Glass heat insulation coating and preparation method thereof

Abstract

The invention belongs to the technical field of heat insulation coatings, and discloses a glass heat insulation coating and a preparation method thereof. The glass heat insulation coating is prepared from the following raw material components in parts by weight: 5 to 30 parts of film-forming resin, 3 to 18 parts of alumina sol, 2 to 12 parts of cesium tungsten bronze powder, 0.5 to 5 parts of alginate, 0.1 to 1 part of graphene, 0.1 to 1 part of ultraviolet light absorber and 30 to 60 parts of deionized water. The cesium tungsten bronze powder, the alumina sol and the alginate are compounded for use, so that a film formed by the coating has high transparency and high heat insulation property, the hardness of the film can be improved, the adhesion firmness of the film and glass is improved, and the film has longer service life. The glass heat-insulating coating provided by the invention is environment-friendly and non-toxic, the preparation process is simple and easy to operate, industrial production is favorably realized, and market requirements can be better met.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal insulation coatings, and in particular relates to a thermal insulation coating for glass and a preparation method thereof. Background Art

[0002] Glass thermal insulation coatings are high-tech, energy-saving products leveraging the unique optical properties of nanomaterials. By forming a micron-scale functional coating on the glass surface, they selectively control the solar spectrum. Their core principle is to leverage the differential response of nanometal particles (such as indium tin oxide and antimony tin oxide) in the coating to different wavelengths of light: maintaining high transmittance in the visible light band (380-780nm) while effectively blocking infrared (780-2500nm) and ultraviolet (280-380nm) wavelengths. This selective light transmission allows indoor spaces to receive ample natural light while significantly reducing the effects of solar radiation. Glass thermal insulation coatings form a highly transmissive, hard film on the glass surface that blocks and reflects near-infrared heat from sunlight. Applications on building curtain walls and rooms with east-west exposure can reduce air conditioning loads. Applications on automotive window surfaces provide sun protection, cooling, improved fuel efficiency, and UV protection, while also providing energy savings and anti-aging properties.

[0003] Current glass thermal insulation coatings still have problems such as poor thermal insulation effect, low hardness and adhesion, which seriously affect the service life of the film layer. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the aforementioned prior art. To this end, the present invention provides a glass thermal insulation coating and a method for preparing the same. The glass thermal insulation coating provided by the present invention exhibits excellent selective light transmission properties, good thermal insulation performance, and strong hardness and adhesion.

[0005] The invention provides a glass heat-insulating coating.

[0006] Specifically, a glass thermal insulation coating comprises the following raw material components in parts by weight: 5-30 parts of film-forming resin, 3-18 parts of aluminum sol, 2-12 parts of cesium tungsten bronze powder, 0.5-5 parts of alginate, 0.1-1 part of graphene, 0.1-1 part of ultraviolet absorber and 30-60 parts of deionized water.

[0007] Preferably, the glass thermal insulation coating comprises the following raw material components in parts by weight: 8-20 parts of film-forming resin, 5-15 parts of aluminum sol, 2-10 parts of cesium tungsten bronze powder, 0.5-3 parts of alginate, 0.1-0.6 parts of graphene, 0.1-1 parts of ultraviolet absorber and 30-60 parts of deionized water.

[0008] Preferably, the particle size of the aluminum sol is 10-50 nm.

[0009] Preferably, the particle size of the cesium tungsten bronze powder is 10-100 nm; further preferably, the particle size of the cesium tungsten bronze powder is 10-50 nm.

[0010] Preferably, the film-forming resin is selected from at least one of polyvinyl alcohol, polyvinyl pyrrolidone, polyurethane resin, epoxy resin, polyester resin and acrylic resin.

[0011] Preferably, the ultraviolet absorber is selected from at least one of UV106, UV531, UVP-327, and UV-9.

[0012] Preferably, the glass thermal insulation coating further comprises the following raw material components in parts by weight: 1-5 parts of a dispersing aid, 0.5-2 parts of a leveling agent, 0.5-3 parts of a defoaming agent, and 0.5-2 parts of a thickener.

