A release film for high light transmittance and antistatic OCA and its preparation method

Abstract

This invention relates to a high-transmittance antistatic release film for OCA (Optical Carbon Acrylic Acid) and its preparation method. The release film is prepared by melt blending and biaxial stretching of raw materials including PET masterbatch, an antistatic composition, and polymeric micro / nano fillers. The antistatic composition is a compound of ionic liquid-terminated modified PET-PEG and thiophene-modified aromatic polyamide. The polymeric micro / nano fillers are core-shell microspheres with cross-linked PMMA as the core and a fluoropolymer as the shell. The beneficial effects of this invention are that the antistatic composition, composed of two interwoven polymers, constructs a stable three-dimensional conductive network within the PET film, resulting in more efficient, durable, and stable antistatic performance. The polymeric micro / nano fillers have a refractive index similar to that of the PET matrix, ensuring high light transmittance while providing effective anchoring points, thereby improving the adhesion and uniformity of the release agent layer, forming a smooth release film, and improving processability.

Description

Technical Field

[0001] This invention relates to the field of polyester film technology, specifically to a release film for high-transmittance antistatic OCA and its preparation method. Background Technology

[0002] OCA optical adhesive is an optically transparent adhesive used for bonding transparent optical components. It features a substrate-free, double-sided lamination tape structure and is laminated using a release film. The main function of the OCA release film is to protect the optical adhesive layer, achieve stable peeling, and ensure cleanliness and light transmittance during the lamination process. Release films typically consist of a base film and a release agent. Currently, most optimization solutions for OCA optical adhesive release films on the market focus on the release agent, but the quality of the base film also affects the final performance of the release film.

[0003] The base film layer typically uses PET (polyethylene terephthalate) film as the substrate, requiring the PET film to have low surface roughness, a certain degree of anti-sticking properties, and a smooth surface. To meet these high-performance requirements, current modification techniques for polyester films include adding nano- or micro-sized inorganic particles, such as silica and calcium carbonate, to the surface to reduce surface roughness; or coating the film surface with a coating containing micro-sized particles to improve surface tension. However, existing technical solutions for polyester films still have shortcomings. Adding inorganic particles requires controlling their size and amount, and the resulting surface roughness still cannot meet the requirement of Ra≤15nm. Furthermore, inorganic particles are prone to agglomeration, leading to decreased processing performance. While coating can improve surface tension, the coating solution usually contains small-molecule organic components, which are prone to precipitation during subsequent processing. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention prepares a high-transmittance antistatic PET film by adding an antistatic agent composition and polymeric micro / nano fillers to PET masterbatch and using a simple process.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for preparing a release film for high-transmittance antistatic OCA includes the following steps:

[0007] S1. Weigh and measure the PET masterbatch, antistatic composition, and polymer micro / nano filler, place them in a high-speed mixer and mix, then dry them under vacuum.

[0008] S2. The dried material is fed into a single screw extruder, and the extrusion temperature is set to 255~265℃. The molten material is extruded through the die and rapidly cooled on the cooling roller to form a cast sheet.

[0009] S3. Preheat the cast sheet at 75~85℃, and then stretch it longitudinally at 95~105℃ with a stretching ratio of 2.8~3.2 times; preheat the longitudinally stretched film at 100~110℃, and then stretch it transversely at 115~125℃ with a stretching ratio of 3.2~3.5 times.

[0010] S4. The biaxially stretched film is heat-set at 200~220℃, and the heat-set film surface is corona treated; after cooling and trimming, it is wound up to obtain the high light transmittance antistatic OCA release film base film.

[0011] The antistatic composition is prepared by compounding modified PET-PEG and thiophene-modified aromatic polyamide in a mass ratio of 5~8:2~5; the modified PET-PEG is obtained by polycondensation of dimethyl terephthalate, polyethylene glycol and ethylene glycol and then end-capping with ionic liquid.

