Composite color liquid crystal polymer radiation film for car window

Abstract

The invention relates to the technical field of radiation films, and particularly discloses a composite color liquid crystal polymer radiation film for a car window, which comprises the following raw materials in parts by mass: 5-30 parts of liquid crystal molecules, 30-60 parts of polymerizable monomers, 0.5-5 parts of an initiator, 0.5-8 parts of interval pears and a polymer network skeleton, the macromolecular network skeleton comprises any one of a gelatin protein film and radioactive silicon dioxide microspheres wrapped by a biomedical macromolecular material; the glue protein film serves as a polymer network framework, iodine labeling is achieved through tyrosine residues on protein and iodine 131, and the tyrosine content accounts for about 2% of the total amino acid content. By increasing the proportion of the polymer network skeleton and the radiation film, a supporting and stable structural frame is provided for liquid crystal molecules, meanwhile, the mechanical property and the processing property of the whole material are affected, and the liquid crystal film can be used for automobile windows, automobile bodies and other parts and has the effects of heat insulation, cooling, energy conservation and heat preservation.

Description

Technical Field

[0001] The present invention relates to the technical field of radiation films, and particularly to a composite color liquid crystal polymer radiation film for vehicle windows. Background Art

[0002] A composite color liquid crystal polymer radiation film is a functional film that combines the characteristics of liquid crystal materials and polymer materials and has specific radiation functions and composite color change characteristics; it has unique optical and physical properties and can change the molecular arrangement under different conditions, thereby affecting behaviors such as the propagation and reflection of light. For example, chiral liquid crystal materials such as cholesteric liquid crystals can selectively reflect visible light of different wavelengths and can present dynamic structural color changes in response to various environmental stimuli changes.

[0003] Currently, due to multiple steps and precise conditions that need to be controlled during the preparation of the composite color liquid crystal polymer radiation film, the preparation difficulty and cost are increased, making large-scale production difficult. At the same time, compared with traditional high-strength engineering materials, the mechanical properties of the composite color liquid crystal polymer radiation film may still not be ideal, and problems such as cracking and deformation may occur when subjected to large external forces or long-term stress. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] The present invention provides a composite color liquid crystal polymer radiation film for vehicle windows, which can solve the problems of difficult-to-control preparation difficulty and poor stress performance of the radiation film. The specific solutions are as follows:

[0006] A composite color liquid crystal polymer radiation film for vehicle windows comprises raw materials with the following mass components:

[0007] Liquid crystal molecules, 5 - 30 parts, polymerizable monomers, 30 - 60 parts, initiator, 0.5 - 5 parts, spacer pears 0.5 - 8 parts, polymer network skeleton, where the polymer network skeleton includes any one of a gelatin protein film and a radioactive silica microsphere wrapped with a biomedical polymer material;

[0008] The gelatin protein film serves as the polymer network skeleton and realizes iodine labeling with iodine - 131 through tyrosine residues on the protein, and the proportion of tyrosine content in the total amino acid content is approximately 2%;

[0009] The mass-volume ratio of silica microspheres to the biomedical polymer material solution is 0.001 - 1000 g : 0.1 - 1000 ml. By adjusting the concentration of the biomedical polymer material solution, the film thickness of the biomedical polymer material on the surface of the radioactive porous silica microspheres can be adjusted.

[0010] Preferably, after preparing the above raw materials, the following steps are further included. S1. Prepolymer mixing: Add liquid crystal molecules, polymerizable monomers, initiators, and spacer particles into a container in a certain proportion, and use a stirring device to fully mix them at a certain temperature and rotation speed to make each component uniformly dispersed and form a homogeneous mixture.

[0011] S2. Curing and forming: Place the prepolymer in a heating device and heat-cure it under certain temperature conditions.

[0012] S3. Annealing treatment: The cured composite color liquid crystal polymer radiation film may have internal stress, and the internal stress can be eliminated through annealing treatment to improve the stability and optical properties of the film.

[0013] S4. Surface treatment: Treat the surface of the film, coat a protective layer, and perform hydrophilic and hydrophobic treatments.

