A heat-insulating anti-condensation glass film and its preparation method

Abstract

This application relates to the field of thermal insulation film processing technology, and more specifically, to an anti-condensation heat-insulating glass film and its preparation method. The film comprises a surface layer, a vacuum bubble layer, a base layer, an adhesive layer, and a release layer. Through the rational selection and optimized design of the surface layer and vacuum bubble layer materials, this application significantly improves the anti-condensation heat-insulating glass film in terms of heat insulation performance, anti-condensation effect, light transmission performance, and light distortion control, effectively solving the technical problems existing in current heat-insulating bubble films. In practical applications, it effectively prevents external heat from entering the room, reducing air conditioning energy consumption, and prevents condensation on the glass surface, ensuring the clarity and comfort of the indoor visual effect. It provides a superior solution for the field of window thermal insulation materials, meeting people's demand for high-quality window thermal insulation materials.

Description

Technical Field

[0001] This application relates to the field of heat insulation film processing technology, and more specifically, to an anti-condensation heat insulation glass film and its preparation method. Background Technology

[0002] With increasingly stringent requirements for building energy conservation, the research and application of window insulation materials have received widespread attention. Insulating bubble film, a common window insulation material, is applied to the glass surface to effectively reflect and absorb infrared radiation and other heat radiation from sunlight, preventing external heat from entering the room and thus achieving insulation. Simultaneously, the insulating film also increases the surface temperature of the inner side of the glass. When there is a temperature difference between the indoor and outdoor areas, it keeps the glass surface temperature above the dew point temperature, preventing water vapor from condensing into water droplets or ice crystals on the glass surface, thus preventing condensation.

[0003] However, in practical applications, existing heat-insulating bubble wrap has some problems that urgently need to be solved. After installation, when looking out from inside the house through the bubble wrap, the outlines of distant buildings become blurred, and details are difficult to discern. This phenomenon not only affects residents' daily activities—for example, causing blurred edges of text when reading near a window, increasing reading fatigue—but also significantly reduces living comfort. For high-rise residential buildings and other buildings that require good views of the scenery outside, this poor light transmission greatly affects the user experience. In addition, light distortion may occur when light passes through the heat-insulating bubble wrap; for example, the light from streetlights may become distorted, exhibiting wavy patterns, further exacerbating visual discomfort. The main reason for this is that the refractive indices of the materials in the multi-layer composite film are mismatched, resulting in significant reflection and refraction deviations at the interfaces of media with different refractive indices.

[0004] Therefore, how to improve the light transmittance of heat-insulating bubble film and reduce light distortion while ensuring heat insulation and anti-condensation performance has become a technical problem that urgently needs to be solved in the field of window insulation materials. Summary of the Invention

[0005] To address the issue of poor light transmittance in partially bubble-filled heat insulation films, this application provides an anti-condensation heat insulation glass film and its preparation method.

[0006] In a first aspect, this application provides an anti-condensation heat-insulating glass film, which adopts the following technical solution:

[0007] An anti-condensation heat-insulating glass film comprises, in sequence, a surface layer, a vacuum bubble layer, a base layer, an adhesive layer, and a release layer.

[0008] Preferably, the vacuum bubble layer is prepared from the following raw materials in parts by weight:

[0009] LLDPE 90-100 servings

[0010] 10-15 parts LDPE

[0011] 6-10 parts of ethylene-vinyl acetate copolymer

[0012] 5-8 parts of polycaprolactone

[0013] 3-5 parts plasticizer

[0014] 15-20 parts of modified halloysite powder.

[0015] Preferably, the surface layer is prepared from the following raw materials in parts by weight:

[0016] 50-80 parts of polyethylene

[0017] 20-30 parts of polyolefin elastomer

[0018] 4-8 parts of polyamide resin

[0019] 10-15 parts of nanocrystalline cellulose whiskers

[0020] Nucleating agent 0.5-1 part

[0021] 1-2 parts compatibilizer.

[0022] Preferably, the base layer is a PE layer.

[0023] By adopting the above technical solution, the resulting anti-condensation heat-insulating glass film exhibits significant improvements in heat insulation performance, anti-condensation effect, light transmission performance, and optical distortion control, effectively solving the technical problems existing in current heat-insulating bubble films. In practical applications, it effectively prevents external heat from entering the room, reducing air conditioning energy consumption, while also preventing condensation on the glass surface, ensuring clear and comfortable indoor visual effects. This provides a superior solution for the field of window insulation materials, meeting people's demand for high-quality window insulation materials.