[0012] The polymeric micro / nano filler is a core-shell microsphere with cross-linked PMMA as the core and a fluoropolymer as the shell.

[0013] Further, in step S1, the mass ratio of PET masterbatch, antistatic composition and polymer micro / nano filler is 100:3~8:5~15.

[0014] Furthermore, the preparation process of the modified PET-PEG is as follows:

[0015] 1) Add dimethyl terephthalate, polyethylene glycol, ethylene glycol and tetrabutyl titanate catalyst to a reactor equipped with a stirrer, a water separator and a nitrogen inlet pipe.

[0016] 2) Under nitrogen protection, the transesterification reaction was carried out at 180~200℃; then the temperature was raised to 250~270℃, the vacuum was reduced to <100 Pa, and the polycondensation reaction was carried out for 1.5 hours.

[0017] 3) Remove the vacuum, add 1-carboxymethyl-3-methylimidazolium tetrafluoroborate ionic liquid to the system, and react at atmospheric pressure and 180°C for 1-3 hours to perform end-capping.

[0018] Furthermore, the raw materials used in the preparation of the modified PET-PEG are in the following weight proportions: 100 parts dimethyl terephthalate, 20-40 parts polyethylene glycol, 40-60 parts ethylene glycol, 0.3 parts tetrabutyl titanate catalyst, and 5-10 parts 1-carboxymethyl-3-methylimidazolium tetrafluoroborate ionic liquid.

[0019] Furthermore, the thiophene-modified aromatic polyamide is prepared by polycondensation of 5-bromoisophthalic acid, aliphatic dicarboxylic acid, siloxane diamine monomer, and aliphatic diamine as raw materials, followed by ethanolamine as a capping agent, and then by a Suzuki coupling reaction with a thiophene borate ester derivative.

[0020] Further, the aliphatic dicarboxylic acid is selected from one of succinic acid, adipic acid, pimelic acid, glutaric acid, and malonic acid; the siloxane-containing diamine monomer is aminopropyl-terminated polydimethylsiloxane with a molecular weight of 400-1000; the aliphatic diamine is selected from one of 1,2-diamino-2-methylpropane, 2,5-dimethyl-2,5-hexanediamine, dimethylpropanediamine, and hexamethylenediamine.

[0021] Furthermore, the molar ratio of 5-bromoisophthalic acid, aliphatic dicarboxylic acid, siloxane diamine monomer, aliphatic diamine, and thiophene borate derivative is 3:2:1:4:3.

[0022] Furthermore, the preparation process of the polymer micro / nano filler is as follows:

[0023] 1) Add deionized water, emulsifier, and sodium bicarbonate to the reaction flask, turn on the stirrer and introduce nitrogen gas, and heat to 70°C; slowly add methyl methacrylate, ethylene glycol dimethacrylate, and benzoyl peroxide to the reaction flask after mixing. After the addition is complete, keep the reaction at the temperature for 5-6 hours; after the reaction is complete, cool to room temperature, filter and collect the solid, wash with anhydrous ethanol and dry under vacuum to obtain seed microspheres;

[0024] 2) Disperse the seed microspheres in deionized water, add OP-10 and stir to form a uniform seed emulsion; add methyl methacrylate, dodecyl fluoroheptyl methacrylate, divinylbenzene, sodium dodecylbenzene sulfonate and deionized water in another container, and emulsify by high-speed shearing to form a stable pre-emulsion.

[0025] 3) Transfer the seed emulsion to a four-necked flask and heat it to 75-80°C. Slowly add the pre-emulsion and 1% potassium persulfate aqueous solution to the flask through two constant pressure dropping funnels. After the addition is complete, continue to keep the temperature for 2 hours.

[0026] 4) After the reaction is complete, cool to room temperature, add 5% aluminum chloride aqueous solution to the emulsion to break the emulsion, and wash repeatedly with hot water, filter, and dry to obtain the final product.

