Highly reflective thermal insulation coating and preparation method thereof

Abstract

The present invention provides a highly reflective thermal insulation coating comprising the following raw materials in parts by weight: 75-95 parts acrylic emulsion, 50-60 parts aqueous solvent, 10-15 parts hexacyclic stone, 5-10 parts infrared reflector, 30-50 parts filler, and 1-5 parts additive; the infrared reflector is selected from at least one of potassium hexatitanate whiskers, carbon black, and zirconium silicate. The coating produced from this highly reflective thermal insulation coating exhibits excellent reflective and thermal insulation properties, as well as good sterilization and purification effects.

Description

Technical Field

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

[0002] Since the 1970s, global warming and rising temperatures have made energy consumption a major challenge for the world. Consequently, the development of thermal insulation and energy-saving coatings that can produce a cooling effect on substrates exposed to sunlight has become a mainstream trend. Traditional thermal insulation coatings in my country have many drawbacks, especially those made with inorganic materials such as asbestos and perlite, and organic materials such as expanded polystyrene. These coatings suffer from poor cooling effects, poor thermal insulation performance, and poor antibacterial properties.

[0003] In order to overcome the above shortcomings, it is necessary to seek a coating so that the coating prepared therefrom has excellent thermal insulation performance and good bactericidal and antibacterial effects. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-reflective thermal insulation coating and a preparation method thereof. The coating prepared by the high-reflective thermal insulation coating has excellent reflective and thermal insulation effects and has good sterilization and purification effects.

[0005] According to one aspect of the present invention, a high-reflective thermal insulation coating is provided, comprising the following raw materials in parts by mass: 75-95 parts of acrylic emulsion, 50-60 parts of aqueous solvent, 10-15 parts of hexacyclic stone, 5-10 parts of infrared reflector, 30-50 parts of filler, and 1-5 parts of auxiliary agent. By introducing hexacyclic stone and infrared reflector into the high-reflective thermal insulation coating, the coating obtained by the coating can have an excellent reflective thermal insulation effect, thereby achieving the purpose of cooling. When the external environment temperature is high, objects in the external environment will radiate radiation energy, and the coating will convert it into heat energy after absorbing the radiation energy, thereby causing the temperature of the coating and the coating substrate to rise. After many experiments and tests by the inventors, it was found that the use of hexacyclic stone and infrared reflector can improve the thermal reflectivity of the coating and reduce the coating's absorption efficiency of thermal energy. Therefore, the coating obtained by the coating provided by the present invention has a high reflectivity to thermal radiation, so that when the coating receives radiation energy, it can radiate the absorbed energy to the outside as much as possible, thereby achieving the effect of reflecting heat and reducing the coating temperature. Secondly, Liuhuan Stone contains variable valence metal Fe, which easily undergoes redox reactions with water molecules in the environment to generate a large number of negative ions. The negative ions are used to destroy the protein structure of bacterial molecules, giving the coating a bactericidal and purifying effect.

[0006] Preferably, the infrared reflector is zirconium silicate, and the ratio of hexacyclic stone to zirconium silicate, calculated by mass, is 1.5 to 2:1. When the mass ratio of hexacyclic stone to zirconium silicate falls within the above range, a synergistic effect exists between the hexacyclic stone and the zirconium silicate, resulting in a coating with improved thermal insulation and reflection, thus cooling the building walls. Furthermore, when hexacyclic stone and zirconium silicate are combined to prepare a highly reflective thermal insulation coating, the resulting coating also exhibits excellent antibacterial and bactericidal properties, demonstrating a synergistic effect between the hexacyclic stone and the zirconium silicate, further enhancing the coating's antibacterial effect.

[0007] Preferably, the particle size of zirconium silicate is 100-300 μm. Experimental testing by the inventors revealed that larger zirconium silicate particles significantly improve the thermal insulation properties of highly reflective thermal insulation coatings. The coarser the zirconium silicate particle size used in preparing the coating, the greater the heat-reflecting ability of the corresponding coating. However, zirconium silicate with too coarse a particle size tends to aggregate and settle in the coating. Therefore, using zirconium silicate with a particle size of 100-300 μm can impart good storage stability to the coating and provide the coating with excellent reflective and thermal insulation properties.

