Polarizer protective film and preparation method thereof

Abstract

The invention provides a polaroid protective film and a preparation method thereof, the polaroid protective film comprises a PET base material, an antifouling layer and an adhesive layer are respectively arranged on two sides of the PET base material, the antifouling layer is prepared from an organosilicon-acrylate copolymer, a fluorocarbon polymer, a nanometer titanium dioxide dispersion liquid and the like, does not contain PFAS, and has excellent antifouling performance; the adhesive layer is prepared from an acrylate copolymer, modified starch, a tackifier, a cross-linking agent, a dispersing agent, a plasticizer and the like, does not contain PFAS, has excellent adhesiveness with a PET base material, and also enables the polaroid protective film to have excellent water resistance and flexibility.

Description

Technical Field

[0001] The present invention belongs to the technical field of polarizers, and in particular relates to a polarizer protective film and a preparation method thereof. Background Art

[0002] Polarizers are the core components of liquid crystal displays. Attached to the upper and lower sides of the liquid crystal layer of the liquid crystal glass, they coordinate with the rotation of the liquid crystals to control the passage of light through the panel, achieving the desired display effect. From top to bottom, the polarizer's structure consists of: protective film, upper TAC film, PVA film, lower TAC film, pressure-sensitive adhesive, and release film. The protective film primarily protects the polarizer from damage and contamination during transportation and storage, extending its lifespan. It must be removed during user use.

[0003] In the field of protective films, materials containing per- and polyfluoroalkyl substances (PFAS) are often used to achieve antifouling and good adhesion properties. PFAS are a class of synthetic organofluorine compounds that are widely used in many industrial and consumer products, such as antifouling coatings and adhesives. However, due to their unique chemical properties, such as high chemical stability and surface activity, PFAS are difficult to degrade in the environment and are potentially bioaccumulative and toxic, posing serious risks to human health and the ecological environment.

[0004] Therefore, it is very urgent to develop a PFAS-free protective film. Summary of the Invention

[0005] The object of the present disclosure is to provide a polarizer protective film that does not contain PFAS.

[0006] To achieve the above object, the present disclosure provides a polarizer protective film, comprising a PET substrate, an anti-fouling layer and an adhesive layer are respectively provided on both sides of the PET substrate, wherein:

[0007] The antifouling layer is prepared from the following components in parts by weight:

[0008]

[0009]

[0010] The adhesive layer is prepared from the following components in parts by weight:

[0011]

[0012] As a further improvement of the present application, the fluorocarbon polymer is selected from the model of Daikin Industries, Ltd. The product of TG-2101, the silicone-acrylate copolymer is selected from the product of model KP-574 produced by Shin-Etsu Chemical of Japan, and the nano titanium dioxide dispersion is selected from the product of model TiO2P25 product.

[0013] As a further improvement of the present application, the thickener is at least one of sodium carboxymethyl cellulose and hydroxyethyl cellulose. Preferably, the hydroxyethyl cellulose is selected from the model of Evonik produced in Germany. The product is selected from the product of C 6000P2 or the product of model HEC SE-900 produced by Shin-Etsu Chemical; the sodium carboxymethyl cellulose is selected from the product of model WALOCEL CRT 1000 produced by Dow Chemical.

[0014] As a further improvement of the present application, the antibacterial agent is a silver ion antibacterial agent. Preferably, the silver ion antibacterial agent is a silver ion antibacterial agent produced by Swiss Lonza Group. B5000 products.

[0015] As a further improvement of the present application, the acrylate copolymer is selected from styrene-acrylate copolymer and / or pure acrylic resin.

[0016] As a further improvement of the present application, the styrene-acrylate copolymer is selected from the model of BASF S 760 product, the pure acrylic resin is selected from the model of Arkema 3282 products.

[0017] As a further improvement of the present application, the modified starch is selected from the model of Roquette produced in France. RG 720 products.

[0018] As a further improvement of the present application, the tackifier is a SYLVALITE manufactured by Kraton Corporation of the United States. TM RE 110 products.