[0027] Furthermore, the raw materials in the seed emulsion are, by weight, 10 parts seed microspheres, 148 parts deionized water, and 2 parts OP-10; the raw materials in the pre-emulsion are, by weight, 5 parts methyl methacrylate, 15 parts dodecylfluoroheptyl methacrylate, 0.5 parts divinylbenzene, 1 part sodium dodecylbenzenesulfonate, and 50 parts deionized water; and 5 parts of 1% potassium persulfate aqueous solution are used.

[0028] The present invention further provides a release film for high light transmittance and antistatic OCA prepared according to the preparation method described above.

[0029] In this application, the antistatic agent composition is directly added to the melt extrusion process, eliminating the antistatic coating step. This not only simplifies the process and reduces costs but also solves potential adhesion and durability issues with the coating. The antistatic composition consists of ionic liquid-terminated PET-PEG and thiophene-modified aromatic polyamide, a complex system of organic polymers that conduct electricity through both ionization and electrons. Aromatic polyamide possesses excellent mechanical and heat resistance properties, and its main chain structure is highly compatible with PET. The thiophene structure modified at its active sites allows its π-π conjugated structure to conduct static charge through electronic transitions, forming an "electronic conductive pathway" with stable performance. Furthermore, the ionic liquid-terminated PET-PEG has the same main chain structure as the PET matrix material, ensuring uniform nanoscale dispersion of the two antistatic agent compositions within the PET matrix and avoiding performance inconsistencies caused by phase separation. In the film, these two polymers intertwine to construct a stable three-dimensional conductive network, resulting in more efficient, durable, and stable antistatic performance.

[0030] Core-shell microspheres, with cross-linked PMMA as the core and fluoropolymer as the shell, are added to PET substrates as polymeric micro / nano fillers. Because PMMA and PET substrates have matching refractive indices, the film's high light transmittance and low haze remain unaffected. The core-shell microspheres also act as penetration anchors for release agents, ensuring effective adhesion of the release agent to the film surface. Furthermore, the low surface area of ​​the microsphere shells promotes a smoother and more uniform release of release force during peeling.

[0031] Compared with existing technologies, the beneficial effects of this invention are as follows: The antistatic composition consists of two interwoven polymers, constructing a stable three-dimensional conductive network within the PET film, resulting in more efficient, durable, and stable antistatic performance. The polymeric micro / nano fillers have a refractive index similar to the PET matrix, ensuring high light transmittance while forming a uniform, fine, microscopic protrusion structure on the film surface. This provides effective anchoring points for subsequent release agent coating, thereby improving the adhesion and uniformity of the release agent layer, forming a smooth release film, and enhancing processability. The single-layer extrusion process enables ultra-thin films while simplifying the production process and significantly reducing production costs. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Raw material sources: Most of the raw materials used in this application are conventional chemical reagents that can be purchased on the market. Some of the raw materials are sourced as follows.

[0035]

[0036] Example: A release film for high-transmittance, antistatic OCA

[0037] S1. Weigh 100 parts by weight of PET masterbatch, 3-8 parts by weight of antistatic composition, and 5-15 parts by weight of polymer micro / nano filler and mix them in a high-speed mixer, then dry them under vacuum.

[0038] S2. The dried material is fed into a single screw extruder, and the extrusion temperature is set to 255~265℃. The molten material is extruded through the die and rapidly cooled on the cooling roller to form a cast sheet.

[0039] S3. Preheat the cast sheet at 75~85℃, and then stretch it longitudinally at 95~105℃ with a stretching ratio of 2.8~3.2 times; preheat the longitudinally stretched film at 100~110℃, and then stretch it transversely at 115~125℃ with a stretching ratio of 3.2~3.5 times.

[0040] S4. The biaxially stretched film is heat-set at 200~220℃, and the heat-set film surface is corona treated; after cooling and trimming, it is wound up to obtain the high light transmittance antistatic OCA release film base film.

[0041] The antistatic composition is prepared by compounding modified PET-PEG and thiophene-modified aromatic polyamide in a mass ratio of 5~8:2~5.