[0008] Preferably, the particle size of the hexacyclic stone is 400-700 μm. When the hexacyclic stone meeting the aforementioned particle size range is used to prepare the coating, the resulting coating has a better bactericidal and antibacterial effect.

[0009] Preferably, the acrylic emulsion is cross-linked with a fluorocarbon monomer and an acrylic monomer, wherein the fluorocarbon monomer is selected from at least one of trifluoroethyl methacrylate and hexafluorobutyl methacrylate. By introducing the fluorocarbon monomer into the acrylic emulsion, the resulting coating exhibits excellent scrub resistance, making it difficult for dirt to settle on the coating surface. Furthermore, when combined with hexafluorosilane, the resulting coating exhibits excellent substrate adhesion and water resistance. Furthermore, when zirconium silicate is used as an infrared reflector, hydrogen bonding occurs between the acrylic emulsion and the hexafluorosilane and zirconium silicate, further improving the coating's weather resistance and strength, while also reducing the risk of cracking and decomposition in the wall coating.

[0010] Preferably, the acrylic emulsion is prepared by the following steps: uniformly mixing a fluorocarbon monomer, an acrylic monomer, an initiator, and an emulsifier, and reacting the resulting mixture at 70-90° C. for 1-3 hours to obtain the acrylic emulsion.

[0011] Preferably, the acrylic monomers are butyl acrylate and hydroxyethyl methacrylate, and the molar ratio of butyl acrylate: hydroxyethyl methacrylate: fluorocarbon monomer is 2-3:2-3:1. The inventors discovered through extensive experimentation and exploration that, during the preparation of the acrylic emulsion, adjusting the amounts of fluorocarbon monomer and acrylic monomer to achieve a molar ratio of butyl acrylate: hydroxyethyl methacrylate: fluorocarbon monomer of 2-3:2-3:1 improves the compatibility of the resulting acrylic emulsion with hexacyclic stone and infrared reflectors. This results in improved storage stability for high-reflective thermal insulation coatings using this acrylic emulsion, and the resulting coating exhibits improved substrate adhesion and scrub resistance.

[0012] Preferably, calculated according to the molar ratio, butyl acrylate: hydroxyethyl methacrylate: fluorocarbon monomer = 2:2:1.

[0013] Preferably, the additives include cellulose, bactericide, dispersant, film-forming aid, antifreeze agent, and defoaming agent.

[0014] According to another aspect of the present invention, a method for preparing the aforementioned highly reflective thermal insulation coating is provided, comprising the steps of: first, uniformly mixing a portion of an acrylic emulsion, a portion of an aqueous solvent, hexacyclic stone, an infrared reflector, and a portion of an additive, followed by adding the remaining raw materials to the reaction system and mixing them uniformly, thereby producing the highly reflective thermal insulation coating. The highly reflective thermal insulation coating provided by the present invention has a simple preparation process, is easy to operate, operates under mild conditions, and has good economic benefits. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0016] Example 1

[0017] This embodiment provides a highly reflective thermal insulation coating comprising the following raw materials by weight: 85 parts acrylic emulsion, 55 parts aqueous solvent, 12 parts hexacyclic stone, 6 parts infrared reflector, 40 parts filler, and 4.5 parts additives. Zirconium silicate with a particle size of 100-300 μm is used as the infrared reflector, and hexacyclic stone with a particle size of 400-700 μm is used. Additives include cellulose, a fungicide, a dispersant, a film-forming aid, an antifreeze agent, and a defoaming agent. The dosage of each additive in this embodiment can be adjusted based on actual conditions.

[0018] The acrylic emulsion is obtained by crosslinking a fluorocarbon monomer with an acrylic monomer. The fluorocarbon monomer is trifluoroethyl methacrylate, and the acrylic monomers are butyl acrylate and hydroxyethyl methacrylate. The molar ratio of the raw materials is butyl acrylate: hydroxyethyl methacrylate: fluorocarbon monomer = 2:2:1. The acrylic emulsion is prepared by uniformly mixing the fluorocarbon monomer and acrylic monomer with an initiator and an emulsifier, and reacting the resulting mixture at 80°C for 2 hours to produce the acrylic emulsion.

