High-reflection multilayer heat insulation window film and preparation method thereof

Abstract

The invention relates to the technical field of window films, and particularly discloses a high-reflection multi-layer heat insulation window film and a preparation method thereof.The high-reflection multi-layer heat insulation window film comprises a scratch-resistant layer, a transparent film base material layer, a heat insulation layer, an ultraviolet blocking layer, a pressure-sensitive adhesive layer and a release film layer which are sequentially arranged from bottom to top; the thickness of the scratch-resistant layer is 6-14 [mu] m, the thickness of the transparent film base material layer is 80-100 [mu] m, the thickness of the heat-insulating layer is 20-40 [mu] m, the thickness of the ultraviolet blocking layer is 10-18 [mu] m, the thickness of the pressure-sensitive adhesive layer is 6-10 [mu] m, and the thickness of the release film layer is 10-30 [mu] m; by designing the raw material ratio and controlling the process parameters, the prepared high-reflection multi-layer heat insulation window film has the excellent performance of efficient heat insulation, scratch resistance, aging resistance and ultraviolet blocking.

Description

Technical Field

[0001] This application relates to the field of window film technology, and more specifically, to a high-reflectivity multilayer heat-insulating window film and its preparation method. Background Technology

[0002] Window film is a multi-layered, multi-functional, polyester composite optical-grade specialty film product. It is applied to glass surfaces to improve the glass's performance and strength, giving it functions such as heat insulation, energy saving, explosion protection, UV protection, privacy, and security. These characteristics make window film widely used in various industries. With social development and the increasing popularity of automobiles, the automotive industry has become a sunrise industry in industrial development, leading to a growing demand for automotive sun protection and heat insulation films, and simultaneously, increasingly higher performance requirements for these films.

[0003] Summer temperatures are high and solar radiation is strong. Ultraviolet (UV) rays in sunlight can cause melanin deposition in human skin, darkening its color. Excessive UV exposure can lead to health problems such as skin cancer. Car interiors also age faster under strong sunlight. Currently, most heat-insulating window films on the market suffer from poor UV and infrared blocking rates and inadequate mechanical properties, resulting in short lifespans. Furthermore, the metal oxide raw materials commonly used to improve heat insulation performance can shield signals. Therefore, this application proposes a high-reflectivity multilayer heat-insulating window film that can effectively block UV light and possesses excellent heat insulation and mechanical properties, along with its preparation method. Summary of the Invention

[0004] To address the issues of poor solar radiation blocking rate and unsatisfactory mechanical properties in related technologies, this application provides a high-reflectivity multilayer heat-insulating window film and its preparation method.

[0005] In a first aspect, this application provides a method for preparing a high-reflectivity multilayer heat-insulating window film, comprising the following steps: S1. Apply an anti-scratch coating liquid to one side of the transparent film substrate layer by roller coating, and then cure it by light after drying to obtain an anti-scratch layer. S2. Apply heat insulation coating material to the other side of the transparent film substrate layer by roller coating, and obtain the heat insulation layer after drying. S3. Apply a UV blocking layer coating material to the heat insulation layer by roller coating, and then cure it by light after drying to obtain the UV blocking layer. S4. Apply pressure-sensitive adhesive to the ultraviolet blocking layer by roller coating, and obtain the pressure-sensitive adhesive layer after drying. S5. Before winding, a release film layer is laminated onto the surface of the pressure-sensitive adhesive layer to obtain a high-reflectivity multilayer heat-insulating window film.

[0006] Preferably, the transparent film substrate layer is one of polyester film, polyethylene film, and polyimide film.

[0007] Preferably, in step S1, the anti-scratch coating liquid is prepared by the following method: 25-29 parts of polyurethane acrylate, 15-19 parts of bisphenol A epoxy diacrylate, 3-5 parts of photoinitiator, 44-56 parts of xylene, and 1-3 parts of organic modified polysiloxane are stirred and mixed to obtain the anti-scratch coating liquid.

[0008] Preferably, the photoinitiator is the photoinitiator ITX.

[0009] Preferably, in step S2, the heat-insulating coating material is prepared by the following method: (1) Mix 10-14 parts of quartz, 6-10 parts of mica, 10-30 parts of tetraethyl orthosilicate with 40-70 parts of ethanol solution, add 4-6 parts of dilute hydrochloric acid solution, stir and mix, let stand to form a wet gel, age the wet gel and dry to obtain silica aerogel. (2) Place the silica aerogel in a composite aldehyde solution, stir and mix, and dry to obtain modified silica aerogel; (3) Mix 10-30 parts of modified silica aerogel, 8-10 parts of phenyl polysiloxane resin and 26-30 parts of polyurethane resin, add 10-18 parts of curing agent, 6-10 parts of carrageenan and 2-4 parts of silicone oil, and stir to obtain heat insulation coating.

[0010] Preferably, in step (1), the mass concentration of the ethanol solution is 60%-80%, and the mass concentration of the dilute hydrochloric acid solution is 40%-60%.

[0011] Preferably, in step (2), the mass ratio of silica aerogel to composite aldehyde solution is 3-5:10.

[0012] Preferably, in step (2), the composite aldehyde solution is prepared by the following method: vanillin, myristaldehyde and perillaldehyde are mixed in a mass ratio of 3-5:2:1-3 to obtain a composite aldehyde, and ethylene glycol and composite aldehyde are added to ethylene glycol in a mass ratio of 50:5-9, and the mixture is stirred to obtain a composite aldehyde solution.

[0013] Preferably, the curing agent in step (3) is a polyamide curing agent.