[0014] Preferably, in the S1 step, either a magnetic stirrer or a mechanical stirrer is used. In the initial stage, to preliminarily disperse each component, the stirring speed can be controlled at 200 - 500 revolutions / rpm. As the mixing progresses, to strengthen the dispersion effect, the speed can be increased to 500 - 1000 rpm, and the mixing time is 30 - 60 minutes.

[0015] Preferably, in the S2 step, either an oven or a hot press is selected. According to the size of the film and the production scale, select a device with corresponding space and temperature control accuracy. Carefully transfer the mixed prepolymer containing liquid crystal molecules, polymerizable monomers, initiators, and spacer particles to a suitable mold or carrier substrate. When preparing a thin film, the prepolymer can be evenly coated on a flat glass or metal substrate. Pay attention to controlling the coating thickness to ensure uniformity, and then place the substrate in a heating device, being careful to avoid shaking to prevent uneven distribution of the prepolymer.

[0016] Preferably, in the S2 step, the heating temperature and time are set according to the characteristics of the polymerizable monomers and initiators in the prepolymer. For an acrylate monomer system with benzoyl peroxide as the initiator, the heating temperature is set at 80 - 120 °C. The heating rate can be appropriately increased in the initial heating stage and slowed down when approaching the set temperature. The heating time is usually 10 - 30 minutes. After reaching the set temperature, the holding time is 30 minutes to 2 hours to enable the polymerization reaction to proceed fully.

[0017] Preferably, during the heating and curing process in the step S2, the temperature change is closely monitored, and the temperature display device or external temperature sensor provided by the device can be used for real-time monitoring, and the material state changes, such as color and transparency, are observed at the same time. After the curing is completed, the heating device is turned off, and the material is allowed to cool naturally in the device to near room temperature. The cooling speed should not be too fast to avoid generating internal stress that affects the performance of the film. After cooling, the cured composite film is carefully taken out. If the film is adhered to the substrate, it needs to be separated by a suitable method, such as using a release agent or gently prying.

[0018] Preferably, the composite color liquid crystal polymer radiation film after curing in step S3 may have internal stress, which can be eliminated by annealing to improve the stability and optical properties of the film. The annealing temperature is lower than the curing temperature and the time is 5 to 10 hours.

[0019] Preferably, in the step S4, a suitable protective coating material is selected according to the use environment and requirements of the membrane, and the selected coating material is dissolved in a suitable solvent according to the instructions for use, and necessary additives are added, stirred evenly, and a coating solution with a suitable viscosity is prepared, and the coating solution is evenly coated on the surface of the membrane material by spraying, dipping, scraping, etc.

[0020] Preferably, oven curing is adopted in the S4 step, and the temperature and time are determined according to the characteristics of the coating material, such as curing the silicone resin coating at 150-200°C for 30-60 minutes; ultraviolet curing requires irradiation under ultraviolet lamp of a specific wavelength for a certain time, such as irradiation with ultraviolet lamp of 365nm wavelength for 2-5 minutes.

[0021] Preferably, in step S4, the surface of the membrane material is required to be hydrophilic, and is treated by chemical oxidation, plasma treatment or coating with a hydrophilic polymer. The membrane material is immersed in a solution containing a strong oxidant. The immersion time is determined according to the membrane material and the required degree of hydrophilicity, and the time is 5-30 minutes. After immersion, rinse with a large amount of deionized water to remove residual chemicals.

[0022] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0023] By increasing the ratio between the polymer network skeleton and the radiation film, it provides support and a stable structural framework for the liquid crystal molecules, while also affecting the mechanical properties and processing properties of the entire material. It can be used in car windows, car bodies and other parts to achieve heat insulation, energy saving and heat preservation effects, and improve the fuel efficiency and comfort of the car. At the same time, its good flexibility and optical properties also help to improve the aesthetics and personalization of the car's exterior design.

