Thermal insulation waterproof coating and preparation method thereof

Abstract

The invention relates to the field of coatings, in particular to a heat-insulation waterproof coating and a preparation method thereof. Specifically, the coating is prepared from acrylate copolymer emulsion, a wetting agent, a dispersing agent, a defoaming agent, a thickening agent, a film-forming agent, filler and water, wherein the filler is composed of mica powder and modified hollow glass beads. According to the invention, when the 800-mesh mica powder and the modified hollow glass beads are compounded for use, good mechanical properties and weather resistance are achieved while good solar reflectivity is maintained. Meanwhile, the mica powder and the modified hollow glass beads are added, so that the waterproof performance of the coating is further enhanced.

Description

Technical Field

[0001] The present invention relates to the field of coatings, and in particular to a heat-insulating, thermal-preserving and waterproof coating and a preparation method thereof. Background Art

[0002] Building energy consumption accounts for approximately 28% of total energy consumption, and this proportion continues to rise as residents' living standards gradually improve. Architectural coatings, thanks to their cost-effectiveness, lightweight construction, and ease of application, are increasingly being used in the construction sector. Thermal-insulating architectural coatings can significantly reduce building surface temperatures, effectively suppressing surface temperature fluctuations and optimizing the thermal environment within buildings. Therefore, research on thermal-insulating architectural coatings is crucial for promoting energy conservation and consumption reduction.

[0003] However, thermal insulation coatings face numerous challenges in practical application. First, their high price limits their widespread adoption and application. Second, comparative research on the effectiveness of different types of thermal insulation fillers is inadequate and lacks systematic evaluation. Furthermore, uncertainty remains regarding the durability and weather resistance of thermal insulation coatings over long-term use. These factors hinder their further development and widespread application. Summary of the Invention

[0004] The problems existing in the prior art have not been solved. The present invention provides a heat-insulating and waterproof coating and a preparation method thereof.

[0005] The present invention is achieved through the following technical solutions:

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

[0007] Furthermore, the mass percentage of the acrylic ester copolymer emulsion is 38%, the wetting agent is 0.2%, the dispersant is 0.2%, the defoaming agent is 0.4%, the thickener is 0.2%, and the film-forming agent is 0.7%.

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

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

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

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

[0012] Furthermore, the preparation method of the modified hollow glass microspheres is:

[0013] Step S1: hollow glass microspheres were added to a NaOH aqueous solution, heated to 85 degrees Celsius under stirring, and maintained at 85 degrees Celsius for 2 hours; then, the hollow glass microspheres were washed with deionized water and dried for 24 hours;

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

[0015] Step S3: The hollow glass microspheres obtained in step S1 were added to deionized water, stirred and heated to 75 degrees Celsius, and solution A and solution B were added dropwise at the same time. After the addition was completed, stirring was continued for 2 hours; then centrifuged, the precipitate was washed with deionized water, and freeze-dried to obtain modified hollow glass microspheres.

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

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

[0018] Step S1: adding a wetting agent and a dispersant to water and stirring for 20 minutes; then adding a defoamer, a thickener and a filler and stirring for 10 minutes;

[0019] Step S2: adding a film-forming agent to the acrylic copolymer emulsion and stirring for 10 minutes;

[0020] Step S3: Mix the products of step S1 and step 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 compounded and used in the present invention, good mechanical properties and weather resistance are simultaneously achieved while maintaining good solar reflectivity. Simultaneously, the addition of mica powder and modified hollow glass microspheres further enhances the waterproof properties of the coating. The flaky structure of the mica powder can prevent moisture from penetrating along the tiny channels of the coating; the surface modification of the modified hollow glass microspheres improves their compatibility with the emulsion, enabling them to be more evenly distributed in the coating, thereby improving the density and waterproof properties of the coating. The coating preparation method is simple, and the raw materials can be used after being evenly mixed, and no complicated equipment and processes are required during the construction process. Furthermore, the coating has a fast film-forming speed and a short drying time, which can improve construction efficiency, shorten the construction period, and reduce construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention.

[0024] Figure 1 This is the SEM image of the modified hollow glass microspheres. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0026] The hollow glass microspheres in the present invention are purchased from commercial products and are hollow spheres with a particle size of 10 to 250 microns and a wall thickness of 1 to 2 microns.

[0027] Example 1

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

[0029] Acrylate copolymer emulsion: 38%;

[0030] Wetting agent: 0.2%;

[0031] Dispersant: 0.2%;

[0032] Defoaming agent: 0.4%;

[0033] Thickener: 0.2%;

[0034] Film former: 0.7%;

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

[0036] The balance is water.

