Porous building radiation heat-insulation energy-saving coating and preparation method thereof

Abstract

The invention belongs to the technical field of building coatings, and particularly relates to a porous building radiation heat-insulation energy-saving coating and a preparation method thereof. The coating comprises the following components in percentage by weight: 10-20% of a first styrene dimethyl acrylate copolymer component; 5 to 15% of a second styrene methyl dimethacrylate copolymer component; 4-6% of microbeads; 10 to 15% of a silica aerogel; and 60-65% of a silicone acrylic emulsion. A coating layer formed by the coating provided by the invention has high sunlight reflectivity, atmospheric transmission window emissivity, low thermal conductivity and proper pores, and has good radiation heat-insulation and energy-saving effects.

Description

Technical Field

[0001] This invention belongs to the field of architectural coatings technology, specifically relating to a porous architectural radiation insulation and energy-saving coating and its preparation method. Background Technology

[0002] Radiative heat-insulating coatings can achieve energy savings. By incorporating radiative technology into the coating, heat from the object's surface can be transferred to outer space via radiative heat exchange through atmospheric windows, while heat absorption is reduced by enhancing the reflectivity of the solar spectrum. This achieves temperature reduction without consuming any energy and can be widely applied to building exteriors and other similar applications.

[0003] SMMA (Styrene-methyl dimethacrylate copolymer) has clear transparency and combines the properties of polystyrene (PS), polymethyl methacrylate (PMMA), and styrene-acrylonitrile copolymer (SAN), making it a potential candidate for application in the field of radiant heat insulation and energy-saving coatings. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a porous building radiation-insulating and energy-saving coating and its preparation method. The coating formed by the coating provided by this invention has high solar reflectivity, atmospheric transmission window emissivity, low thermal conductivity, and suitable porosity. It can reflect solar radiation and emit thermal radiation into outer space, and also has heat insulation capabilities, resulting in excellent radiation-insulating and energy-saving effects.

[0005] The technical solution provided by this invention is as follows: A porous building radiation insulation and energy-saving coating comprises the following components in weight percentages: 10-20% (preferably 10-15%, or 15-20%) of methyl methacrylate copolymer of styrene; 5-15% (preferably 5-10%, or 10-15%) of methyl methacrylate distyrene copolymer component; 4-6% microbeads; 10-15% silica aerogel; And 60-65% silicone-acrylic emulsion.

[0006] In the above technical solution: Styrene-dimethyl methacrylate copolymer can provide thermal radiation capability; Microspheres can provide thermal insulation; Silica aerogel not only provides thermal insulation, but also promotes the consistency of thermal radiation and insulation capabilities between the upper and lower surfaces of the coating, thereby improving the overall radiative thermal insulation and energy-saving capabilities of the coating.

[0007] Based on the above technical solution, the porous building radiation heat insulation and energy-saving coating forms a coating with high solar reflectivity, atmospheric transmission window emissivity, low thermal conductivity and suitable porosity, and can be used as a radiation heat insulation and energy-saving coating for buildings.

[0008] The SMMA polymer has a molecular weight of 12,000 and is available from Aladdin Reagents Company.

[0009] PMMA is available from Aladdin Reagents.

[0010] Specifically, the first styrene-dimethyl methacrylate copolymer component comprises the following components in parts by weight: 1 part of styrene-dimethyl methacrylate copolymer, 0.5-1 part of α-alumina, and 0.5-1 part of zinc oxide.

[0011] Specifically, the average particle size of the α-alumina powder is 200-500 nm.

[0012] Specifically, the second styrene-dimethyl methacrylate copolymer component comprises the following components in parts by weight: 1 part of styrene-dimethyl methacrylate copolymer, and 1-4 parts of polymethyl methacrylate.

[0013] Specifically: the microspheres are glass microspheres and / or hollow ceramic microspheres.

[0014] Specifically, the solid content of the silicone-acrylic emulsion is 50-55%.

[0015] The present invention also provides a method for preparing the above-mentioned porous building radiation heat insulation and energy-saving coating, comprising the following steps: mixing the first styrene dimethyl methacrylate copolymer component, the second styrene dimethyl methacrylate copolymer component, silica aerogel and silicone acrylic emulsion according to the amount in the formula, and then adding microbeads to obtain the coating.