[0042] The preparation process of the modified PET-PEG is as follows:

[0043] 1) In a reactor equipped with a stirrer, a water separator and a nitrogen inlet pipe, add 100 parts by weight of dimethyl terephthalate, 30 parts by weight of polyethylene glycol (PEG-4000), 50 parts by weight of ethylene glycol and 0.3 parts by weight of tetrabutyl titanate catalyst.

[0044] 2) Under nitrogen protection, the transesterification reaction was carried out at 180~200℃; then the temperature was raised to 250~270℃, the vacuum was reduced to <100 Pa, and the polycondensation reaction was carried out for 1.5 hours.

[0045] 3) Remove the vacuum, add 8 parts by weight of 1-carboxymethyl-3-methylimidazolium tetrafluoroborate ionic liquid to the system, react at atmospheric pressure and 180°C for 3 hours, and then seal the end.

[0046] The preparation process of the thiophene-modified aromatic polyamide is as follows:

[0047] Using 5-bromoisophthalic acid, succinic acid, aminopropyl-terminated polydimethylsiloxane (1000), and hexamethylenediamine as raw materials, each raw material was weighed in a molar ratio of 3:2:1:4. 5-bromoisophthalic acid and succinic acid were pre-mixed and dissolved in toluene, and nitrogen gas was introduced. Then, hexamethylenediamine was added dropwise under mechanical stirring, and the mixture was refluxed for 3 hours after the addition was completed. Then, a toluene dilution containing aminopropyl-terminated polydimethylsiloxane was added dropwise, and the mixture was refluxed for another 2 hours after the addition was completed. Finally, 1 wt% of ethanolamine (based on the total monomer mass) was added and reacted for 1.5 hours. The resulting mixture was precipitated and washed with acetone and water, and then dried.

[0048] The dried product was dissolved in DMF with 3-thiophene borate pinacol ester (molar amount three times that of 5-bromoisophthalic acid) and tetrakis(triphenylphosphine)palladium catalyst, and reacted at 100 °C for 24 h. After the reaction was completed, the product was precipitated in methanol, filtered, washed successively with methanol and water, and dried under vacuum to obtain thiophene-modified aromatic polyamide.

[0049] The preparation process of the polymer micro / nano filler is as follows:

[0050] 1) Add 200 parts of deionized water, 5 parts of sodium dodecyl sulfonate emulsifier, and 0.5 parts of sodium bicarbonate to a reaction flask, start stirring and introduce nitrogen gas, and heat to 70°C; slowly add 95 parts of methyl methacrylate, 5 parts of ethylene glycol dimethacrylate, and 0.5 parts of benzoyl peroxide to the reaction flask after mixing. After the addition is complete, keep the reaction at this temperature for 6 hours; after the reaction is complete, cool to room temperature, filter and collect the solid, wash with anhydrous ethanol and dry under vacuum to obtain seed microspheres;

[0051] 2) Add 10 parts of seed microsphere dispersion to 148 parts of deionized water, add 2 parts of OP-10 and stir to form a uniform seed emulsion; add 5 parts of methyl methacrylate, 15 parts of dodecylfluoroheptyl methacrylate, 0.5 parts of divinylbenzene, 1 part of sodium dodecylbenzenesulfonate and 50 parts of deionized water to another container, and emulsify at high speed to form a stable pre-emulsion.

[0052] 3) Transfer the seed emulsion to a four-necked flask and heat it to 78°C. Slowly add the pre-emulsion and 1% potassium persulfate aqueous solution to the flask through two constant pressure dropping funnels. After the addition is complete, continue to keep the temperature for 2 hours.

[0053] 4) After the reaction is complete, cool to room temperature, add 5% aluminum chloride aqueous solution to the emulsion to break the emulsion, and wash repeatedly with hot water, filter, and dry to obtain the final product.