[0014] Preferably, in step S3, the UV blocking layer coating material is prepared by the following method: 1) Mix 30-34 parts of sericite, 10-14 parts of dodecyltrimethylammonium bromide, 8-10 parts of succinic acid and 52-60 parts of water, disperse by ultrasonication, centrifuge, wash with deionized water, and then dry to obtain modified sericite. 2) Mix 18-22 parts of modified sericite, 8-10 parts of diatomaceous earth and 40-60 parts of anhydrous ethanol, add 80-100 parts of polymer solution, continue mixing and stirring, disperse by ultrasonication, wash with deionized water, and dry to obtain UV blocking material. 3) Add 40-60 parts of UV blocking material to 21-31 parts of UV curable coating, then add 5-7 parts of sodium dodecyl sulfate and 1-3 parts of vinyltriamine, stir evenly to obtain UV blocking coating material.

[0015] Preferably, the polymer solution in step 2) is prepared by the following method: mixing 10-18 parts of polyamide amine, 6-8 parts of polyvinyl alcohol and 30-50 parts of dimethylformamide to obtain a polymer solution.

[0016] Preferably, in step S4, the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive.

[0017] Preferably, in step S5, the release film layer is one of PET release film, PE release film, or BOPP release film.

[0018] Secondly, this application provides a high-reflectivity multilayer heat-insulating window film, which is prepared by the above method.

[0019] Preferably, the high-reflectivity multilayer heat-insulating window film includes, from bottom to top, an anti-scratch layer, a transparent film substrate layer, a heat-insulating layer, an ultraviolet blocking layer, a pressure-sensitive adhesive layer, and a release film layer.

[0020] Preferably, the total thickness of the high-reflectivity multilayer heat-insulating window film is 132-212μm, including a scratch-resistant layer of 6-14μm, a transparent film substrate layer of 80-100μm, a heat-insulating layer of 20-40μm, a UV-blocking layer of 10-18μm, a pressure-sensitive adhesive layer of 6-10μm, and a release film layer of 10-30μm.

[0021] In summary, this application has the following beneficial effects: 1. The high-reflectivity multilayer heat-insulating window film prepared in this application includes a scratch-resistant layer, a transparent film substrate layer, a heat-insulating layer, an ultraviolet blocking layer, a pressure-sensitive adhesive layer, and a release film layer. This application first laminates a scratch-resistant layer onto one side of the transparent film substrate layer, significantly enhancing the durability of the window film. Then, a heat-insulating layer is laminated onto the other side of the transparent film substrate layer, and an ultraviolet blocking layer is laminated onto the surface of the heat-insulating layer. The two layers work together to effectively block heat transfer and improve anti-aging properties, giving the prepared high-reflectivity multilayer heat-insulating window film excellent performance in terms of high-efficiency heat insulation, scratch resistance, aging resistance, and ultraviolet blocking.

[0022] 2. Silica aerogel possesses excellent thermal insulation properties, but its mechanical strength is low, making it prone to breakage. This application uses quartz, mica, and tetraethyl orthosilicate as silicon sources, providing diverse silicon structures that facilitate the formation of more complex silicon network structures and high-quality silica, thereby enhancing the mechanical properties of silica aerogel. Modifying silica aerogel with a composite aldehyde solution, vanillin and perillaldehyde can enhance the skeletal structure of silica aerogel, improving its toughness and thermal stability, while myristaldehyde can significantly reduce the water absorption and improve its hydrophobicity. The addition of composite aldehydes can further refine and homogenize the pore structure of silica aerogel, thus improving its thermal insulation performance. Further introduction of phenyl polysiloxane resin allows the hydrophobic groups of silica aerogel to react with the organosilicon groups of phenyl polysiloxane resin, forming a denser and more stable structure, thereby enhancing thermal insulation performance. Phenyl polysiloxane resin can also enhance the weather resistance and chemical corrosion resistance of silica aerogel. Meanwhile, compared with traditional metal oxides, silica aerogel does not block signals, enabling high-reflectivity multilayer heat-insulating window films to have both high heat insulation and good signal penetration.

[0023] 3. The layered structure of sericite gives it a high ability to block ultraviolet rays, while the microporous structure of diatomite can capture and absorb ultraviolet rays. This application first uses dodecyltrimethylammonium bromide to intercalate and modify sericite, thereby breaking the interlayer hydrogen bonds, increasing the interlayer distance, and enhancing the dispersibility and compatibility of sericite. The addition of succinic acid can enhance the interaction between dodecyltrimethylammonium bromide and sericite, and can also undergo an exchange reaction with the cations in the sericite interlayers, making the interlayer structure more loose and porous, which is conducive to the subsequent distribution of diatomaceous earth. Then, the modified sericite is compounded with diatomaceous earth. The composite structure formed by the two can not only significantly shield ultraviolet radiation, but also effectively absorb some ultraviolet rays that are not completely shielded. The two work synergistically to improve the ultraviolet resistance of the high-reflectivity multilayer heat-insulating window film. The composite structure formed by the modified sericite and diatomaceous earth is further organically coated with polymers, which can improve the stability and dispersibility of the composite structure, thereby significantly improving the ultraviolet resistance of the composite structure. Polyamide amine itself has a certain ultraviolet absorption and shielding ability, which can synergistically enhance the ultraviolet resistance with sericite and diatomaceous earth. In addition, sericite and diatomaceous earth have good heat insulation and weather resistance properties, which helps to extend the service life of high-reflectivity multilayer heat-insulating window film. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the product in this application.

[0025] The labels in the diagram represent: 1. Release film layer, 2. Pressure-sensitive adhesive layer, 3. Ultraviolet barrier layer, 4. Heat insulation layer, 5. Transparent film substrate layer, and 6. Scratch-resistant layer. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the embodiments.