[0019] As a further improvement of the present application, the cross-linking agent is an epoxy resin reactive diluent. Preferably, the epoxy resin reactive diluent is a product of model SM-618 produced by Jiangsu Sanmu Group.

[0020] As a further improvement of the present application, the dispersant is an organic phosphate. Preferably, the organic phosphate is produced by INEOS. S's products.

[0021] As a further improvement of the present application, the plasticizer is selected from the model of Pensel produced by Arakawa Chemical of Japan. TMC-100 products.

[0022] To achieve the above objectives, the present application also provides a method for preparing the polarizer protective film described above, comprising the following steps:

[0023] S1. Preparing an antifouling coating composition: adding an organosilicon-acrylate copolymer and a fluorocarbon polymer to a first reaction container, respectively, and stirring uniformly; adding a nano-titanium dioxide dispersion, a thickener, an antibacterial agent, and deionized water in sequence under stirring; and continuing to stir and mix uniformly to obtain an antifouling coating composition;

[0024] S2. evenly coating the antifouling coating composition on one surface of the PET substrate to a thickness of 1 to 5 μm, and drying the coating at 50° C. to 70° C. for 1 to 3 hours to form an antifouling layer;

[0025] S3. Preparing an adhesive composition: adding an acrylate copolymer, modified starch, a tackifier, a crosslinking agent, and a dispersant to a second reaction vessel, stirring uniformly at 30° C. to 50° C., then sequentially adding a plasticizer and deionized water under stirring, and continuing to stir and mix uniformly to obtain an adhesive composition;

[0026] S4. Evenly apply the adhesive composition to the other surface of the PET substrate to a thickness of 2 to 6 μm, and dry it at 60° C. to 80° C. for 2 to 4 hours to form an adhesive layer.

[0027] The beneficial effect of the present application is that the present application designs a polarizer protective film, including a PET substrate and an anti-fouling layer and an adhesive layer respectively arranged on both sides of the PET substrate, wherein: the anti-fouling layer is prepared by using silicone-acrylate copolymer, fluorocarbon polymer, nano titanium dioxide dispersion, etc., does not contain PFAS, and has excellent anti-fouling performance; the adhesive layer is prepared by using acrylate copolymer, modified starch, thickener, cross-linking agent, dispersant, plasticizer, etc., also does not contain PFAS, has excellent adhesion to the PET substrate, and also makes the polarizer protective film have excellent water resistance, flexibility and processability. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present disclosure to clearly and completely describe the technical solutions of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0029] In order to make the above-mentioned objects, features and advantages of the present disclosure more obvious and easy to understand, the present disclosure is further described in detail below in conjunction with specific implementation methods.

[0030] Example 1

[0031] S1. Preparing an antifouling coating composition: adding 30 parts by weight of a fluorocarbon polymer and 40 parts of an organosilicon-acrylate copolymer to a first reaction vessel, stirring uniformly, and sequentially adding 10 parts of a nano-titanium dioxide dispersion, 3 parts of a thickener, 2 parts of a silver ion antibacterial agent, and 15 parts of deionized water under stirring, and continuing stirring for 45 minutes to mix uniformly to obtain an antifouling coating composition;

[0032] S2. evenly coating the antifouling coating composition on one surface of the PET substrate to a coating thickness of 3 μm, and drying at 60° C. for 2 h to form an antifouling layer;

[0033] S3. Preparing an adhesive composition: adding, by weight, 40 parts of styrene-acrylate copolymer, 15 parts of modified starch, 20 parts of a tackifier, 5 parts of a cross-linking agent, and 2 parts of a dispersant to a second reaction vessel, stirring at 40° C. for 55 minutes to mix uniformly, then adding 8 parts of a plasticizer and 10 parts of deionized water in sequence under stirring, and continuing to stir and mix uniformly to obtain an adhesive composition;

[0034] S4. Evenly apply the adhesive composition to the other surface of the PET substrate to a thickness of 4 μm, and dry it at 70° C. for 3 h to form an adhesive layer, thereby obtaining a polarizer protective film.

