A vertical partition gradient light transmittance automobile side window dimming film and a preparation method thereof

Abstract

The application discloses a kind of vertical partition gradient light transmittance's car side window dimming film and preparation method thereof, belong to car dimming film technical field.The dimming film includes partition electrode substrate, common electrode substrate and the conductive glue for connection and circuit controller, the present application is aimed at traditional horizontal partition scheme side edge wiring space limited, poor sealing reliability, and the technical problem that the specific liquid crystal gravity long-range settlement of vertical partition causes transmittance-voltage curve irreversible shift, through the integrated design of conductive framework-polymer wall-liquid crystal anchoring, fundamentally blocks the liquid crystal convection and dye macroscopic settlement induced by gravity or vibration, while realizing low resistance, high flexibility and long-term service stability, meet the batch manufacturing needs of curved surface car side window.

Description

Technical Field

[0001] This invention relates to the field of automotive side window dimming film technology, and more particularly to an automotive side window dimming film with vertically zoned gradient light transmittance and its preparation method. Background Technology

[0002] Currently, in the field of automotive side window dimming films, the industry generally adopts a horizontal partitioning scheme that divides the side window into multiple horizontal strips along the height direction. In this scheme, the lead wires of the independent electrodes of each partition need to be arranged along the vertical edge of the side window and run a long distance to the bottom; however, the available width of the side area is usually narrow, forcing the use of extremely thin line widths to avoid obstructing the visible area, which leads to a chain of problems such as increased circuit resistance, attenuation of driving voltage, and dimming response distortion; at the same time, the side lead wires need to penetrate the window seals, which are subject to the risk of moisture corrosion during long-term use, and the flexible circuit board is also accelerated to wear due to repeated bending during the raising and lowering of the window.

[0003] If the partition direction is rotated 90 degrees to form vertical independent strips arranged along the width of the window, and all partition electrodes and common electrodes are gathered at the lower edge of the window, then the ample space at the bottom can be used to achieve wide line width, short path, and low resistance wiring. The bottom lead-out can be completely hidden in the door panel cavity, without occupying visible area, and the sealing structure is simple and has no wear on moving parts. However, while vertical partitioning brings the above-mentioned integrated advantages, it introduces core technical challenges that horizontal partitioning has never faced: each vertical partition is a vertical strip, which can be hundreds of millimeters high. The liquid crystal has an open channel in the direction of gravity that is more than ten times shorter than the short side of the horizontal partition. When placed vertically for a long time or under the vibration of vehicle driving, the nematic liquid crystal body and the dihedral dye dissolved in it will undergo differential sedimentation and enrichment due to density differences, causing irreversible shifts in the transmittance-voltage curves of the top and bottom of the partition. In addition, different partitions will also have asymmetrical sedimentation differences due to vehicle tilting and lateral acceleration during turning, which seriously threatens the long-term service stability of the dimming film.

[0004] To address the aforementioned issues, existing technologies have introduced improved solutions using multiple independent dimming films spliced ​​together or indium tin oxide (ITO) photolithographically patterned electrodes. However, these solutions are all based on a horizontal partitioning architecture, which only improves wiring or splicing issues to a certain extent. They fail to fundamentally solve the unique problem of liquid crystal gravity settling in vertical partitioning, nor do they provide a systematic solution that combines vertical partitioning gradient dimming, anti-liquid crystal settling, and long-term reliability. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a vertically partitioned gradient light transmittance automotive side window dimming film and its preparation method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a vertically partitioned gradient light transmittance automotive side window dimming film, comprising a partitioned electrode substrate and a common electrode substrate; wherein the core functional unit of the partitioned electrode substrate is an embedded Ag network film, which is formed by gravure coating of PEDOT:PSS (poly(3,4-ethylenedioxythiophene):polystyrene sulfonate) seed lines on the surface of a PET film, followed by tannic acid (TA) impregnation, chemical silver plating, and encapsulation with cationic UV epoxy resin to form an embedded Ag network structure, which simultaneously serves as a low-resistance conductive layer for the partitioned electrodes, a nucleation template for subsequent polymer walls, and induces vertical alignment of liquid crystals through surface self-assembly layers; the common electrode substrate is a PET-ITO (polyethylene terephthalate-indium tin oxide) film with a vertical alignment layer on its surface, which provides a common opposing electrode and liquid crystal vertical alignment functions.

[0007] A method for preparing a vertically zoned gradient light transmittance automotive side window dimming film includes the following steps: Step S1: PET film surface pretreatment: Take a PET film and subject it to corona treatment to activate the surface, thus obtaining a pretreated PET film; Step S2: Gravure Coating: The pretreated PET film from Step S1 is reverse-gravure coated using a gravure roller. The surface of the gravure roller is engraved with grooves corresponding to vertical line patterns. PEDOT:PSS gravure ink is applied and dried to form PEDOT:PSS seed lines on its surface. Subsequently, the PET film with PEDOT:PSS seed lines is continuously impregnated with a TA solution, rinsed with water, and dried to obtain a PET film with TA impregnated seed lines on its surface. Step S3: Chemical silver plating and encapsulation: The PET film with TA impregnation seed lines on the surface obtained in step S2 is chemically silvered by chemical silver plating solution, then washed with water and annealed to obtain a PET film with Ag network on the surface; then cationic UV epoxy resin is coated on the surface of the PET film with Ag network, UV cured and then baked, and then O2 plasma treated to obtain a film with embedded Ag network. Step S4: Anchoring of thiol monomers: The PET film with embedded Ag network obtained in step S3 is immersed in the thiol monomer self-assembly solution for self-assembly wetting treatment, and then rinsed, washed and dried to obtain the embedded Ag network film with thiol monomer fixed, that is, the self-assembled anchored partitioned electrode substrate. Step S5: Lamination and liquid crystal injection: In a vacuum laminator, the ODF liquid crystal injection process is used to inject the liquid crystal mixture and align and bond the partitioned electrode substrate and the common electrode substrate obtained in step S4, and perform UV-thermal pre-curing to obtain the vertically laminated film after injection. Step S6: UV curing and post-treatment: The vertically bonded film obtained in step S5 is placed in an N2 atmosphere for UV irradiation and thermal annealing; then its edges are partially peeled off with a laser to expose the Ag contacts, and then cleaned with plasma. The electrodes in the partitioned electrode substrate and the common electrode substrate are connected to the circuit controller and fixed with conductive adhesive hot pressing to obtain a vertically partitioned gradient light transmittance automotive side window dimming film.