[0019] The preparation method of the high-reflective thermal insulation coating comprises the following steps: firstly, uniformly mixing 60 parts of acrylic emulsion, 15 parts of aqueous solvent, hexacyclic stone, infrared reflector, cellulose, bactericide and dispersant in sequence, then adding the remaining raw materials into the reaction system and uniformly mixing to obtain the high-reflective thermal insulation coating.

[0020] Example 2

[0021] This example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This example differs from Example 1 in that 12 parts hexacyclic stone and 5 parts zirconium silicate are used in the preparation of the highly reflective thermal insulation coating, with a mass ratio of hexacyclic stone to zirconium silicate of 2.4:1. The remaining raw material ratios and preparation method remain strictly consistent with those in Example 1.

[0022] Example 3

[0023] This example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This example differs from Example 1 in that 12 parts hexacyclic stone and 8 parts zirconium silicate are used in the preparation of the highly reflective thermal insulation coating, with a mass ratio of hexacyclic stone to zirconium silicate of 1.5:1. The remaining raw material ratios and preparation method remain strictly consistent with those in Example 1.

[0024] Example 4

[0025] This example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This example differs from Example 1 in that 12 parts hexacyclic stone and 10 parts zirconium silicate are used in the preparation of the highly reflective thermal insulation coating, with a mass ratio of hexacyclic stone to zirconium silicate of 1.2:1. The remaining raw material ratios and preparation method remain strictly consistent with those in Example 1.

[0026] Example 5

[0027] This example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This example differs from Example 1 in that an equal mass of potassium hexatitanate whiskers is used as the infrared reflector instead of the zirconium silicate in Example 1. The remaining raw material ratios and preparation method remain strictly consistent with those in Example 1.

[0028] Example 6

[0029] This example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This example differs from Example 1 in that zirconium silicate with a particle size of 20 to 100 μm is used as an infrared reflector. The remaining raw material ratios and preparation method remain identical to those in Example 1.

[0030] Example 7

[0031] This example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This example differs from Example 1 in that zirconium silicate with a particle size of 300-600 μm is used as an infrared reflector. The remaining raw material ratios and preparation method remain identical to those in Example 1.

[0032] Example 8

[0033] This example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This example differs from Example 1 in that an equal mass of commercially available pure acrylic emulsion is used in place of the acrylic emulsion in Example 1. The remaining raw material ratios and preparation method remain strictly consistent with those in Example 1.

[0034] Example 9

[0035] This example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This example differs from Example 1 in that, during the preparation of the acrylic emulsion, an equal amount of hexafluorobutyl methacrylate is used instead of the trifluoroethyl methacrylate in Example 1 as the fluorocarbon monomer. The remaining raw material ratios and preparation method remain strictly consistent with those in Example 1.

[0036] Example 10

[0037] This example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This example differs from Example 1 in that, during the preparation of the acrylic emulsion, the amounts of acrylic acid monomer and fluorocarbon monomer were varied to achieve a molar ratio of butyl acrylate:hydroxyethyl methacrylate:fluorocarbon monomer of 3:3:1. The remaining raw material ratios and preparation method remained identical to those in Example 1.

[0038] Example 11

[0039] This embodiment provides a highly reflective thermal insulation coating comprising the following raw materials by weight: 75 parts acrylic emulsion, 50 parts aqueous solvent, 10 parts hexacyclic stone, 5 parts infrared reflector, 30 parts filler, and 3 parts additives. Zirconium silicate with a particle size range of 100-300 μm is used as the infrared reflector, and hexacyclic stone with a particle size range of 400-700 μm is used. Additives include cellulose, a fungicide, a dispersant, a film-forming aid, an antifreeze agent, and a defoaming agent. The dosage of each additive in this embodiment can be adjusted based on actual conditions.

[0040] The acrylic emulsion is obtained by crosslinking a fluorocarbon monomer with an acrylic monomer. The fluorocarbon monomer is trifluoroethyl methacrylate, and the acrylic monomers are butyl acrylate and hydroxyethyl methacrylate. The molar ratio of the raw materials is butyl acrylate: hydroxyethyl methacrylate: fluorocarbon monomer = 2:2:1. The acrylic emulsion is prepared by uniformly mixing the fluorocarbon monomer and acrylic monomer with an initiator and an emulsifier, and reacting the resulting mixture at 70°C for 3 hours to produce the acrylic emulsion.