[0035] In step S1: the fluorocarbon polymer is selected from the model of the product produced by Daikin Industries, Ltd. of Japan. The product of TG-2101, the silicone-acrylate copolymer is selected from the product of Shin-Etsu Chemical of Japan, the model is KP-574, and the nano titanium dioxide dispersion is selected from the product of Evonik of Germany, the model is TiO2P25 product, the thickener is selected from the model produced by Evonik in Germany C 6000P2 product, silver ion antibacterial agent is selected from the model of the Swiss Lonza Group B5000 products.

[0036] In step S3: the styrene-acrylate copolymer is selected from the BASF product S760 products, pure acrylic resin is selected from the model of Arkema The product of 3282, the tackifier is selected from the model SYLVALITE produced by Kraton, USA TM The crosslinking agent is selected from the SM-618 product produced by Jiangsu Sanmu Group, and the dispersant is selected from the INEOS company. S products, plasticizer is selected from the model of Pensel produced by Japan's Arakawa Chemical TMC-100 products.

[0037] Example 2

[0038] The difference between this embodiment and embodiment 1 is that:

[0039] S1. Preparing an antifouling coating composition: adding 20 parts by weight of a fluorocarbon polymer and 30 parts of an organosilicon-acrylate copolymer to a first reaction vessel, stirring uniformly, and sequentially adding 5 parts of a nano-titanium dioxide dispersion, 1 part of a thickener, 1 part of a silver ion antibacterial agent, and 10 parts of deionized water under stirring, and continuing stirring for 30 minutes to mix uniformly to obtain an antifouling coating composition;

[0040] S2. evenly coating the antifouling coating composition on one surface of the PET substrate to a coating thickness of 1 μm, and drying at 50° C. for 1 hour to form an antifouling layer;

[0041] S3. Preparing an adhesive composition: adding, by weight, 30 parts of styrene-acrylate copolymer, 10 parts of modified starch, 15 parts of a tackifier, 3 parts of a cross-linking agent, and 1 part of a dispersant to a second reaction vessel, stirring at 30° C. for 45 minutes to mix uniformly, then adding 5 parts of a plasticizer and 5 parts of deionized water in sequence under stirring, and continuing to stir and mix uniformly to obtain an adhesive composition;

[0042] S4. Evenly apply the adhesive composition to the other surface of the PET substrate to a thickness of 2 μm, and dry it at 60° C. for 2 h to form an adhesive layer, thereby obtaining a polarizer protective film.

[0043] Example 3

[0044] The difference between this embodiment and embodiment 1 is that:

[0045] S1. Preparing an antifouling coating composition: adding 40 parts by weight of a fluorocarbon polymer and 50 parts of an organosilicon-acrylate copolymer to a first reaction vessel, stirring uniformly, and sequentially adding 15 parts of a nano-titanium dioxide dispersion, 5 parts of a thickener, 5 parts of a silver ion antibacterial agent, and 20 parts of deionized water under stirring, and continuing stirring for 60 minutes to mix uniformly to obtain an antifouling coating composition;

[0046] S2. evenly coating the antifouling coating composition on one side of the PET substrate to a coating thickness of 5 μm, and drying at 70° C. for 3 h to form an antifouling layer;

[0047] S3. Preparing an adhesive composition: adding, by weight, 50 parts of styrene-acrylate copolymer, 20 parts of modified starch, 25 parts of a tackifier, 8 parts of a cross-linking agent, and 3 parts of a dispersant to a second reaction vessel, stirring at 50° C. for 60 minutes to mix uniformly, then adding 10 parts of a plasticizer and 15 parts of deionized water in sequence under stirring, and continuing to stir and mix uniformly to obtain an adhesive composition;

[0048] S4. Evenly apply the adhesive composition to the other surface of the PET substrate to a thickness of 6 μm, and dry it at 80° C. for 4 h to form an adhesive layer, thereby obtaining a polarizer protective film.

[0049] Example 4

[0050] The difference between this embodiment and embodiment 1 is that pure acrylic resin is used instead of styrene-acrylate copolymer.

[0051] Example 5

[0052] The difference between this embodiment and embodiment 1 is that the thickener is a product of model HECSE-900 produced by Shin-Etsu Chemical.