[0024] By rationally selecting and optimizing the materials for the surface layer and the vacuum bubble layer, the refractive indices of each layer in the multi-layer composite film are more matched. When light passes through the heat-insulating bubble film, the difference in refractive index between different layers is reduced, and the reflection and refraction deviations of light at the interfaces of each medium are also reduced accordingly. This reduces optical distortion and avoids visual discomfort problems such as blurred outlines of distant buildings and distorted streetlights, thus improving the user's visual experience.

[0025] The material design of the surface layer contributes to improved light transmittance. Polyethylene, as one of the main components of the surface layer, has high light transmittance. Polyolefin elastomers can improve the flexibility and impact resistance of the surface layer, while their optical properties are relatively stable, without significantly absorbing or reflecting light. Polyamide resin can improve the heat resistance and chemical resistance of the surface layer to a certain extent, ensuring that the surface layer maintains good light transmittance during long-term use. Nanocrystalline cellulose whiskers have a unique nanostructure, which can effectively reduce light scattering and reflection in the surface layer, allowing light to pass through more smoothly. The addition of nucleating agents can improve the crystallinity of the material, making the internal structure of the surface layer material more uniform, thereby improving light transmittance. Compatibilizers can improve the compatibility between different materials in the surface layer, avoiding the impact on light transmittance due to material delamination or interface defects.

[0026] The synergistic effect of various raw materials in the vacuum bubble layer ensures that the bubbles are evenly distributed and have a regular shape, making the light propagation path through the bubble layer smoother, reducing scattering and refraction deviations, improving light transmission performance, and ensuring a clear and realistic visual effect.

[0027] The synergistic effect of LLDPE and LDPE provides excellent transparency and processing performance to the bubble layer, making it less prone to breakage and deformation during bubble formation and stabilization, while also resulting in more uniform and fine bubbles. Ethylene-vinyl acetate copolymer exhibits good adhesion, enhancing the bonding strength between the bubble layer and the surface and base layers, ensuring good adhesion between the bubble layer and other layers, and preventing uneven bubble distribution or deformation due to interlayer separation. Simultaneously, as a compatibilizer, it promotes the compatible dispersion of modified halloysite powder and the polymer matrix, resulting in better filler distribution and facilitating uniform bubble growth. EVA imparts flexibility to the bubble layer, allowing the bubbles to maintain a stable shape during processing and use, promoting uniform bubble distribution and regular shape formation, and preventing deformation or breakage.

[0028] Polycaprolactone reduces the crystallinity of the bubble layer, enhances flexibility and deformability, facilitates the uniform and stable formation of bubbles, prevents bubble shrinkage and rupture at low temperatures, and ensures uniformity at different temperatures. It also regulates bubble formation and growth. By reducing crystallinity and increasing melt strength, it makes it easier for bubbles to nucleate and grow uniformly, resulting in more uniform size and reduced scattering.

[0029] Modified halloysite powder provides numerous uniform nucleation sites for bubble formation, resulting in more uniform bubble nucleation, increased bubble number, smaller size, and more uniform distribution. This reduces light scattering and improves light transmittance. Simultaneously, it enhances the rigidity and hardness of the bubble layer, providing support and ensuring the bubbles maintain their regular shape during processing and use, preventing deformation or breakage that could increase light scattering. Furthermore, it constrains bubble growth, making their size more uniform.

[0030] The raw materials used in the vacuum bubble layer and the base layer are properly processed to have high light transmittance, ensuring that light loss is minimal when passing through these two layers. This improves the overall light transmittance of the film, making the view clearer when looking out from inside the film. The outlines and details of distant buildings can be more clearly identified, improving the visual experience for residents, especially for high-rise residential buildings and other buildings that require good views.

[0031] The PE (polyethylene) base layer effectively slows down heat conduction. In the multi-layered structure of the heat-insulating bubble film, the PE layer, as the base layer, works in conjunction with the vacuum bubble layer to further enhance the overall heat insulation effect of the film. Furthermore, PE material itself has high light transmittance, allowing light to pass through smoothly. As the base layer, it provides a good light-transmitting foundation for the entire film, enabling light to better penetrate the film and enter the room, thus improving the film's light transmittance performance.