[0008] Furthermore, in step S1: the thickness of the PET film is 150 μm; the process parameters for the corona treatment are: power density of 100 W·min / m². 2 The linear velocity is 10 m / min.

[0009] Further, in step S2: the process parameters for gravure coating are as follows: the grooves on the surface of the gravure roller have a V-shaped cross-section, a line width of 4.5 μm, a groove depth of 10 ± 2 μm, and a spacing of 500 μm; the process parameters for reverse gravure coating are: a linear speed of 3 m / min, a linear speed ratio of the gravure roller to the PET film surface of 1.05:1, a back pressure roller linear pressure of 20 N / cm, a doctor blade angle of 18°, a doctor blade pressure of 90 kPa, and a temperature of 25°C; the process parameters for drying after coating are: a temperature of 70°C and a drying time of 40 s; the coating surface density of the obtained PEDOT:PSS seed lines is 60 ± 5 mg / m³. 2 .

[0010] The PEDOT:PSS gravure ink is prepared by the following steps: Weigh the following raw materials in parts by weight: 85-90 parts of PEDOT:PSS aqueous dispersion, 5 parts of dimethyl sulfoxide, 4-5 parts of polyvinyl alcohol aqueous solution, 3 parts of isopropanol, 0.05 parts of surfactant, and 0.01 parts of defoamer. Mix them evenly, filter, and defoam under vacuum to obtain PEDOT:PSS gravure ink; wherein the solid content of PEDOT:PSS aqueous dispersion is 1.2%, and the model is Clevios PH1000; the solid content of polyvinyl alcohol aqueous solution is 10%, and the model is PVA205; the surfactant model is Zonyl FS-300; and the defoamer model is BYK-024.

[0011] Furthermore, in step S2: the process parameters for the TA impregnation treatment are: temperature 25℃, impregnation time 30s; the TA solution is obtained by mixing tannic acid and deionized water, with a mass fraction of 10%, and the pH is adjusted to 4 with 5wt% hydrochloric acid solution.

[0012] Furthermore, in step S3: the process parameters for the chemical silver plating are: linear velocity of 0.5 m / min and immersion time of 100 s; the process parameters for annealing are: N2 atmosphere, temperature of 100 ℃, and annealing time of 15 min. The chemical silver plating solution is prepared by the following steps: 1.7g of silver nitrate is dissolved in 1L of deionized water to prepare a silver nitrate solution, 2mL of ammonia water is added and stirred, then 5.5g of glucose, 0.05g of polyvinylpyrrolidone and 10mL of ethanol are added, and stirring is continued. The pH value is adjusted to 9.5 with ammonia water to obtain the chemical silver plating solution; wherein the mass fraction of ammonia water is 25%, and the polyvinylpyrrolidone is PVP-K30.

[0013] Furthermore, in step S3, the process parameters for coating the cationic UV epoxy resin are: linear velocity of 2 m / min, temperature of 25℃, and coating surface density of 2.2 ± 0.3 g / m³. 2 The UV curing process parameters are: 365nm LED light source, intensity 150mW / cm². 2 The irradiation time is 15s and the temperature is 25℃; the post-baking process parameters are: 80℃ hot air post-baking for 30min, 120℃ hot air post-baking for 10min; the O2 plasma treatment process parameters are: O2 flow rate of 50sccm, cavity pressure of 80mTorr, radio frequency power of 100W, and treatment time of 40s. The cationic UV epoxy resin is prepared by the following steps: Weigh the following raw materials in parts by weight: 55-65 parts of 3,4-epoxycyclohexylcarboxylic acid-3',4'-epoxycyclohexylmethyl ester, 30 parts of 3-ethyl-3-hydroxymethyloxetane, 2-4 parts of diphenyliodonium hexafluorophosphate, 0.5 parts of polyacrylate leveling agent and 0.5 parts of β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, mix them evenly, and degas under vacuum to obtain the cationic UV epoxy resin; Further, in step S4: the process parameters for the self-assembly impregnation treatment are: N2 atmosphere, temperature of 35℃, and immersion time of 3 min; the self-assembly solution is prepared by the following steps: mixing bis(2-methacryloyl)oxyethyl disulfide, γ-mercaptopropyltrimethoxysilane, glacial acetic acid, and anhydrous ethanol to prepare the self-assembly solution; the molar concentration of bis(2-methacryloyl)oxyethyl disulfide in the self-assembly solution is 0.5 mmol / L, the molar concentration of γ-mercaptopropyltrimethoxysilane is 0.05 mmol / L, and the volume ratio of glacial acetic acid to anhydrous ethanol is 2:98.

[0014] Further, in step S5: the liquid crystal mixture is prepared by the following steps: weigh the following raw materials in parts by weight: 94-98 parts of nematic liquid crystal, 2 parts of dihedral dye, 1.5 parts of trimethylolpropane triacrylate, 0.3 parts of photoinitiator Irgacure 819, 0.02 parts of p-methoxyphenol, and 0.8 parts of nano-SiO2 spherical spacers, mix and stir evenly, and degas under vacuum to obtain the liquid crystal mixture; wherein the particle size of the nano-SiO2 spherical spacers is 25 μm.

[0015] Further, in step S5: the common electrode substrate is prepared by the following steps: taking a PET-ITO film and coating its surface with a liquid crystal alignment agent, the coating surface density being 0.8±0.2 g / m². 2 The linear velocity was 2 m / min, and after pre-baking at 80℃ for 2 min, a 365nm LED light source with an intensity of 150 mW / cm² was used. 2 The irradiation time is 5 seconds to form a vertically oriented layer; then, UV-thermal dual-curing epoxy adhesive is screen-printed onto the surface of the vertically oriented layer using a 300-mesh screen to form a border adhesive, controlling the printing coating density to be 9±1 g / m². 2 A common electrode substrate was prepared.

[0016] Further, in step S5: the ODF liquid crystal injection process parameters are: vacuum bonding machine cavity pressure <1Pa, and the partitioned electrode substrate and the common electrode substrate are aligned; the liquid crystal mixture is calculated according to the area of ​​each vertical partition and dripped in a vertical linear stripe array pattern; the UV-thermal pre-curing process parameters are: using a 365nm LED light source with an intensity of 50mW / cm². 2 The irradiation time was 30 seconds, followed by hot pressing at 80℃ and 0.03MPa for 10 minutes.