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

[0038] A preparation method of a heat-insulating and waterproof coating is as follows:

[0039] Step S1: adding a wetting agent and a dispersant to water and stirring for 20 minutes; then adding a defoamer, a thickener and a filler and stirring for 10 minutes;

[0040] Step S2: adding a film-forming agent to the acrylic copolymer emulsion and stirring for 10 minutes;

[0041] Step S3: Mix the products of step S1 and step 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: 6 g of hollow glass microspheres were added to 150 mL of a 2% (wt) NaOH aqueous solution, heated to 85°C with stirring, and maintained at 85°C for 2 h; then, the hollow glass microspheres were washed with deionized water and dried for 24 h;

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

[0045] Step S3: 4 g of the hollow glass microspheres obtained in step S1 were added to 100 mL of deionized water, stirred and heated to 75 degrees Celsius, and solution A and solution B were added dropwise at the same time. After the addition was completed, stirring was continued for 2 hours; then centrifuged, the precipitate was washed with deionized water, and freeze-dried to obtain modified hollow glass microspheres. Figure 1 This is the SEM image of the modified hollow glass microspheres.

[0046] Example 2

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

[0048] Acrylate copolymer emulsion: 38%;

[0049] Wetting agent: 0.2%;

[0050] Dispersant: 0.2%;

[0051] Defoaming agent: 0.4%;

[0052] Thickener: 0.2%;

[0053] Film former: 0.7%;

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

[0055] The balance is water.

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

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

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

[0059] Example 3

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

[0061] Acrylate copolymer emulsion: 38%;

[0062] Wetting agent: 0.2%;

[0063] Dispersant: 0.2%;

[0064] Defoaming agent: 0.4%;

[0065] Thickener: 0.2%;

[0066] Film former: 0.7%;

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

[0068] The balance is water.

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

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

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

[0072] Example 4

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

[0074] Acrylate copolymer emulsion: 38%;

[0075] Wetting agent: 0.2%;

[0076] Dispersant: 0.2%;

[0077] Defoaming agent: 0.4%;

[0078] Thickener: 0.2%;

[0079] Film former: 0.7%;

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

[0081] The balance is water.

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

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

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

[0085] Example 5

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

[0087] Acrylate copolymer emulsion: 38%;

[0088] Wetting agent: 0.2%;

[0089] Dispersant: 0.2%;

[0090] Defoaming agent: 0.4%;

[0091] Thickener: 0.2%;

[0092] Film former: 0.7%;

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

[0094] The balance is water.

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

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

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

[0098] Example 6

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

[0100] Acrylate copolymer emulsion: 38%;

[0101] Wetting agent: 0.2%;

[0102] Dispersant: 0.2%;

[0103] Defoaming agent: 0.4%;

[0104] Thickener: 0.2%;

[0105] Film former: 0.7%;

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

[0107] The balance is water.

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

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

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

[0111] Example 7

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

[0113] Acrylate copolymer emulsion: 38%;

[0114] Wetting agent: 0.2%;

[0115] Dispersant: 0.2%;

[0116] Defoaming agent: 0.4%;

[0117] Thickener: 0.2%;

[0118] Film former: 0.7%;

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

[0120] The balance is water.

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

[0122] A preparation method of a heat-insulating and waterproof coating is as follows:

[0123] Step S1: adding a wetting agent and a dispersant to water and stirring for 20 minutes; then adding a defoamer, a thickener and a filler and stirring for 10 minutes;

[0124] Step S2: adding a film-forming agent to the acrylic copolymer emulsion and stirring for 10 minutes;

[0125] Step S3: Mix the products of step S1 and step 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 that in Example 1.

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

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

[0131] Acrylate copolymer emulsion: 38%;

[0132] Wetting agent: 0.2%;

[0133] Dispersant: 0.2%;

[0134] Defoaming agent: 0.4%;

[0135] Thickener: 0.2%;

[0136] Film former: 0.7%;

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

[0138] The balance is water.

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

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

[0141] Comparative Example 2

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

[0143] Acrylate copolymer emulsion: 38%;

[0144] Wetting agent: 0.2%;

[0145] Dispersant: 0.2%;

[0146] Defoaming agent: 0.4%;

[0147] Thickener: 0.2%;

[0148] Film former: 0.7%;

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

[0150] The balance is water.

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

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

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

[0154] Comparative Example 3

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

[0156] Acrylate copolymer emulsion: 38%;

[0157] Wetting agent: 0.2%;

[0158] Dispersant: 0.2%;

[0159] Defoaming agent: 0.4%;

[0160] Thickener: 0.2%;

[0161] Film former: 0.7%;

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

[0163] The balance is water.