[0016] Based on the above technical solution, styrene dimethacrylate copolymer is configured into the first component and the second component respectively, and mixed with the components respectively, which is beneficial to improve the performance of the coating.

[0017] Furthermore, 5-10% ethanol by weight of the first styrene-dimethyl methacrylate copolymer component, the second styrene-dimethyl methacrylate copolymer component, the silica aerogel, and the silicone-acrylic emulsion is also added.

[0018] Based on the above technical solution, it is beneficial to mix the various components to ensure the performance of porous building radiation insulation and energy-saving coatings.

[0019] The present invention also provides the application of porous building radiation insulation and energy-saving coatings for making exterior coatings for building walls or for making roof coatings.

[0020] The porous building radiation heat insulation and energy-saving coating provided by this invention has high solar reflectivity, atmospheric transmission window emissivity, low thermal conductivity and suitable porosity. When formed on the exterior wall or roof of a building, it can exert a good radiation heat insulation and energy-saving effect.

[0021] Specifically: After the porous building radiation heat insulation and energy-saving coating is applied to the exterior wall or roof, the volatile solvent is allowed to evaporate completely under outdoor temperature conditions, thus forming a porous building radiation heat insulation and energy-saving coating on the exterior wall or roof.

[0022] The beneficial effects of this invention are: 1) The porous building radiation heat insulation and energy-saving coating provided by this invention has good radiation heat insulation and energy-saving effect; 2) The porous building radiation insulation and energy-saving coating provided by this invention has low volatile components and is environmentally friendly. Detailed Implementation

[0023] The principles and features of the present invention are described below. The embodiments given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0024] Unless otherwise specified, the test methods used in the embodiments are conventional methods; unless otherwise specified, the materials and reagents used are commercially available.