[0017] Furthermore, in step S6: the UV irradiation and thermal annealing process parameters are as follows: using a 365nm LED light source with an intensity of 20mW / cm². 2 Irradiation time is 120s, followed by hot air annealing at 85℃ for 1h.

[0018] Furthermore, in step S6: the laser semi-cut stripping process parameters are as follows: CO2 laser is used, power is 8W, and scanning speed is 500mm / s; the plasma cleaning process parameters are: Ar / O2 mixed plasma, Ar:O2=50:5sccm, power is 150W, and time is 15s; the conductive adhesive hot pressing process parameters are: temperature is 140℃, pressure is 2MPa, time is 12s, and CP13341 type conductive adhesive is used.

[0019] Step S1, PET film surface pretreatment: After corona treatment, polar groups such as hydroxyl and carboxyl groups are introduced into the surface of the PET film, which provides a basis for the spreading and adhesion of subsequent water-based PEDOT:PSS gravure inks.

[0020] Step S2, Gravure Coating and TA Interface Bridging: PEDOT:PSS gravure ink is transferred to the surface of the pretreated PET film using a gravure roller via reverse gravure coating, forming a regular vertical seed line array. In the PEDOT:PSS gravure ink, polyvinyl alcohol modifies the rheology to meet the gravure transfer requirements, while isopropanol and surfactant Zonyl FS-300 reduce surface tension and promote groove filling. TA impregnation is a key step in constructing a selective deposition template. Tannic acid molecules are rich in pyrogallol groups. Under weakly acidic conditions, their phenolic hydroxyl groups selectively adsorb onto the PSS sulfonic acid groups on the surface of the PEDOT:PSS seed lines through hydrogen bonding and π-π stacking; simultaneously, the phenolic hydroxyl groups attract Ag... + It has the ability to coordinate and complex, forming Ag + - Tannic acid complexes are used to construct an interfacial molecular bridging layer on the surface of the seed lines. Due to the extremely low adsorption of TA on the bare PET background, this step naturally enables the selective patterning of silver deposition sites.

[0021] Step S3, Chemical Silver Plating and Encapsulation: In the chemical silver plating solution, Ag complexed with TA... + Glucose reduction produces nano-silver particles, which preferentially nucleate on the surface of the seed lines and grow one-dimensionally along the line direction, forming a continuous Ag network. PVP-K30 selectively adsorbs onto the silver crystal surface through amide groups, inhibiting isotropic growth. Subsequently, cationic UV-cured epoxy resin is applied, followed by 365nm UV curing and post-baking to form an embedded encapsulation. The epoxy groups of the β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane coupling agent participate in UV curing, and the trimethoxysilane groups condense with the hydroxyl groups on the Ag surface, enhancing the epoxy-Ag interfacial bonding. O2 plasma treatment introduces active hydroxyl groups onto the epoxy surface, providing anchoring sites for subsequent self-assembly.

[0022] Step S4, Thiol Monomer Self-Assembly Anchoring: The film with the embedded Ag network is immersed in an ethanol-acetic acid self-assembly solution containing bis(2-methacryloyl)oxyethyl disulfide and γ-mercaptopropyltrimethoxysilane for self-assembly wetting treatment. The silane groups of γ-mercaptopropyltrimethoxysilane hydrolyze to silanol groups under acidic conditions, which condense and anchor with hydroxyl groups on the epoxy surface and in the exposed areas of the Ag network. Bis(2-methacryloyl)oxyethyl disulfide is incorporated into the self-assembled layer through an exchange reaction, forming a self-assembled monolayer rich in methacrylate end groups on the surface of the partitioned electrode substrate. This monolayer has a dual function: the methacrylate end groups participate in subsequent free radical copolymerization, and the alkylsilane chains of γ-mercaptopropyltrimethoxysilane impart vertical orientation induction capabilities to the liquid crystal.

[0023] Step S6, UV Curing and Post-treatment: After ODF liquid crystal injection and UV-thermal pre-curing bonding are completed in step S5, the photoinitiator Irgacure 819 in the liquid crystal mixture generates free radicals under UV irradiation, simultaneously initiating two types of polymerization reactions: First, the methacrylate end groups of the self-assembled molecular layer on the Ag network surface undergo free radical copolymerization with the trimethylolpropane triacrylate crosslinking monomer in the liquid crystal mixture, generating continuous vertical polymer walls in situ along each Ag line, dividing the vertical liquid crystal channel into independent microcavities; Second, trimethylolpropane triacrylate self-polymerizes within the liquid crystal layer to form a network and chemically bonds with the polymer walls, followed by thermal annealing to further relax the crosslinking of the polymer network and stabilize the liquid crystal orientation. These vertical polymer walls fundamentally block gravity- or vibration-induced long-range convection of liquid crystal and macroscopic sedimentation of bidirectional dyes: the aspect ratio of each microcavity is significantly reduced, the liquid crystal flow is strongly geometrically constrained by the polymer walls, and sedimentation caused by local density differences is limited to the scale of a single microcavity, preventing the formation of a macroscopic concentration gradient across zones. Meanwhile, the silane chains carried by the co-anchored γ-mercaptopropyltrimethoxysilane endow the polymer wall surface with vertical orientation induction capability, providing consistent vertical anchoring with the photo-aligned vertical alignment layer of the common electrode substrate on both sides of the liquid crystal microcavity.

[0024] Compared with the prior art, the beneficial effects of the present invention are: This invention discloses a vertically zoned gradient transmittance automotive side window dimming film and its preparation method. The dimming film includes a zoned electrode substrate and a common electrode substrate: the zoned electrode substrate is a thin film with an embedded Ag network, constructed through a process route of gravure coating of PEDOT:PSS seed lines, TA impregnation interface bridging, chemical silver plating, cationic UV epoxy resin embedded encapsulation, and self-assembly anchoring of thiol monomers, simultaneously serving as a low-resistance conductive layer for zoned electrodes, a polymer wall nucleation template, and a liquid crystal vertical alignment induction layer; the common electrode substrate is a PET-ITO thin film with a photo-alignment vertical alignment layer on its surface, used to provide a common opposing electrode and a normal white mode liquid crystal vertical alignment function.