[0032] Preferably, the modified halloysite powder is prepared by the following method:

[0033] 1) Mix halloysite powder, ethanol and silane coupling agent, heat to 40-50℃, react for 1-2 hours, filter and take the filter residue;

[0034] 2) Mix the filter residue, solvent, catalyst, and methacryloyl ethyl sulfobetaine, maintain the reaction temperature at 50-60℃, and react for 2-4 hours. After the reaction is complete, centrifuge, wash, and dry to obtain modified halloysite powder.

[0035] Preferably, the raw materials used to prepare the modified halloysite powder are in the following weight proportions:

[0036] 10 parts of halloysite powder

[0037] 50-100 parts of ethanol

[0038] 3-5 parts of silane coupling agent

[0039] 50-90 parts of solvent

[0040] 0.5-1 part catalyst

[0041] 5-10 parts of methacryloylethyl sulfobetaine.

[0042] By adopting the above technical solution, the optimization effect of the modified powder in the vacuum bubble layer of the heat insulation bubble film significantly improves the light transmittance of the bubble layer while maintaining good heat insulation effect. This allows the heat insulation bubble film to have higher light transmittance and better visual effect while ensuring heat insulation performance.

[0043] Silane coupling agents react with the hydroxyl groups on the surface of halloysite powder to form chemical bonds, while their other end can react with functional groups in the polymer matrix, enhancing the compatibility between the powder and the matrix. In the second step, substances such as methacryloxyethyl sulfobetaine are added to further introduce reactive functional groups onto the surface of the halloysite powder. This good compatibility and reactivity with the polymer matrix allows it to form a more stable network structure. This network structure supports and stabilizes the bubble shape, preventing deformation or breakage during processing or use, thus ensuring the regularity of the bubble shape, further reducing light scattering, and improving light transmittance.

[0044] Preferably, the plasticizer is composed of tributyl citrate and epoxidized soybean oil in a weight ratio of 1:(3-5).

[0045] By employing the above technical solutions, tributyl citrate imparts good flexibility to the material, allowing the heat insulation film to adhere tightly to the glass, reducing air bubbles and improving heat insulation performance; epoxidized soybean oil enhances durability and heat resistance, preventing the film from aging at high temperatures and extending its service life. The combination of these two not only improves the material's processing performance, making it easier to mold, but also enhances light transmittance and reduces optical distortion. High compatibility ensures uniform dispersion of the plasticizer, reducing light scattering and refraction deviations, guaranteeing heat insulation and anti-condensation performance while allowing for clearer and more natural light transmission.

[0046] Preferably, the polyamide resin has an average molecular weight of 3000-10000.

[0047] By adopting the above technical solution, the average molecular weight of the polyamide resin is optimized, and it interacts with components such as nanocrystalline cellulose whiskers to form a stable network. This enhances the mechanical properties and scratch resistance of the surface layer, extends the service life of the film, and ensures stable performance of the thermal insulation. The moderate molecular weight facilitates processing and molding, and allows for uniform mixing with other materials, resulting in a stable surface structure, uniform film thickness, and a smooth surface. This further optimizes light transmission, reduces optical distortion, and meets the requirements for both thermal insulation and good optical performance.

[0048] Preferably, the polyolefin elastomer is composed of polyolefin elastomer POE and olefin block copolymer in a weight ratio of 1:(2-5).

[0049] By employing the above technical solutions, POE imparts excellent flexibility and transparency to the material, enhancing the heat insulation effect of the anti-condensation heat-insulating glass film while maintaining high light transmittance. The olefin block copolymer provides superior mechanical properties and thermal stability, improving the tensile strength and impact resistance of the surface layer, ensuring the film is less prone to breakage during use and extending its service life. The combination of these two components improves the surface layer's processing performance, making it easier to mix uniformly with other materials, ensuring a stable surface layer structure, uniform film thickness, and a smooth surface. This not only helps reduce optical distortion and improve light transmittance but also enhances the film's weather resistance, enabling it to stably perform its heat insulation and anti-condensation properties under various environmental conditions, meeting the overall performance requirements of the technical solution for the surface layer.

[0050] Preferably, the nucleating agent is composed of dibenzyl sorbitol and Milliken Hyperform HPN-20E in a weight ratio of 1:(0.5-1).

