Sunshade curtain, preparation method thereof and vehicle

Abstract

The embodiment of the invention provides a sunshade curtain and a preparation method thereof and a vehicle, the sunshade curtain comprises a base cloth layer, a first functional layer and a second functional layer, the first functional layer and the second functional layer are located on the front face and the back face of the base cloth layer respectively, and the first functional layer comprises an optical enhancement layer, a weather-proof hot melting layer and an antifouling layer which are stacked in sequence; the second functional layer comprises 30 wt%-40 wt% of second film-forming resin, 30 wt%-60 wt% of second heat reflection filler, 0.5 wt%-1 wt% of a second dispersing agent, 0-5 wt% of color paste and 30 wt%-60 wt% of a second solvent. Through the second functional layer, the optical enhancement layer, the weather-proof hot melting layer and the antifouling layer which are stacked, the sunlight reflectivity can be improved, the temperature in the vehicle is reduced, the riding comfort is improved, and the service life of the vehicle is prolonged. And the second functional layer is in the parameter range of the scheme, so that the emissivity can be reduced, heat can be controlled to be radiated to the glass side, the head burning feeling of a driver and passengers is reduced, and the comfort in the vehicle is further improved.

Description

Technical Field

[0001] The present application relates to the field of sunshade materials, and in particular to a sunshade curtain, a preparation method thereof, and a vehicle. Background Art

[0002] Sunshades can block some sunlight from entering the car, reduce the heat generated by the transmission and absorption of sunlight, and help lower the temperature inside the car.

[0003] Currently, the sunshades used in cars are usually made of polyester cloth as the lining, polyester taffeta as the cotton cloth, and black polyethylene (PE) in the middle. The solar emissivity of the surface of this sunshade is generally below 50%. After the sunlight passes through the sunroof glass, most of it is absorbed by the sunshade and cannot effectively prevent the temperature inside the car from rising. Summary of the Invention

[0004] The embodiments of the present application provide a sunshade curtain, a method for preparing the same, and a vehicle, which are used to effectively prevent the temperature inside the vehicle from rising.

[0005] In a first aspect, an embodiment of the present application provides a sunshade curtain, comprising:

[0006] Base fabric layer;

[0007] a first functional layer located on the front surface of the base fabric layer, the first functional layer comprising an optical enhancement layer, a weather-resistant hot-melt layer, and an anti-fouling layer stacked in sequence;

[0008] a second functional layer located on the back side of the base fabric layer;

[0009] The second functional layer includes: 30%wt-40wt% of a second film-forming resin, 30wt%-60wt% of a second heat-reflective filler, 0.5wt%-1wt% of a second dispersant, 0-5wt% of a color paste, and 30wt%-60wt% of a second solvent.

[0010] In a possible implementation, the emissivity of the second functional layer is less than the emissivity of the first functional layer.

[0011] In one possible embodiment, the weather-resistant hot-melt layer includes: 15wt%-60wt% of an aliphatic yellowing-resistant thermoplastic polyurethane resin, 35wt%-60wt% of a first heat-reflective filler, 3wt%-8wt% of a flame retardant, 0.2wt%-1wt% of an anti-hydrolysis stabilizer, 0.2wt%-1wt% of an antioxidant, 1wt%-2wt% of an ultraviolet absorber, 1wt%-2wt% of an ultraviolet stabilizer, 0.5wt%-1w of a first dispersant, 0.5wt%-1wt% of a defoaming agent and 10wt%-40wt% of a first solvent.

[0012] In one possible embodiment, the aliphatic yellowing-resistant thermoplastic polyurethane resin includes: at least one of polyether thermoplastic polyurethane and polyester thermoplastic polyurethane;

[0013] And / or, the aliphatic yellowing-resistant thermoplastic polyurethane resin has an elongation at break of 500%-1000% and an elastic modulus of ≤20 MPa;

[0014] And / or, the first heat-reflecting filler comprises: at least one of titanium dioxide, barium sulfate, calcium carbonate and aluminum oxide;

[0015] And / or, the flame retardant includes: at least one of a phosphorus-nitrogen halogen-free flame retardant and an inorganic hydroxide halogen-free flame retardant;

[0016] And / or, the anti-hydrolysis stabilizer includes: polycarbodiimide;

[0017] And / or, the antioxidant comprises: at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate;

[0018] and / or, the ultraviolet absorber comprises at least one of 2,4-dihydroxybenzophenone-1,3,5-triazine, bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate and 2,4-dihydroxyphenyl-1,3,5-triazine;

[0019] And / or, the ultraviolet stabilizer includes: at least one of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly[6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl]-2,2,6,6-tetramethyl-4-piperidinol, and poly[6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl]-2,2,6,6-tetramethyl-4-piperidinol;

[0020] and / or, the first dispersant and the second dispersant include: at least one of a modified polyurethane dispersant, an acrylic dispersant, and a polyamide dispersant;

[0021] And / or, the defoaming agent comprises: at least one of: an organosilicon defoaming agent, a mineral oil defoaming agent, a polymer defoaming agent and a fatty acid defoaming agent;

[0022] and / or, the first solvent and the second solvent include at least one of dimethylformamide, dibasic acid esters, ethyl acetate and butyl acetate, propylene glycol methyl ether acetate, and propylene glycol methyl ether;

[0023] And / or, the second film-forming resin comprises: at least one of a polyurethane resin and an acrylic resin;

[0024] And / or, the second heat reflective filler includes at least one of aluminum powder, copper powder, zinc powder, nano silver wire and indium tin oxide powder.

[0025] In one possible implementation, the optical enhancement layer includes: 30% wt-40 wt % of a third film-forming resin, 0-40 wt % of a third heat-reflective filler, 0.5 wt %-1 wt % of a third dispersant, and 30 wt %-60 wt % of a third solvent.

[0026] In one possible embodiment, the third film-forming resin includes: at least one of polyurethane and acrylic resin;

[0027] And / or, the third heat-reflecting filler includes: aluminum powder;

[0028] And / or, the third dispersant includes: at least one of a modified polyurethane dispersant, an acrylic dispersant and a polyamide dispersant;

[0029] And / or, the third solvent includes at least one of cyclohexanone, ethanol, butyl acetate and butanone.

[0030] In a possible implementation, the anti-fouling layer includes: 20 wt % to 60 wt % of a fourth film-forming resin and 40 wt % to 80 wt % of a fourth solvent.

[0031] In one possible embodiment, the fourth film-forming resin includes: at least one of fluorocarbon-modified acrylic acid, silicone-modified acrylic acid, fluorocarbon-modified polyurethane, and silicone-modified polyurethane;

[0032] And / or, the fourth solvent includes at least one of butanone, toluene, acetone, ethanol, and butyl acetate.

[0033] In one possible embodiment, the thickness of the base fabric layer is 0.1 mm to 0.45 mm;

[0034] And / or, the optical enhancement layer has a thickness of 5 μm to 20 μm;

[0035] and / or, the thickness of the weather-resistant hot-melt layer is 30 μm-100 μm;

[0036] and / or, the antifouling layer has a thickness of 2 μm to 5 μm;

[0037] And / or, the thickness of the second functional layer is 3 μm-20 μm.