[0027] The polyethylene film (item number: XR201803021027, purchased from Wuxi Xinrun Protective Film Co., Ltd.), polyurethane acrylate (model: YK2102, purchased from Yantai Houde Functional Polymer Materials Co., Ltd.), bisphenol A epoxy diacrylate (CAS: 55818-57-0, purchased from Guangzhou Shanghe Chemical Technology Co., Ltd.), organic modified polysiloxane (model: XH8260ZBTL09, purchased from Shenzhen Longdi Chemical Co., Ltd.), and quartz (particle size: 80μm, purchased from Lingshou Xumao Foundry Materials Co., Ltd.) used in this embodiment and comparative example are as follows: Mica (mesh: 400, purchased from Lingshou County Baofeng Mica Processing Co., Ltd.), tetraethyl orthosilicate (CAS: 78-10-4, purchased from Shandong Yuanjin New Materials Co., Ltd.), vanillin (content: 98%, purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.), myristal (CAS: 124-25-4, purchased from Wuhan Chengtian Fine Chemical Co., Ltd.), perillaldehyde (CAS: 18031-40-8, purchased from Jiangsu Runfeng Synthetic Technology Co., Ltd.), phenyl polysiloxane resin (brand name: SH-9601B, purchased from Shenzhen Jipeng Silicon Fluorine Materials Co., Ltd.) Polyurethane resin (product batch number: 46382, purchased from Guangzhou Ruilin New Materials Co., Ltd.), succinic acid (active ingredient content: 99%, purchased from Jinan Lebin Chemical Co., Ltd.), polyamide (active ingredient content: 99%, purchased from Guangdong Fangxin Biotechnology Co., Ltd.), polyvinyl alcohol (model: PVA95-88, purchased from Jining Fangyu Chemical Co., Ltd.), polyamide curing agent (brand: 9140, purchased from Guangdong Shuntian New Materials Co., Ltd.), carrageenan (CAS: 9000-07-1, purchased from Hubei Haijia Biotechnology Co., Ltd.), silicone oil (model: Items purchased: 201 (from Jinan Yingyu Chemical Co., Ltd.), sericite (specification: BT-4, from Chuzhou Baota Sericite Mining Co., Ltd.), diatomaceous earth (model: SD-602#, from Dongguan Senda Diatomaceous Earth Materials Co., Ltd.), UV-curable coating (active ingredient content: 90%, from Linyi Lanshan District Yonggao Surface Materials Co., Ltd.), acrylic pressure-sensitive adhesive (model: CF-60S, from Shandong Kafule Polymer Materials Co., Ltd. Jinan Branch), and PET release film (item number: zxc-21507, from Dongguan Xinlonghui Plastic Products Co., Ltd.). Example 1

[0028] A high-reflectivity multilayer heat-insulating window film with a total thickness of 147μm includes a 6μm scratch-resistant layer, an 80μm transparent film substrate layer, a 20μm heat-insulating layer, a 10μm ultraviolet blocking layer, a 6μm pressure-sensitive adhesive layer, and a 25μm release film layer.

[0029] A method for preparing a high-reflectivity multilayer heat-insulating window film includes the following steps: S1. Apply anti-scratch coating liquid to one side of a polyethylene film by concave roller coating, dry at 100°C for 2 minutes, and light-cur for 30 seconds to obtain an anti-scratch layer. S2. Apply heat insulation coating material to the other side of the polyethylene film by concave roller coating, and dry at 120°C for 2 minutes to obtain the heat insulation layer. S3. Apply UV barrier coating material to the heat insulation layer by roller coating, dry at 120℃ for 2 minutes, and light-cur for 30 seconds to obtain UV barrier layer. S4. Apply acrylic pressure-sensitive adhesive to the ultraviolet blocking layer by roller coating, and dry at 100°C for 2 minutes to obtain the pressure-sensitive adhesive layer. S5. Before winding, a PET release film is laminated onto the surface of the pressure-sensitive adhesive layer to obtain a high-reflectivity multilayer heat-insulating window film.

[0030] The anti-scratch coating liquid is prepared by the following method: 25 parts of polyurethane acrylate, 15 parts of bisphenol A epoxy diacrylate, 3 parts of photoinitiator ITX, 44 parts of xylene, and 1 part of organic modified polysiloxane are stirred at 600 r / min for 50 min to obtain the anti-scratch coating liquid.

[0031] The heat-insulating coating is prepared by the following method: (1) Mix 10 parts of quartz, 6 parts of mica, 10 parts of tetraethyl orthosilicate with 40 parts of ethanol solution with a mass concentration of 60%, add 4 parts of dilute hydrochloric acid solution with a mass concentration of 50%, stir at 600 r / min for 30 min, let stand for 1 h to form a wet gel, age the wet gel, control the aging temperature at 45℃ and the aging time at 8 h, and then dry at 90℃ for 3 h to obtain silica aerogel. (2) The silica aerogel and the composite aldehyde solution were mixed in a mass ratio of 3:10. The silica aerogel was placed in the composite aldehyde solution (the composite aldehyde was prepared by mixing vanillin, myristaldehyde and perillaldehyde in a mass ratio of 3:2:1, and the composite aldehyde was added to ethylene glycol in a mass ratio of 50:5. The mixture was stirred at 400 r / min for 40 min). The mixture was stirred at 800 r / min for 1 h and then dried at 100 °C for 5 h to obtain the modified silica aerogel. (3) Mix 10 parts of modified silica aerogel, 8 parts of phenyl polysiloxane resin and 26 parts of polyurethane resin, add 10 parts of polyamide curing agent, 6 parts of carrageenan and 2 parts of silicone oil, and stir at 600 r / min for 30 min to obtain heat insulation coating material.