[0024] The preparation process is relatively flexible and can be processed and formed by a variety of methods, such as solution casting, spin coating, hot pressing, etc. It can be prepared into films of different thicknesses, shapes and sizes to meet the needs of various practical applications; it has good tolerance to many chemical substances and is not easily corroded by chemical substances such as acids, alkalis, and organic solvents. It can still maintain good performance in some harsh chemical environments, thereby broadening its application range.

[0025] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0027] Figure 1 It is a schematic diagram of the operation process of the present invention; DETAILED DESCRIPTION

[0028] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the embodiments of the present invention.

[0029] See also Figure 1 The present invention provides a composite color liquid crystal polymer radiation film for vehicle windows, comprising the following mass components of raw materials:

[0030] Liquid crystal molecules, 5-30 parts, polymerizable monomers, 30-60 parts, initiators, 0.5-5 parts, spacers, 0.5-8 parts, and polymer network skeletons, wherein the polymer network skeletons include any one of gelatin film and radioactive silica microspheres wrapped by biomedical polymer materials;

[0031] The collagen film is used as a polymer network skeleton, and iodine labeling is achieved through tyrosine residues on the protein and iodine 131. The proportion of tyrosine content in the total amino acid content is about 2%;

[0032] The mass volume ratio of silica microspheres and biomedical polymer material solution is 0.001-1000g:0.1-1000ml. The film thickness of the biomedical polymer material on the surface of the radioactive porous silica microspheres is adjusted by adjusting the concentration of the biomedical polymer material solution.

[0033] After preparing the above raw materials, the following steps are further included. S1. Prepolymer mixing: Add liquid crystal molecules, polymerizable monomers, initiators, and spacer particles into a container in a certain proportion, and use a stirring device to fully mix them at a certain temperature and rotation speed, so that each component is uniformly dispersed to form a homogeneous mixture.

[0034] S2. Curing and forming: Place the prepolymer in a heating device and heat-cure it under certain temperature conditions.

[0035] S3. Annealing treatment: There may be internal stress in the cured composite color liquid crystal polymer radiation film. Through annealing treatment, the internal stress can be eliminated, and the stability and optical properties of the film can be improved.

[0036] S4. Surface treatment: Treat the surface of the film, coat a protective layer, and perform hydrophilic and hydrophobic treatments.

[0037] In the S1 step, either a magnetic stirrer or a mechanical stirrer is used. In the initial stage, to preliminarily disperse each component, the stirring speed can be controlled at 200 - 500 revolutions per minute (rpm). As the mixing progresses, to enhance the dispersion effect, the speed can be increased to 500 - 1000 rpm, and the mixing time is 30 - 60 minutes.

[0038] In the S2 step, either an oven or a hot press is selected. According to the size of the film and the production scale, select a device with corresponding space and temperature control accuracy. Carefully transfer the mixed prepolymer containing liquid crystal molecules, polymerizable monomers, initiators, and spacer particles to a suitable mold or carrier substrate. When preparing a thin film, the prepolymer can be uniformly coated on a flat glass or metal substrate. Pay attention to controlling the coating thickness to ensure uniformity. Then place the substrate in a heating device, and pay attention to avoiding shaking to prevent uneven distribution of the prepolymer.

[0039] In the S2 step, set the heating temperature and time according to the characteristics of the polymerizable monomers and initiators in the prepolymer. For an acrylate monomer system with benzoyl peroxide as the initiator, the heating temperature is set at 80 - 120 °C. The heating rate can be appropriately increased in the initial heating stage and slowed down when approaching the set temperature. The heating time is usually 10 - 30 minutes. After reaching the set temperature, the holding time is 30 minutes to 2 hours to enable the polymerization reaction to proceed fully.

[0040] During the heating and curing process in the step S2, the temperature change is closely monitored. The temperature display device or external temperature sensor provided by the equipment can be used for real-time monitoring. At the same time, the material state changes, such as color and transparency, are observed. After the curing is completed, the heating device is turned off and the material is allowed to cool naturally in the equipment to near room temperature. The cooling speed should not be too fast to avoid generating internal stress that affects the performance of the film. After cooling, the cured composite film is carefully removed. If the film is adhered to the substrate, it needs to be separated by a suitable method, such as using a release agent or gently prying.