[0038] A second aspect provides a method for preparing the sunshade curtain according to the first aspect, the method comprising:

[0039] Coating an optical enhancement layer and a second functional layer on the front and back sides of the base fabric layer respectively;

[0040] sequentially coating a weather-resistant hot-melt layer and an anti-fouling layer on the surface of the optical enhancement layer away from the base fabric layer;

[0041] Among them, the emissivity of the second functional layer is greater than the emissivity of the first functional layer; the second functional layer includes: 30%wt-40wt% of a second film-forming resin, 30wt%-60wt% of a second heat-reflective filler, 0.5wt%-1wt% of a second dispersant, 0-5wt% of a color paste and 30wt%-60wt% of a second solvent.

[0042] In a third aspect, the present application provides a vehicle comprising the sunshade described in the first aspect, or the sunshade produced by the preparation method described in the second aspect.

[0043] The sunshade provided by the embodiment of the present application and its preparation method, vehicle, include a base fabric layer, a first functional layer located on the front of the base fabric layer, and a second functional layer located on the back of the base fabric layer, the first functional layer includes an optical enhancement layer, a weather-resistant hot-melt layer and an antifouling layer stacked in sequence, and the second functional layer includes 30% wt-40wt% of a second film-forming resin, 30wt%-60wt% of a second heat-reflecting filler, 0.5wt%-1wt% of a second dispersant, 0-5wt% of a color paste and 30wt%-60wt% of a second solvent. By stacking the second functional layer, the optical enhancement layer, the weather-resistant hot-melt layer and the antifouling layer, the solar transmittance and solar absorptivity can be effectively reduced, the solar reflectivity can be increased, the transfer of heat can be effectively blocked, the temperature inside the car under direct sunlight can be reduced, the ride comfort can be improved, energy can be saved, the service life of the vehicle can be extended, respiratory monitoring can be protected, and the normal operation of electronic equipment can be ensured. And when the second functional layer is within the parameter range of this solution, it helps to reduce the emissivity of the second functional layer, so that heat can be controlled to radiate to the glass side, reducing the burning sensation on the top of the driver's head and further improving the comfort inside the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0045] Figure 1 A schematic diagram of the structure of the sunshade provided in this application;

[0046] Figure 2 A schematic diagram of the structure of the experimental box provided for this application;

[0047] Figure 3 Schematic diagram of the test points provided for this application;

[0048] Figure 4 Schematic diagram of test results provided for this application;

[0049] Figure 5 Schematic diagram of test results provided for this application;

[0050] Figure 6 Schematic diagram of test results provided for this application;

[0051] Figure 7 Schematic diagram of the test results provided for this application.

[0052] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0053] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0054] Prolonged exposure to sunlight can cause the interior temperature of a car to rise, significantly reducing passenger comfort, disrupting normal physiological regulation, and affecting the driver's ability to drive. In severe cases, it can cause the driver to lose focus and increase the risk of traffic accidents. Furthermore, elevated interior temperatures can lead to increased energy consumption, interior aging, the release of harmful gases, and damage to electronic equipment.

[0055] The heat that causes the car's temperature to rise under sunlight mainly comes from: (1) the sunroof, front and rear windshields, and side windows that transmit sunlight into the car and convert it into heat; (2) the sunroof, front and rear windshields, and side windows that absorb sunlight and convert it into heat, and the heated glass transfers the heat into the car through secondary radiation.

[0056] Because car sunroofs provide natural light, fresh air, and a sense of spaciousness, and their customizable applications, coupled with increasing customer focus on sunlight exposure and in-car comfort, car sunroofs continue to evolve to meet these needs. Cars have evolved from no sunroofs, to small sunroofs, to panoramic sunroofs, and finally to panoramic skylights. The increasing size of car sunroofs allows more sunlight to enter the vehicle interior under direct sunlight. Consequently, the sunroofs of large-sized cars contribute over 50% of the heat that increases the vehicle's temperature.

[0057] For example, a sunshade can be used to block some sunlight from entering the car, reducing the heat generated by the transmission and absorption of sunlight, which helps to lower the temperature inside the car.

[0058] Currently, the sunshades used in cars are usually made of polyester cloth as the lining, polyester taffeta as the cotton cloth, and black polyethylene (PE) in the middle. The solar emissivity of the surface of this sunshade is generally below 50%. After the sunlight passes through the sunroof glass, most of it is absorbed by the sunshade and cannot effectively prevent the temperature inside the car from rising.

[0059] To this end, the present application provides a sunshade comprising an optical enhancement layer, a weather-resistant hot-melt layer, and an anti-fouling layer on the front surface of a base fabric layer, and a second functional layer on the back surface of the base fabric layer. This improves solar reflectivity, reduces the sunroof's solar transmittance and absorptivity, effectively blocks heat transfer, and reduces the temperature inside a vehicle under direct sunlight. Furthermore, the second functional layer of the present application has low emissivity, thereby controlling heat radiation toward the glass, reducing the burning sensation on the driver's head and further improving vehicle comfort.

[0060] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0061] Figure 1 The structural diagram of the sunshade provided in this application is as follows: Figure 1 As shown, the sunshade provided by this application includes:

[0062] Base fabric layer 101;

[0063] A first functional layer located on the front surface of the base fabric layer 101, the first functional layer comprising an optical enhancement layer 102, a weather-resistant hot-melt layer 103 and an anti-fouling layer 104 stacked in sequence;

[0064] a second functional layer 105 located on the back side of the base fabric layer 101;

[0065] The second functional layer 105 includes: 30% wt-40 wt% of a second film-forming resin, 30% wt-60% wt% of a second heat-reflective filler, 0.5% wt-1% of a second dispersant, 0-5% wt% of a color paste, and 30% wt-60% wt% of a second solvent.

[0066] In an embodiment of the present application, the base fabric layer is used to carry the first functional layer and the second functional layer; the first functional layer includes an optical enhancement layer, a weather-resistant hot-melt layer and an anti-fouling layer. The optical enhancement layer is used to improve the adhesion between the base fabric layer and the weather-resistant hot-melt layer, and can also reduce the transmission of sunlight into the vehicle; the weather-resistant hot-melt layer is used to reflect sunlight, resist moisture and heat, etc.; the anti-fouling layer can also be understood as a protective layer, which is used to resist dirt and scratches.

[0067] The second functional layer comprises 30-40 wt% of a second film-forming resin, 30-60 wt% of a second heat-reflecting filler, 0.5-1 wt% of a second dispersant, 0-5 wt% of a colorant, and 30-60 wt% of a second solvent. These materials, and their proportions, reduce the emissivity of the second functional layer, effectively blocking heat radiation to the glass, reducing the burning sensation felt by passengers and further improving interior comfort.

[0068] Among them, the second film-forming resin provides basic structure and bonding properties to ensure the uniform distribution and adhesion of other components; the second heat-reflective filler is used to enhance the physical properties of the coating, such as reflectivity, wear resistance and strength, and can also affect the optical properties of the coating; the second dispersant is used to evenly distribute fillers and pigments to prevent agglomeration, thereby ensuring the uniformity of the coating; the color paste is used to adjust the color and appearance of the layer; the second solvent is used to dissolve or disperse other components and adjust the viscosity and fluidity of the layer.