[0013] Preferably, the dispersing aid is selected from at least one of polyethylene glycol, sodium carboxylate, SN-6076, and OROTAN™ 731A.

[0014] Preferably, the leveling agent is selected from at least one of BYK-333, LAG-925, TF-P450, Hyperlev F81, and TAFIGEL-PUR80.

[0015] Preferably, the defoaming agent is selected from at least one of sodium citrate, polyoxyethylene oxypropylene glycerin, Hemmings W-0506, and Ashland 1311.

[0016] Preferably, the thickener is selected from at least one of hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, bentonite, and aluminum silicate.

[0017] The invention provides a method for preparing a glass heat-insulating coating.

[0018] Specifically, a method for preparing a glass thermal insulation coating comprises the following steps: S1. The film-forming resin, dispersant additive, cesium tungsten bronze powder, and graphene are mixed, and then zirconia beads are added and sanded, and the zirconia beads are removed to obtain a mixture; S2. Deionized water and aluminum sol are added to the mixture, stirred, and then a UV absorber, a leveling agent, a defoaming agent, alginate, and a thickener are added in sequence and stirred evenly to obtain a glass insulating coating.

[0019] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses a compound of cesium tungsten bronze powder, aluminum sol and alginate, so that the coating has high transparency and high heat insulation after film formation, and can also improve the hardness of the coating and the adhesion strength (adhesion) between the coating and the glass, so that the coating has a longer service life.

[0020] (2) In the glass thermal insulation coating provided by the present invention, alginate itself can form a gel film with elasticity and toughness. At the same time, the complexation reaction between alginate and aluminum sol can increase the viscosity of the coating, making the coating better able to form a film on the glass and improving its fastness. Graphene has high light transmittance, high material strength and good toughness. Introducing graphene into the coating and controlling the amount of graphene can enhance heat radiation and heat dissipation while improving the hardness and toughness of the coating.

[0021] (3) The glass thermal insulation coating provided by the present invention is environmentally friendly and non-toxic, has a simple preparation process, is easy to operate, is conducive to industrial production, and can better meet market demand. DETAILED DESCRIPTION

[0022] In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the following examples are given for illustration. It should be noted that the following examples do not limit the scope of protection claimed by the present invention.

[0023] Unless otherwise specified, the raw materials, reagents, or devices used in the following experimental examples and embodiments can be obtained from conventional commercial sources or by existing known methods.

[0024] Example 1 A glass heat-insulating coating comprises the following raw material components in parts by weight: 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder (particle size of 20 nm), 0.2 parts of graphene, 40 parts of deionized water, 5 parts of aluminum sol (particle size of 10 nm), 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 2 parts of sodium alginate and 0.5 parts of carboxymethyl cellulose.

[0025] A method for preparing a glass thermal insulation coating comprises the following steps: S1. In parts by weight, 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder, and 0.2 parts of graphene were placed in a sand mill, and equal parts by weight of zirconia beads were added. The mixture was sand milled for 30 minutes and separated by a sieve to remove the zirconia beads to obtain a mixture. S2. The mixture in step S1 was transferred into a reactor, and 40 parts of deionized water and 5 parts of aluminum sol were added, and stirred for 30 minutes. Then, 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 2 parts of sodium alginate, and 0.5 parts of carboxymethyl cellulose were added in sequence, and stirring was continued for 40 minutes to obtain a glass insulation coating.

[0026] Example 2 A glass heat-insulating coating comprises the following raw material components in parts by weight: 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder (particle size of 20 nm), 0.2 parts of graphene, 40 parts of deionized water, 12 parts of aluminum sol (particle size of 10 nm), 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 3 parts of sodium alginate and 0.5 parts of carboxymethyl cellulose.

[0027] A method for preparing a glass thermal insulation coating comprises the following steps: S1. In parts by weight, 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder with a particle size of 20 nm, and 0.2 parts of graphene were placed in a sand mill jar, and equal parts by weight of zirconia beads were added. The mixture was sand milled for 30 min and separated by a sieve to remove the zirconia beads to obtain a mixture. S2. The mixture described in step S1 was transferred into a reactor, and 40 parts of deionized water and 12 parts of aluminum sol with a particle size of 10 nm were added, and stirred for 30 minutes. Then, 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 3 parts of sodium alginate, and 0.5 parts of carboxymethyl cellulose were added in sequence, and stirring was continued for 40 minutes to obtain a glass insulation coating.