[0041] The composite color liquid crystal polymer radiation film after curing in step S3 may have internal stress, which can be eliminated by annealing to improve the stability and optical properties of the film. The annealing temperature is lower than the curing temperature and the time is 5 to 10 hours.

[0042] It should be noted that the annealing process includes the following steps:

[0043] Prepare annealing equipment: Choose an oven or heat treatment furnace that can accurately control the temperature, ensure that the equipment has good temperature uniformity, and the fluctuation range is controlled within ±2°C. Choose equipment of appropriate specifications according to the size and output of the film. For example, a small vacuum oven can be used for small-scale laboratory processing, while a large continuous heat treatment furnace is required for industrial production;

[0044] Placing the film: Carefully place the cured composite color liquid crystal polymer radiation film on a bracket or tray in an oven or heat treatment furnace to ensure that the film is flat and avoid folding or curling to prevent stress concentration points. If the film is large, a special clamp or frame can be used to fix it to ensure that it remains stretched during the annealing process;

[0045] Set annealing parameters: Determine the annealing temperature and time based on the composition and performance requirements of the film material. The annealing temperature is set 10-30°C lower than the glass transition temperature (Tg) of the film material. For example, for a film material with a Tg of 150°C, the annealing temperature can be set to 120-140°C. The annealing time is usually 2-10 hours. For thicker films or products with extremely high performance requirements, the annealing time can be appropriately extended;

[0046] Implement annealing: Start the equipment and raise the temperature to the set annealing temperature at a slow heating rate (such as 1-5℃ / minute) to avoid new stress inside the film due to too fast heating. After reaching the annealing temperature, keep the temperature constant for a certain period of time to allow the molecular chains inside the film to fully relax and rearrange. During the annealing process, try to keep the environment inside the equipment stable and avoid fluctuations in temperature, airflow and other factors.

[0047] In the step S4, select a suitable protective coating material according to the usage environment and requirements of the membrane. Dissolve it in an appropriate solvent according to the usage instructions of the selected coating material, add necessary additives, and stir evenly to prepare a coating solution with appropriate viscosity. Then, use methods such as spraying, dipping, or scraping to evenly coat the coating solution on the surface of the membrane material.

[0048] In the step S4, oven curing is adopted, and the temperature and time are determined according to the characteristics of the coating material. For example, the silicone resin coating is cured at 150 - 200 °C for 30 - 60 minutes; for ultraviolet curing, it needs to be irradiated under an ultraviolet lamp with a specific wavelength for a certain time, such as irradiated under a 365 nm wavelength ultraviolet lamp for 2 - 5 minutes.

[0049] In the step S4, the surface of the membrane material needs to be hydrophilic. Any one of the methods of chemical oxidation, plasma treatment, or coating with a hydrophilic polymer can be used for treatment. Immerse the membrane material in a solution containing a strong oxidant, and the immersion time is determined according to the material of the membrane material and the required degree of hydrophilicity, and the time is 5 - 30 minutes. After immersion, rinse it thoroughly with a large amount of deionized water to remove the residual chemical substances.

[0050] The immersion time is determined according to the material of the membrane material and the required degree of hydrophilicity, and is 5 - 30 minutes. After immersion, rinse it thoroughly with a large amount of deionized water to remove the residual chemical substances. For plasma treatment, the membrane material needs to be placed in a plasma treatment device, select appropriate gases (such as oxygen, argon, etc.) and treatment parameters (power, time, etc.), the power is 100 - 500 W, and the treatment time is 1 - 5 minutes. When coating with a hydrophilic polymer, the solution of the hydrophilic polymer (such as polyvinyl alcohol, polyacrylic acid, etc.) can be coated on the surface of the membrane material and then dried and cured;

[0051] To make the surface of the membrane material hydrophobic, it can be achieved by coating a fluorine - or silicon - containing water - repellent. Dilute the water - repellent in an appropriate solvent, and then use methods such as spraying or dipping to coat it on the surface of the membrane material. For example, when using a fluorinated acrylate water - repellent, after coating, bake it at 100 - 150 °C for 15 - 30 minutes to make the water - repellent firmly adhere to the surface of the membrane material, forming a water - repellent layer with low surface energy, and the contact angle can reach more than 120°.