[0032] The UV blocking layer coating material is prepared by the following method: 1) Mix 30 parts of sericite, 10 parts of dodecyltrimethylammonium bromide, 8 parts of succinic acid and 52 parts of water at 600 r / min for 20 min, ultrasonically disperse for 1 h, control the ultrasonic power at 600 W and the ultrasonic frequency at 20 kHz, centrifuge at 10000 r / min for 30 min, wash the centrifuged product with deionized water 3 times, and then dry at 60℃ for 1 h to obtain modified sericite; 2) 18 parts of modified sericite, 8 parts of diatomaceous earth and 40 parts of anhydrous ethanol were stirred and mixed at 600 r / min for 40 min. 80 parts of polymer solution (prepared by stirring and mixing 10 parts of polyamide amine, 6 parts of polyvinyl alcohol and 30 parts of dimethylformamide at 400 r / min for 30 min) were added and stirred and mixed at 800 r / min for 10 min. The mixture was then ultrasonically dispersed for 1 h, with the ultrasonic power controlled at 500 W and the ultrasonic frequency at 20 kHz. The mixture was washed twice with deionized water and dried at 50 °C for 1 h to obtain the ultraviolet blocking material. 3) Add 40 parts of UV blocking material to 21 parts of UV curing coating, then add 5 parts of sodium dodecyl sulfate and 1 part of vinyltriamine, and stir and mix at 800 r / min for 30 min to obtain UV blocking coating material. Example 2

[0033] A high-reflectivity multilayer heat-insulating window film with a total thickness of 167μm includes a scratch-resistant layer of 10μm, a transparent film substrate layer of 80μm, a heat-insulating layer of 30μm, an ultraviolet blocking layer of 14μm, a pressure-sensitive adhesive layer of 8μm, and a release film layer of 25μm.

[0034] A method for preparing a high-reflectivity multilayer heat-insulating window film includes the following steps: S1. Apply anti-scratch coating liquid to one side of a polyethylene film by roller coating, dry at 110°C for 3 min, and light-cur for 34 s to obtain an anti-scratch layer. S2. Apply heat insulation coating material to the other side of the polyethylene film by concave roller coating, and dry at 130°C for 3 minutes to obtain the heat insulation layer. S3. Apply UV barrier coating material to the heat insulation layer by roller coating, dry at 130℃ for 3 minutes, and light-cur for 34 seconds to obtain UV barrier layer. S4. Apply acrylic pressure-sensitive adhesive to the ultraviolet blocking layer by roller coating, and dry at 110°C for 3 minutes to obtain the pressure-sensitive adhesive layer. S5. Before winding, a PET release film is laminated onto the surface of the pressure-sensitive adhesive layer to obtain a high-reflectivity multilayer heat-insulating window film.

[0035] The anti-scratch coating liquid is prepared by the following method: 27 parts of polyurethane acrylate, 17 parts of bisphenol A epoxy diacrylate, 4 parts of photoinitiator ITX, 50 parts of xylene, and 2 parts of organic modified polysiloxane are stirred at 600 r / min for 50 min to obtain the anti-scratch coating liquid.

[0036] The heat-insulating coating is prepared by the following method: (1) Mix 12 parts of quartz, 8 parts of mica, 20 parts of tetraethyl orthosilicate with 55 parts of 70% ethanol solution, add 5 parts of 50% dilute hydrochloric acid solution, stir at 700 r / min for 40 min, let stand for 2 h to form wet gel, age the wet gel, control the aging temperature at 55℃ and the aging time at 9 h, and then dry at 100℃ for 5 h to obtain silica aerogel. (2) The silica aerogel and the composite aldehyde solution were mixed in a mass ratio of 4:10. The silica aerogel was placed in the composite aldehyde solution (the composite aldehyde was prepared by mixing vanillin, myristaldehyde and perillaldehyde in a mass ratio of 4:2:2, and the composite aldehyde was added to ethylene glycol in a mass ratio of 50:7. The mixture was stirred at 400 r / min for 40 min). The mixture was stirred at 800 r / min for 1 h and then dried at 100 °C for 5 h to obtain the modified silica aerogel. (3) Mix 20 parts of modified silica aerogel, 9 parts of phenyl polysiloxane resin and 28 parts of polyurethane resin, add 14 parts of polyamide curing agent, 8 parts of carrageenan and 3 parts of silicone oil, and stir at 700 r / min for 40 min to obtain heat insulation coating.

[0037] The UV blocking layer coating material is prepared by the following method: 1) Mix 32 parts of sericite, 12 parts of dodecyltrimethylammonium bromide, 9 parts of succinic acid and 56 parts of water at 600 r / min for 20 min, ultrasonically disperse for 2 h, control the ultrasonic power at 700 W and the ultrasonic frequency at 22 kHz, centrifuge at 10000 r / min for 30 min, wash the centrifuged product with deionized water 3 times, and then dry at 70℃ for 2 h to obtain modified sericite; 2) 20 parts of modified sericite, 9 parts of diatomaceous earth and 50 parts of anhydrous ethanol were stirred and mixed at 600 r / min for 40 min. 90 parts of polymer solution (prepared by stirring and mixing 14 parts of polyamide amine, 7 parts of polyvinyl alcohol and 40 parts of dimethylformamide at 400 r / min for 30 min) were added. The mixture was stirred and mixed at 800 r / min for 10 min, and then ultrasonically dispersed for 2 h. The ultrasonic power was controlled at 500 W and the ultrasonic frequency at 20 kHz. The mixture was washed twice with deionized water and dried at 55 °C for 1.5 h to obtain the ultraviolet blocking material. 3) Add 50 parts of UV blocking material to 26 parts of UV curable coating, then add 6 parts of sodium dodecyl sulfate and 2 parts of vinyltriamine, and stir and mix at 800 r / min for 30 min to obtain UV blocking coating material. Example 3

[0038] A high-reflectivity multilayer heat-insulating window film with a total thickness of 187μm includes a scratch-resistant layer of 14μm, a transparent film substrate layer of 80μm, a heat-insulating layer of 40μm, an ultraviolet blocking layer of 18μm, a pressure-sensitive adhesive layer of 10μm, and a release film layer of 25μm.