[0028] Example 3 A glass heat-insulating coating comprises the following raw material components in parts by weight: 10 parts of polyvinyl pyrrolidone, 3 parts of acrylic resin, 2 parts of SN-6076, 10 parts of cesium tungsten bronze powder (particle size of 30nm), 0.3 parts of graphene, 55 parts of deionized water, 8 parts of aluminum sol (particle size of 30nm), stirred for 30 minutes, and then 0.7 parts of UVP-327, 0.5 parts of BYK-333, 2 parts of sodium citrate, 1 part of sodium alginate and 2 parts of carboxyethyl cellulose were added in sequence.

[0029] A method for preparing a glass thermal insulation coating comprises the following steps: S1. In parts by weight, 10 parts of polyvinyl pyrrolidone, 3 parts of acrylic resin, 2 parts of SN-6076, 10 parts of cesium tungsten bronze powder with a particle size of 30 nm, and 0.3 parts of graphene were placed in a sand mill, and equal parts by weight of zirconia beads were added. The mixture was sand milled for 30 min and separated by a sieve to remove the zirconia beads to obtain a mixture. S2. The mixture described in step S1 was transferred into a reactor, and 55 parts of deionized water and 8 parts of aluminum sol with a particle size of 30 nm were added. The mixture was stirred for 30 minutes. Then, 0.7 parts of UVP-327, 0.5 parts of BYK-333, 2 parts of sodium citrate, 1 part of sodium alginate, and 2 parts of carboxyethyl cellulose were added in sequence. The mixture was stirred for 60 minutes to obtain a glass insulation coating.

[0030] Comparative Example 1 This comparative example provides a glass thermal insulation coating, which differs from Example 1 in that no sanding is performed. The specific preparation steps are as follows: S1. In parts by weight, 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder having a particle size of 20 nm, and 0.2 parts of graphene were placed in a reaction vessel and stirred for 30 min to obtain a mixture; S2. Add 40 parts of deionized water and 5 parts of aluminum sol with a particle size of 10 nm to the mixture in step S1, and stir for 30 minutes. Then, add 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 2 parts of sodium alginate, and 0.5 parts of carboxymethyl cellulose in this order, and continue stirring for 40 minutes to obtain a glass insulation coating.

[0031] Comparative Example 2 This comparative example provides a glass thermal insulation coating, which differs from Example 1 in that no aluminum sol is added. The specific preparation steps are as follows: S1. In parts by weight, 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder with a particle size of 20 nm, and 0.2 parts of graphene were placed in a sand mill jar, and equal parts by weight of zirconia beads were added. The mixture was sand milled for 30 min and separated by a sieve to remove the zirconia beads to obtain a mixture. S2. The mixture in step S1 was transferred into a reactor, 40 parts of deionized water were added, and the mixture was stirred for 30 minutes. Then, 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 2 parts of sodium alginate, and 0.5 parts of carboxymethyl cellulose were added in sequence, and stirring was continued for 40 minutes to obtain a glass insulation coating.

[0032] Comparative Example 3 This comparative example provides a glass thermal insulation coating, which differs from Example 1 in that graphene is not added. The specific preparation steps are as follows: S1. In parts by weight, 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder with a particle size of 20 nm were placed in a sand mill jar, and equal parts by weight of zirconia beads were added, sand milled for 30 min, and the zirconia beads were separated by a sieve to obtain a mixture; S2. The mixture in step S1 was transferred into a reactor, and 40 parts of deionized water and 5 parts of aluminum sol with a particle size of 10 nm were added. The mixture was stirred for 30 minutes. Then, 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 2 parts of sodium alginate, and 0.5 parts of carboxymethyl cellulose were added in sequence. The mixture was stirred for 40 minutes to obtain a glass insulation coating.