[0053] The polarizer protective films prepared in Examples 1-5 were tested for static contact angle, rolling angle, peel strength, and initial adhesion. The test results are shown in Table 1:

[0054] Table 1

[0055]

[0056] The contact angle of traditional polarizer protective films is usually less than 90°, and the rolling angle is generally greater than 10°, which is hydrophilic or weakly hydrophobic; while the contact angle of the polarizer protective film of the present application is 115°, and the rolling angle is less than or equal to 10°. Therefore, the anti-fouling layer surface of the polarizer protective film of the present application has a micro-nano composite structure (such as the bionic lotus leaf effect), which can greatly reduce the adhesion of dust and fingerprints, is suitable for dust-free workshop processing or outdoor display screens, and reduces cleaning costs.

[0057] The peel strength of conventional polarizer protective films ranges from 10 to 50 gf / 25 mm. The adhesive layer of the polarizer protective film of this application has low viscosity, requiring minimal force to remove the polarizer protective film, preventing the adhesive layer (residual adhesive) from damaging the substrate. This makes it suitable for polarizers with brittle PVA layers or coatings.

[0058] The test methods for the above performance indicators are as follows:

[0059] 1. Test method of static contact angle

[0060] Fix the polarizer protective film flat on the sample stage with the antifouling layer on top. Use a microsyringe to add ultrapure water (usually 2-5 μL) on the surface of the antifouling layer. Use a high-speed camera to capture the droplet profile, and the software automatically fits and calculates the contact angle (the average of the left / right contact angles).

[0061] 2. Roll angle test method

[0062] Fix the polarizer protective film horizontally on a tiltable platform with the antifouling layer on top. Add a fixed volume of water (e.g., 10 μL) onto the antifouling layer. Slowly tilt the platform at a speed of 0.1-1° / s and record the critical angle (rolling angle) when the droplet starts to roll.

[0063] 3. Peel strength test method

[0064] Lay the adhesive layer of the polarizer protective film onto a standard steel plate (or glass plate). Roll the film back and forth three times with a 2kg rubber roller to remove any bubbles. Peel the polarizer protective film off at a speed of 300mm / min. Record the average force during the stable phase (excluding the peaks in the first 10mm and at the end).

[0065] The various types of products mentioned in this application have the following clear chemical characteristics:

[0066] Daikin Industries, Ltd. of Japan TG-2101: It is a fluorocarbon polymer. Its chemical structure uses carbon-fluorine chemical bonds as the basic unit to build the main chain. The strong electronegativity of fluorine atoms gives the polymer outstanding chemical stability, low surface energy and excellent weather resistance. From the composition point of view, it is polymerized by carefully formulated fluorine-containing monomers. Usually, in the polymerization system of this product, the main fluorine-containing monomers may involve tetrafluoroethylene (TFE), hexafluoropropylene (HFP), etc. During the polymerization reaction, tetrafluoroethylene, due to its double bond structure, can undergo addition polymerization with other monomers in a specific ratio. In TG-2101, tetrafluoroethylene monomer dominates, accounting for approximately 60%-80%. Its presence contributes to the dense formation of carbon-fluorine chemical bonds in the polymer backbone, a key factor in the product's outstanding chemical stability. Hexafluoropropylene monomer, comprising approximately 10%-30%, modifies the polymer's flexibility and processing properties. The branched chains in the hexafluoropropylene molecular structure disrupt the regularity of the polymer chain, preventing excessive crystallization and thus improving the product's molding and processing characteristics.

[0067] In addition to the main fluorinated monomers, the polymerization system may also contain a small amount (1%-10%) of functional monomers, such as fluorinated monomers with polar groups such as carboxyl and hydroxyl groups. The role of these functional monomers is that when the product is used in some scenarios where it needs to be compounded or modified with other materials, it can react chemically with the active sites on the surface of other materials through these polar groups to enhance the adhesion between the product and other materials. For example, in coating applications, functional monomers containing carboxyl groups can undergo cross-linking reactions with the resin components in the coating, allowing the fluorocarbon polymer to be better dispersed in the coating system, and after film formation, it can be tightly bonded to the substrate, thereby improving the adhesion and durability of the coating.