[0041] The preparation method of the high-reflective thermal insulation coating comprises the following steps: firstly, 44 parts of acrylic emulsion, 13 parts of aqueous solvent, hexacyclic stone, infrared reflector, cellulose, bactericide and dispersant are uniformly mixed in sequence, and then the remaining raw materials are added to the reaction system and mixed uniformly to prepare the high-reflective thermal insulation coating.

[0042] Example 12

[0043] This embodiment provides a highly reflective thermal insulation coating comprising the following raw materials by weight: 95 parts acrylic emulsion, 60 parts aqueous solvent, 15 parts hexacyclic stone, 7.5 parts infrared reflector, 50 parts filler, and 5 parts additives. Zirconium silicate with a particle size range of 100-300 μm is used as the infrared reflector, and hexacyclic stone with a particle size range of 400-700 μm is used. Additives include cellulose, a fungicide, a dispersant, a film-forming aid, an antifreeze agent, and a defoaming agent. The dosage of each additive in this embodiment can be adjusted based on actual conditions.

[0044] The acrylic emulsion is obtained by crosslinking a fluorocarbon monomer with an acrylic monomer. The fluorocarbon monomer is trifluoroethyl methacrylate, and the acrylic monomers are butyl acrylate and hydroxyethyl methacrylate. The molar ratio of the raw materials is butyl acrylate: hydroxyethyl methacrylate: fluorocarbon monomer = 2:2:1. The acrylic emulsion is prepared by uniformly mixing the fluorocarbon monomer and acrylic monomer with an initiator and an emulsifier, and reacting the resulting mixture at 90°C for one hour to produce the acrylic emulsion.

[0045] The preparation method of the high-reflective thermal insulation coating comprises the following steps: firstly, 55 parts of acrylic emulsion, 17 parts of aqueous solvent, hexacyclic stone, infrared reflector, cellulose, bactericide and dispersant are uniformly mixed in sequence, and then the remaining raw materials are added to the reaction system and mixed uniformly to prepare the high-reflective thermal insulation coating.

[0046] Comparative Example 1

[0047] This comparative example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This comparative example differs from Example 1 in that an equal amount of infrared reflective agent, the hexacyclic stone, is used in place of the hexacyclic stone in Example 1 during the preparation of the highly reflective thermal insulation coating, effectively using only the infrared reflective agent, zirconium silicate. The remaining raw material ratios and preparation method remain identical to those in Example 1.

[0048] Comparative Example 2

[0049] This comparative example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This comparative example differs from Example 1 in that an equal mass of hexacyclic stone is used in place of the infrared reflective agent zirconium silicate in Example 1 during the preparation of the highly reflective thermal insulation coating, effectively using only hexacyclic stone. The remaining raw material ratios and preparation method remain identical to those in Example 1.

[0050] Comparative Example 3

[0051] This comparative example uses the preparation method provided in Example 1 to prepare a highly reflective thermal insulation coating. This comparative example differs from Example 1 in that an equal amount of composite titanium dioxide is used as the infrared reflector in place of the zirconium silicate in Example 1. The composite titanium dioxide is a mixture of rutile titanium dioxide and anatase titanium dioxide in a 1:1 ratio. The remaining raw material ratios and preparation method remain identical to those in Example 1.

[0052] Test Example 1

[0053] Test objects: Highly reflective thermal insulation coatings provided in Examples 1 to 12 and Comparative Examples 1 to 3.

[0054] Test items and test methods:

[0055] (1) Storage stability: Refer to GB / T 6753.3-1986 Test method for storage stability of paint. When obvious sedimentation of agglomerates (corresponding to sedimentation grade 8) is measured, record the time when the paint of the test object appears to agglomerate during storage.

[0056] (2) Scrub resistance: Refer to GB / T 9266-2009 Determination of Scrub Resistance of Architectural Paint Coatings to test the scrub resistance of the coatings prepared by the test objects.

[0057] (3) Antibacterial rate: The antibacterial rate test was conducted with reference to GB / T21866-2008 Determination of antibacterial properties and antibacterial effects of antibacterial coatings (paint films). The test bacteria was Staphylococcus aureus, and the stain resistance of the coatings prepared by the test subjects was tested.