[0054] Example 1: A release film for high-transmittance, antistatic OCA

[0055] S1. Weigh 100 parts by weight of PET masterbatch, 3 parts by weight of antistatic composition, and 5 parts by weight of polymer micro / nano filler and mix them in a high-speed mixer, then dry them under vacuum.

[0056] S2. The dried material is fed into a single screw extruder, and the extrusion temperature is set to 255℃. The molten material is extruded through the die and rapidly cooled on the cooling roller to form a cast sheet.

[0057] S3. Preheat the cast sheet at 75°C, then stretch it longitudinally at 100°C with a stretching ratio of 2.8 times; preheat the longitudinally stretched film at 105°C, then stretch it transversely at 115°C with a stretching ratio of 3.2 times.

[0058] S4. The biaxially stretched film is heat-set at 210°C, and the heat-set film surface is corona treated. After cooling and trimming, it is wound up to obtain the high-transmittance antistatic OCA release film base film.

[0059] Example 2: A release film for high-transmittance, antistatic OCA

[0060] S1. Weigh 100 parts by weight of PET masterbatch, 5 parts by weight of antistatic composition, and 10 parts by weight of polymer micro / nano filler and mix them in a high-speed mixer, then dry them under vacuum.

[0061] S2. The dried material is fed into a single screw extruder, and the extrusion temperature is set to 260℃. The molten material is extruded through the die and rapidly cooled on the cooling roller to form a cast sheet.

[0062] S3. Preheat the cast sheet at 80°C, then stretch it longitudinally at 100°C with a stretching ratio of 3.0 times; preheat the longitudinally stretched film at 110°C, then stretch it transversely at 120°C with a stretching ratio of 3.4 times.

[0063] S4. The biaxially stretched film is heat-set at 210°C, and the heat-set film surface is corona treated. After cooling and trimming, it is wound up to obtain the high-transmittance antistatic OCA release film base film.

[0064] Example 3: A release film for high-transmittance, antistatic OCA

[0065] S1. Weigh 100 parts by weight of PET masterbatch, 8 parts by weight of antistatic composition, and 15 parts by weight of polymer micro / nano filler and mix them in a high-speed mixer, then dry them under vacuum.

[0066] S2. The dried material is fed into a single screw extruder, and the extrusion temperature is set to 265℃. The molten material is extruded through the die and rapidly cooled on the cooling roller to form a cast sheet.

[0067] S3. Preheat the cast sheet at 85°C, then stretch it longitudinally at 105°C with a stretching ratio of 3.2 times; preheat the longitudinally stretched film at 110°C, then stretch it transversely at 125°C with a stretching ratio of 3.5 times.

[0068] S4. The biaxially stretched film is heat-set at 220°C, and the heat-set film surface is corona treated. After cooling and trimming, it is wound up to obtain the high-transmittance antistatic OCA release film base film.

[0069] Comparative Example 1: A release film for high-transmittance antistatic OCA

[0070] S1. Weigh 100 parts by weight of PET masterbatch, 8 parts by weight of modified PET-PEG, and 15 parts by weight of polymer micro / nano filler and mix them in a high-speed mixer, then dry them under vacuum.

[0071] S2. The dried material is fed into a single screw extruder, and the extrusion temperature is set to 265℃. The molten material is extruded through the die and rapidly cooled on the cooling roller to form a cast sheet.

[0072] S3. Preheat the cast sheet at 85°C, then stretch it longitudinally at 105°C with a stretching ratio of 3.2 times; preheat the longitudinally stretched film at 110°C, then stretch it transversely at 125°C with a stretching ratio of 3.5 times.

[0073] S4. The biaxially stretched film is heat-set at 220°C, and the heat-set film surface is corona treated. After cooling and trimming, it is wound up to obtain the base film.

[0074] Comparative Example 2: A release film for high-transmittance antistatic OCA

[0075] S1. Weigh 100 parts by weight of PET masterbatch, 8 parts by weight of modified PET-PEG, and 15 parts by weight of PMMA seed microspheres and mix them in a high-speed mixer, then dry them under vacuum.