[0068] This specific ratio of fluorinated monomers is polymerized TG-2101 possesses a unique molecular structure and performance. Its extremely low solubility in organic solvents allows it to maintain its structural integrity in the face of various organic solvent attacks. It exhibits excellent water, oil, and stain resistance. Due to the strong electronegativity of fluorine atoms, the product has an extremely low surface energy. The surface tension of water, oil, and common dirt is higher than its surface energy, making it difficult for them to adhere and spread on its surface. It effectively resists corrosion from various chemicals and maintains stable performance even in harsh environments such as high temperature, high humidity, and strong acids and alkalis. It is widely used in outdoor protection, high-end packaging, and other fields with demanding material performance requirements.

[0069] KP-574, produced by Shin-Etsu Chemical of Japan, is a silicone-acrylate copolymer. Its chemical structure combines the siloxane segments of silicone with the carbon chain structure of acrylate. The silicone portion provides low surface tension, good flexibility, and high and low temperature resistance, while the acrylate portion imparts excellent film-forming properties and mechanical strength. Synthesized through the copolymerization of silicone and acrylate monomers, this copolymer combines the advantages of both. When used as an additive in coatings, inks, and other applications, it can significantly improve product leveling, abrasion resistance, and scratch resistance.

[0070] Produced by Evonik in Germany TiO2 P25: nano titanium dioxide dispersion, its main component is titanium dioxide (TiO2), chemical formula TiO2, molecular weight 79.87, CAS number 13463-67-7. This product is composed of anatase and rutile TiO2 nanoparticles, with an average particle size of about 21nm (TEM), with a range of 35-65nm 2 The TiO2 nanoparticles have a high specific surface area of ​​10000 ppm / g and a high purity of ≥99.5% (calculated as trace metals). In the dispersed system, the TiO2 nanoparticles are evenly dispersed, exhibiting excellent photocatalytic activity, UV shielding properties, and good chemical stability. They can be used in areas such as photocatalytic degradation of pollutants, sunscreen products, and improving the aging resistance of materials.

[0071] Produced by Evonik in Germany C 6000P2: It belongs to hydroxyethyl cellulose, its chemical name is hydroxyethyl cellulose, and its CAS number is 68957-96-0. It has a non-ionic chemical structure and is produced by the etherification reaction of the hydroxyl groups on the cellulose molecules with ethylene oxide. The hydroxyethyl groups in its molecular structure give it good water solubility and can form a uniform colloidal solution in water. This product is a white powder with delayed dissolution characteristics, and has the characteristics of high water retention, thickening, suspension stability and film-forming properties. In different application scenarios such as coatings, adhesives, and cosmetics, it can play a role in adjusting rheological properties and can improve the product's construction performance, such as providing good anti-splash performance. At the same time, it can also enhance the product's storage stability, and has a moderate thickening effect, high gloss and good pigment compatibility.

[0072] HEC SE-900, produced by Shin-Etsu Chemical, is also a hydroxyethyl cellulose, chemically known as hydroxyethyl cellulose (CAS number 68957-96-0). Its chemical structure is non-ionic, formed by an etherification reaction between the hydroxyl groups on the cellulose molecule and ethylene oxide. The hydroxyethyl groups in the molecule impart excellent water solubility, allowing it to form a uniform colloidal solution in water. This product exhibits the typical properties of hydroxyethyl cellulose, including high water retention, thickening, suspension stability, and film-forming properties. When used in coatings, adhesives, cosmetics, and other fields, it can adjust the system's rheological properties, improving the product's application performance and storage stability. In specific product formulations, system performance can be effectively controlled based on its molecular structure and performance parameters.

[0073] Produced by BASF S 760: A styrene-acrylate copolymer, produced through the copolymerization of styrene and acrylate monomers. In its chemical structure, the styrene segments impart rigidity and hardness to the polymer, while the acrylate segments provide flexibility and excellent film-forming properties. This copolymer has a high glass transition temperature and, when used in water-based coatings, adhesives, and other products, forms tough, water-resistant, and scrub-resistant films. It also effectively disperses and stabilizes pigments, effectively enhancing the hiding power and decorative properties of the product.