[0039] A method for preparing a high-reflectivity multilayer heat-insulating window film includes the following steps: S1. Apply anti-scratch coating liquid to one side of a polyethylene film by roller coating, dry at 120°C for 4 min, and light-cur for 38 s to obtain an anti-scratch layer. S2. Apply heat insulation coating material to the other side of the polyethylene film by roller coating, and dry at 140°C for 4 minutes to obtain the heat insulation layer. S3. Apply UV barrier coating material to the heat insulation layer by roller coating, dry at 140℃ for 4 min, and light-cur for 38 s to obtain UV barrier layer. S4. Apply acrylic pressure-sensitive adhesive to the UV blocking layer by roller coating and dry at 120°C for 4 minutes to obtain the pressure-sensitive adhesive layer. S5. Before winding, a PET release film is laminated onto the surface of the pressure-sensitive adhesive layer to obtain a high-reflectivity multilayer heat-insulating window film.

[0040] The anti-scratch coating liquid is prepared by the following method: 29 parts of polyurethane acrylate, 19 parts of bisphenol A epoxy diacrylate, 5 parts of photoinitiator ITX, 56 parts of xylene, and 3 parts of organic modified polysiloxane are stirred at 600 r / min for 50 min to obtain the anti-scratch coating liquid.

[0041] The heat-insulating coating is prepared by the following method: (1) Mix 14 parts of quartz, 10 parts of mica, 30 parts of tetraethyl orthosilicate with 70 parts of ethanol solution with a mass concentration of 80%, add 6 parts of dilute hydrochloric acid solution with a mass concentration of 50%, stir at 800 r / min for 50 min, let stand for 3 h to form a wet gel, age the wet gel, control the aging temperature at 65℃ and the aging time at 10 h, and then dry at 110℃ for 7 h to obtain silica aerogel. (2) The silica aerogel and the composite aldehyde solution were mixed in a mass ratio of 5:10. The silica aerogel was placed in the composite aldehyde solution (the composite aldehyde was prepared by mixing vanillin, myristaldehyde and perillaldehyde in a mass ratio of 5:2:3, and the composite aldehyde was added to ethylene glycol in a mass ratio of 50:9. The mixture was stirred at 400 r / min for 40 min). The mixture was stirred at 800 r / min for 1 h and then dried at 100 °C for 5 h to obtain the modified silica aerogel. (3) Mix 30 parts of modified silica aerogel, 10 parts of phenyl polysiloxane resin and 30 parts of polyurethane resin, add 18 parts of polyamide curing agent, 10 parts of carrageenan and 4 parts of silicone oil, and stir at 800 r / min for 50 min to obtain heat insulation coating.

[0042] The UV blocking layer coating material is prepared by the following method: 1) Mix 34 parts of sericite, 14 parts of dodecyltrimethylammonium bromide, 10 parts of succinic acid and 60 parts of water at 600 r / min for 20 min, ultrasonically disperse for 3 h, control the ultrasonic power at 800 W and the ultrasonic frequency at 24 kHz, centrifuge at 10000 r / min for 30 min, wash the centrifuged product with deionized water 3 times, and then dry at 80℃ for 3 h to obtain modified sericite; 2) 22 parts of modified sericite, 10 parts of diatomaceous earth and 60 parts of anhydrous ethanol were stirred and mixed at 600 r / min for 40 min. 100 parts of polymer solution (prepared by stirring and mixing 18 parts of polyamide amine, 8 parts of polyvinyl alcohol and 50 parts of dimethylformamide at 400 r / min for 30 min) were added and stirred and mixed at 800 r / min for 10 min. The mixture was then ultrasonically dispersed for 2 h, with the ultrasonic power controlled at 500 W and the ultrasonic frequency at 20 kHz. The mixture was washed twice with deionized water and dried at 60 °C for 2 h to obtain the ultraviolet blocking material. 3) Add 60 parts of UV blocking material to 31 parts of UV curing coating, then add 7 parts of sodium dodecyl sulfate and 3 parts of vinyltriamine, and stir and mix at 800 r / min for 30 min to obtain UV blocking coating material.

[0043] Comparative Example 1 is the same as Example 1, except that quartz and mica are not added to the silicon source used to prepare the silica aerogel, as detailed below: The heat-insulating coating is prepared by the following method: (1) Mix 26 parts of tetraethyl orthosilicate with 40 parts of 60% ethanol solution, add 4 parts of 50% dilute hydrochloric acid solution, stir at 600 r / min for 30 min, let stand for 1 h to form wet gel, age the wet gel, control the aging temperature at 45℃ and the aging time at 8 h, and then dry at 90℃ for 3 h to obtain silica aerogel. (2) The silica aerogel and the composite aldehyde solution were mixed in a mass ratio of 3:10. The silica aerogel was placed in the composite aldehyde solution (the composite aldehyde was prepared by mixing vanillin, myristaldehyde and perillaldehyde in a mass ratio of 3:2:1, and the composite aldehyde was added to ethylene glycol in a mass ratio of 50:5. The mixture was stirred at 400 r / min for 40 min). The mixture was stirred at 800 r / min for 1 h and then dried at 100 °C for 5 h to obtain the modified silica aerogel. (3) Mix 10 parts of modified silica aerogel, 8 parts of phenyl polysiloxane resin and 26 parts of polyurethane resin, add 10 parts of polyamide curing agent, 6 parts of carrageenan and 2 parts of silicone oil, and stir at 600 r / min for 30 min to obtain heat insulation coating material.