[0069] Based on the above structure and components, the sunshade of the embodiment of the present application has a solar reflectivity between 85% and 90%, a near-infrared reflectivity ≥85%, an emissivity of the first functional layer ≥0.9, an emissivity of the second functional layer ≤0.3, a solar shading rate of 100%, and an ultraviolet blocking rate of 100%, thereby increasing the solar reflectivity, reducing the solar transmittance and solar absorption rate of the skylight, effectively blocking the transfer of heat, reducing the temperature inside the vehicle under direct sunlight, improving driving safety, enhancing ride comfort, saving energy, extending the service life of the vehicle, protecting respiratory monitoring, ensuring the normal operation of electronic equipment, and reducing air-conditioning energy consumption, improving refrigeration efficiency, saving vehicle fuel and mileage.

[0070] It should be noted that emissivity is a physical quantity used to measure the ability of an object's surface to radiate heat outward. The higher the emissivity, the stronger the ability to release heat, and the lower the emissivity, the weaker the ability to release heat.

[0071] In addition, the sunshade provided in the embodiment of the present application can meet evaluation standards such as coating adhesion, flame retardancy, high temperature and moisture resistance, extreme high and low temperature resistance, banned substances and vehicle air.

[0072] For example, the mass percentage of the second film-forming resin can include 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or a range consisting of any two thereof. By controlling the mass percentage of the second film-forming resin to be 30%-40%, sufficient film-forming ability can be ensured while allowing effective dispersion and functional volatilization of other components.

[0073] The mass percentage of the second heat-reflective filler can include 30%, 35%, 40%, 45%, 50%, 55%, 60%, or any combination thereof. Controlling the mass percentage of the second heat-reflective filler to between 30% and 60% provides flexibility in adjusting the density, reflectivity, and mechanical properties of the second reflective layer. It should be noted that a higher mass percentage of the second heat-reflective filler helps improve reflectivity and wear resistance.

[0074] The mass percentage of the second dispersant may include 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or any combination thereof. By controlling the mass percentage of the second dispersant to be 0.5%-1%, the solid particles can be effectively dispersed without excessively affecting other properties of the second reflective layer.

[0075] The mass percentage of the colorant can include 0, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or any combination thereof. By controlling the mass percentage of the colorant to be 0-5%, the color intensity and hue can be adjusted as needed without affecting other properties.

[0076] The mass percentage of the second solvent may include 30%, 35%, 40%, 45%, 50%, 55%, 60%, or any two thereof. By controlling the mass percentage of the second solvent to be 30%-60%, the fluidity and drying time of the second reflective layer are ensured, while supporting the effective film formation of the film-forming resin.

[0077] In one possible embodiment, the emissivity of the second functional layer is less than that of the first functional layer, forming a gradient emissivity, that is, the coating close to the sunroof side has a low emissivity, and the coating away from the sunroof side has a high emissivity, thereby controlling the radiation of heat to the glass side and reducing the burning sensation on the driver and passengers' heads.

[0078] In one possible embodiment, the weather-resistant hot-melt layer includes: 15wt%-60wt% of an aliphatic anti-yellowing thermoplastic polyurethane resin, 35wt%-60wt% of a first heat-reflecting filler, 3wt%-8wt% of a flame retardant, 0.2wt%-1wt% of an anti-hydrolysis stabilizer, 0.2wt%-1wt% of an antioxidant, 1wt%-2wt% of a UV absorber, 1wt%-2wt% of a UV stabilizer, 0.5wt%-1wt% of a first dispersant, 0.5wt%-1wt% of a defoaming agent, and 10wt%-40wt% of a first solvent. Based on these components and their contents, the weather resistance of the coating is improved. Weather resistance refers to the ability of the weather-resistant layer to maintain its physical, chemical, and other properties when exposed to environmental conditions such as sunlight and humidity.

[0079] Among them, the aliphatic yellowing-resistant thermoplastic polyurethane resin has excellent yellowing resistance and can maintain color and transparency in ultraviolet rays or other environmental factors; the first heat-reflective filler is used to enhance the physical properties of the coating, such as hardness, wear resistance and strength; the flame retardant can improve the flame retardant properties of the coating, prevent burning at high temperatures, and improve safety; the hydrolysis resistance is used to improve the hydrolysis resistance of the coating and prevent chemical degradation in a humid environment; the antioxidant is used to prevent the coating from oxidative degradation under oxygen or high temperature conditions; the ultraviolet absorber is used to absorb ultraviolet radiation and improve the weather resistance of the coating; the first dispersant helps to evenly distribute the various materials in the coating to ensure the uniformity of each material; the defoamer is used to reduce bubbles in the coating formation process and improve the physical properties of the coating; the first solvent is used to dissolve or disperse the various materials in the coating for easy processing and application.

[0080] For example, the mass percentage of the aliphatic anti-yellowing thermoplastic polyurethane resin can include 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, or a range consisting of any two thereof. By controlling the mass percentage of the aliphatic anti-yellowing thermoplastic polyurethane resin to be 15%-60%, the yellowing resistance of the coating is improved.

[0081] The mass percentage of the first heat-reflecting filler may include 35%, 38%, 40%, 42%, 45%, 48%, 50%, 52%, 55%, 57%, 60%, or any two thereof. By controlling the mass percentage of the first heat-reflecting filler to 35%-60%, the hardness, wear resistance, and strength of the coating are improved.

[0082] The mass percentage of the flame retardant can include 3%, 4%, 5%, 6%, 7%, 8% or any two thereof. By controlling the mass percentage of the flame retardant to 3%-8%, it helps to improve the flame retardant properties of the coating.

[0083] The mass percentage of the anti-hydrolysis stabilizer can include 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or any two thereof. When the mass percentage of the anti-hydrolysis stabilizer is 0.2%-1%, it helps to improve the hydrolysis resistance of the coating.

[0084] The mass percentage of the antioxidant can include 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or any two thereof. The mass percentage of the antioxidant is 0.2%-1%, which helps to improve the oxidation performance of the coating.

[0085] The mass percentage of the ultraviolet absorber can include 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2% or any two thereof. The mass percentage of the ultraviolet absorber is 1%-2%, which helps to improve the weather resistance of the coating.

[0086] The mass percentage of the first dispersant may include 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or any two thereof. By controlling the mass percentage of the first dispersant to be 0.5%-1%, it helps to improve the dispersion uniformity of each material in the coating.

[0087] The mass percentage of the defoaming agent can include 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or any two thereof. By controlling the mass percentage of the defoaming agent to be 0.5%-1%, it helps to reduce bubbles during the coating formation process.

[0088] The mass percentage of the first solvent may include 10%, 15%, 20%, 25%, 30%, 35%, 40% or any two thereof. By controlling the mass percentage of the first solvent to be 10%-40%, it is helpful to dissolve or disperse the materials required for forming the coating.

[0089] In a possible implementation, the base fabric layer may be made of polyester Oxford cloth or knitted cloth, and the texture of the base fabric layer may be the same as the texture inside the vehicle roof to ensure consistency in appearance.