[0025] Example 1 The preparation of porous building radiation insulation and energy-saving coatings includes the following steps: 1) Mix 1 part of styrene-dimethacrylate copolymer, 1 part of α-alumina and 0.5 parts of zinc oxide, and add 4% of ethanol to obtain the first component; 2) Mix 1 part of styrene-dimethyl methacrylate copolymer and 4 parts of polymethyl methacrylate, and add 4% of ethanol to obtain the second component; 3) According to the percentage of the total amount, 10% of the first component, 15% of the second component, 4% of the hollow ceramic microspheres, 11% of the silica aerogel and 60% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0026] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0027] Example 2 The preparation of porous building radiation insulation and energy-saving coatings includes the following steps: 1) Mix 1 part of styrene-dimethacrylate copolymer, 0.5 parts of α-alumina and 1 part of zinc oxide, and add 4% of ethanol to obtain the first component; 2) Mix 1 part of styrene-dimethyl methacrylate copolymer and 1 part of polymethyl methacrylate, and add 4% of ethanol to obtain the second component; 3) According to the percentage of the total amount, 20% of the first component, 9% of the second component, 1% of the hollow ceramic microspheres, 10% of the silica aerogel and 60% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0028] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0029] Example 3 The preparation of porous building radiation insulation and energy-saving coatings includes the following steps: 1) Mix 1 part of styrene-dimethacrylate copolymer, 0.8 parts of α-alumina and 0.8 parts of zinc oxide, and add 4% of ethanol to obtain the first component; 2) Mix 1 part of styrene-dimethyl methacrylate copolymer and 2 parts of polymethyl methacrylate, and add 4% of ethanol to obtain the second component; 3) According to the percentage of the total amount, 15% of the first component, 10% of the second component, 5% of the hollow ceramic microspheres, 10% of the silica aerogel and 60% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0030] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0031] Comparative Example 1 Referring to Example 3, the difference is that styrene-dimethyl methacrylate copolymer is not added in step 1). The preparation method of porous building radiation insulation and energy-saving coating specifically includes the following steps: 1) Mix 0.8 parts of α-alumina and 0.8 parts of zinc oxide, and add 4% of the total amount of ethanol to obtain the first component; 2) Mix 1 part of styrene-dimethyl methacrylate copolymer and 2 parts of polymethyl methacrylate, and add 4% of ethanol to obtain the second component; 3) According to the percentage of the total amount, 15% of the first component, 10% of the second component, 5% of the hollow ceramic microspheres, 10% of the silica aerogel and 60% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0032] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0033] Comparative Example 2 Referring to Example 3, the difference is that, in step 2), methyl methacrylate copolymer is not added. The preparation method of the porous building radiation insulation and energy-saving coating specifically includes the following steps: 1) Mix 1 part of styrene-dimethacrylate copolymer, 0.8 parts of α-alumina and 0.8 parts of zinc oxide, and add 4% of ethanol to obtain the first component; 2) Mix 2 parts of polymethyl methacrylate and add 4% of the total amount of ethanol to obtain the second component; 3) According to the percentage of the total amount, 15% of the first component, 10% of the second component, 5% of the hollow ceramic microspheres, 10% of the silica aerogel and 60% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0034] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0035] Comparative Example 3 Referring to Example 3, the difference is that styrene-dimethyl methacrylate copolymer is not added in steps 1) and 2). The preparation method of porous building radiation insulation and energy-saving coating specifically includes the following steps: 1) Mix 0.8 parts of α-alumina and 0.8 parts of zinc oxide, and add 4% of the total amount of ethanol to obtain the first component; 2) Mix 2 parts of polymethyl methacrylate and add 4% of the total amount of ethanol to obtain the second component; 3) According to the percentage of the total amount, 15% of the first component, 10% of the second component, 5% of the hollow ceramic microspheres, 10% of the silica aerogel and 60% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0036] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0037] Comparative Example 4 Referring to Example 3, the difference is that α-alumina is not added in step 1). The preparation method of the porous building radiation insulation and energy-saving coating specifically includes the following steps: 1) Mix 1 part of styrene-dimethyl methacrylate copolymer and 0.8 parts of zinc oxide, and add 4% of ethanol to obtain the first component; 2) Mix 1 part of styrene-dimethyl methacrylate copolymer and 2 parts of polymethyl methacrylate, and add 4% of ethanol to obtain the second component; 3) According to the percentage of the total amount, 15% of the first component, 10% of the second component, 5% of the hollow ceramic microspheres, 10% of the silica aerogel and 60% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0038] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0039] Comparative Example 5 Referring to Example 3, the difference is that zinc oxide is not added in step 1). The preparation method of the porous building radiation insulation and energy-saving coating specifically includes the following steps: 1) Mix 1 part of styrene-dimethyl methacrylate copolymer and 0.8 parts of α-alumina, and add 4% of ethanol to obtain the first component; 2) Mix 1 part of styrene-dimethyl methacrylate copolymer and 2 parts of polymethyl methacrylate, and add 4% of ethanol to obtain the second component; 3) According to the percentage of the total amount, 15% of the first component, 10% of the second component, 5% of the hollow ceramic microspheres, 10% of the silica aerogel and 60% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0040] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0041] Comparative Example 6 Referring to Example 3, the difference is that polymethyl methacrylate is not added in step 2). The preparation method of the porous building radiation insulation and energy-saving coating specifically includes the following steps: 1) Mix 1 part of styrene-dimethacrylate copolymer, 0.8 parts of α-alumina and 0.8 parts of zinc oxide, and add 4% of ethanol to obtain the first component; 2) Add 1 part of styrene-dimethyl methacrylate copolymer to 4% of the total ethanol to obtain the second component; 3) According to the percentage of the total amount, 15% of the first component, 10% of the second component, 5% of the hollow ceramic microspheres, 10% of the silica aerogel and 60% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0042] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0043] Comparative Example 7 Referring to Example 3, the difference is that hollow ceramic microspheres are not added in step 2). The preparation method of porous building radiation insulation and energy-saving coating specifically includes the following steps: 1) Mix 1 part of styrene-dimethacrylate copolymer, 0.8 parts of α-alumina and 0.8 parts of zinc oxide, and add 4% of ethanol to obtain the first component; 2) Mix 1 part of styrene-dimethyl methacrylate copolymer and 2 parts of polymethyl methacrylate, and add 4% of ethanol to obtain the second component; 3) According to the percentage of the total amount, 15% of the first component, 10% of the second component, 10% of the silica aerogel and 65% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0044] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0045] Comparative Example 8 Referring to Example 3, the difference is that in step 2), silica aerogel is not added. The preparation method of the porous building radiation insulation and energy-saving coating specifically includes the following steps: 1) Mix 1 part of styrene-dimethacrylate copolymer, 0.8 parts of α-alumina and 0.8 parts of zinc oxide, and add 4% of ethanol to obtain the first component; 2) Mix 1 part of styrene-dimethyl methacrylate copolymer and 2 parts of polymethyl methacrylate, and add 4% of ethanol to obtain the second component; 3) According to the percentage of the total amount, 15% of the first component, 10% of the second component, 5% of the hollow ceramic microspheres, and 70% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0046] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0047] Comparative Example 9 Referring to Example 3, the difference lies in that styrene-dimethyl methacrylate copolymer is added simultaneously in step 1). The preparation method of the porous building radiation insulation and energy-saving coating specifically includes the following steps: 1) Mix 2 parts of styrene-dimethyl methacrylate copolymer, 0.8 parts of α-alumina, 0.8 parts of zinc oxide, and 2 parts of polymethyl methacrylate, and add 8% of the total amount of ethanol to obtain the first component; 2) According to the percentage of the total amount, 25% of the second component, 5% of the hollow ceramic microspheres, and 70% of the silicone acrylic emulsion are uniformly mixed to obtain a porous building radiation insulation and energy-saving coating.