[0052] It should be noted that after the radiation membrane is prepared, its performance detection and quality control are also required, as follows:

[0053] Appearance detection: Under a bright light source, visually observe whether there are defects such as bubbles, impurities, scratches, wrinkles, etc. on the surface of the membrane material. For transparent membrane materials, the light transmission detection method can be adopted. Place the membrane material on a white background and irradiate it with strong light to check whether there are areas with uneven light transmission;

[0054] Thickness Detection: Use a thickness gauge to measure the thickness at different positions of the film material. Measure at least 5 points and calculate the average value and thickness deviation. The thickness deviation of the film material should be controlled within ±5% of the designed thickness to ensure the consistency of the film material performance;

[0055] Optical Performance Detection: Use a spectrophotometer to measure optical parameters such as the light transmittance, reflectance, and absorptance of the film material to ensure that they meet the product design requirements. For film materials with composite color functions, a color difference meter is also required to detect color parameters and evaluate the accuracy and stability of the color;

[0056] Mechanical Performance Detection: Test mechanical performance indicators such as the tensile strength and elongation at break of the film material through a tensile testing machine. During the test, dumbbell-shaped or rectangular specimens are prepared according to the standard method, and a tensile test is carried out at a specified tensile speed, with the tensile speed being 50 - 200 mm / min. At the same time, hardness tests can be conducted, such as using a Shore hardness tester or a pencil hardness tester to detect the surface hardness of the film material;

[0057] Radiation Performance Detection: Use an infrared spectrometer or other professional radiation performance detection equipment to measure radiation performance parameters such as the emissivity and emission intensity of the film material within a specific wavelength range to ensure that it meets the requirements of expected radiative cooling or other radiation-related functions;

[0058] Through the above post-treatment steps, the comprehensive performance of the composite color liquid crystal polymer radiation film can be effectively improved, enabling it to better meet the requirements of various application scenarios.

[0059] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0060] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims, and the above-mentioned drawings of the embodiments of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0061] In the embodiments of the present application, it is not implied that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more unless otherwise specifically and precisely defined.

[0062] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A composite color liquid crystal polymer radiation film for vehicle windows, characterized in that: Raw materials including the following quality components: Liquid crystal molecules, 5-30 parts, polymerizable monomers, 30-60 parts, initiators, 0.5-5 parts, spacers, 0.5-8 parts, and polymer network skeletons, wherein the polymer network skeletons include any one of gelatin film and radioactive silica microspheres wrapped by biomedical polymer materials; The collagen film is used as a polymer network skeleton, and iodine labeling is achieved through tyrosine residues on the protein and iodine 131. The proportion of tyrosine content in the total amino acid content is about 2%; The mass volume ratio of silica microspheres and biomedical polymer material solution is 0.001-1000g:0.1-1000ml. The film thickness of the biomedical polymer material on the surface of the radioactive porous silica microspheres is adjusted by adjusting the concentration of the biomedical polymer material solution.

2. The composite color liquid crystal polymer radiation film for a vehicle window according to claim 1, wherein: After the above raw materials are prepared, the following steps are further included: S1, prepolymer mixing, adding liquid crystal molecules, polymerizable monomers, initiators and spacer particles into a container according to a certain ratio, using a stirring device to fully mix at a certain temperature and speed, so that each component is evenly dispersed to form a uniform mixture; S2, curing and molding, placing the prepolymer in a heating device and heating and curing it under certain temperature conditions; S3, annealing treatment. The solidified composite color liquid crystal polymer radiation film may have internal stress. Annealing treatment can eliminate the internal stress and improve the stability and optical properties of the film. S4, surface treatment, treating the surface of the membrane, coating a protective layer, and performing hydrophilic and hydrophobic treatment.