[0076] S2. The dried material is fed into a single screw extruder, and the extrusion temperature is set to 265℃. The molten material is extruded through the die and rapidly cooled on the cooling roller to form a cast sheet.

[0077] S3. Preheat the cast sheet at 85°C, then stretch it longitudinally at 105°C with a stretching ratio of 3.2 times; preheat the longitudinally stretched film at 110°C, then stretch it transversely at 125°C with a stretching ratio of 3.5 times.

[0078] S4. The biaxially stretched film is heat-set at 220°C, and the heat-set film surface is corona treated. After cooling and trimming, it is wound up to obtain the base film.

[0079] The surface roughness, surface resistance, light transmittance, and haze of the base films prepared in Examples 1-3 and Comparative Examples 1 and 2 were tested.

[0080] The base film prepared above was coated with release agent offline to prepare a release film for MLCCs (GB / T25256-2010). The release force was tested, and the results are recorded in Table 1.

[0081] Table 1

[0082]

[0083] As shown in Table 1, compared with pure PET film, the modified PET base film prepared in this application shows a significant decreasing trend in both roughness and haze. Due to the addition of antistatic agent composition, the film has antistatic properties. Due to the addition of polymer micro-nano fillers, the surface of the base film is more conducive to the formation of a stable and firm coating by the release agent, and the residual adhesion has increased significantly.

[0084] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details.

Claims

1. A method for preparing a release base film for high-transmittance antistatic OCA, characterized by, It comprises the following steps: S1, weigh the measured PET master batch, antistatic composition, and high polymer micro-nano filler, mix them in a high-speed mixer, and then dry them under vacuum drying; S2, send the dried materials into a single screw extruder, set the extrusion temperature to 255-265 DEG C, melt the materials, extrude them through a die, and quickly cool them on a cooling roller to form a cast sheet; S3, preheat the cast sheet at 75-85 DEG C, then longitudinally stretch it at 95-105 DEG C with a stretch ratio of 2.8-3.2 times, preheat the longitudinally stretched film at 100-110 DEG C, and then transversely stretch it at 115-125 DEG C with a stretch ratio of 3.2-3.5 times; S4, heat set the film after bidirectional stretching at 200-220 DEG C, and perform corona treatment on the surface of the heat set film; After cooling and edge cutting, the high-transmittance antistatic OCA release film base film is obtained by winding. The antistatic composition is compounded from modified PET-PEG and thienyl-modified aromatic polyamide at a mass ratio of 5-8:2-5; the modified PET-PEG is obtained by using ionic liquid to cap after polycondensation of dimethyl terephthalate, polyethylene glycol, and ethylene glycol; The high polymer micro-nano filler is a core-shell microsphere with cross-linked PMMA as the core and fluorine-containing polymer as the shell.

2. The method of claim 1, wherein the high-transmittance anti-static OCA release base film is prepared by coating a base film with a primer layer, a first adhesive layer, a second adhesive layer, and a third adhesive layer in this order. In step S1, the mass ratio of PET master batch, antistatic composition, and high polymer micro-nano filler is 100:3-8:5-15.

3. The method of claim 1, wherein the high-transmittance anti-static OCA release base film is prepared by coating a release layer on a base film, and coating an anti-static layer on the release layer. The preparation process of the modified PET-PEG is as follows: 1) Add dimethyl terephthalate, polyethylene glycol, ethylene glycol, and tetrabutyl titanate catalyst into a reactor equipped with a stirrer, water separator, and nitrogen inlet pipe; 2) Perform ester exchange reaction at 180-200 DEG C under nitrogen protection; then increase the temperature to 250-270 DEG C, reduce the vacuum degree to <100 Pa, and perform polycondensation reaction for 1.5 hours; 3) Remove the vacuum, add 1-carboxymethyl-3-methyl imidazole tetrafluoroborate ionic liquid into the system, and perform capping reaction at normal pressure and 180 DEG C for 1-3 hours.