[0044] Comparative Example 2 is the same as Example 1, except that perillaldehyde is not added to the composite aldehyde, as detailed below: The heat-insulating coating is prepared by the following method: (1) Mix 10 parts of quartz, 6 parts of mica, 10 parts of tetraethyl orthosilicate with 40 parts of ethanol solution with a mass concentration of 60%, add 4 parts of dilute hydrochloric acid solution with a mass concentration of 50%, stir at 600 r / min for 30 min, let stand for 1 h to form a wet gel, age the wet gel, control the aging temperature at 45℃ and the aging time at 8 h, and then dry at 90℃ for 3 h to obtain silica aerogel. (2) The silica aerogel and the composite aldehyde solution were mixed in a mass ratio of 3:10. The silica aerogel was placed in the composite aldehyde solution (the composite aldehyde was prepared by mixing vanillin and myristaldehyde in a mass ratio of 3:2, and the composite aldehyde was added to ethylene glycol in a mass ratio of 50:5. The mixture was stirred at 400 r / min for 40 min). The mixture was stirred at 800 r / min for 1 h, and then dried at 100 °C for 5 h to obtain the modified silica aerogel. (3) Mix 10 parts of modified silica aerogel, 8 parts of phenyl polysiloxane resin and 26 parts of polyurethane resin, add 10 parts of polyamide curing agent, 6 parts of carrageenan and 2 parts of silicone oil, and stir at 600 r / min for 30 min to obtain heat insulation coating material.

[0045] Comparative Example 3 is the same as Example 1, except that myristaldehyde is not added to the composite aldehyde, as detailed below: The heat-insulating coating is prepared by the following method: (1) Mix 10 parts of quartz, 6 parts of mica, 10 parts of tetraethyl orthosilicate with 40 parts of ethanol solution with a mass concentration of 60%, add 4 parts of dilute hydrochloric acid solution with a mass concentration of 50%, stir at 600 r / min for 30 min, let stand for 1 h to form a wet gel, age the wet gel, control the aging temperature at 45℃ and the aging time at 8 h, and then dry at 90℃ for 3 h to obtain silica aerogel. (2) The silica aerogel and the composite aldehyde solution were mixed in a mass ratio of 3:10. The silica aerogel was placed in the composite aldehyde solution (the composite aldehyde was prepared by mixing vanillin and perillaldehyde in a mass ratio of 3:1, and the composite aldehyde was added to ethylene glycol in a mass ratio of 50:5. The mixture was stirred at 400 r / min for 40 min). The mixture was stirred at 800 r / min for 1 h, and then dried at 100 °C for 5 h to obtain the modified silica aerogel. (3) Mix 10 parts of modified silica aerogel, 8 parts of phenyl polysiloxane resin and 26 parts of polyurethane resin, add 10 parts of polyamide curing agent, 6 parts of carrageenan and 2 parts of silicone oil, and stir at 600 r / min for 30 min to obtain heat insulation coating material.

[0046] Comparative Example 4 is the same as Example 1, except that vanillin is not added to the composite aldehyde, as detailed below: The heat-insulating coating is prepared by the following method: (1) Mix 10 parts of quartz, 6 parts of mica, 10 parts of tetraethyl orthosilicate with 40 parts of ethanol solution with a mass concentration of 60%, add 4 parts of dilute hydrochloric acid solution with a mass concentration of 50%, stir at 600 r / min for 30 min, let stand for 1 h to form a wet gel, age the wet gel, control the aging temperature at 45℃ and the aging time at 8 h, and then dry at 90℃ for 3 h to obtain silica aerogel. (2) The silica aerogel and the composite aldehyde solution were mixed in a mass ratio of 3:10. The silica aerogel was placed in the composite aldehyde solution (the composite aldehyde was prepared by mixing myristaldehyde and perillaldehyde in a mass ratio of 2:1, and the composite aldehyde was added to ethylene glycol in a mass ratio of 50:5. The mixture was stirred at 400 r / min for 40 min). The mixture was stirred at 800 r / min for 1 h, and then dried at 100 °C for 5 h to obtain the modified silica aerogel. (3) Mix 10 parts of modified silica aerogel, 8 parts of phenyl polysiloxane resin and 26 parts of polyurethane resin, add 10 parts of polyamide curing agent, 6 parts of carrageenan and 2 parts of silicone oil, and stir at 600 r / min for 30 min to obtain heat insulation coating material.

[0047] Comparative Example 5 is the same as Example 1, except that polyurethane resin is used instead of phenyl polysiloxane resin, as detailed below: The heat-insulating coating is prepared by the following method: (1) Mix 10 parts of quartz, 6 parts of mica, 10 parts of tetraethyl orthosilicate with 40 parts of ethanol solution with a mass concentration of 60%, add 4 parts of dilute hydrochloric acid solution with a mass concentration of 50%, stir at 600 r / min for 30 min, let stand for 1 h to form a wet gel, age the wet gel, control the aging temperature at 45℃ and the aging time at 8 h, and then dry at 90℃ for 3 h to obtain silica aerogel. (2) The silica aerogel and the composite aldehyde solution were mixed in a mass ratio of 3:10. The silica aerogel was placed in the composite aldehyde solution (the composite aldehyde was prepared by mixing vanillin, myristaldehyde and perillaldehyde in a mass ratio of 3:2:1, and the composite aldehyde was added to ethylene glycol in a mass ratio of 50:5. The mixture was stirred at 400 r / min for 40 min). The mixture was stirred at 800 r / min for 1 h and then dried at 100 °C for 5 h to obtain the modified silica aerogel. (3) Mix 10 parts of modified silica aerogel and 34 parts of polyurethane resin, add 10 parts of polyamide curing agent, 6 parts of carrageenan and 2 parts of silicone oil, and stir at 600 r / min for 30 min to obtain heat insulation coating.