[0025] This invention adopts a vertical partitioning architecture combined with a bottom unified electrode routing strategy, integrating all electrodes at the bottom edge of the window, fundamentally solving the systemic engineering problems of limited side wiring space, poor sealing penetration reliability, and wear and tear of flexible circuit boards in traditional horizontal partitioning schemes.

[0026] This invention employs an integrated embedded Ag network design that combines a conductive framework, polymer wall, and liquid crystal anchoring. The embedded Ag network serves as a low-resistance conductive layer. A self-assembled thiol monomer molecular layer introduces polymerizable methacrylate end groups onto the Ag network surface. Combined with UV irradiation, the surface-anchored methacrylate groups undergo free radical copolymerization with the trimethylolpropane triacrylate crosslinking monomer in the liquid crystal mixture, generating continuous vertical polymer walls along each Ag line. This divides the vertically open liquid crystal channel into independent microcavities, fundamentally blocking long-range convection of liquid crystal induced by gravity or vehicle vibration and macroscopic sedimentation of bidirectional dyes. This solves the core technical challenge of irreversible shift in the transmittance-voltage curve caused by gravity sedimentation of liquid crystals in vertical partitioning.

[0027] This invention utilizes the adsorption difference of TA on PEDOT:PSS seed lines and PET background to achieve selective silver deposition. Electrical isolation between each zone can be ensured by the insulating gap between the lines alone, eliminating the need for additional laser etching to penetrate the functional layer for zone isolation. This simplifies the process and avoids damage to the functional layer caused by etching. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the layered structure in steps S1-S3 of the present invention; Figure 2 This is a schematic diagram of the layered structure in steps S4-S6 of the present invention.

[0029] In the figure: 1 is the pretreated PET film; 2 is the seed line after TA impregnation; 3 is the surface Ag network formed after chemical silver plating; 4 is the encapsulation layer formed after coating with cationic UV epoxy resin; 5 is the Ag network after self-assembly and fixation of thiol monomers; 6 is the common electrode substrate; 7 is the partitioned electrode substrate. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with existing known technologies. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Preparation Example 1: Weigh the following raw materials in parts by weight: 87.5 parts of PEDOT:PSS aqueous dispersion, 5 parts of dimethyl sulfoxide, 4.5 parts of polyvinyl alcohol aqueous solution, 3 parts of isopropanol, 0.05 parts of surfactant Zonyl FS-300, and 0.01 parts of defoamer BYK-024. Mix them evenly, filter, and degas under vacuum to obtain PEDOT:PSS gravure ink; wherein the solid content of PEDOT:PSS aqueous dispersion is 1.2%, and the model is Clevios PH1000; the solid content of polyvinyl alcohol aqueous solution is 10%, and the model is PVA205.

[0032] Preparation Example 2: Compared with Preparation Example 1, the PEDOT:PSS aqueous dispersion was adjusted to 85 parts and the polyvinyl alcohol aqueous solution was adjusted to 4 parts, while the other steps were the same.

[0033] Preparation Example 3: Compared with Preparation Example 1, the PEDOT:PSS aqueous dispersion was adjusted to 90 parts and the polyvinyl alcohol aqueous solution was adjusted to 5 parts, while the other steps were the same.

[0034] Preparation Example 4: Dissolve 1.7g of silver nitrate in 1L of deionized water to prepare a silver nitrate solution. Add 2mL of ammonia and stir. Then add 5.5g of glucose, 0.05g of polyvinylpyrrolidone and 10mL of ethanol. Continue stirring and adjust the pH to 9.5 with ammonia to obtain a chemical silver plating solution. The mass fraction of ammonia is 25% and the polyvinylpyrrolidone is PVP-K30.

[0035] Preparation Example 5: Weigh the following raw materials in parts by weight: 60 parts of 3,4-epoxycyclohexylcarboxylic acid-3',4'-epoxycyclohexylmethyl ester, 30 parts of 3-ethyl-3-hydroxymethyloxetane, 3 parts of diphenyliodonium hexafluorophosphate, 0.5 parts of polyacrylate leveling agent, and 0.5 parts of β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane. Mix them evenly and degas under vacuum to obtain cationic UV epoxy resin.

[0036] Preparation Example 6: Compared with Preparation Example 5, Preparation Example 6 adjusted 3,4-epoxycyclohexylcarboxylic acid-3',4'-epoxycyclohexylmethyl ester to 55 parts and diphenyliodonium hexafluorophosphate to 2 parts, with the other steps being the same.

[0037] Preparation Example 7: Compared with Preparation Example 5, Preparation Example 7 adjusted 3,4-epoxycyclohexylcarboxylic acid-3',4'-epoxycyclohexylmethyl ester to 65 parts and diphenyliodonium hexafluorophosphate to 4 parts, with the other steps being the same.

[0038] Preparation Example 8: A self-assembled solution was prepared by mixing bis(2-methacryloyl)oxyethyl disulfide, γ-mercaptopropyltrimethoxysilane, glacial acetic acid and anhydrous ethanol; the molar concentration of bis(2-methacryloyl)oxyethyl disulfide in the self-assembled solution was 0.5 mmol / L, the molar concentration of γ-mercaptopropyltrimethoxysilane was 0.05 mmol / L, and the volume ratio of glacial acetic acid to anhydrous ethanol was 2:98.

[0039] Preparation Example 9: The following raw materials were weighed in parts by weight: 96 parts of nematic liquid crystal, 2 parts of dihedral dye, 1.5 parts of trimethylolpropane triacrylate, 0.3 parts of photoinitiator Irgacure 819, 0.02 parts of p-methoxyphenol, and 0.8 parts of nano-SiO2 spherical spacers. The mixture was stirred evenly and degassed under vacuum to obtain a liquid crystal mixture; wherein the particle size of the nano-SiO2 spherical spacers was 25 μm.

[0040] Preparation Example 10: Compared with Preparation Example 9, Preparation Example 10 changed the nematic liquid crystal to 94 parts, while the other steps were the same.

[0041] Preparation Example 11: Compared with Preparation Example 9, Preparation Example 11 changed the nematic liquid crystal to 98 parts, while the other steps were the same.