[0090] In one possible embodiment, the aliphatic, yellowing-resistant thermoplastic polyurethane resin may include at least one of a polyether thermoplastic polyurethane and a polyester thermoplastic polyurethane. Polyether thermoplastic polyurethanes maintain good flexibility and elasticity even at low temperatures. Polyester thermoplastic polyurethanes have better thermal stability at higher temperatures. Polyether thermoplastic polyurethanes may include polyoxypropylene ethers and polytetramethylenetetramethylene ethers, while polyester thermoplastic polyurethanes may include polycaproate-based polyurethanes and poly(1,6-hexanediol adipate-based polyurethanes).

[0091] In one possible embodiment, the elongation at break of the aliphatic, yellowing-resistant thermoplastic polyurethane resin is 500%-1000%. This resin exhibits exceptionally high ductility and flexibility, making the coating less susceptible to breakage or damage during stretching or bending. The elastic modulus of the aliphatic, yellowing-resistant thermoplastic polyurethane resin is ≤20 MPa, allowing it to absorb mechanical forces and protect the coating from the propagation of microcracks.

[0092] In one possible embodiment, the first heat-reflective filler includes at least one of titanium dioxide, barium sulfate, calcium carbonate, and aluminum oxide. Titanium dioxide has excellent light and weather resistance and can improve the hardness and wear resistance of the coating. Barium sulfate's high density can increase the weight and density of the coating and has good chemical inertness, which helps improve the material's chemical corrosion resistance. Calcium carbonate can increase the rigidity and strength of the coating. Aluminum oxide has high hardness and can improve the coating's wear resistance, high temperature resistance, and thermal stability.

[0093] In one possible embodiment, the flame retardant may include at least one of a phosphorus-nitrogen halogen-free flame retardant and an inorganic hydroxide halogen-free flame retardant. Phosphorus-nitrogen flame retardants generally have a high flame retardant efficiency, can achieve a good flame retardant effect at a lower addition amount, and have good thermal stability, suitable for use at higher temperatures. In addition to being flame-retardant, inorganic hydroxide halogen-free flame retardants can also decompose and absorb heat at high temperatures, reducing the surface temperature of the material. Phosphorus-nitrogen halogen-free flame retardants may include ammonium polyphosphate, phosphazene compounds, etc., and inorganic hydroxide halogen-free flame retardants may include magnesium hydroxide, aluminum hydroxide, etc.

[0094] In a possible embodiment, the anti-hydrolysis stabilizer may include polycarbodiimide, which can improve the hydrolysis resistance of the coating, prevent the coating from hydrolytic degradation, and extend the service life of the coating.

[0095] In one possible embodiment, the antioxidant includes at least one of two hindered phenolic antioxidants: pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (e.g., 1010) and octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (e.g., 1076). Pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] has a polyphenolic structure that effectively captures free radicals, preventing the oxidative degradation of polymers and maintaining its antioxidant function even under high temperature conditions. Octadecanol β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate effectively neutralizes free radicals, preventing polymer breakage and degradation, and is compatible with a variety of polymer matrices, ensuring uniform antioxidant protection.

[0096] In one possible embodiment, the UV absorber includes at least one of 2,4-dihydroxybenzophenone-1,3,5-triazine (e.g., UV400), bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (e.g., UV1577), and 2,4-dihydroxyphenyl-1,3,5-triazine (e.g., UV1600). 2,4-Dihydroxybenzophenone-1,3,5-triazine can effectively absorb ultraviolet rays, especially in the UV-A and UV-B bands, providing broad-spectrum ultraviolet protection. It also has excellent photostability and can maintain its function even under long-term exposure to sunlight. In addition to absorbing ultraviolet rays, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate also functions as a light stabilizer, preventing photodegradation by capturing free radicals and significantly improving the weather resistance of the material. 2,4-Dihydroxyphenyl-1,3,5-triazine can effectively absorb ultraviolet rays in the UV-A and UV-B bands, providing comprehensive ultraviolet protection. It also has excellent chemical stability and is not easily degraded, ensuring long-term ultraviolet protection.

[0097] In one possible embodiment, the UV stabilizer includes at least one of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (e.g., UV770), poly[6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl]-2,2,6,6-tetramethyl-4-piperidinol (e.g., UV622), and poly[6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl]-2,2,6,6-tetramethyl-4-piperidinol (e.g., UV944). Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, as a hindered amine light stabilizer (HALS), can effectively capture free radicals, preventing photodegradation, and significantly improving the material's weather resistance and extending its service life. Poly[6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl]-2,2,6,6-tetramethyl-4-piperidinol provides excellent UV stability, effectively preventing photodegradation of the material, and has a longer shelf life and long-lasting protective effect. Poly[6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl]-2,2,6,6-tetramethyl-4-piperidinol also provides excellent UV stability, preventing photodegradation of the material.

[0098] In one possible embodiment, both the first and second dispersants may include at least one of a modified polyurethane dispersant, an acrylic dispersant, and a polyamide dispersant. Modified polyurethane dispersants have multiple functional groups that can interact with a variety of pigments and fillers, providing excellent dispersing effects. Acrylic dispersants generally have high dispersing efficiency and can achieve good dispersing effects at relatively low addition levels. Polyamide dispersants have excellent heat resistance and are suitable for materials processed at high temperatures.

[0099] In one possible embodiment, the defoamer includes at least one of a silicone defoamer, a mineral oil defoamer, a polymer defoamer, and a fatty acid defoamer. Silicone defoamers are primarily composed of polysiloxane (silicone oil) and silicone resin, exhibit excellent thermal stability and chemical inertness, and are suitable for use in high-temperature and chemically reactive environments. Mineral oil defoamers are based on mineral oil and typically contain hydrophobic solid particles and an emulsifier, resulting in lower costs. Polymer defoamers are made from polymer materials such as polyethers and polyacrylates, exhibiting excellent compatibility and a long-lasting defoaming effect. Fatty acid defoamers are based on fatty acids and their ester compounds and are highly biodegradable.

[0100] In one possible embodiment, both the first solvent and the second solvent may include at least one of dimethylformamide (DMF), dibasic acid ester (DBE), ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, and propylene glycol methyl ether. Dimethylformamide is a highly polar solvent that can dissolve a variety of polar and non-polar compounds, particularly polymers and organic compounds. Dibasic acid esters have low toxicity and better environmental performance, effectively dissolving a variety of polymers and resins. Ethyl acetate can dissolve a variety of resins and polymers and is commonly used in coatings and adhesives. Butyl acetate can dissolve a variety of resins and polymers and is widely used in coatings and inks. Propylene glycol methyl ether acetate has excellent solvency and can dissolve a variety of polar and non-polar substances. It also has low volatility, which helps improve the leveling and gloss of the coating. Propylene glycol methyl ether effectively dissolves a variety of resins, dyes, and other chemicals and has low toxicity and high biodegradability.

[0101] In one possible embodiment, the second film-forming resin includes at least one of a polyurethane resin and an acrylic resin. Polyurethane has excellent elasticity, abrasion resistance, and impact resistance, and has good adhesion to a variety of substrates, making it suitable for use in coatings and adhesives. Acrylic resin has excellent UV and weather resistance, making it suitable for long-term outdoor use.

