Thermal insulation waterproof coating and preparation method thereof

Abstract

This invention relates to the field of coatings, and more particularly to a heat-insulating, waterproof coating and its preparation method. Specifically, it comprises an acrylic copolymer emulsion, a wetting agent, a dispersant, a defoamer, a thickener, a film-forming agent, a filler, and water; wherein the filler consists of mica powder and modified hollow glass microspheres. When 800-mesh mica powder and modified hollow glass microspheres are used in combination in this invention, good mechanical properties and weather resistance are maintained while ensuring good solar reflectivity. Furthermore, the addition of mica powder and modified hollow glass microspheres further enhances the waterproof performance of the coating.

Description

Technical Field

[0001] This invention relates to the field of coatings, and more particularly to a heat-insulating, waterproof coating and its preparation method. Background Technology

[0002] Building energy consumption accounts for approximately 28% of total energy consumption, and this proportion continues to rise with the gradual improvement of residents' living standards. Architectural coatings, with their advantages such as cost-effectiveness, lightweight texture, and ease of application, are increasingly widely used in the construction industry. Thermally insulating architectural coatings can significantly reduce the surface temperature of buildings, effectively suppress fluctuations in surface temperature, and thus optimize the internal thermal environment of buildings. Therefore, conducting research on thermally insulating architectural coatings is of paramount importance for promoting energy conservation and emission reduction.

[0003] However, thermal insulation coatings also face many challenges in practical applications. First, their high price limits their potential for large-scale promotion and application. Second, current comparative studies on the effects of different types of thermal insulation fillers are not in-depth enough, and systematic evaluation is lacking. Furthermore, the durability and weather resistance of thermal insulation coatings during long-term use remain uncertain. These factors all constrain the further development and widespread application of thermal insulation coatings. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a heat-insulating, waterproof coating and its preparation method.

[0005] This invention is achieved through the following technical solution:

[0006] A heat-insulating and waterproof coating is composed of acrylic copolymer emulsion, wetting agent, dispersant, defoamer, thickener, film-forming agent, filler and water; wherein the filler is composed of mica powder and modified hollow glass microspheres.

[0007] Furthermore, the acrylic copolymer emulsion contains 38% by mass, 0.2% wetting agent, 0.2% dispersant, 0.4% defoamer, 0.2% thickener, and 0.7% film-forming agent.

[0008] Furthermore, the wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is a polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0009] Furthermore, the mica powder has a mass percentage of 2%.

[0010] Furthermore, the mica powder has a particle size of 800 mesh.

[0011] Furthermore, the modified hollow glass microspheres have a mass percentage of 5% to 10%.

[0012] Furthermore, the method for preparing the modified hollow glass microspheres is as follows:

[0013] Step S1: Take hollow glass microspheres and add them to NaOH aqueous solution. Heat to 85 degrees Celsius with stirring and maintain at 85 degrees Celsius for 2 hours. Then, wash the hollow glass microspheres with deionized water and dry for 24 hours.

[0014] Step S2: Disperse magnesium sulfate and Al2(SO4)3·18H2O in deionized water to obtain solution A; add NaOH and 3.5g sodium carbonate to 200mL of deionized water to obtain solution B;

[0015] Step S3: Add the hollow glass microspheres obtained in step S1 to deionized water, stir and heat to 75 degrees Celsius, while adding solution A and solution B dropwise. After the addition is complete, continue stirring for 2 hours. Then centrifuge, wash the precipitate with deionized water, and freeze-dry to obtain modified hollow glass microspheres.

[0016] Furthermore, the hollow glass microspheres have a particle size of 10-250 micrometers and a wall thickness of 1-2 micrometers.

[0017] This invention also provides a method for preparing a heat-insulating, waterproof coating, comprising the following steps:

[0018] Step S1: Add wetting agent and dispersant to water and stir for 20 minutes; then add defoamer, thickener and filler and stir for 10 minutes;

[0019] Step S2: Add film-forming agent to acrylate copolymer emulsion and stir for 10 min;

[0020] Step S3: Mix the products from steps S1 and S2 and stir for 10 minutes to obtain a heat-insulating and waterproof coating.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] When 800-mesh mica powder and modified hollow glass microspheres are used in combination in this invention, good mechanical properties and weather resistance are maintained while ensuring good solar reflectivity. Furthermore, the addition of mica powder and modified hollow glass microspheres further enhances the waterproof performance of the coating. The flake-like structure of the mica powder prevents moisture from penetrating along the microchannels of the coating; the surface modification of the hollow glass microspheres improves their compatibility with the emulsion, allowing for more uniform distribution within the coating and improving its density and waterproofness. The coating preparation method is simple; it can be used immediately after the raw materials are mixed evenly, requiring no complex equipment or processes during application. Moreover, the coating forms a film quickly and dries in a short time, improving application efficiency, shortening the construction cycle, and reducing construction costs. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, are not intended to limit the embodiments of the present invention.