[0051] By adopting the above technical solution and optimizing the type and dosage of nucleating agents, the crystallization of polymers such as polyethylene can be promoted, the crystallization rate can be accelerated, the polymer molecules can be arranged more orderly, and the grains can be refined. This improves the transparency and gloss of the surface layer, enhances optical performance, strengthens light transmission, reduces light scattering and refraction deviations in the surface layer, and thus reduces optical distortion, helping to solve the problem of poor light transmission performance of heat insulation bubble film. At the same time, this combination of nucleating agents can also improve the thermal stability and dimensional stability of the surface layer, making it less prone to deformation and shrinkage during processing and use. This is conducive to the stable performance of heat insulation and anti-condensation properties, and improves the mechanical properties of the surface layer, giving it better impact resistance and toughness, extending the service life of the heat insulation bubble film, and ensuring that it maintains good overall performance during long-term use.

[0052] Secondly, this application provides a method for preparing an anti-condensation heat-insulating glass film, which adopts the following technical solution:

[0053] A method for preparing an anti-condensation heat-insulating glass film includes the following preparation steps:

[0054] S1. Mix LLDPE, LDPE, ethylene-vinyl acetate copolymer, polycaprolactone, plasticizer and modified halloysite powder to obtain mixture A;

[0055] S2. After mixing, melt extrusion, and casting thermoforming of mixture A, a vacuum bubble layer is obtained;

[0056] S3. Composite one surface of the vacuum bubble layer with a PE film to obtain the first composite film;

[0057] S4. Mix polyethylene, polyolefin elastomer, polyamide resin, nanocrystalline cellulose whiskers, nucleating agent and compatibilizer to obtain mixture B;

[0058] S5. Extrude mixture B and cast it onto the side of the composite film away from the PE layer to obtain the first composite film;

[0059] S6. Coat the surface of the PE layer with polypropylene adhesive, cure it, and then attach a release film to the surface of the adhesive layer to obtain an anti-condensation heat-insulating glass film.

[0060] By employing the above-mentioned technical solution, this manufacturing process combines multiple high-performance materials and meticulous processing steps to achieve high-performance anti-condensation heat-insulating glass films. The vacuum bubble layer is prepared by optimizing the material formulation (LLDPE, LDPE, etc.) to form a uniform heat-insulating layer that effectively reflects and absorbs infrared rays, preventing heat transfer while simultaneously increasing the temperature inside the glass to prevent condensation. The composite with the PE layer enhances the film's flexibility and mechanical stability, ensuring its durability in practical applications. The surface layer is prepared by mixing materials such as polyethylene and polyolefin elastomers to form a protective layer with excellent optical properties and scratch resistance, improving light transmittance, reducing optical distortion, and maintaining good adhesion to the vacuum bubble layer. Finally, by coating the PE layer with polypropylene adhesive and bonding a release film, the film is ensured to be easy to install and firmly adhered. The entire process significantly improves the film's optical performance and mechanical strength while ensuring heat insulation and anti-condensation performance, meeting the high requirements of modern buildings for window insulation materials.

[0061] In summary, this application has the following beneficial effects:

[0062] 1. This anti-condensation heat-insulating glass film achieves significant improvements in heat insulation performance, anti-condensation effect, light transmission performance, and optical distortion control through a carefully designed multi-layer structure. The vacuum bubble layer utilizes the synergistic effect of LLDPE and LDPE to provide excellent transparency and processability, ensuring uniform and stable bubble distribution, reducing light scattering and refraction deviation, and enhancing light transmission. The surface layer, through a reasonable combination of polyethylene, polyolefin elastomers, and other components, improves light transmittance, flexibility, and impact resistance while maintaining stable optical performance. The base PE layer effectively slows down heat conduction, enhancing the heat insulation effect.