[0102] In one possible embodiment, the second heat-reflective filler includes: at least one of aluminum powder, copper powder, zinc powder, nano silver wire and indium tin oxide powder. Aluminum powder has excellent light-reflecting properties and is often used in coatings and pigments that require high reflectivity. It can also improve the electrical conductivity and thermal conductivity of the material. Copper powder is an excellent conductive material and is widely used in conductive coatings and electronic applications. Zinc powder is often used in anti-corrosion coatings, especially for cathodic protection of steel. It is also conductive and can be used in conductive coatings. Nano silver wire has extremely high conductivity and is suitable for transparent conductive films and electronic devices. Due to its nano size, the silver wire can provide conductivity while maintaining transparency. Indium tin oxide powder has high light transmittance and low resistivity, and has good stability in many chemical environments.

[0103] In some optional embodiments, the optical enhancement layer includes: 30%wt-40wt% of a third film-forming resin, 0-40wt% of a third heat-reflective filler, 0.5wt%-1wt% of a third dispersant, and 30wt%-60wt% of a third solvent. The third film-forming resin is the main component of the hot melt adhesive, provides basic bonding properties and structure, can form a continuous film layer, and ensure the adhesion and mechanical strength of the optical enhancement layer. The third heat-reflective filler is used to enhance the electrical conductivity, thermal conductivity or mechanical strength of the optical enhancement, and can also affect the viscosity and rheology of the optical enhancement. The third dispersant helps to evenly distribute the filler and other solid components to prevent agglomeration, thereby ensuring the uniformity and performance consistency of the optical enhancement. The third solvent is used to dissolve or disperse other components and adjust the viscosity and rheology of the optical enhancement for easy processing and application.

[0104] For example, the mass percentage of the third film-forming resin may include 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or any two thereof. By controlling the mass percentage of the third film-forming resin to be 30%-40%, sufficient film-forming ability and bonding performance are ensured while allowing effective dispersion and function of other components.

[0105] The mass percentage of the third heat reflective filler can include 0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, or any two thereof. By controlling the mass percentage of the third heat reflective filler to be 0-40%, the range of 0-40wt% provides flexibility to adjust the density, functional properties, and mechanical properties of the optical enhancement.

[0106] The mass percentage of the third dispersant may include 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, or any two thereof. By controlling the mass percentage of the third dispersant to be 0.5%-1%, the solid particles can be effectively dispersed without excessively affecting other optical enhancement properties, such as viscosity and adhesion.

[0107] The mass percentage of the third solvent can include 30%, 35%, 40%, 45%, 50%, 55%, 60%, or a range consisting of any two thereof. By controlling the mass percentage of the third solvent to 30%-60%, appropriate fluidity and drying time for optical enhancement are ensured while supporting effective film formation of the film-forming resin. A higher solvent content can reduce viscosity and improve coating performance.

[0108] In one possible embodiment, the third film-forming resin includes at least one of polyurethane and acrylic resin. Polyurethane has excellent elasticity, abrasion resistance, and impact resistance, and has good adhesion to a variety of substrates, making it suitable for use in coatings and adhesives. Acrylic resin has excellent UV and weather resistance, making it suitable for long-term outdoor use.

[0109] In one possible embodiment, the third heat-reflective filler includes aluminum powder. Aluminum powder has excellent light-reflecting properties and is often used in coatings and pigments that require high reflectivity. It can also improve the electrical and thermal conductivity of materials.

[0110] In one possible embodiment, the third dispersant includes at least one of a modified polyurethane dispersant, an acrylic dispersant, and a polyamide dispersant. Modified polyurethane dispersants have multiple functional groups that can interact with a variety of pigments and fillers, providing excellent dispersing effects. Acrylic dispersants generally have high dispersing efficiency and can achieve good dispersing effects at relatively low addition levels. Polyamide dispersants have excellent heat resistance and are suitable for materials processed at high temperatures.

[0111] In one possible embodiment, the third solvent includes at least one of cyclohexanone, ethanol, butyl acetate, and butanone. Cyclohexanone can dissolve a variety of resins and polymers, has a moderate volatility, and can provide good leveling and coating uniformity. Ethanol is a relatively safe solvent with good biodegradability and low toxicity. Butyl acetate can effectively dissolve a variety of resins and polymers, can provide good leveling and gloss, and is suitable for high-quality coating applications. Butanone can quickly dissolve a variety of polymers and resins and is particularly suitable for applications requiring high solvency. Its rapid volatility makes it suitable for coatings and inks that require fast drying.

[0112] In some optional embodiments, the antifouling layer comprises 20-60 wt% of a fourth film-forming resin and 40-80 wt% of a fourth solvent. The fourth film-forming resin provides the underlying structure and protective properties, forming a continuous film layer that resists the adhesion of dirt, dust, and other contaminants. The fourth solvent dissolves the film-forming resin, ensuring uniform coating and film formation.

[0113] For example, the mass percentage of the fourth film-forming resin can include 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, or a range consisting of any two thereof. By controlling the mass percentage of the fourth film-forming resin to be 20%-60%, sufficient flexibility is provided to adjust the thickness and performance of the film. Among them, a lower resin content can improve the flexibility of the coating, while a higher content enhances the durability and protective properties of the film.

[0114] The mass percentage of the fourth solvent may include 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, or a range consisting of any two thereof. By controlling the mass percentage of the fourth solvent to be 40%-80%, the fluidity and drying speed of the coating can be precisely controlled. A higher solvent content can reduce viscosity and improve coating performance, while a lower solvent content helps form a thicker and more durable film.

[0115] In one possible embodiment, the third film-forming resin includes: at least one of fluorocarbon-modified acrylic, silicone-modified acrylic, fluorocarbon-modified polyurethane and silicone-modified polyurethane. The fluorocarbon group in fluorocarbon-modified acrylic provides excellent UV resistance and weather resistance, which makes the coating have a longer service life in outdoor environments, and the fluorocarbon modification reduces the surface energy, giving the coating excellent anti-fouling and self-cleaning properties. The silicone modification in silicone-modified acrylic improves the heat resistance of the coating, and the hydrophobic properties of silicone enhance the waterproof properties of the coating. Fluorocarbon-modified polyurethane combines the advantages of fluorocarbon and polyurethane, providing excellent chemical resistance and weather resistance, and the low surface energy characteristics of fluorocarbon provide excellent anti-fouling and self-cleaning properties. The silicone modification in silicone-modified polyurethane improves the flexibility and elasticity of polyurethane, and the hydrophobicity of silicone enhances the waterproof and moisture-proof properties of the coating.

[0116] In one possible embodiment, the fourth solvent includes at least one of butanone, toluene, acetone, ethanol, and butyl acetate. Butanone can quickly dissolve a variety of polymers and resins, and its rapid volatility makes it suitable for coatings and inks that require fast drying. Toluene can dissolve a variety of organic substances, and its moderate volatility makes it suitable for a variety of coating and ink applications. Acetone is a very effective solvent that can dissolve a variety of polar and non-polar substances. Ethanol is a relatively safe solvent with good biodegradability and low toxicity. Butyl acetate can effectively dissolve a variety of resins and polymers and can provide good leveling and gloss.