[0042] Preparation Example 12: A PET-ITO film was taken, and a liquid crystal alignment agent was coated on its surface with a coating density of 0.8 g / m². 2 The linear velocity was 2 m / min, and after pre-baking at 80℃ for 2 min, a 365nm LED light source with an intensity of 150 mW / cm² was used. 2 The irradiation time is 5 seconds to form a vertically oriented layer; then, UV-thermal dual-curing epoxy adhesive is screen-printed onto the surface of the vertically oriented layer using a 300-mesh screen to form a border adhesive, controlling the printing coating density to be 9 g / m². 2 A common electrode substrate was prepared.

[0043] Comparative Preparation Example 1: Compared with step S4 in Example 1, the immersion step of the thiol monomer self-assembly solution in Comparative Preparation Example 1 is omitted. That is, the film of the embedded Ag network is used directly as a partitioned electrode substrate without self-assembly treatment.

[0044] Example 1: A method for preparing a vertically zoned gradient light transmittance automotive side window dimming film, comprising the following steps: Step S1: PET film surface pretreatment: Take a PET film and subject it to corona treatment to activate the surface. The corona treatment process parameters are: power density of 100 W·min / m 2 A pretreated PET film was prepared at a linear velocity of 10 m / min. Step S2: Gravure Coating: The pretreated PET film from Step S1 is reverse-coated using a gravure roller. The surface of the gravure roller is engraved with grooves corresponding to vertical line patterns. The grooves on the surface of the gravure roller have a V-shaped cross-section, a line width of 4.5 μm, a groove depth of 10 μm, and a spacing of 500 μm. The PEDOT:PSS gravure ink obtained in Preparation Example 1 is used for coating. The process parameters for reverse gravure coating are: linear speed of 3 m / min, linear speed ratio of gravure roller to PET film surface of 1.05:1, back pressure roller linear pressure of 20 N / cm, doctor blade angle of 18°, doctor blade pressure of 90 kPa, and temperature of 25°C. After coating, the film is dried at 70°C for 40 s, forming PEDOT:PSS seed lines on its surface. The surface density of the resulting PEDOT:PSS seed lines is 60 mg / m³. 2Subsequently, the PET film with PEDOT:PSS seed lines was continuously impregnated with a TA solution. The TA solution was a mixture of tannic acid and deionized water with a mass fraction of 10%, and the pH was adjusted to 4 with 5wt% hydrochloric acid solution. The impregnation temperature was 25℃ and the impregnation time was 30s. After rinsing with water and drying, a PET film with TA impregnated seed lines on the surface was obtained. Step S3: Chemical silver plating and encapsulation: The PET film with TA impregnation seed lines on its surface obtained in Step S2 is chemically silvered using the chemical silver plating solution obtained in Preparation Example 4. The process parameters for chemical silver plating are: linear velocity of 0.5 m / min and immersion time of 100 s. After rinsing with water, it is annealed for 15 min in a N2 atmosphere at 100°C to obtain a PET film with an Ag network on its surface. Then, the cationic UV epoxy resin obtained in Preparation Example 5 is coated onto the surface of the PET film with the Ag network. The coating process parameters are: linear velocity of 2 m / min, temperature of 25°C, and coating surface density of 2.2 g / m³. 2 UV curing was performed using a 365nm LED light source, with an intensity of 150mW / cm². 2 The irradiation time was 15s and the temperature was 25℃; then it was dried in hot air at 80℃ for 30min and in hot air at 120℃ for 10min; then it was treated with O2 plasma with the following process parameters: O2 flow rate of 50sccm, cavity pressure of 80mTorr, radio frequency power of 100W, and processing time of 40s to obtain a thin film with embedded Ag network. Step S4: Anchoring of thiol monomers: The PET film with embedded Ag network obtained in step S3 is immersed in the self-assembly solution of thiol monomers obtained in Preparation Example 8 for self-assembly wetting treatment. The immersion is carried out for 3 minutes under N2 atmosphere and temperature of 35°C. After rinsing, washing and drying, the embedded Ag network film with thiol monomers fixed is obtained, which is the self-assembled anchored partitioned electrode substrate. Step S5: Lamination and Liquid Crystal Injection: In a vacuum laminator, an ODF liquid crystal injection process is used. The vacuum laminator chamber pressure is <1 Pa. The partitioned electrode substrate obtained in step S4 is aligned with the common electrode substrate obtained in Preparation Example 12. The liquid crystal mixture obtained in Preparation Example 9 is dripped in a vertical stripe array pattern according to the area of ​​each vertical partition, and the partitioned electrode substrate and the common electrode substrate are aligned and bonded. UV-thermal pre-curing is performed. The process parameters are: 365nm LED light source with an intensity of 50mW / cm². 2 The irradiation time was 30 seconds, and then the film was hot-pressed for 10 minutes at a temperature of 80℃ and a pressure of 0.03MPa to obtain the vertically bonded film after injection. Step S6: UV Curing and Post-treatment: The vertically bonded film obtained in Step S5 is placed in an N2 atmosphere for UV irradiation and thermal annealing. The UV irradiation process parameters are: 365nm LED light source, intensity 20mW / cm². 2 The irradiation time was 120s; the hot annealing process parameters were: 85℃ hot air annealing for 1h; then the edges were partially peeled off with a CO2 laser, with a laser power of 8W and a scanning speed of 500mm / s, exposing the Ag contacts. After that, it was cleaned with Ar / O2 mixed plasma, Ar:O2=50:5sccm, with a power of 150W and a time of 15s. CP13341 conductive adhesive was hot-pressed for 12s at a temperature of 140℃ and a pressure of 2MPa. The electrodes in the partitioned electrode substrate and the common electrode substrate were connected to the circuit controller and fixed to obtain a vertical partitioned gradient light transmittance automotive side window dimming film.

[0045] Figure 1 This is a schematic diagram of the layered structure in steps S1-S3 of the present invention; Figure 2 This is a schematic diagram of the layered structure in steps S4-S6 of the present invention.

[0046] In the figure: 1 is the pretreated PET film; 2 is the seed line after TA impregnation; 3 is the surface Ag network formed after chemical silver plating; 4 is the encapsulation layer formed after coating with cationic UV epoxy resin; 5 is the Ag network after self-assembly and fixation of thiol monomers; 6 is the common electrode substrate; 7 is the partitioned electrode substrate.

[0047] Example 2: Compared with Example 1, the PEDOT:PSS gravure ink used in step S2 is replaced by the one obtained in Example 2 instead of the one in Example 1, while the other steps are the same.