[0048] Comparative Example 6 is the same as Example 1, except that succinic acid is not added during the modification of sericite, as detailed below: The UV blocking layer coating material is prepared by the following method: 1) Mix 30 parts of sericite, 10 parts of dodecyltrimethylammonium bromide and 52 parts of water at 600 r / min for 20 min, disperse by ultrasonication for 1 h, control the ultrasonic power at 600 W and the ultrasonic frequency at 20 kHz, centrifuge at 10000 r / min for 30 min, wash the centrifuged product with deionized water 3 times, and then dry at 60℃ for 1 h to obtain modified sericite; 2) 18 parts of modified sericite, 8 parts of diatomaceous earth and 40 parts of anhydrous ethanol were stirred and mixed at 600 r / min for 40 min. 80 parts of polymer solution (prepared by stirring and mixing 10 parts of polyamide amine, 6 parts of polyvinyl alcohol and 30 parts of dimethylformamide at 400 r / min for 30 min) were added and stirred and mixed at 800 r / min for 10 min. The mixture was then ultrasonically dispersed for 1 h, with the ultrasonic power controlled at 500 W and the ultrasonic frequency at 20 kHz. The mixture was washed twice with deionized water and dried at 50 °C for 1 h to obtain the ultraviolet blocking material. 3) Add 40 parts of UV blocking material to 21 parts of UV curable coating, then add 5 parts of sodium dodecyl sulfate and 1 part of vinyltriamine, and stir and mix at 800 r / min for 30 min to obtain UV blocking coating material.

[0049] Comparative Example 7 is the same as Example 1, except that modified sericite is used instead of diatomaceous earth, as detailed below: The UV blocking layer coating material is prepared by the following method: 1) Mix 30 parts of sericite, 10 parts of dodecyltrimethylammonium bromide, 8 parts of succinic acid and 52 parts of water at 600 r / min for 20 min, ultrasonically disperse for 1 h, control the ultrasonic power at 600 W and the ultrasonic frequency at 20 kHz, centrifuge at 10000 r / min for 30 min, wash the centrifuged product with deionized water 3 times, and then dry at 60℃ for 1 h to obtain modified sericite; 2) 26 parts of modified sericite and 40 parts of anhydrous ethanol were stirred and mixed at 600 r / min for 40 min. 80 parts of polymer solution (prepared by stirring and mixing 10 parts of polyamide amine, 6 parts of polyvinyl alcohol and 30 parts of dimethylformamide at 400 r / min for 30 min) were added. The mixture was stirred and mixed at 800 r / min for 10 min, and then ultrasonically dispersed for 1 h. The ultrasonic power was controlled at 500 W and the ultrasonic frequency at 20 kHz. The mixture was washed twice with deionized water and dried at 50 °C for 1 h to obtain the ultraviolet blocking material. 3) Add 40 parts of UV blocking material to 21 parts of UV curable coating, then add 5 parts of sodium dodecyl sulfate and 1 part of vinyltriamine, and stir and mix at 800 r / min for 30 min to obtain UV blocking coating material.

[0050] Comparative Example 8 is the same as Example 1, except that polyamide amine is used instead of polyvinyl alcohol, as detailed below: The UV blocking layer coating material is prepared by the following method: 1) Mix 30 parts of sericite, 10 parts of dodecyltrimethylammonium bromide, 8 parts of succinic acid and 52 parts of water at 600 r / min for 20 min, ultrasonically disperse for 1 h, control the ultrasonic power at 600 W and the ultrasonic frequency at 20 kHz, centrifuge at 10000 r / min for 30 min, wash the centrifuged product with deionized water 3 times, and then dry at 60℃ for 1 h to obtain modified sericite; 2) 18 parts of modified sericite, 8 parts of diatomaceous earth and 40 parts of anhydrous ethanol were stirred and mixed at 600 r / min for 40 min. 80 parts of polymer solution (prepared by stirring and mixing 26 parts of polyamide amine and 30 parts of dimethylformamide at 400 r / min for 30 min) were added and stirred and mixed at 800 r / min for 10 min. The mixture was then ultrasonically dispersed for 1 h, with the ultrasonic power controlled at 500 W and the ultrasonic frequency at 20 kHz. The mixture was washed twice with deionized water and dried at 50 °C for 1 h to obtain the ultraviolet blocking material. 3) Add 40 parts of UV blocking material to 21 parts of UV curable coating, then add 5 parts of sodium dodecyl sulfate and 1 part of vinyltriamine, and stir and mix at 800 r / min for 30 min to obtain UV blocking coating material.

[0051] I. Performance Testing Comprehensive performance tests were conducted on the high-reflectivity multilayer heat-insulating window films obtained in Examples 1-3 and Comparative Examples 1-8.

[0052] 1. Hardness test According to GB / T 6739-2006 standard, a pencil was pressed vertically at a 45-degree angle onto the surface of the high-reflectivity multilayer heat-insulating window film obtained in Examples 1-3 and Comparative Examples 1-8 to make lines. The test results are shown in Table 1.

[0053] 2. Tensile strength test According to GB / T 1040.3-2006 standard, tensile strength tests were conducted on the surfaces of the high-reflectivity multilayer heat-insulating window films obtained in Examples 1-3 and Comparative Examples 1-8. The tensile speed was 100 mm / min, and the room temperature was 25℃. The test results are shown in Table 1.

[0054] 3. Ultraviolet blocking rate test The UV blocking rate of the high-reflectivity multilayer heat-insulating window films obtained in Examples 1-3 and Comparative Examples 1-8 was tested using a Hach DR6000 spectrophotometer in accordance with the national standard GB / T 2680-2021. The test results are shown in Table 1.

[0055] 4. Infrared blocking rate test The infrared blocking rate of the high-reflectivity multilayer heat-insulating window films obtained in Examples 1-3 and Comparative Examples 1-8 was tested using a solar film transmittance tester (model: YT1010) manufactured by Guangdong Sanenshi Technology Co., Ltd., with a test wavelength of 940nm. The test results are shown in Table 1.

[0056] 5. Shielding effectiveness Using a Kunheng Shunwei KSW-VSA01 spectrum analyzer and a Jiangsu Lianneng YE1311 signal generator, and referring to the national standard GB / T 30142-2013, signal tests were conducted on the high-reflectivity multilayer heat-insulating window films obtained in Examples 1-3 and Comparative Examples 1-8. The test results are shown in Table 1.