[0117] In one possible embodiment, the base fabric layer has a thickness of 0.1 mm to 0.45 mm. A thinner base fabric layer provides greater flexibility and lightness, while a thicker base fabric layer enhances strength and durability. By controlling the base fabric layer thickness to 0.1 mm to 0.45 mm, the base fabric layer can have a certain degree of flexibility and strength, thereby ensuring the support and strength of the base fabric layer.

[0118] For example, the thickness of the base fabric layer may include 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, or a range consisting of any two thereof.

[0119] In a possible embodiment, the thickness of the optical enhancement layer is 5 μm-20 μm. By controlling the thickness of the optical enhancement layer to be 5 μm-20 μm, good bonding performance can be ensured, and the base fabric layer and the weather-resistant hot-melt layer can be effectively bonded together.

[0120] For example, the thickness of the optical enhancement layer may be 5 μm, 7 μm, 9 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, or a range consisting of any two thereof.

[0121] In one possible embodiment, the thickness of the weather-resistant hot melt layer is 30 μm-100 μm. By controlling the thickness of the weather-resistant hot melt layer to be 30 μm-100 μm, the service life and weather resistance of the weather-resistant hot melt layer can be improved.

[0122] For example, the thickness of the weather resistant hot melt layer may include 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm or a range consisting of any two thereof.

[0123] In one possible embodiment, the antifouling layer has a thickness of 2 μm to 5 μm. By controlling the thickness of the antifouling layer to 2 μm to 5 μm, the weather-resistant hot-melt layer can be weather-protected. A thinner antifouling layer will affect the protective effect of the weather-resistant hot-melt layer, while a thicker antifouling layer will harden the antifouling layer, affecting the solar reflectivity of the weather-resistant hot-melt layer.

[0124] For example, the thickness of the antifouling layer may be in the range of 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, 5 μm, or any two thereof.

[0125] In a possible embodiment, the thickness of the second functional layer is 3 μm-20 μm. By controlling the thickness of the second functional layer to be 3 μm-20 μm, a lower emissivity can be provided, which helps to reduce the temperature inside the vehicle.

[0126] For example, the thickness of the second functional layer may be 3 μm, 5 μm, 7 μm, 9 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, or a range consisting of any two thereof.

[0127] In a second aspect, the present application provides a method for preparing a sunshade curtain, comprising:

[0128] S101, coating an optical enhancement layer and a second functional layer on the front and back surfaces of the base fabric layer respectively;

[0129] S102, coating a weather-resistant hot-melt layer and an anti-fouling layer in sequence on a surface of the optical enhancement layer away from the base fabric layer;

[0130] The second functional layer includes: 30%wt-40wt% of a second film-forming resin, 30wt%-60wt% of a second heat-reflective filler, 0.5wt%-1wt% of a second dispersant, 0-5wt% of a color paste and 30wt%-60wt% of a second solvent.

[0131] For example, a weather-resistant hot-melt layer and an anti-fouling layer can be coated on a double-sided release film in sequence, and then the double-sided release film coated with the weather-resistant hot-melt layer and the anti-fouling layer and the base fabric layer coated with the optical enhancement layer and the second functional layer are laminated together, and then the release film is peeled off to form a sunshade.

[0132] For example, the weather-resistant hot-melt layer and the optical enhancement layer are in contact, and the lamination temperature during lamination is 110°C-130°C, and the lamination speed is 1m / min-10m / min. By controlling the lamination temperature to 110°C-130°C, the optical enhancement layer can achieve appropriate viscosity, ensuring good bonding performance and interlayer adhesion. By controlling the lamination speed to 1m / min-10m / min, more uniform pressure distribution and better lamination quality can be ensured, and production efficiency can be improved.

[0133] For example, the lamination temperature may be 110° C., 112° C., 114° C., 116° C., 118° C., 120° C., 122° C., 124° C., 126° C., 128° C., 130° C., or a range consisting of any two thereof.

[0134] The lamination speed may be 1 m / min, 2 m / min, 3 m / min, 4 m / min, 5 m / min, 6 m / min, 7 m / min, 8 m / min, 9 m / min, 10 m / min, or a range consisting of any two thereof.

[0135] In one possible embodiment, the base fabric is subjected to a halogen-free flame retardant treatment and / or a fluorine-free waterproof treatment to obtain a base fabric layer. The halogen-free flame retardant treatment does not release halogenated gases, has little impact on the environment, and can provide effective flame retardant protection. The fluorine-free waterproof treatment can provide excellent waterproof performance.

[0136] In a third aspect, the present application provides a vehicle comprising the above-mentioned sunshade, or the sunshade produced by the above-mentioned preparation method.

[0137] The present invention is further described below through specific examples.

[0138] It should be noted that the performance of sunshades can be obtained by testing from the product side.

[0139] The performance testing method of the sunshade provided in this application can be shown in Table 1.

[0140] Table 1 Test method for performance parameters of thermal control skylight sunshade

[0141]

[0142] Example 1

[0143] (1) Mixing 60 wt% of organosilicon-modified polyurethane and 40 wt% of butanone to obtain a slurry for an antifouling layer;

[0144] (2) 35 wt% of aliphatic yellowing-resistant thermoplastic polyurethane resin (elongation at break 600%, elastic modulus 10 MPa), 30 wt% of titanium dioxide, 10 wt% of aluminum oxide, 5 wt% of phosphorus-nitrogen powder flame retardant 6000B, 0.2 wt% of polycarbodiimide, 0.2 wt% of 1010, 0.5 wt% of UV400, 0.5 wt% of UV770, 0.5 wt% of polyurethane dispersant BYK163, 0.5 wt% of silicone defoamer BYK077N, and 17.6 wt% of butyl acetate solvent were mixed to obtain a slurry for a weather-resistant hot-melt layer;

[0145] (3) Mixing 35 wt% of polyurethane resin, 30 wt% of aluminum powder, 0.5 wt% of polyurethane dispersant BYK163, and 34.5 wt% of DMF to obtain a slurry for an optical enhancement layer;

[0146] (4) Mixing 40 wt% of acrylic resin, 30 wt% of aluminum powder, 0.5 wt% of polyurethane dispersant BYK163, 2 wt% of black color paste, and 27.5 wt% of butyl acetate to obtain a slurry for the second functional layer;

[0147] (5) The slurry of step (3) is applied to the front side of a knitted polyester fabric having a thickness of 0.4 mm and subjected to flame retardant treatment, and the coating thickness is 5 μm. The slurry of step (4) is applied to the north side of the knitted polyester fabric, and the coating thickness is 5 μm.

[0148] (6) The slurries of step (2) and step (1) are sequentially coated on the double-sided release film. The coating thickness of the slurry of step (2) is 80 μm, and the thickness of the slurry of step (1) is 2 μm.

[0149] (7) Using a laminating machine, laminate the release film from step (6) and the coating from step (5), peel off the release film, and form a sunshade. The laminating temperature is 120°C and the laminating speed is 3 m / min.