[0058] (4) Adhesion to substrate: Refer to GB / T 9286-1998 Paint and varnish film cross-cut test to test the adhesion of the coating prepared by the test object to the substrate.

[0059] (5) Thermal insulation performance: The coating prepared by the test object was heated using a DB-XGW far-infrared graphite heating plate. The temperature of the heating plate was set at 200°C. A thermocouple was installed on the side coated with the coating, and the temperature of the coating was recorded using a data acquisition instrument after the temperature stabilized.

[0060] Test results: as shown in Table 1.

[0061] Table 1. Test properties of coatings of various test objects

[0062]

[0063] Result analysis:

[0064] From the test performance shown in Table 1, compared with the coatings provided in Comparative Examples 1 to 3, the coatings provided in Examples 1 to 12 have better comprehensive performance in terms of storage stability, scrub resistance, antibacterial performance, adhesion to substrates, and thermal insulation performance.

[0065] Comparing the performance parameters of Examples 1-12 with those of Comparative Examples 1-2 reveals that the coatings produced using infrared reflectors and hexacyclic stone in Examples 1-12 exhibit superior thermal insulation and antibacterial properties. The coatings provided in Comparative Examples 1-2 achieved a minimum temperature of no less than 110°C during thermal insulation testing, while the coatings provided in Examples 1-12 achieved a maximum temperature of less than 105°C, demonstrating that the coatings provided in Examples 1-12 exhibit superior thermal insulation.

[0066] Comparing the performance parameters corresponding to Examples 1-12 with those corresponding to Comparative Example 3 reveals that the coatings provided by Examples 1-12 exhibit superior overall performance. Specifically, considering the infrared reflector alone, the titanium dioxide used in Comparative Example 3 reflects infrared heat better than the infrared reflector used in Examples 1-12. However, when the infrared reflector is combined with hexacyclic stone to create a coating, the coatings provided by Examples 1-12 exhibit even better heat reflection and thermal insulation properties.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A highly reflective thermal insulation coating, characterized in that: The invention comprises the following raw materials in parts by weight: 75-95 parts of acrylic emulsion, 50-60 parts of aqueous solvent, 10-15 parts of hexacyclic stone, 5-10 parts of infrared reflector, 30-50 parts of filler, and 1-5 parts of auxiliary agent; the infrared reflector is zirconium silicate, and the ratio of hexacyclic stone to zirconium silicate is 1.5-2:1 according to the weight; The particle size of the zirconium silicate is 100-300 μm; The acrylic emulsion is obtained by cross-linking a fluorocarbon monomer and an acrylic acid monomer, wherein the fluorocarbon monomer is trifluoroethyl methacrylate.

2. The highly reflective thermal insulation coating according to claim 1, characterized in that: The particle size of the six-ring stone is 400-700 μm.

3. The highly reflective thermal insulation coating according to claim 1, wherein: The acrylic emulsion is prepared by the following steps: uniformly mixing the fluorocarbon monomer, the acrylic monomer, an initiator, and an emulsifier, and reacting the resulting mixture at 70-90° C. for 1-3 hours to obtain the acrylic emulsion.

4. The highly reflective thermal insulation coating according to claim 1, wherein: The acrylic monomers are butyl acrylate and hydroxyethyl methacrylate, and the molar ratio of the butyl acrylate: the hydroxyethyl methacrylate: the fluorocarbon monomer is 2-3:2-3:

1.

5. The highly reflective thermal insulation coating according to claim 4, characterized in that: Calculated by molar ratio, the butyl acrylate: the hydroxyethyl methacrylate: the fluorocarbon monomer is 2:2:

1.

6. The highly reflective thermal insulation coating according to claim 1, wherein: The auxiliary agents include cellulose, bactericide, dispersant, film-forming auxiliary agent, antifreeze agent and defoaming agent.

7. A method for preparing the highly reflective thermal insulation coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: First, part of the acrylic emulsion, part of the aqueous solvent, the hexacyclic stone, the infrared reflector, and part of the auxiliary agent are uniformly mixed in sequence, and then the remaining raw materials are added to the reaction system and mixed uniformly to prepare the high-reflective thermal insulation coating.

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