[0048] Example 3: Compared with Example 1, the PEDOT:PSS gravure ink used in step S2 is replaced by the one obtained in Example 3 instead of the one in Example 1, while the other steps are the same.

[0049] Example 4: Compared with Example 1, the cationic UV epoxy resin used in step S3 was replaced by the one obtained in Preparation Example 6 instead of Preparation Example 5, while the other steps were the same.

[0050] Example 5: Compared with Example 1, the cationic UV epoxy resin used in step S3 was replaced by the one obtained in Preparation Example 7, while the other steps were the same.

[0051] Example 6: Compared with Example 1, the liquid crystal mixture used in step S5 was replaced by the one obtained in Preparation Example 10 instead of Preparation Example 9, while the other steps were the same.

[0052] Example 7: Compared with Example 1, the liquid crystal mixture used in step S5 in Example 7 was replaced by the one obtained in Preparation Example 11 instead of Preparation Example 9, while the other steps were the same.

[0053] Example 8: Compared to Example 1, the following process parameters in Example 8 were adjusted to the lower limit of the range: the groove depth on the surface of the gravure roller in step S2 was adjusted to 8 μm, and the coating surface density of the PEDOT:PSS seed lines was adjusted to 55 mg / m³. 2 In step S3, the surface density of the cationic UV epoxy resin coating is adjusted to 1.9 g / m². 2 In Example 12, the surface density of the liquid crystal alignment agent coating in the common electrode substrate was adjusted to 0.6 g / m². 2 The surface density of the UV-thermal dual-curing epoxy adhesive border glue for printing and coating has been adjusted to 8 g / m². 2 The other steps are the same.

[0054] Example 9: Compared to Example 1, the following process parameters in Example 9 are adjusted to the upper limit of the range: the groove depth on the surface of the gravure roller in step S2 is adjusted to 12μm, and the coating surface density of the PEDOT:PSS seed lines is adjusted to 65mg / m². 2 In step S3, the surface density of the cationic UV epoxy resin coating is adjusted to 2.5 g / m². 2 In Example 12, the surface density of the liquid crystal alignment agent coating in the common electrode substrate was adjusted to 1.0 g / m². 2 The surface density of the UV-thermal dual-curing epoxy adhesive border glue for printing and coating has been adjusted to 10 g / m². 2 The other steps are the same.

[0055] Comparative Example 1: Compared with Example 1, the TA impregnation treatment step was omitted in Comparative Example 1. That is, the PET film with PEDOT:PSS seed lines was not impregnated with TA solution, but was directly rinsed with deionized water and dried. The other steps were the same.

[0056] Comparative Example 2: Compared with Example 1, Comparative Example 2 replaces the self-assembled anchored partitioned electrode substrate in step S4 with the partitioned electrode substrate without thiol monomer anchoring obtained in Comparative Preparation Example 1, that is, the thiol monomer self-assembly anchoring step is cancelled, and the other steps are the same.

[0057] Comparative Example 3: Compared with Example 1, the cationic UV epoxy resin coating and encapsulation step was omitted in Comparative Example 3, and the bare Ag network was directly used for subsequent processing. Other steps were the same.

[0058] Comparative Example 4: Compared with Example 1, the partition electrode substrate in Comparative Example 4 is replaced by a self-assembled and anchored partition electrode substrate with a PET-ITO film with photolithographic patterning (ITO layer sheet resistance 100Ω / sq, photolithographically formed with the same vertical line pattern), and steps S2, S3, and S4 are cancelled. The photolithographically patterned PET-ITO film is directly used as the partition electrode substrate for steps S5 and S6, and the other steps are the same.

[0059] The dimming films prepared in the examples and comparative examples were subjected to performance testing: 1) Referring to GB / T 35847-2018, the transmittance of the dimming film sample under power-on and power-off conditions was measured using a UV-Vis spectrophotometer in the visible light band of 380-780nm. 2) Using a constant temperature and humidity test chamber, the dimming film sample was subjected to an aging test of 1000h at 85℃ / 85%RH. The transmittance was measured before and after the test and the transmittance change rate was calculated. 3) Place the dimming film sample vertically and place it under the same vertical acceleration and deceleration conditions at 60℃ for 500h. The acceleration is 0.5g and the amplitude is 5mm. Then, measure the transmittance in the power-off state at three positions: top, middle and bottom along the height direction of each vertical partition. Calculate the difference between the transmittance at the top and bottom and the transmittance at the middle to characterize the degree of liquid crystal deposition.

[0060] The performance test results are shown in the table below: Table 1 Performance Test Results Data Analysis: The dimming films prepared in Examples 1-9 exhibit good to excellent comprehensive performance in terms of transmittance in the power-off state, transmittance in the power-on state, aging stability, and resistance to liquid crystal deposition. Regarding optical performance, the transmittance of Examples 1-9 in the power-off state is consistently high, while the transmittance in the power-on state decreases to a low level, demonstrating a significant adjustable range of transmittance and fully meeting automotive-grade transmittance requirements for automotive side windows. In terms of long-term reliability, the transmittance change rate of Examples 1-9 after aging at 85℃ / 85%RH for 1000 hours is consistently low, indicating that the cationic UV epoxy resin embedding encapsulation provides effective environmental isolation protection for the Ag network, and the liquid crystal layer-electrode covalent bonding interface provided by the thiol monomer self-assembled layer maintains good interface stability under high temperature and high humidity conditions.

[0061] In Comparative Example 1, the removal of the TA impregnation treatment resulted in severe degradation of all performance characteristics. This indicates that without the tannic acid interfacial bridging layer, silver ions cannot be effectively enriched on the seed line surface through phenolic hydroxyl coordination complexation. Silver deposition loses selectivity, the Ag network exhibits poor continuity and uneven linewidth, and stray silver particles are deposited in the PET background area, leading to leakage channels between adjacent zones. The vertical sedimentation ΔT increased significantly, dozens of times that of Example 1. This is because numerous Ag line breaks prevent the formation of polymer walls at the break points during in-situ photopolymerization, and the vertical liquid crystal channels are not effectively segmented into microcavities. Liquid crystal and dye freely settle along open channels hundreds of millimeters in diameter. This clearly demonstrates that the TA impregnation treatment is an indispensable and crucial step in achieving selective silver deposition patterning and constructing continuous polymer wall microcavity structures to suppress the gravity sedimentation of liquid crystals.