[0033] Comparative Example 4 This comparative example provides a glass heat-insulating coating, which differs from Example 1 in that gelatin is used instead of sodium alginate. The specific preparation steps are as follows: S1. In parts by weight, 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder with a particle size of 20 nm, and 0.2 parts of graphene were placed in a sand mill jar, and equal parts by weight of zirconia beads were added. The mixture was sand milled for 30 min and separated by a sieve to remove the zirconia beads to obtain a mixture. S2. The mixture described in step S1 was transferred into a reactor, and 40 parts of deionized water and 5 parts of aluminum sol with a particle size of 10 nm were added. The mixture was stirred for 30 minutes. Then, 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 2 parts of gelatin, and 0.5 parts of carboxymethyl cellulose were added in sequence. The mixture was stirred for 40 minutes to obtain a glass insulation coating.

[0034] Comparative Example 5 This comparative example provides a glass thermal insulation coating, which differs from Example 1 in that the amount of aluminum sol is increased. The specific preparation steps are as follows: S1. In parts by weight, 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder with a particle size of 20 nm, and 0.2 parts of graphene were placed in a sand mill jar, and equal parts by weight of zirconia beads were added. The mixture was sand milled for 30 min and separated by a sieve to remove the zirconia beads to obtain a mixture. S2. The mixture in step S1 was transferred into a reactor, and 40 parts of deionized water and 20 parts of aluminum sol with a particle size of 10 nm were added. The mixture was stirred for 30 minutes. Then, 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 2 parts of sodium alginate, and 0.5 parts of carboxymethyl cellulose were added in sequence. The mixture was stirred for 40 minutes to obtain a glass insulation coating.

[0035] Comparative Example 6 This comparative example provides a glass thermal insulation coating, which differs from Example 1 in that the amount of graphene is increased. The specific preparation steps are as follows: S1. In parts by weight, 15 parts of polyvinyl alcohol, 1 part of polyethylene glycol, 5 parts of cesium tungsten bronze powder with a particle size of 20 nm, and 2 parts of graphene were placed in a sand mill jar, and equal parts by weight of zirconia beads were added. The mixture was sand milled for 30 min and separated by a sieve to remove the zirconia beads to obtain a mixture. S2. The mixture in step S1 was transferred into a reactor, and 40 parts of deionized water and 5 parts of aluminum sol with a particle size of 10 nm were added. The mixture was stirred for 30 minutes. Then, 0.6 parts of UV106, 1 part of Hyperlev F81, 0.5 parts of polyoxyethylene oxypropylene glycerol, 2 parts of sodium alginate, and 0.5 parts of carboxymethyl cellulose were added in sequence. The mixture was stirred for 40 minutes to obtain a glass insulation coating.

[0036] The performance tests were performed on the glass thermal insulation coatings prepared in Examples 1-3 and Comparative Examples 1-6.

[0037] The visible light transmittance, ultraviolet transmittance, and infrared transmittance are tested using the NS11 transmittance meter. The test method is as follows: apply the glass insulation coating to be tested on a glass plate of the same specification. After drying to form an insulation film with a thickness of 4 threads, place the glass plate in the NS11 transmittance meter, turn on the instrument, and directly test to obtain the transmittance values.

[0038] The thermal insulation temperature difference is tested using the LS300 thermal insulation film temperature tester. The test method is as follows: apply the glass thermal insulation coating to be tested on the provided glass plate. After drying to form a thermal insulation film with a thickness of 4 threads, place the glass plate into the LS300 thermal insulation film temperature tester, turn on the infrared lamp, and test the temperature change under the glass plate covered with the thermal insulation film within 1 minute to obtain the thermal insulation temperature difference value.

[0039] Adhesion is tested according to the test method of GBT9286-2021.

[0040] Table 1 shows the performance test results of the glass thermal insulation coatings prepared in Examples 1-3 and Comparative Examples 1-6.