[0074] Arkema's 3282 is a pure acrylic resin produced through the polymerization of acrylic acid and its ester monomers. Its molecular structure is characterized by a main chain formed by carbon-carbon double bonds and ester groups on the side chains. This structure imparts excellent solubility, film-forming properties, gloss, and weather resistance. In the coatings and ink industries, it forms transparent, hard coatings with excellent chemical resistance. It exhibits excellent adhesion to a variety of substrates, effectively protecting and decorating the surfaces it coats.

[0075] Made in Roquette, France RG 720 is a modified starch, a product chemically modified from natural starch. During the chemical structure modification process, performance optimization is achieved primarily through the introduction of specific functional groups, most commonly hydroxypropyl and carboxymethyl.

[0076] As for hydroxypropyl groups, the usual method of introduction is to allow natural starch molecules to react with propylene oxide in the presence of an alkaline catalyst to undergo an etherification reaction. During this process, the epoxy ring of propylene oxide opens and one end of the epoxy ring combines with the hydroxyl group in the starch molecule, thereby connecting the hydroxypropyl group to the starch skeleton. In RG 720, the degree of substitution of hydroxypropyl groups (i.e., the number of hydroxyl groups substituted per 100 glucose units) is approximately between 0.05 and 0.25. The introduction of an appropriate amount of hydroxypropyl groups can destroy the hydrogen bonding between natural starch molecules. Natural starch has poor solubility in water due to the strong hydrogen bonding between molecules, and the presence of hydroxypropyl groups weakens this effect, making it easier for starch molecules to interact with water molecules, greatly improving the water solubility of starch. At the same time, the steric hindrance effect of hydroxypropyl groups can hinder the recrystallization of starch molecules during the gelatinization process, thereby improving the gelatinization stability and making the starch paste less prone to aging and retrogradation during storage and application.

[0077] The introduction of carboxymethyl groups is achieved by reacting chloroacetic acid with natural starch under alkaline conditions. During the reaction, the carboxymethyl anions in the chloroacetic acid undergo nucleophilic substitution with the hydroxyl groups in the starch molecules, attaching the carboxymethyl groups to the starch molecules. The degree of carboxymethyl substitution in RG 720 is generally between 0.1 and 0.5. Carboxymethyl groups are strongly hydrophilic groups. Their introduction not only further enhances the water solubility of starch but also imparts a negative charge to the starch. In solution, negatively charged starch molecules repel each other, allowing for more even dispersion and effectively improving thickening performance. In emulsified systems, negatively charged starch molecules can adsorb onto the surface of oil droplets, forming a stable charge barrier that prevents oil droplet aggregation and significantly improves emulsion stability.

[0078] SYLVALITE produced by Kraton, USA TM As a tackifier, RE 110's chemical composition mainly includes high-molecular polymers with specific structures. These polymers are polymerized from multiple monomers, laying the material foundation for achieving efficient tackifying effects.

[0079] From the perspective of monomer composition, it contains acrylic ester monomers, such as butyl acrylate, isooctyl acrylate, etc. These acrylic ester monomers, by virtue of the activity of their carbon-carbon double bonds, connect with each other to form the polymer backbone during the polymerization reaction. Taking butyl acrylate as an example, the ester group (-COOC4H9) in its structure has certain steric hindrance and polarity. This structural feature makes the polymer molecular chains have certain flexibility and can interact with other molecules through the ester group. In SYLVALITE TM In RE 110, acrylate monomers account for about 40%-60%. They play a key role in building the polymer backbone and giving the product basic viscosity.

[0080] In addition to acrylic monomers, it also contains styrene monomers, such as styrene itself is a common component. In the polymerization system, the benzene ring structure of the styrene monomer will be introduced into the polymer molecular chain. The benzene ring has a large conjugated system, which increases the rigidity of the polymer molecular chain. At the same time, the benzene ring can produce π-π stacking effect with other molecules, further enhancing the interaction between molecules. TM In the formula of RE 110, the proportion of styrene monomers is approximately 20%-40%. Its presence helps to improve the viscosity strength of the tackifier and its adhesion performance to different materials.