[0062] Comparative Example 2 omits the thiol monomer self-assembly anchoring step. Since the Ag network itself is unaffected, the initial optical performance is similar to that of Example 1. However, the vertical sedimentation ΔT increases significantly, fully revealing the core of the anti-settling mechanism of this invention: lacking the methacrylate end groups provided by the self-assembled molecular layer, trimethylolpropane triacrylate in step S6 cannot form a covalent bond with the Ag network surface, and vertical polymer walls cannot be generated along the Ag lines. The liquid crystal layer maintains a vertically long-range open structure, allowing free convection and sedimentation of the liquid crystal and dye under gravitational acceleration. The transmittance change rate increases significantly after aging because only physical contact and weak van der Waals forces remain between the liquid crystal layer and the electrode substrate. Under high temperature and humidity, the interfacial thermal stress cannot be released through chemical bonding, resulting in large-area local delamination. This comparative example demonstrates that although the Ag network's conductivity and epoxy encapsulation protection functions are intact, the lack of thiol monomer anchoring and in-situ generated vertical polymer walls reduces the anti-settling properties and long-term interfacial stability of the vertically partitioned dimming film. This fully demonstrates that the self-assembly anchoring of thiol monomers and the generation of vertical polymer walls through in-situ photopolymerization are the core functional links in the conductive skeleton-polymer wall-liquid crystal anchoring design of this invention, and play an irreplaceable key role in ensuring the long-term service stability of the vertical partition dimming film.

[0063] Comparative Example 3 omitted the cationic UV epoxy resin encapsulation step. The vertical settling ΔT increased significantly because the lack of physical locking and stress buffering from the epoxy encapsulation layer meant that the polymerization shrinkage stress generated when the polymer wall from in-situ photopolymerization in step S6 formed on the Ag line surface directly acted on the Ag-PET interface, causing localized peeling of the Ag network. The polymer wall in the peeled area lost its mechanical support and became suspended or collapsed, compromising the microcavity seal. The rate of change in transmittance increased significantly after aging because the bare Ag network lacked any protective layer to isolate water and oxygen and buffer mechanical stress. This fully demonstrates that cationic UV epoxy resin encapsulation provides the Ag network with three irreplaceable protective functions: anti-oxidation isolation, physical locking support, and stress buffering. It is a key guarantee for maintaining the long-term functional integrity of the embedded Ag network.

[0064] Comparative Example 4 uses a photolithographically patterned PET-ITO film to replace the embedded Ag network partitioned electrode substrate. The vertical deposition ΔT is at the same level as in Comparative Examples 1-3 because the ITO surface lacks a self-assembled anchoring layer and in-situ generated vertical polymer walls, making liquid crystal deposition unsuppressible. This fully demonstrates that the embedded Ag network electrode system of this invention has a significant and systematic advantage over the traditional ITO photolithography scheme in terms of anti-liquid crystal deposition capability.

[0065] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vertically zoned gradient light transmittance automotive side window dimming film, characterized in that: Includes partitioned electrode substrates, common electrode substrates, conductive adhesive for connection, and circuit controllers; The partition electrode substrate is a thin film with an embedded Ag network. It is formed by gravure coating of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate seed lines on the surface of a PET film, followed by tannic acid impregnation, chemical silver plating, and encapsulation with cationic UV epoxy resin. The embedded Ag network structure is used to simultaneously perform the functions of conductive partition electrodes, nucleation template function to guide the polymer wall to grow in situ along the Ag lines to divide the vertical liquid crystal channel into independent microcavities, and induce the vertical orientation of liquid crystal through the surface self-assembly layer. The common electrode substrate is a polyethylene terephthalate-indium tin oxide thin film with a vertical alignment layer on its surface, used to provide a common opposing electrode and liquid crystal vertical alignment function.

2. A method for preparing a vertically zoned gradient light transmittance automotive side window dimming film as described in claim 1, characterized in that: Includes the following steps: Step S1: PET film surface pretreatment: Take a PET film and subject it to corona treatment to activate the surface, thus obtaining a pretreated PET film; Step S2: Gravure Coating: The pretreated PET film from Step S1 is reverse-gravure coated using a gravure roller. The surface of the gravure roller is engraved with grooves corresponding to vertical line patterns. PEDOT:PSS gravure ink is applied and dried to form PEDOT:PSS seed lines on its surface. Subsequently, the PET film with PEDOT:PSS seed lines is continuously impregnated with a TA solution, rinsed with water, and dried to obtain a PET film with TA impregnated seed lines on its surface. Step S3: Chemical silver plating and encapsulation: The PET film with TA impregnation seed lines on the surface obtained in step S2 is chemically silvered by chemical silver plating solution, then washed with water and annealed to obtain a PET film with Ag network on the surface; then cationic UV epoxy resin is coated on the surface of the PET film with Ag network, UV cured and then baked, and then O2 plasma treated to obtain a film with embedded Ag network. Step S4: Anchoring of thiol monomers: Immerse the PET film with embedded Ag network obtained in step S3 into the thiol monomer self-assembly solution, and then rinse, wash and dry to obtain the embedded Ag network film with thiol monomer fixed, that is, the self-assembled anchored partitioned electrode substrate. Step S5: Lamination and liquid crystal injection: In a vacuum laminator, the ODF liquid crystal injection process is used to inject the liquid crystal mixture and align and bond the partitioned electrode substrate and the common electrode substrate obtained in step S4, and perform UV-thermal pre-curing to obtain the vertically laminated film after injection. Step S6: UV curing and post-treatment: The vertically bonded film obtained in step S5 is placed in an N2 atmosphere for UV irradiation and thermal annealing; then its edges are partially peeled off with a laser to expose the Ag contacts, and then cleaned with plasma. The electrodes in the partitioned electrode substrate and the common electrode substrate are connected to the circuit controller and fixed with conductive adhesive hot pressing to obtain a vertically partitioned gradient light transmittance automotive side window dimming film.

3. The method for preparing a vertically zoned gradient light transmittance automotive side window dimming film according to claim 2, characterized in that: In step S1: the PET film thickness is 150 μm; the corona treatment process parameters are: power density of 100 W·min / m 2 The linear velocity is 10 m / min.