[0024] Figure 1 This is a SEM image of the modified hollow glass microspheres. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0026] The hollow glass microspheres in this invention are purchased from commercially available products and are hollow spheres with a particle size of 10-250 micrometers and a wall thickness of 1-2 micrometers.

[0027] Example 1

[0028] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0029] Acrylic copolymer emulsion: 38%;

[0030] Wetting agent: 0.2%;

[0031] Dispersant: 0.2%;

[0032] Defoamer: 0.4%;

[0033] Thickener: 0.2%;

[0034] Film-forming agent: 0.7%;

[0035] Filler: 2% 800 mesh mica powder, 5% modified hollow glass microspheres;

[0036] The remainder is water.

[0037] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0038] A method for preparing a heat-insulating, waterproof coating is as follows:

[0039] Step S1: Add wetting agent and dispersant to water and stir for 20 minutes; then add defoamer, thickener and filler and stir for 10 minutes;

[0040] Step S2: Add film-forming agent to acrylate copolymer emulsion and stir for 10 min;

[0041] Step S3: Mix the products from steps S1 and S2 and stir for 10 minutes to obtain a heat-insulating and waterproof coating.

[0042] The preparation method of the modified hollow glass microspheres is as follows:

[0043] Step S1: Take 6g of hollow glass microspheres and add them to 150mL of 2% (wt) NaOH aqueous solution. Heat the solution to 85 degrees Celsius with stirring and maintain the temperature at 85 degrees Celsius for 2 hours. Then, wash the hollow glass microspheres with deionized water and dry them for 24 hours.

[0044] Step S2: Disperse 16.05g magnesium sulfate and 22g Al2(SO4)3·18H2O into 200mL deionized water to obtain solution A; add 16g NaOH and 3.5g sodium carbonate into 200mL deionized water to obtain solution B;

[0045] Step S3: Add 4g of the hollow glass microspheres obtained in Step S1 to 100mL of deionized water, stir and heat to 75°C, while simultaneously adding solutions A and B dropwise. After the addition is complete, continue stirring for 2 hours; then centrifuge, wash the precipitate with deionized water, and freeze-dry to obtain the modified hollow glass microspheres. Figure 1 This is a SEM image of the modified hollow glass microspheres.

[0046] Example 2

[0047] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0048] Acrylic copolymer emulsion: 38%;

[0049] Wetting agent: 0.2%;

[0050] Dispersant: 0.2%;

[0051] Defoamer: 0.4%;

[0052] Thickener: 0.2%;

[0053] Film-forming agent: 0.7%;

[0054] Filler: 2% 800-mesh mica powder, 6% modified hollow glass microspheres;

[0055] The remainder is water.

[0056] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0057] The preparation method of a heat-insulating, waterproof coating is the same as in Example 1.

[0058] The preparation method of the modified hollow glass microspheres is the same as in Example 1.

[0059] Example 3

[0060] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0061] Acrylic copolymer emulsion: 38%;

[0062] Wetting agent: 0.2%;

[0063] Dispersant: 0.2%;

[0064] Defoamer: 0.4%;

[0065] Thickener: 0.2%;

[0066] Film-forming agent: 0.7%;

[0067] Filler: 2% 800-mesh mica powder, 7% modified hollow glass microspheres;

[0068] The remainder is water.

[0069] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0070] The preparation method of a heat-insulating, waterproof coating is the same as in Example 1.

[0071] The preparation method of the modified hollow glass microspheres is the same as in Example 1.

[0072] Example 4

[0073] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0074] Acrylic copolymer emulsion: 38%;

[0075] Wetting agent: 0.2%;

[0076] Dispersant: 0.2%;

[0077] Defoamer: 0.4%;

[0078] Thickener: 0.2%;

[0079] Film-forming agent: 0.7%;

[0080] Filler: 2% 800-mesh mica powder, 8% modified hollow glass microspheres;

[0081] The remainder is water.

[0082] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0083] The preparation method of a heat-insulating, waterproof coating is the same as in Example 1.

[0084] The preparation method of the modified hollow glass microspheres is the same as in Example 1.

[0085] Example 5

[0086] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0087] Acrylic copolymer emulsion: 38%;

[0088] Wetting agent: 0.2%;

[0089] Dispersant: 0.2%;

[0090] Defoamer: 0.4%;

[0091] Thickener: 0.2%;

[0092] Film-forming agent: 0.7%;

[0093] Filler: 2% 800-mesh mica powder, 9% modified hollow glass microspheres;

[0094] The remainder is water.