[0048] A coating of approximately 150 μm thickness was obtained by applying the coating, and various performance tests were conducted.

[0049] The test data for each embodiment and comparative example are as follows: As can be seen from the table above, Example 3 has high solar reflectivity, high atmospheric transmission window emissivity, and low thermal conductivity, and exhibits the lowest surface temperature, which is beneficial for energy saving.

[0050] Due to the absence of each component, the solar reflectivity, atmospheric transmission window emissivity, and thermal conductivity of Comparative Examples 1 to 8 were all reduced.

[0051] As can be seen from Comparative Example 9, adding styrene-dimethyl methacrylate copolymer to the first and second components and mixing them with the components respectively is beneficial to improving solar reflectivity, atmospheric transmission window emissivity, and reducing thermal conductivity.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A porous building radiation insulation and energy-saving coating, characterized in that, The components include the following weight percentages: 10-20% of methyl methacrylate copolymer component; 5-15% of methyl methacrylate distyrene copolymer component; 4-6% microbeads; 10-15% silica aerogel; And 60-65% silicone-acrylic emulsion.

2. The porous building radiation insulation and energy-saving coating according to claim 1, characterized in that, The first styrene-dimethyl methacrylate copolymer component comprises the following components in parts by weight: 1 part of styrene-dimethyl methacrylate copolymer, 0.5-1 part of α-alumina, and 0.5-1 part of zinc oxide.

3. The porous building radiation insulation and energy-saving coating according to claim 2, characterized in that: The average particle size of the α-alumina powder is 200-500 nm.

4. The porous building radiation insulation and energy-saving coating according to claim 1, characterized in that, The second styrene-dimethyl methacrylate copolymer component comprises the following components in parts by weight: 1 part of styrene-dimethyl methacrylate copolymer, and 1-4 parts of polymethyl methacrylate.

5. The porous building radiation insulation and energy-saving coating according to claim 1, characterized in that: The microspheres are glass microspheres and / or hollow ceramic microspheres.

6. The porous building radiation insulation and energy-saving coating according to claim 1, characterized in that: The solid content of the silicone-acrylic emulsion is 50-55%.

7. A method for preparing a porous building radiation insulation and energy-saving coating according to any one of claims 1 to 6, characterized in that, The process includes the following steps: mixing the first styrene-dimethyl methacrylate copolymer component, the second styrene-dimethyl methacrylate copolymer component, silica aerogel, and silicone-acrylic emulsion according to the amount specified in the formula, and then adding microbeads to obtain the final product.

8. The preparation method according to claim 7, characterized in that, The process includes the following steps: adding 5-10% ethanol by weight of the first styrene-dimethyl methacrylate copolymer component, the second styrene-dimethyl methacrylate copolymer component, the silica aerogel, and the silicone-acrylic emulsion.

9. The application of a porous building radiation insulation and energy-saving coating according to any one of claims 1 to 6, characterized in that: Used for making the exterior coating of building walls, or for making the surface coating of roofs.

10. The application according to claim 9, characterized in that: After the porous building radiation heat insulation and energy-saving coating is applied to the exterior wall or roof, the volatile solvent is allowed to evaporate completely under outdoor temperature conditions, thus forming a porous building radiation heat insulation and energy-saving coating on the exterior wall or roof.

Images