[0081] In addition, in order to further optimize performance, a small amount (5%-15%) of monomers with special functional groups may be introduced into the polymer, such as monomers containing polar functional groups such as hydroxyl (-OH) and carboxyl (-COOH). For monomers containing hydroxyl groups, after the polymerization reaction, the hydroxyl groups will remain on the polymer molecular chain. These hydroxyl groups can form hydrogen bonds with other molecules containing active hydrogen or electronegative atoms, greatly enhancing the intermolecular forces. For example, in an adhesive system, the hydroxyl-containing polymer chain segments can interact with hydroxyl, carboxyl and other groups on the surface of the adhered material through hydrogen bonds, thereby significantly improving the adhesion of the adhesive to the material.

[0082] From the perspective of overall molecular structure, SYLVALITE TMThe polymer formed by RE 110 exhibits a structural characteristic of both linearity and branching. The linear structure allows the molecular chains to align in an orderly manner within the system, facilitating the formation of a continuous viscous network. The branched structure, on the other hand, increases the spatial extension of the molecular chains, enhancing the degree of intermolecular entanglement and further strengthening the intermolecular forces. This unique structure imparts high adhesive strength to the product. In terms of temperature resistance, due to the high bond energy of carbon-carbon bonds and benzene rings in the polymer backbone, the product can withstand certain temperature increases without significant chain breakage or degradation. This results in excellent temperature resistance and maintains a stable viscosity-enhancing effect within the typical operating temperature range of adhesives and sealants (-20°C to 120°C). Regarding moisture resistance, on the one hand, groups such as esters in the polymer molecular chains repel water molecules. On the other hand, even if a small amount of water molecules enter the system, the hydrogen bonds formed between the polar functional groups on the molecular chains and the water molecules are relatively stable, and the presence of water molecules does not significantly weaken the intermolecular interactions, thus ensuring the product's excellent moisture resistance. Add SYLVALITE to adhesives, sealants and other products TM After RE 110, its special chemical composition and molecular structure can fully play its role. Through various interactions such as hydrogen bonds, van der Waals forces and π-π stacking between molecules, it significantly improves the product's adhesion to different materials (such as metals, plastics, rubber, wood, etc.) and enhances the product's bonding strength and durability.

[0083] WALOCEL CRT 1000, produced by Dow Chemical, is sodium carboxymethyl cellulose, also known as sodium carboxymethyl cellulose. It is a sodium salt of the carboxymethyl ether of cellulose. Its chemical structure is an anionic cellulose ether formed by introducing carboxymethyl groups into the cellulose molecular chain. It has good water solubility and can ionize sodium ions in water, giving the molecular chain a negative charge, resulting in high dispersibility and stability. This product has high water retention capacity, and its use in coatings can avoid joints during application and ensure coating uniformity. It also has low surface activity, is non-foaming, and has a retarding effect when the pH value of the system is below 9, facilitating coating production and application.

[0084] Produced by Swiss Lonza Group B5000: This is a silver ion antimicrobial agent whose main active ingredient is silver ions, typically present in the form of complexes or salts. Silver ions are highly oxidizing, capable of destroying the cell membranes of bacteria, fungi, and other microorganisms, disrupting their normal physiological metabolism and thus exerting antibacterial and bactericidal effects. This product exhibits broad-spectrum antimicrobial properties, significantly inhibiting and killing a variety of common Gram-positive and Gram-negative bacteria, as well as fungi. Its long-lasting antimicrobial properties make it suitable for applications in textiles, plastics, coatings, and other fields, providing excellent antimicrobial properties.