[0150] Example 2

[0151] The preparation method of the sunshade curtain of Example 2 is basically the same as that of Example 1, except that in step (4) of Example 2, the second film-forming resin is 65 wt % of acrylic resin, and the second heat-reflecting filler is 5 wt % of nano silver wire.

[0152] Example 3

[0153] The preparation method of the sunshade of Example 3 is basically the same as that of Example 1, except that the elongation at break of 35wt% of the aliphatic yellowing-resistant thermoplastic polyurethane resin in step (2) in Example 3 is 600%, the elastic modulus is 20MPa, and the coating thickness of the weather-resistant layer in step (6) is 30μm.

[0154] Example 4

[0155] The preparation method of the sunshade curtain of Example 4 is basically the same as that of Example 1, except that the first heat-reflecting filler in step (2) of Example 4 is 25 wt% of titanium dioxide and 20 wt% of barium sulfate.

[0156] Example 5

[0157] The preparation method of the sunshade curtain of Example 5 is basically the same as that of Example 1, except that the thickness of the anti-fouling layer in step (6) of Example 5 is 5 μm.

[0158] Comparative Example 1

[0159] The preparation method of the sunshade of Comparative Example 1 is basically the same as that of Example 1, except that the second reflective layer is not provided, that is, step (4) is removed, and in step (5), the slurry in step (3) is only coated on the front side of the knitted polyester fabric.

[0160] Comparative Example 2

[0161] The preparation methods of the sunshade curtains of Comparative Example 2 and Example 1 are basically the same, except that the knitted polyester fabric is not flame-retardant treated and thus fails to meet the flame-retardant requirements.

[0162] Comparative Example 3

[0163] The preparation method of the sunshade of Comparative Example 3 is basically the same as that of Example 1, except that no flame retardant is added to the weather-resistant layer, that is, no halogen-free powder flame retardant is added in step (2).

[0164] Comparative Example 4

[0165] The preparation method of the sunshade of Comparative Example 4 is basically the same as that of Example 1, except that polyurethane (without thermoplastic properties) is selected in the weather-resistant layer, that is, the aliphatic yellowing-resistant thermoplastic polyurethane resin in step (2) of Example 1 is replaced by polyurethane.

[0166] Comparative Example 5

[0167] The preparation method of the sunshade of Comparative Example 5 is basically the same as that of Example 1, except that the thickness of the weather-resistant layer is 10 μm, that is, the thickness of the slurry coated on the front side of the knitted polyester fabric in step (5) is 10 μm.

[0168] Comparative Example 6

[0169] The preparation method of the sunshade of Comparative Example 6 is basically the same as that of Example 1, except that no antifouling layer is provided, that is, step (1) is removed, and only the slurry of step (2) is applied in step (6).

[0170] Table 2 Performance parameters of thermal control skylight sunshade curtains in the embodiment

[0171]

[0172] Table 3 Performance parameters of thermal control skylight sunshade curtains for comparative examples

[0173]

[0174] According to Tables 2 and 3, the solar reflectivity of the sunshade of the embodiment of the present application is between 85% and 90%, the near-infrared reflectivity is ≥85%, the emissivity of the first functional layer is ≥0.9, the emissivity of the second functional layer is ≤0.3, the solar shading rate is 100%, and the UV blocking rate is 100%, thereby increasing the solar emissivity, reducing the solar transmittance and solar absorption rate of the sunroof, effectively blocking the transfer of heat, and reducing the temperature inside the car under direct sunlight.

[0175] According to Example 2 and Example 1, the second heat-reflective filler in the second functional layer is nano silver wire, which changes the emissivity of the top surface of the head.

[0176] According to Example 3 and Example 1, the thickness of the weather-resistant hot-melt layer is 30 μm, which changes the solar reflectivity of the sunshade.

[0177] According to Example 4 and Example 1, the elongation at break and elastic modulus of the resin used in the weather-resistant hot-melt layer are changed, and the combination of heat-reflective fillers is changed, resulting in changes in the solar reflectivity and mechanical properties of the coating.

[0178] According to Example 5 and Example 1, the change in the resin used for the antifouling layer and the setting of the thickness of the antifouling layer to 5 μm lead to changes in the flexibility of the coating and the surface antifouling performance.

[0179] According to Comparative Example 1 and Example 1, without providing the second functional layer, there is no difference in the hemispherical emissivity of the two sides of the sunshade.

[0180] According to Comparative Example 2 and Example 1, the base fabric is not flame-retardant treated and does not meet the flame-retardant requirements.

[0181] According to Comparative Example 3 and Example 1, no flame retardant is added to the weather-resistant hot-melt layer, and the sunshade cannot meet the flame retardant requirements.

[0182] According to Comparative Example 4 and Example 1, the resin in the weather-resistant hot-melt layer is ordinary polyurethane (without thermoplastic properties), and the coating cannot be bonded to the base fabric.

[0183] According to Comparative Example 5 and Example 1, the thickness of the weather-resistant hot-melt layer is set to 10 μm. Since the coating is thin, the solar reflectivity is relatively low.

[0184] In order to further explore the thermal insulation performance of the sunshade of the embodiment of the present application, the thermal performance of the sunshade of the embodiment of the present application and the conventional sunshade were also tested in an outdoor environment. Figure 2 As shown, the size is 300mm×300mm×300mm, and the top opening size is 140mm×240mm, which is used to place sunshades and glass. Figure 3 As shown, the experimental box is built with polystyrene foam insulation board, and the surface is covered with aluminum foil to reduce the radiation heat exchange with the surrounding environment. There are three measuring points in the experimental box, which monitor the box air temperature, the surface temperature under the sunshade, and the surface temperature of the glass. The points are located as shown in the figure. Figure 3 The constructed experimental box was placed outdoors for testing, and the ambient temperature and horizontal solar radiation intensity were recorded simultaneously. Ordinary sunshades, silver-coated cloth, and the sunshades of the embodiment of the present application were placed on the experimental box, and a control group without sunshades was set up.

[0185] Furthermore, a full-scale test chamber (1990mm × 920mm × 690mm) constructed from 100mm-thick polystyrene panels was used to test the installation of the sunshade. The thermal insulation performance of the sunshade according to the present embodiment was compared with that of a conventional sunshade. The experiment was conducted in a sunlight-simulating chamber.