[0095] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0096] The preparation method of a heat-insulating, waterproof coating is the same as in Example 1.

[0097] The preparation method of the modified hollow glass microspheres is the same as in Example 1.

[0098] Example 6

[0099] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0100] Acrylic copolymer emulsion: 38%;

[0101] Wetting agent: 0.2%;

[0102] Dispersant: 0.2%;

[0103] Defoamer: 0.4%;

[0104] Thickener: 0.2%;

[0105] Film-forming agent: 0.7%;

[0106] Filler: 2% 800-mesh mica powder, 10% modified hollow glass microspheres;

[0107] The remainder is water.

[0108] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0109] The preparation method of a heat-insulating, waterproof coating is the same as in Example 1.

[0110] The preparation method of the modified hollow glass microspheres is the same as in Example 1.

[0111] Example 7

[0112] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0113] Acrylic copolymer emulsion: 38%;

[0114] Wetting agent: 0.2%;

[0115] Dispersant: 0.2%;

[0116] Defoamer: 0.4%;

[0117] Thickener: 0.2%;

[0118] Film-forming agent: 0.7%;

[0119] Filler: 2% Mg-mica powder, 10% modified hollow glass microspheres;

[0120] The remainder is water.

[0121] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0122] A method for preparing a heat-insulating, waterproof coating is as follows:

[0123] Step S1: Add wetting agent and dispersant to water and stir for 20 minutes; then add defoamer, thickener and filler and stir for 10 minutes;

[0124] Step S2: Add film-forming agent to acrylate copolymer emulsion and stir for 10 min;

[0125] Step S3: Mix the products from steps S1 and S2 and stir for 10 minutes to obtain a heat-insulating and waterproof coating.

[0126] The preparation method of the modified hollow glass microspheres is the same as in Example 1.

[0127] The preparation method of Mg-mica powder is as follows:

[0128] Sericite powder (800 mesh) was repeatedly and thoroughly washed with deionized water to remove impurities, and then dried at 100°C for 24 hours. 2g of the pretreated mica powder was placed in a 250mL Erlenmeyer flask, and 200mL of MgCl2·6H2O (1mol / L) solution was added. The mixture was then shaken on a horizontal shaker at 250rpm for 24 hours. After 24 hours, the mixture was centrifuged, the supernatant was discarded, and the above steps of treatment with fresh MgCl2·6H2O (1mol / L) solution were repeated three times. The resulting Mg-mica was dried in a desiccator at 85°C for 24 hours, then repeatedly washed with distilled water, and finally dried in a desiccator at 85°C.

[0129] Comparative Example 1

[0130] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0131] Acrylic copolymer emulsion: 38%;

[0132] Wetting agent: 0.2%;

[0133] Dispersant: 0.2%;

[0134] Defoamer: 0.4%;

[0135] Thickener: 0.2%;

[0136] Film-forming agent: 0.7%;

[0137] Filler: 2% 800-mesh mica powder, 10% hollow glass microspheres;

[0138] The remainder is water.

[0139] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0140] The preparation method of a heat-insulating, waterproof coating is the same as in Example 1.

[0141] Comparative Example 2

[0142] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0143] Acrylic copolymer emulsion: 38%;

[0144] Wetting agent: 0.2%;

[0145] Dispersant: 0.2%;

[0146] Defoamer: 0.4%;

[0147] Thickener: 0.2%;

[0148] Film-forming agent: 0.7%;

[0149] Filler: 2% 400-mesh mica powder, 10% modified hollow glass microspheres;

[0150] The remainder is water.

[0151] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0152] The preparation method of a heat-insulating, waterproof coating is the same as in Example 1.

[0153] The preparation method of the modified hollow glass microspheres is the same as in Example 1.

[0154] Comparative Example 3

[0155] A heat-insulating and waterproof coating, comprising, by weight percentage:

[0156] Acrylic copolymer emulsion: 38%;

[0157] Wetting agent: 0.2%;

[0158] Dispersant: 0.2%;

[0159] Defoamer: 0.4%;

[0160] Thickener: 0.2%;

[0161] Film-forming agent: 0.7%;

[0162] Filler: 2% 1250 mesh mica powder, 10% modified hollow glass microspheres;

[0163] The remainder is water.

[0164] The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoamer is polyether defoamer; the thickener is hydroxyethyl cellulose; and the film-forming aid is dodecyl alcohol ester.

[0165] The preparation method of a heat-insulating, waterproof coating is the same as in Example 1.

[0166] The preparation method of the modified hollow glass microspheres is the same as in Example 1.