[0063] Figure 1 This is a schematic diagram of the overall structure of an anti-condensation heat-insulating glass film in Example 1;

[0064] Figure 2 This is a schematic diagram of the layer structure of an anti-condensation heat-insulating glass film in Example 1;

[0065] Reference numerals: 1. Top layer; 2. Vacuum bubble layer; 3. Base layer; 4. Adhesive layer; 5. Release layer. Detailed Implementation

[0066] Preparation Example 1

[0067] Halloysite powder is prepared by the following method:

[0068] 1) Mix 200g halloysite powder, 1000g ethanol and 60g silane coupling agent (aminopropyltriethoxysilane), heat to 40℃, react for 1h, filter, and take the filter residue;

[0069] 2) Mix the filter residue, 1000g of solvent (ethanol), 10g of catalyst (azobisisobutyronitrile), and 100g of methacryloylethyl sulfobetaine. Maintain the reaction temperature at 50℃ and react for 2 hours. After the reaction is complete, centrifuge, wash, and dry to obtain modified halloysite powder.

[0070] The difference between Preparation Examples 2-3 and Preparation Example 1 lies in the types, amounts, and parameters of raw materials used to prepare the modified halloysite powder. Specific differences are shown in Table 1.

[0071] Table 1. Types, dosages, and parameters of raw materials used in the preparation of modified halloysite powder

[0072] Example

[0073] The LLDPE was purchased from Dongguan Tianyu Chemical Co., Ltd., model number DFDA-2001.

[0074] The LDPE was purchased from Shenzhen Jiamaolong Plastics Trading Co., Ltd., and the model number is LDPE 2426K.

[0075] The ethylene-vinyl acetate copolymer was purchased from Beijing Huawirui Chemical Technology Co., Ltd., and the model number is [model number missing].

[0076] Polycaprolactone was purchased from Anhui Wanwei High-Tech Materials Co., Ltd., model number PCL 2000.

[0077] The polyethylene is ExxonMobil's Edge™ XP 7021.

[0078] The polyolefin elastomer POE is POE 7447 from Dow Chemical Company, USA.

[0079] The olefin block copolymer is Dow Chemical's INTUNE™ 10510.

[0080] The PE film was purchased from Dongguan Heli Packaging Products Co., Ltd., and its model is 500MM*0.02mm.

[0081] Example 1

[0082] A type of anti-condensation heat-insulating glass film, as described in the reference Figure 1 and Figure 2It comprises, in sequence, a surface 1, a vacuum bubble layer 2, a base layer 3, an adhesive layer 4, and a release layer 5, and is prepared by the following method:

[0083] S1. Mix 900g of LLDPE, 100g of LDPE, 60g of ethylene-vinyl acetate copolymer, 50g of polycaprolactone, 30g of plasticizer and 150g of modified halloysite powder to obtain mixture A;

[0084] The plasticizer is composed of tributyl citrate and epoxidized soybean oil in a weight ratio of 1:3;

[0085] S2. After mixing, melt extrusion, and casting thermoforming of mixture A, a vacuum bubble layer is obtained;

[0086] S3. Composite one surface of the vacuum bubble layer with a PE film to obtain the first composite film;

[0087] S4. Mix 500g of polyethylene, 200g of polyolefin elastomer, 40g of polyamide resin, 100g of nanocrystalline cellulose whiskers, 5g of nucleating agent and 10g of compatibilizer (HX® 2000) to obtain mixture B;

[0088] Polyolefin elastomers are composed of polyolefin elastomer (POE) and olefin block copolymers in a weight ratio of 1:2.

[0089] The nucleating agent is composed of dibenzyl sorbitol and Milliken Hyperform HPN-20E in a weight ratio of 1:0.5;

[0090] The polyamide resin is polyhexamethylene adipamide with an average molecular weight of 3000;

[0091] The compatibilizer was purchased from Jiangsu Huaxiao Chemical Co., Ltd., model number HX® 2000.

[0092] S5. Extrude mixture B and cast it onto the side of the composite film away from the PE layer to obtain the first composite film;

[0093] S6. Coat the surface of the PE layer with polypropylene adhesive, cure it, and then attach a release film to the surface of the adhesive layer to obtain an anti-condensation heat-insulating glass film.

[0094] The difference between Examples 2-3 and Example 1 lies in the types, amounts, and parameters of raw materials used to prepare the anti-condensation heat-insulating glass film. Specific differences are shown in Table 2.

[0095] Table 2. Raw material types, dosages, and parameters for preparing anti-condensation heat-insulating glass films.

[0096]

[0097] Example 4

[0098] An anti-condensation heat-insulating glass film, the difference between this embodiment and Embodiment 1 is that the plasticizer is tributyl citrate.

