057 ammonium salt dispersant;

[0081] 3 parts of environmentally friendly wetting agent EW-100;

[0082] 2 parts fungicide

[0083] 200 parts water.

[0084] Comparative Example 1 is the same as Example 1, except that unmodified titanium dioxide is used in place of the modified titanium dioxide in Example 1.

[0085] Performance Testing

[0086] The water-based silicone resin coatings obtained in Examples 1-3 of the present invention and Comparative Example 1 were respectively applied to the surface of the exterior wall putty layer and cured at room temperature to obtain an inorganic coating with a thickness of 3 mm. Specific test results are shown in Table 1.

[0087] Artificial aging resistance test: The test standard is in accordance with GB / T9755-2014.

[0088] Washability: The test standard is in accordance with GB / T9756-2018.

[0089]

[0090] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A water-based silicone resin coating, characterized in that: Calculated by weight, it includes the following ingredients: 300-350 parts of water-based silicone resin; 150-200 parts of modified titanium dioxide; 50-100 parts of heavy calcium powder; 20-50 parts of kaolin; 60-75 parts of silica fume; 1-5 parts of hydroxyethyl cellulose; 1-2 parts of bentonite; 1-2 parts of defoaming agent; 4-7 parts of ammonium salt dispersant; 1-3 parts of environmentally friendly wetting agent; 1-2 parts of fungicide; 150-200 parts water; The preparation method of the modified titanium dioxide comprises the following steps: (1) Add 1 g of silane-modified polyether resin to 100 mL of ethanol-water solution (the mass ratio of ethanol to water is 4:1), stir and hydrolyze at 60 °C for 2 h to obtain a hydrolyzate; The model of the silane-modified polyether resin is EXCESTAR S2420E; (2) Add 2 g of titanium dioxide to 100 mL of ethanol-water solution (the volume ratio of ethanol to water is 9:1), and stir at room temperature for 20-30 minutes to obtain a titanium dioxide dispersion; (3) The hydrolyzate obtained in step (1) and the titanium dioxide dispersion obtained in step (2) were mixed evenly, and stirred at room temperature for 2 h. Thereafter, the reaction product was placed in an oven and dried at 70° C. for 12 h to obtain modified titanium dioxide.

2. A water-based silicone resin coating according to claim 1, characterized in that: The average particle size of the heavy calcium powder is 800-1250 meshes.

3. A water-based silicone resin coating according to claim 1, characterized in that: The average particle size of the kaolin is 800-1000 meshes.

4. The water-based silicone resin coating according to claim 1, characterized in that: The average particle size of the silica fume powder is 800-1250 meshes.

5. The water-based silicone resin coating according to claim 1, characterized in that: The bentonite includes at least one of sodium-based bentonite and calcium-based bentonite.

6. The water-based silicone resin coating according to claim 1, characterized in that: The defoaming agent is a metal soap defoaming agent.

7. The water-based silicone resin coating according to claim 1, characterized in that: The ammonium salt dispersant includes at least one of Mairui New Material 5027 dispersant, BXZ-210 ammonium salt dispersant, 8527 ammonium salt dispersant, and HTK-5057 ammonium salt dispersant.

8. The water-based silicone resin coating according to claim 1, characterized in that: The environmentally friendly wetting agent includes at least one of HY-352, PD-405, and EW-100.

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