[0057] - Hardness (H) Tensile strength (MPa) UV blocking rate (%) Infrared blocking rate (%) Shielding effectiveness (dB) Example 1 3H 140 98.21 97.52 0 Example 2 3H 145 99.86 98.72 0 Example 3 3H 142 98.74 97.68 0 Comparative Example 1 2H 117 85.15 82.72 0 Comparative Example 2 2H 112 83.62 81.18 0 Comparative Example 3 2H 113 83.98 81.69 0 Comparative Example 4 2H 110 82.66 80.83 0 Comparative Example 5 2H 115 84.28 82.23 0 Comparative Example 6 2H 122 81.36 83.18 0 Comparative Example 7 2H 120 80.59 83.56 0 Comparative Example 8 2H 123 81.19 83.74 0 According to Table 1, a comparison between Examples 1-3 and Comparative Examples 1-8 shows that the mechanical and optical properties of the high-reflectivity multilayer heat-insulating window film prepared in Examples 1-3 are significantly better than those prepared in Comparative Examples 1-8. This indicates that the limitations on the raw materials and processes for preparing the heat insulation layer and the ultraviolet blocking layer in the preparation process of the high-reflectivity multilayer heat-insulating window film of this application will improve the overall performance of the high-reflectivity multilayer heat-insulating window film to a certain extent. The high-reflectivity multilayer heat-insulating window film prepared in this application has excellent properties such as high-efficiency heat insulation, ultraviolet blocking, scratch resistance, and strong signal penetration.

[0058] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for preparing a high-reflectivity multilayer heat-insulating window film, characterized in that, The steps include the following: S1. Apply an anti-scratch coating liquid to one side of the transparent film substrate layer by roller coating, and then cure it by light after drying to obtain an anti-scratch layer. S2. Apply heat insulation coating material to the other side of the transparent film substrate layer by roller coating, and obtain the heat insulation layer after drying. S3. Apply a UV blocking layer coating material to the heat insulation layer by roller coating, and then cure it by light after drying to obtain the UV blocking layer. S4. Apply pressure-sensitive adhesive to the ultraviolet blocking layer by roller coating, and obtain the pressure-sensitive adhesive layer after drying. S5. Before winding, a release film layer is laminated onto the surface of the pressure-sensitive adhesive layer to obtain a high-reflectivity multilayer heat-insulating window film.

2. The method for preparing the high-reflectivity multilayer heat-insulating window film according to claim 1, characterized in that, The transparent film substrate layer is one of polyester film, polyethylene film, and polyimide film.

3. The method for preparing the high-reflectivity multilayer heat-insulating window film according to claim 1, characterized in that, In step S1, the anti-scratch coating liquid is prepared by the following method: 25-29 parts of polyurethane acrylate, 15-19 parts of bisphenol A epoxy diacrylate, 3-5 parts of photoinitiator, 44-56 parts of xylene, and 1-3 parts of organic modified polysiloxane are stirred and mixed to obtain the anti-scratch coating liquid.

4. The method for preparing the high-reflectivity multilayer heat-insulating window film according to claim 1, characterized in that, In step S2, the heat-insulating coating material is prepared by the following method: (1) Mix 10-14 parts of quartz, 6-10 parts of mica, 10-30 parts of tetraethyl orthosilicate with 40-70 parts of ethanol solution, add 4-6 parts of dilute hydrochloric acid solution, stir and mix, let stand to form a wet gel, age the wet gel and dry to obtain silica aerogel. (2) Place the silica aerogel in a composite aldehyde solution, stir and mix, and dry to obtain modified silica aerogel; (3) Mix 10-30 parts of modified silica aerogel, 8-10 parts of phenyl polysiloxane resin and 26-30 parts of polyurethane resin, add 10-18 parts of curing agent, 6-10 parts of carrageenan and 2-4 parts of silicone oil, and stir to obtain heat insulation coating.

5. The method for preparing the high-reflectivity multilayer heat-insulating window film according to claim 4, characterized in that, In step (2), the mass ratio of silica aerogel to composite aldehyde solution is 3-5:

10.

6. The method for preparing the high-reflectivity multilayer heat-insulating window film according to claim 4, characterized in that, In step (2), the composite aldehyde solution is prepared by the following method: vanillin, myristaldehyde and perillaldehyde are mixed in a mass ratio of 3-5:2:1-3 to obtain a composite aldehyde, and ethylene glycol and composite aldehyde are added to ethylene glycol in a mass ratio of 50:5-9, and the mixture is stirred to obtain a composite aldehyde solution.

7. The method for preparing the high-reflectivity multilayer heat-insulating window film according to claim 1, characterized in that, In step S3, the UV blocking layer coating material is prepared by the following method: 1) Mix 30-34 parts of sericite, 10-14 parts of dodecyltrimethylammonium bromide, 8-10 parts of succinic acid and 52-60 parts of water, disperse by ultrasonication, centrifuge, wash with deionized water, and then dry to obtain modified sericite. 2) Mix 18-22 parts of modified sericite, 8-10 parts of diatomaceous earth and 40-60 parts of anhydrous ethanol, add 80-100 parts of polymer solution, continue mixing and stirring, disperse by ultrasonication, wash with deionized water, and dry to obtain UV blocking material. 3) Add 40-60 parts of UV blocking material to 21-31 parts of UV curable coating, then add 5-7 parts of sodium dodecyl sulfate and 1-3 parts of vinyltriamine, stir evenly to obtain UV blocking coating material.

8. The method for preparing the high-reflectivity multilayer heat-insulating window film according to claim 1, characterized in that, In step S4, the pressure-sensitive adhesive is an acrylic pressure-sensitive adhesive.

9. The method for preparing the high-reflectivity multilayer heat-insulating window film according to claim 1, characterized in that, In step S5, the release film layer is one of PET release film, PE release film, or BOPP release film.

10. A high-reflectivity multilayer heat-insulating window film, characterized in that, It is prepared by the method of any one of claims 1-9 for preparing high-reflectivity multilayer heat-insulating window film.

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