[0099] Example 5

[0100] An anti-condensation heat-insulating glass film, the difference between this embodiment and embodiment 1 is that the polyolefin elastomer is polyolefin elastomer POE.

[0101] Example 6

[0102] An anti-condensation heat-insulating glass film, the difference between this embodiment and Embodiment 1 is that the nucleating agent is dibenzyl sorbitol.

[0103] Comparative Example

[0104] Comparative Example 1

[0105] A type of anti-condensation heat-insulating glass film, the difference between this comparative example and Example 1 is that LDPE is not added.

[0106] Comparative Example 2

[0107] A heat-insulating anti-condensation glass film, the difference between this comparative example and Example 1 is that halloysite powder is used instead of modified halloysite powder.

[0108] Comparative Example 3

[0109] A heat-insulating and anti-condensation window film, the difference between this comparative example and Example 1 is that polylactic acid is used instead of polycaprolactone.

[0110] Polylactic acid was purchased from Anhui Fengyuan Biotechnology Co., Ltd., model number FY601.

[0111] Comparative Example 4

[0112] A heat-insulating and anti-condensation glass film, the difference between this comparative example and Example 1 is that: silica is used instead of nanocrystalline cellulose whiskers.

[0113] Comparative Example 5

[0114] A heat-insulating and anti-condensation glass film, the difference between this comparative example and Example 1 is that no polyamide resin is added.

[0115] Comparative Example 6

[0116] A heat-insulating and anti-condensation glass film, the difference between this comparative example and Example 1 is that polyurethane elastomer is used instead of polyolefin elastomer.

[0117] The polyurethane elastomer is TPU 1185A V0 from BASF, Germany.

[0118] Detection methods / test methods

[0119] Light transmittance: The light transmittance of the anti-condensation heat-insulating glass films prepared in Examples 1-6 and Comparative Examples 1-6 were measured using a light transmittance tester.

[0120] Optical distortion test: The anti-condensation heat-insulating glass films prepared in Examples 1-6 and Comparative Examples 1-6 were applied to the glass windows, and then photographed. It was ensured that the camera position, angle, and focal length remained consistent during shooting, and that the lighting conditions of the shooting environment were stable. The scenery inside and outside the glass windows was photographed separately. For the film-coated glass windows, the outlines of distant buildings were observed to ensure they were clear, straight lines remained straight, and streetlights were observed to exhibit any distortion, diffusion, or other abnormalities.

[0121] Thermal insulation efficiency test: In a laboratory with stable environmental conditions, the anti-condensation thermal insulation glass films prepared in Examples 1-6 and Comparative Examples 1-6 were bonded to glass windows. They were vertically mounted on two identical experimental frames, ensuring a good seal between the glass and the frames to prevent interference from outside airflow on heat transfer. The frames were wrapped with thermal insulation material to further reduce lateral heat transfer. High-precision heat sensors were placed on both sides of the glass to measure the temperature difference between the inside and outside of the glass and the heat transferred through the glass, calculating the heat transfer coefficient.

[0122] U = Q / (A * ΔT * t), where U is the heat transfer coefficient, Q is the heat transferred through the glass, A is the area of ​​the glass, ΔT is the temperature difference between the inside and outside of the glass, and t is time.

[0123] Anti-condensation test: Conducted in a constant temperature and humidity laboratory with an ambient temperature of 20℃ and a relative humidity of 60%. The anti-condensation heat-insulating glass films prepared in Examples 1-6 and Comparative Examples 1-6 were adhered to glass and placed in the experimental environment to ensure uniform surface temperature distribution. Timing was started, and the time when condensation began to appear on the surfaces of both glass pieces was observed and recorded. The experimental data are shown in Table 3.

[0124] Table 3 Experimental data of Examples 1-6 and Comparative Examples 1-6

[0125]

[0126] The experimental data above demonstrate that the technical solution in this application achieves significant improvements in thermal insulation performance, anti-condensation effect, light transmission performance, and light distortion control, effectively solving the technical problems existing in current thermal insulation bubble films and meeting people's demand for high-quality window thermal insulation materials.

[0127] Examples 1-6 all exhibited high light transmittance, ranging from 82.4% to 87.2%, while the comparative examples showed relatively low light transmittance, especially Comparative Examples 1, 3, 4, 5, and 6, all of which had light transmittance below 78%. This indicates that the film applied in the examples has minimal impact on the light transmittance of the glass, ensuring good light transmission.