[0167] Test case

[0168] Tensile properties and impermeability were tested according to GB / T23445-2009; water resistance was tested according to GB / T1733; alkali resistance was tested according to GB / T9265; and washability was tested according to GB / T 9266. Solar reflectance was measured using a UV / Vis / IR spectrophotometer with an integrating sphere in the 0.4–0.72 µm wavelength range, and the results are shown in Table 1.

[0169] Table 1 Performance Tests

[0170] Solar reflectance Tensile strength (Mpa) Water impermeability Water resistance (96h) Alkali resistance (48h) Washing resistance (2000 times of washing) Example 1 0.814 2.1 Water impermeable No abnormality No abnormality Normal Example 2 0.826 2 Water impermeable No abnormality No abnormality Normal Example 3 0.834 1.9 Water impermeable No abnormality No abnormality Normal Example 4 0.846 1.9 Water impermeable No abnormality No abnormality Normal Example 5 0.852 1.8 Water impermeable No abnormality No abnormality Normal Example 6 0.867 1.8 Water impermeable No abnormality No abnormality Normal Example 7 0.872 2.4 Water impermeable No abnormality No abnormality Normal Comparative Example 1 0.858 1.2 Water impermeable No abnormality No abnormality Normal Comparative Example 2 0.847 1.6 Water impermeable No abnormality No abnormality Normal Comparative Example 3 0.849 1.5 Water impermeable No abnormality No abnormality Normal

[0171] As shown in Table 1, with the gradual increase of the modified hollow glass microsphere content in the coating, due to its spherical structure, the overall performance of the coating is affected as the amount added increases, and the tensile strength decreases. However, the modified hollow glass microspheres exhibit good tensile strength compared to the original hollow glass microspheres. Furthermore, the coating shows good results in water resistance, alkali resistance, and washability, demonstrating good durability.

[0172] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A thermal insulation waterproofing coating, characterized by, The coating composition comprises an acrylate copolymer emulsion, a wetting agent, a dispersant, a defoaming agent, a thickening agent, a film forming agent, a filler and water; wherein the filler is mica powder and modified hollow glass microbeads; The modified hollow glass microbeads are prepared by the following method: Step S1: hollow glass microbeads are added to an aqueous NaOH solution, heated to 85 degrees Celsius under stirring, and maintained at 85 degrees Celsius for 2 hours; Then, the hollow glass microbeads are washed with deionized water and dried for 24 hours; Step S2: magnesium sulfate and Al2(SO4)3·18H2O are dispersed in deionized water to obtain solution A; NaOH and 3.5g of sodium carbonate are added to 200mL of deionized water to obtain solution B; Step S3: the hollow glass microbeads obtained in step S1 are added to deionized water, stirred and heated to 75 degrees Celsius, while solution A and solution B are added dropwise, after the dropwise addition is completed, stirring is continued for 2 hours; then centrifuged, the precipitate is washed with deionized water, and the modified hollow glass microbeads are obtained after freeze-drying.

2. The thermal and waterproofing coating according to claim 1, wherein The mass percentage of the acrylate copolymer emulsion is 38%, the wetting agent is 0.2%, the dispersant is 0.2%, the defoaming agent is 0.4%, the thickening agent is 0.2%, and the film forming agent is 0.7%.

3. The thermal and waterproofing coating according to claim 2, wherein The wetting agent is an alkyl phenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoaming agent is a polyether defoaming agent; the thickening agent is hydroxyethyl cellulose; and the film forming agent is alcohol ester twelve.

4. The thermal, moisture-curing polyurethane-based coating according to claim 3, wherein The mass percentage of the mica powder is 2%.

5. The thermal, moisture-curing polyurethane-based coating according to claim 4, wherein the polyol component comprises a polyether polyol. The particle size of the mica powder is 800 mesh.

6. The thermal, moisture-curing polyurethane-based coating of claim 4, wherein The mass percentage of the modified hollow glass microbeads is 5% to 10%.

7. The thermal, moisture-curing polyurethane-based coating of claim 1, wherein The particle size of the hollow glass microbeads is 10 to 250 microns, and the wall thickness is 1 to 2 microns.

8. The method for preparing the heat-insulating, waterproof coating as described in any one of claims 1 to 7, characterized in that, The method comprises the following steps: Step S1: the wetting agent and the dispersant are added to water and stirred for 20 minutes; then the defoaming agent, the thickening agent and the filler are added and stirred for 10 minutes; Step S2: the film forming agent is added to the acrylate copolymer emulsion and stirred for 10 minutes; Step S3: the products of step S1 and step S2 are mixed and stirred for 10 minutes to obtain the heat insulation, waterproof and heat preservation coating.

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