4. The method of claim 3, wherein the method is characterized by, The weight fractions of raw materials in the preparation process of the modified PET-PEG are as follows: dimethyl terephthalate 100 parts, polyethylene glycol 20-40 parts, ethylene glycol 40-60 parts, tetrabutyl titanate catalyst 0.3 parts, and 1-carboxymethyl-3-methyl imidazole tetrafluoroborate ionic liquid 5-10 parts.

5. The method of claim 1, wherein the high-transmittance anti-static OCA release base film is prepared by coating a release layer on a base film, and coating an anti-static layer on the release layer. The thienyl-modified aromatic polyamide is prepared by using 5-bromoisophthalic acid, aliphatic dibasic acid, siloxane-containing diamine monomer, and aliphatic diamine as raw materials, using ethanolamine as a capping agent to prepare aromatic polyamide, and then performing Suzuki coupling reaction with thienyl borate derivative.

6. The method of claim 5, wherein the high-transmittance anti-static OCA release base film is prepared by coating a release layer on a base film, and coating an anti-static layer on the release layer. The aliphatic dibasic acid is selected from one of succinic acid, adipic acid, pimelic acid, glutaric acid, and malonic acid; the siloxane-containing diamine monomer is aminopropyl-terminated polydimethylsiloxane with a molecular weight of 400-1000; and the aliphatic diamine is selected from one of 1,2-diamino-2-methylpropane, 2,5-dimethyl-2,5-hexanediamine, dimethylpropylene diamine, and hexamethylene diamine.

7. The method of claim 5, wherein the method is characterized by, The molar ratio of the 5-bromoisophthalic acid, the aliphatic dibasic acid, the siloxane-containing diamine monomer, the aliphatic diamine, and the thiophene borate derivative is 3:2:1:4:

3.

8. The method of claim 1, wherein the method is characterized by: The preparation process of the high polymer micro-nano filler is as follows: 1) Add deionized water, emulsifier, and sodium bicarbonate into a reaction bottle, start stirring and pass nitrogen, and heat to 70℃; mix methyl methacrylate, ethylene glycol dimethacrylate, and benzoyl peroxide, and then slowly add them into the reaction bottle, after the dropwise addition is completed, keep the reaction for 5-6h; after the reaction is completed, cool to room temperature, collect the solid by filtration, rinse with anhydrous ethanol, and then vacuum dry to obtain seed microspheres; 2) Disperse the seed microsphere dispersion in deionized water, add OP-10 and stir to form a uniform seed emulsion; in another container, add methyl methacrylate, dodecafluoroheptyl methacrylate, divinylbenzene, sodium dodecylbenzenesulfonate, and deionized water, and high-speed shear emulsify to form a stable pre-emulsion; 3) Transfer the seed emulsion to a four-necked flask, and heat to 75-80℃, slowly add the pre-emulsion and 1% potassium persulfate aqueous solution into the flask through two constant-pressure dropping funnels, after the dropwise addition is completed, continue to keep the reaction for 2h; 4) After the reaction is completed, cool to room temperature, add 5% aluminum chloride aqueous solution to the emulsion to break the emulsion, and then repeatedly wash with hot water, filter, and dry to obtain the product.

9. The method of claim 8, wherein the method is characterized by, The dosages of the raw materials in the seed emulsion are 10 parts of seed microspheres, 148 parts of deionized water, and 2 parts of OP-10 by weight; the dosages of the raw materials in the pre-emulsion are 5 parts of methyl methacrylate, 15 parts of dodecafluoroheptyl methacrylate, 0.5 parts of divinylbenzene, 1 part of sodium dodecylbenzenesulfonate, and 50 parts of deionized water by weight; and the dosage of 1% potassium persulfate aqueous solution is 5 parts.

10. A release base film for high-transmittance antistatic OCA prepared by the preparation method according to any one of claims 1-9.

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