[0186] For outdoor experiments, such as Figure 4-Figure 6 As shown, the meteorological data from 11:00 to 16:00 on the same day were recorded. During this period, the outdoor air temperature was 29.5-31.6°C and the solar radiation level was 435-794W / m2. In the embodiment of this application, the average temperature from 11:00 to 13:00 was used to evaluate the thermal insulation performance of the sunshade under different working conditions. Figure 4 As shown, the highest temperature in the control group was 55.3℃ ( Figure 4 a in the figure), followed by ordinary sunshades at 46.4℃ ( Figure 4 b) of the silver-coated cloth is 43.2°C ( Figure 4 The sunshade in the embodiment of the present application has the lowest temperature of 36.1℃ ( Figure 4d in the figure). Equipped with the sunshade in the embodiment of the present application, the air temperature in the experimental box decreased by 19.2°C, 10.3°C and 7.1°C compared with the control group, ordinary sunshade and silver-coated cloth, respectively. At the same time, the applicant found that the silver-coated cloth had a lower temperature than the ordinary sunshade, and a higher temperature than the thermal control sunshade. This is because the silver-coated cloth transmits part of the sunlight, resulting in a relatively high temperature inside the box. From the temperature curve of the lower surface of the sunshade, as shown in the figure, Figure 5 As shown, the ordinary sunshade has the highest temperature of 74.9℃ ( Figure 5 b), the sunshade in this embodiment is the lowest and 42.5℃ ( Figure 5 The upper surface temperature of ordinary sunshade, silver-coated cloth and thermal control sunshade is reduced by 32.4℃ and 7.6℃ respectively compared with that of ordinary sunshade and silver-coated cloth. Figure 6 As shown in the figure, they are 43℃, 38.4℃ and 37.9℃ respectively. The test results of the full-scale experimental box are shown in the figure. Figure 7 As shown, it can be seen that the air temperature in the box has stabilized after 1.5 hours. The sunshade in the embodiment of the present application can reduce the air temperature in the box by approximately 3.5°C at most. Therefore, the results of outdoor experiments and sunlight simulation chamber experiments show that the sunshade in the embodiment of the present application has a good cooling effect on the internal air, the lower surface of the sunshade, and the upper surface of the glass. The solar reflectivity of the sunshade in the embodiment of the present application is significantly higher than that of other sunshades.

[0187] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. A sunshade curtain, characterized in that: include: Base fabric layer; a first functional layer located on the front surface of the base fabric layer, the first functional layer comprising an optical enhancement layer, a weather-resistant hot-melt layer, and an anti-fouling layer stacked in sequence; a second functional layer located on the back side of the base fabric layer; The second functional layer includes: 30%wt-40wt% of a second film-forming resin, 30wt%-60wt% of a second heat-reflective filler, 0.5wt%-1wt% of a second dispersant, 0-5wt% of a color paste, and 30wt%-60wt% of a second solvent.

2. The sunshade according to claim 1, characterized in that: The emissivity of the second functional layer is less than the emissivity of the first functional layer.

3. The sunshade according to claim 1, characterized in that: The weather-resistant hot-melt layer includes: 15wt%-60wt% of an aliphatic yellowing-resistant thermoplastic polyurethane resin, 35wt%-60wt% of a first heat-reflecting filler, 3wt%-8wt% of a flame retardant, 0.2wt%-1wt% of an anti-hydrolysis stabilizer, 0.2wt%-1wt% of an antioxidant, 1wt%-2wt% of an ultraviolet absorber, 1wt%-2wt% of an ultraviolet stabilizer, 0.5wt%-1wt% of a first dispersant, 0.5wt%-1wt% of a defoaming agent and 10wt%-40wt% of a first solvent.

4. The sunshade according to claim 3, characterized in that: The aliphatic yellowing-resistant thermoplastic polyurethane resin comprises at least one of polyether thermoplastic polyurethane and polyester thermoplastic polyurethane; And / or, the aliphatic yellowing-resistant thermoplastic polyurethane resin has an elongation at break of 500%-1000% and an elastic modulus of ≤20 MPa; And / or, the first heat-reflecting filler comprises: at least one of titanium dioxide, barium sulfate, calcium carbonate and aluminum oxide; And / or, the flame retardant includes: at least one of a phosphorus-nitrogen halogen-free flame retardant and an inorganic hydroxide halogen-free flame retardant; And / or, the anti-hydrolysis stabilizer includes: polycarbodiimide; And / or, the antioxidant comprises: at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate; and / or, the ultraviolet absorber comprises at least one of 2,4-dihydroxybenzophenone-1,3,5-triazine, bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate and 2,4-dihydroxyphenyl-1,3,5-triazine; And / or, the ultraviolet stabilizer includes: at least one of bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly[6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl]-2,2,6,6-tetramethyl-4-piperidinol, and poly[6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl]-2,2,6,6-tetramethyl-4-piperidinol; and / or, the first dispersant and the second dispersant include: at least one of a modified polyurethane dispersant, an acrylic dispersant, and a polyamide dispersant; And / or, the defoaming agent comprises: at least one of: an organosilicon defoaming agent, a mineral oil defoaming agent, a polymer defoaming agent and a fatty acid defoaming agent; and / or, the first solvent and the second solvent include at least one of dimethylformamide, dibasic acid esters, ethyl acetate and butyl acetate, propylene glycol methyl ether acetate, and propylene glycol methyl ether; And / or, the second film-forming resin comprises: at least one of a polyurethane resin and an acrylic resin; And / or, the second heat reflective filler includes at least one of aluminum powder, copper powder, zinc powder, nano silver wire and indium tin oxide powder.

5. The sunshade according to claim 1, characterized in that: The optical enhancement layer includes: 30%wt-40wt% of a third film-forming resin, 0-40wt% of a third heat-reflective filler, 0.5wt%-1wt% of a third dispersant, and 30wt%-60wt% of a third solvent.

6. The sunshade according to claim 5, characterized in that: The third film-forming resin comprises: at least one of polyurethane and acrylic resin; And / or, the third heat-reflecting filler includes: aluminum powder; And / or, the third dispersant includes: at least one of a modified polyurethane dispersant, an acrylic dispersant and a polyamide dispersant; And / or, the third solvent includes at least one of cyclohexanone, ethanol, butyl acetate and butanone.

7. The sunshade according to claim 1, characterized in that: The antifouling layer comprises: 20 wt % to 60 wt % of a fourth film-forming resin and 40 wt % to 80 wt % of a fourth solvent.

8. The sunshade according to claim 7, characterized in that: The fourth film-forming resin comprises at least one of fluorocarbon-modified acrylic acid, silicone-modified acrylic acid, fluorocarbon-modified polyurethane and silicone-modified polyurethane; And / or, the fourth solvent includes at least one of butanone, toluene, acetone, ethanol, and butyl acetate.

9. The sunshade according to any one of claims 1 to 8, characterized in that: The thickness of the base fabric layer is 0.1mm-0.45mm; And / or, the optical enhancement layer has a thickness of 5 μm to 20 μm; and / or, the thickness of the weather-resistant hot-melt layer is 30 μm-100 μm; and / or, the antifouling layer has a thickness of 2 μm to 5 μm; And / or, the thickness of the second functional layer is 3 μm-20 μm.

10. A method for preparing a sunshade according to any one of claims 1 to 9, characterized in that: The method comprises: Coating an optical enhancement layer and a second functional layer on the front and back sides of the base fabric layer respectively; sequentially coating a weather-resistant hot-melt layer and an anti-fouling layer on the surface of the optical enhancement layer away from the base fabric layer; The second functional layer includes: 30%wt-40wt% of a second film-forming resin, 30wt%-60wt% of a second heat-reflective filler, 0.5wt%-1wt% of a second dispersant, 0-5wt% of a color paste and 30wt%-60wt% of a second solvent.

11. A vehicle, characterized in that: The invention comprises the sunshade curtain according to any one of claims 1 to 9, or the sunshade curtain prepared by the preparation method according to claim 10.

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