[0085] SM-618, produced by Jiangsu Sanmu Group, is a reactive diluent for epoxy resins. Its chemical structure contains reactive functional groups (such as epoxy and hydroxyl groups) that react with epoxy resins. Its main component is a low-molecular-weight compound containing reactive groups. It can reduce the viscosity of epoxy resin systems, improve processing properties, and enhance the resin's wettability and dispersibility for fillers and pigments without affecting the epoxy resin's curing reaction. It also participates in the curing reaction, affecting the properties of the cured product, such as flexibility and mechanical strength.

[0086] Produced by INEOS S: It is an organophosphate, whose chemical structure contains phosphorus-oxygen bonds and organic groups. The phosphorus atoms are connected to different organic groups to form a specific molecular structure, which gives the product a variety of properties.

[0087] Pensel produced by Japan's Arakawa Chemical TM C-100: As a plasticizer, its chemical composition is typically an ester compound, with a long carbon chain and ester functional groups in its molecular structure. Through intermolecular insertion, it weakens the interactions between polymer chains, increasing their flexibility and fluidity, thereby improving the material's plasticity and processing properties. This plasticizer exhibits excellent compatibility, cold resistance, and volatility resistance. When used in industries such as plastics and rubber, it effectively improves the material's flexibility, impact resistance, and low-temperature performance, while not significantly affecting other physical and chemical properties.

[0088] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present disclosure. They are not intended to limit the scope of protection of the present disclosure. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A polarizer protective film, characterized in that: The invention comprises a PET substrate, an antifouling layer and an adhesive layer are respectively provided on both sides of the PET substrate, wherein: The antifouling layer is prepared from the following components in parts by weight: The adhesive layer is prepared from the following components in parts by weight:

2. The polarizer protective film according to claim 1, wherein The fluorocarbon polymer is selected from the model of Daikin Industries, Ltd. The product of TG-2101, the silicone-acrylate copolymer is selected from the product of model KP-574 produced by Shin-Etsu Chemical of Japan, and the nano titanium dioxide dispersion is selected from the product of model TiO2P25 product.

3. The polarizer protective film according to claim 1, wherein: The thickener is at least one of sodium carboxymethyl cellulose and hydroxyethyl cellulose.

4. The polarizer protective film according to claim 3, characterized in that: The hydroxyethyl cellulose is selected from the model of Evonik in Germany. C 6000P2 products or Shin-Etsu Chemical's HEC SE-900 products.

5. The polarizer protective film according to claim 1, wherein: The antibacterial agent is a silver ion antibacterial agent.

6. The polarizer protective film according to claim 1, wherein: The acrylate copolymer is selected from styrene-acrylate copolymer and / or pure acrylic resin.

7. The polarizer protective film according to claim 6, wherein: The styrene-acrylate copolymer is selected from the model of BASF S 760 product, the pure acrylic resin is selected from the model of Arkema 3282 products.

8. The polarizer protective film according to claim 1, wherein The modified starch is selected from the model of Roquette produced in France. RG 720 products.

9. The polarizer protective film according to claim 1, wherein: The tackifier is SYLVALITE produced by Kraton, USA TM RE 110 products.

10. A method for preparing a polarizer protective film according to any one of claims 1 to 9, characterized in that: The steps include: S1. Preparing an antifouling coating composition: adding an organosilicon-acrylate copolymer and a fluorocarbon polymer to a first reaction container, respectively, and stirring uniformly; adding a nano-titanium dioxide dispersion, a thickener, an antibacterial agent, and deionized water in sequence under stirring; and continuing to stir and mix uniformly to obtain an antifouling coating composition; S2. evenly coating the antifouling coating composition on one surface of the PET substrate to a thickness of 1 to 5 μm, and drying the coating at 50° C. to 70° C. for 1 to 3 hours to form an antifouling layer; S3. Preparing an adhesive composition: adding an acrylate copolymer, modified starch, a tackifier, a crosslinking agent, and a dispersant to a second reaction vessel, stirring uniformly at 30° C. to 50° C., then sequentially adding a plasticizer and deionized water under stirring, and continuing to stir and mix uniformly to obtain an adhesive composition; S4. Evenly apply the adhesive composition to the other surface of the PET substrate to a thickness of 2 to 6 μm, and dry it at 60° C. to 80° C. for 2 to 4 hours to form an adhesive layer.

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