3. The composite color liquid crystal polymer radiation film for a vehicle window according to claim 2, characterized in that: In the step S1, a magnetic stirrer or a mechanical stirrer is used. In the initial stage, the stirring speed can be controlled at 200-500 rpm to make the components dispersed preliminarily. As the mixing proceeds, the speed can be increased to 500-1000 rpm to enhance the dispersion effect. The mixing time is 30-60 minutes.

4. The composite color liquid crystal polymer radiation film for a vehicle window according to claim 2, wherein: In the step S2, either an oven or a hot press is selected. According to the size of the film and the production scale, a device with corresponding space and temperature control accuracy is selected. The mixed prepolymer containing liquid crystal molecules, polymerizable monomers, initiators and spacer particles is carefully transferred to a suitable mold or a supporting substrate. When preparing a thin film, the prepolymer can be evenly coated on a flat glass or metal substrate. Pay attention to controlling the coating thickness to ensure uniformity. Then put the substrate into the heating device, and be careful to avoid shaking to prevent uneven distribution of the prepolymer.

5. The composite color liquid crystal polymer radiation film for a vehicle window according to claim 4, characterized in that: In the step S2, the heating temperature and time are set according to the characteristics of the polymerizable monomer and the initiator in the prepolymer. For the acrylic ester monomer system with benzoyl peroxide as the initiator, the heating temperature is set at 80-120°C. The heating speed can be appropriately increased in the initial heating stage, and the heating rate is slowed down when approaching the set temperature. The heating time is usually 10-30 minutes. After reaching the set temperature, the insulation time is 30 minutes to 2 hours to allow the polymerization reaction to proceed fully.

6. The composite color liquid crystal polymer radiation film for a vehicle window according to claim 5, characterized in that: During the heating and curing process in step S2, the temperature change is closely monitored. The temperature display device provided by the equipment or the external temperature sensor can be used for real-time monitoring. At the same time, the material state changes, such as color and transparency, are observed. After the curing is completed, the heating device is turned off to allow the material to cool naturally in the equipment to near room temperature. The cooling speed should not be too fast to avoid internal stress that affects the performance of the film. After cooling, carefully remove the cured composite film. If the film is adhered to the substrate, use appropriate methods to separate them, such as using a release agent or gently prying.

7. The composite color liquid crystal polymer radiation film for a vehicle window according to claim 2, wherein: The composite color liquid crystal polymer radiation film after curing in step S3 may have internal stress, which can be eliminated by annealing to improve the stability and optical properties of the film. The annealing temperature is lower than the curing temperature and the time is 5 to 10 hours.

8. The composite color liquid crystal polymer radiation film for a vehicle window according to claim 2, characterized in that: In the step S4, a suitable protective coating material is selected according to the use environment and requirements of the membrane, and the selected coating material is dissolved in a suitable solvent according to the instructions for use, and necessary additives are added, stirred evenly, and a coating solution with a suitable viscosity is prepared, and the coating solution is evenly coated on the surface of the membrane material by spraying, dipping, scraping, etc.

9. A composite color liquid crystal polymer radiation film for a vehicle window according to claim 8, characterized in that: In the step S4, oven curing is adopted, and the temperature and time are determined according to the properties of the coating material, such as the silicone resin coating is cured at 150-200° C. for 30-60 minutes; Ultraviolet curing requires exposure to ultraviolet light of a specific wavelength for a certain period of time, such as 365nm wavelength ultraviolet light for 2-5 minutes.

10. A composite color liquid crystal polymer radiation film for a vehicle window according to claim 8, characterized in that: In the S4 step, the surface of the membrane material needs to be hydrophilic, and is treated by chemical oxidation, plasma treatment or coating with a hydrophilic polymer. The membrane material is immersed in a solution containing a strong oxidant. The immersion time is determined according to the membrane material and the required hydrophilicity, and the time is 5-30 minutes. After immersion, it is rinsed with a large amount of deionized water to remove residual chemicals.

Images