[0128] In Examples 1-6, the film-coated glass did not exhibit obvious optical distortion phenomena such as blurred building outlines or distorted streetlights in the photographs taken, while the comparative examples all showed varying degrees of optical distortion. This indicates that the film in the examples has good optical performance and will not negatively affect the visual effect. In the comparative examples, the change in raw materials affected the uniformity of the refractive index distribution of the film, thereby altering the light propagation path and leading to optical distortion.

[0129] The heat transfer coefficient U-value of Example 1 is relatively low, at 2.4 W / (m²·K), while the U-values ​​of Comparative Examples 1-6 are relatively high. This indicates that the heat insulation film in Example 1 can effectively prevent heat transfer and has good heat insulation performance.

[0130] The condensation times in Examples 1-6 were all above 110 minutes, with the longest reaching 125 minutes, while the condensation times in the comparative examples were mostly below 105 minutes, with the shortest being only 80 minutes. This indicates that the film in the examples can significantly delay condensation on the glass surface and effectively improve anti-condensation performance. This is due to the synergistic effect of the vacuum bubble layer and the base layer of the film, which reduces the rate of temperature drop on the glass surface, thereby reducing the risk of condensation.

[0131] 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 heat-insulating and anti-condensation window film, characterized in that, It consists of, in sequence, a surface layer (1), a vacuum bubble layer (2), a base layer (3), an adhesive layer (4), and a release layer (5); The vacuum bubble layer is prepared from the following raw materials in parts by weight: LLDPE 90-100 servings 10-15 parts LDPE 6-10 parts of ethylene-vinyl acetate copolymer 5-8 parts of polycaprolactone 3-5 parts plasticizer 15-20 parts of modified halloysite powder; The modified halloysite powder was prepared by the following method: 1) Mix halloysite powder, ethanol and silane coupling agent, heat to 40-50℃, react for 1-2 hours, filter and take the filter residue; 2) Mix the filter residue, solvent, catalyst, and methacrylethyl sulfobetaine, maintain the reaction temperature at 50-60℃, and react for 2-4 hours. After the reaction is complete, centrifuge, wash, and dry to obtain modified halloysite powder. The plasticizer is composed of tributyl citrate and epoxidized soybean oil in a weight ratio of 1:(3-5); The surface layer is prepared from the following parts by weight of raw materials: 50-80 parts of polyethylene 20-30 parts of polyolefin elastomer 4-8 parts of polyamide resin 10-15 parts of nanocrystalline cellulose whiskers Nucleating agent 0.5-1 part 1-2 parts compatibilizer.

2. The anti-condensation heat-insulating glass film according to claim 1, characterized in that: The polyamide resin has an average molecular weight of 3000-10000.

3. The anti-condensation heat-insulating glass film according to claim 1, characterized in that: The polyolefin elastomer is composed of polyolefin elastomer POE and olefin block copolymer in a weight ratio of 1:(2-5).

4. The anti-condensation heat-insulating glass film according to claim 1, characterized in that: The nucleating agent is composed of dibenzyl sorbitol and Milliken Hyperform HPN-20E in a weight ratio of 1:(0.5-1).

5. The anti-condensation heat-insulating glass film according to claim 1, characterized in that: The base layer is a PE layer.

6. A method for preparing an anti-condensation heat-insulating glass film as described in any one of claims 1-5, characterized in that, The preparation steps include the following: S1. Mix LLDPE, LDPE, ethylene-vinyl acetate copolymer, polycaprolactone, plasticizer and modified halloysite powder to obtain mixture A; S2. After mixing, melt extrusion, and casting thermoforming of mixture A, a vacuum bubble layer is obtained; S3. Composite one surface of the vacuum bubble layer with a PE film to obtain the first composite film; S4. Mix polyethylene, polyolefin elastomer, polyamide resin, nanocrystalline cellulose whiskers, nucleating agent and compatibilizer to obtain mixture B; S5. Extrude mixture B and cast it onto the side of the composite film away from the PE layer to obtain the first composite film; S6. Coat the surface of the PE layer with polypropylene adhesive, cure it, and then attach a release film to the surface of the adhesive layer to obtain an anti-condensation heat-insulating glass film.

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