[0041] Table 1

[0042] As can be seen from Table 1, the various performance test results of the glass insulation coatings prepared in Examples 1-3 are excellent, with small insulation temperature difference, good insulation effect, high hardness, and strong adhesion. In Comparative Example 1, since the cesium tungsten bronze powder was not sand-milled and dispersed, the powder was partially agglomerated. The increased agglomeration significantly reduced the visible light transmittance of the coating film, affecting the appearance of use, and also affecting the hardness and adhesion of the coating. In Comparative Example 2, no aluminum sol was used, and the hardness and adhesion of the coating decreased significantly, indicating that aluminum sol can enhance the hardness of the coating. At the same time, the combined use of aluminum sol and sodium alginate can also increase the viscosity of the coating, making it more firmly adhered to the glass. The addition of aluminum sol also has a positive effect on reducing ultraviolet transmittance and infrared transmittance. In Comparative Example 2, no aluminum sol was added, and the thermal insulation effect of the coating was also significantly affected. In Comparative Example 3, no graphene was used, and the hardness of the coating decreased significantly, and the thermal insulation performance also decreased significantly. Comparative Example 4 replaces sodium alginate with gelatin. Although both can be used as adhesives and thickeners, sodium alginate's complexation with the aluminum sol in the formulation significantly enhances its thickening and adhesion, significantly improving the hardness and adhesion of the resulting coating. In Comparative Example 5, increasing the amount of aluminum sol significantly reduces the visible light transmittance of the coating, while also affecting the toughness of the film, increasing its brittleness, and significantly reducing its adhesion. In Comparative Example 6, increasing the amount of graphene significantly reduces the visible light transmittance of the coating, but has no significant effect on other indicators.

[0043] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A glass thermal insulation coating, characterized in that: According to parts by weight, the raw materials include the following components: 5-30 parts of film-forming resin, 3-18 parts of aluminum sol, 2-12 parts of cesium tungsten bronze powder, 0.5-5 parts of alginate, 0.1-1 part of graphene, 0.1-1 part of ultraviolet absorber and 30-60 parts of deionized water.

2. The glass thermal insulation coating according to claim 1, characterized in that: According to parts by weight, the raw materials include the following components: 8-20 parts of film-forming resin, 5-15 parts of aluminum sol, 2-10 parts of cesium tungsten bronze powder, 0.5-3 parts of alginate, 0.1-0.6 parts of graphene, 0.1-1 parts of ultraviolet absorber and 30-60 parts of deionized water.

3. The glass thermal insulation coating according to claim 1 or 2, characterized in that: The particle size of the aluminum sol is 10-50 nm.

4. The glass thermal insulation coating according to claim 1 or 2, characterized in that: The particle size of the cesium tungsten bronze powder is 10-100 nm.

5. The glass thermal insulation coating according to claim 1 or 2, characterized in that: The film-forming resin is selected from at least one of polyvinyl alcohol, polyvinyl pyrrolidone, polyurethane resin, epoxy resin, polyester resin and acrylic resin.

6. The glass thermal insulation coating according to claim 1 or 2, characterized in that: The glass heat-insulating coating further comprises the following raw material components in parts by weight: 1-5 parts of a dispersing aid, 0.5-2 parts of a leveling agent, 0.5-3 parts of a defoaming agent, and 0.5-2 parts of a thickener.

7. The glass heat-insulating coating according to claim 6, characterized in that: The dispersing aid is selected from at least one of polyethylene glycol, sodium carboxylate, SN-6076, and OROTAN™ 731A.

8. The glass heat-insulating coating according to claim 6, characterized in that: The defoaming agent is selected from at least one of sodium citrate, polyoxyethylene oxypropylene glycerin, Hemmings W-0506, and Ashland 1311.

9. The glass thermal insulation coating according to claim 6, characterized in that: The thickener is selected from at least one of hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, bentonite, and aluminum silicate.

10. The method for preparing the glass thermal insulation coating according to any one of claims 6 to 9, characterized in that: The following steps are involved: S1. The film-forming resin, dispersant additive, cesium tungsten bronze powder, and graphene are mixed, and then zirconia beads are added and sanded, and the zirconia beads are removed to obtain a mixture; S2. Deionized water and aluminum sol are added to the mixture, stirred, and then a UV absorber, a leveling agent, a defoaming agent, alginate, and a thickener are added in sequence and stirred evenly to obtain a glass insulating coating.

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