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

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

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

[0167] Test Case

[0168] Tensile properties and water 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 scrub resistance was tested according to GB / T 9266. Solar reflectance was measured in the 0.4-0.72µm band using a UV / Vis / Infrared spectrophotometer equipped with an integrating sphere. The results are shown in Table 1.

[0169] Table 1 Performance test

[0170] Solar reflectivity Tensile strength (Mpa) Impermeability Water resistance (96h) Alkali resistance (48h) Washability (wash 2000 times) Example 1 0.814 2.1 impermeable No abnormalities No abnormalities normal Example 2 0.826 2 impermeable No abnormalities No abnormalities normal Example 3 0.834 1.9 impermeable No abnormalities No abnormalities normal Example 4 0.846 1.9 impermeable No abnormalities No abnormalities normal Example 5 0.852 1.8 impermeable No abnormalities No abnormalities normal Example 6 0.867 1.8 impermeable No abnormalities No abnormalities normal Example 7 0.872 2.4 impermeable No abnormalities No abnormalities normal Comparative Example 1 0.858 1.2 impermeable No abnormalities No abnormalities normal Comparative Example 2 0.847 1.6 impermeable No abnormalities No abnormalities normal Comparative Example 3 0.849 1.5 impermeable No abnormalities No abnormalities normal

[0171] As can be seen in Table 1, as the content of modified hollow glass microspheres in the coating gradually increases, the overall performance of the coating is affected, and tensile strength decreases due to their spherical structure. However, the modified hollow glass microspheres exhibit better tensile strength than the original hollow glass microspheres. Furthermore, the coating exhibits excellent water resistance, alkali resistance, and scrub resistance, demonstrating good durability.

[0172] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method 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 in the scope of protection of the present invention.

Claims

1. A heat-insulating and waterproof coating, characterized in that: The invention is composed of acrylic copolymer emulsion, wetting agent, dispersant, defoaming agent, thickener, film-forming agent, filler and water; wherein the filler is composed of mica powder and modified hollow glass microspheres.

2. The heat-insulating and waterproof coating according to claim 1, characterized in that: The mass percentage of the acrylic ester copolymer emulsion is 38%, the wetting agent is 0.2%, the dispersant is 0.2%, the defoaming agent is 0.4%, the thickener is 0.2%, and the film-forming agent is 0.7%.

3. The heat-insulating and waterproof coating according to claim 2, characterized in that: The wetting agent is alkylphenol polyoxyethylene ether; the dispersant is sodium polyacrylate; the defoaming agent is polyether defoaming agent; the thickening agent is hydroxyethyl cellulose; and the film-forming auxiliary agent is alcohol ester dodecahydrate.

4. The heat-insulating and waterproof coating according to claim 3, characterized in that: The mass percentage of the mica powder is 2%.

5. The heat-insulating and waterproof coating according to claim 4, characterized in that: The particle size of the mica powder is 800 mesh.

6. The heat-insulating and waterproof coating according to claim 4, characterized in that: The mass percentage of the modified hollow glass microspheres is 5% to 10%.

7. The heat-insulating and waterproof coating according to claim 6, characterized in that: The preparation method of the modified hollow glass microspheres is as follows: Step S1: hollow glass microspheres were added to a NaOH aqueous solution, heated to 85°C under stirring, and maintained at 85°C for 2 h; Subsequently, the hollow glass microspheres were washed with deionized water and dried for 24 h; Step S2: dispersing magnesium sulfate and Al2(SO4)3·18H2O in deionized water to obtain solution A; adding NaOH and 3.5 g of sodium carbonate to 200 mL of deionized water to obtain solution B; Step S3: The hollow glass microspheres obtained in step S1 were added to deionized water, stirred and heated to 75 degrees Celsius, and solution A and solution B were added dropwise at the same time. After the addition was completed, stirring was continued for 2 hours; then centrifuged, the precipitate was washed with deionized water, and freeze-dried to obtain modified hollow glass microspheres.

8. The heat-insulating and waterproof coating according to claim 7, characterized in that: The hollow glass microspheres have a particle size of 10 to 250 microns and a wall thickness of 1 to 2 microns.

9. The method for preparing the heat-insulating and waterproof coating according to any one of claims 1 to 8, wherein: The following steps are involved: Step S1: adding a wetting agent and a dispersant to water and stirring for 20 minutes; then adding a defoamer, a thickener and a filler and stirring for 10 minutes; Step S2: adding a film-forming agent to the acrylic copolymer emulsion and stirring for 10 minutes; Step S3: Mix the products of step S1 and step S2, and stir for 10 minutes to obtain a heat-insulating and waterproof coating.

Images