4. The method for preparing a vertically zoned gradient light transmittance automotive side window dimming film according to claim 2, characterized in that: In step S2, the process parameters for gravure coating are as follows: the grooves on the surface of the gravure roller have a V-shaped cross-section, a line width of 4.5 μm, a groove depth of 10 ± 2 μm, and a spacing of 500 μm; the process parameters for reverse gravure coating are: a linear speed of 3 m / min, a linear speed ratio of the gravure roller to the PET film surface of 1.05:1, a back pressure roller linear pressure of 20 N / cm, a doctor blade angle of 18°, a doctor blade pressure of 90 kPa, and a temperature of 25°C; the process parameters for drying after coating are: a temperature of 70°C and a drying time of 40 s; the surface density of the resulting PEDOT:PSS seed lines is 60 ± 5 mg / m³. 2 ; The PEDOT:PSS gravure ink is prepared by the following steps: Weigh the following raw materials in parts by weight: 85-90 parts of PEDOT:PSS aqueous dispersion, 5 parts of dimethyl sulfoxide, 4-5 parts of polyvinyl alcohol aqueous solution, 3 parts of isopropanol, 0.05 parts of surfactant, and 0.01 parts of defoamer. Mix them evenly, filter, and defoam under vacuum to obtain PEDOT:PSS gravure ink; wherein the solid content of PEDOT:PSS aqueous dispersion is 1.2%, and the product type is Clevios PH1000; the solid content of polyvinyl alcohol aqueous solution is 10%, and the product type is PVA205; the surfactant type is Zonyl FS-300; and the defoamer type is BYK-024. The process parameters for the TA impregnation treatment are: temperature 25℃, impregnation time 30s; the TA solution is obtained by mixing tannic acid and deionized water, with a mass fraction of 10%, and the pH is adjusted to 4 with 5wt% hydrochloric acid solution.

5. The method for preparing a vertically zoned gradient light transmittance automotive side window dimming film according to claim 2, characterized in that: In step S3: the process parameters for the chemical silver plating are: linear velocity of 0.5 m / min and immersion time of 100 s; the process parameters for annealing are: N2 atmosphere, temperature of 100 ℃, and annealing time of 15 min. The chemical silver plating solution is prepared by the following steps: 1.7g of silver nitrate is dissolved in 1L of deionized water to prepare a silver nitrate solution. 2mL of ammonia water is added and stirred. Then, 5.5g of glucose, 0.05g of polyvinylpyrrolidone, and 10mL of ethanol are added and stirred continuously. The pH value is adjusted to 9.5 with ammonia water to obtain the chemical silver plating solution. The ammonia water has a mass fraction of 25%, and the polyvinylpyrrolidone is PVP-K30. The process parameters for coating the cationic UV epoxy resin are: linear velocity of 2 m / min, temperature of 25℃, and coating surface density of 2.2 ± 0.3 g / m³. 2 The UV curing process parameters are: 365nm LED light source, intensity 150mW / cm². 2 The irradiation time is 15s and the temperature is 25℃; the post-baking process parameters are: 80℃ hot air post-baking for 30min, 120℃ hot air post-baking for 10min; the O2 plasma treatment process parameters are: O2 flow rate of 50sccm, cavity pressure of 80mTorr, radio frequency power of 100W, and treatment time of 40s. The cationic UV epoxy resin is prepared by the following steps: Weigh the following raw materials in parts by weight: 55-65 parts of 3,4-epoxycyclohexylcarboxylic acid-3',4'-epoxycyclohexylmethyl ester, 30 parts of 3-ethyl-3-hydroxymethyloxetane, 2-4 parts of diphenyliodonium hexafluorophosphate, 0.5 parts of polyacrylate leveling agent, and 0.5 parts of β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, mix them evenly, and degas under vacuum to obtain the cationic UV epoxy resin.

6. The method for preparing a vertically zoned gradient light transmittance automotive side window dimming film according to claim 2, characterized in that: In step S4: the process parameters for the self-assembly impregnation treatment are: N2 atmosphere, temperature of 35℃, and immersion time of 3 min; the self-assembly solution is prepared by the following steps: mixing bis(methacryloyloxyethyl) disulfide, γ-mercaptopropyltrimethoxysilane, glacial acetic acid, and anhydrous ethanol to prepare the self-assembly solution; the molar concentration of bis(methacryloyloxyethyl) disulfide in the self-assembly solution is 0.5 mmol / L, the molar concentration of γ-mercaptopropyltrimethoxysilane is 0.05 mmol / L, and the volume ratio of glacial acetic acid to anhydrous ethanol is 2:

98.

7. The method for preparing a vertically zoned gradient light transmittance automotive side window dimming film according to claim 2, characterized in that: In step S5, the liquid crystal mixture is prepared by the following steps: Weigh the following raw materials in parts by weight: 94-98 parts of nematic liquid crystal, 2 parts of dihedral dye, 1.5 parts of trimethylolpropane triacrylate, 0.3 parts of photoinitiator Irgacure 819, 0.02 parts of p-methoxyphenol, and 0.8 parts of nano-SiO2 spherical spacers. Mix and stir evenly, and degas under vacuum to obtain the liquid crystal mixture; wherein the particle size of the nano-SiO2 spherical spacers is 25 μm. The common electrode substrate is prepared by the following steps: a PET-ITO film is taken, and a liquid crystal alignment agent is coated on its surface, with a coating area density of 0.8 ± 0.2 g / m². 2 The linear velocity was 2 m / min, and after pre-baking at 80℃ for 2 min, a 365nm LED light source with an intensity of 150 mW / cm² was used. 2 The irradiation time is 5 seconds to form a vertically oriented layer; then, UV-thermal dual-curing epoxy adhesive is screen-printed onto the surface of the vertically oriented layer using a 300-mesh screen to form a border adhesive, controlling the printing coating density to be 9±1 g / m². 2 A common electrode substrate was prepared. The ODF liquid crystal injection process parameters are as follows: vacuum bonding machine cavity pressure <1Pa, alignment of the partitioned electrode substrate and the common electrode substrate, liquid crystal mixture calculated according to the area of ​​each vertical partition, and dripped in a vertical linear stripe array pattern; the UV-thermal pre-curing process parameters are as follows: using a 365nm LED light source with an intensity of 50mW / cm². 2 The irradiation time was 30 seconds, followed by hot pressing at 80℃ and 0.03MPa for 10 minutes.

8. The method for preparing a vertically zoned gradient light transmittance automotive side window dimming film according to claim 2, characterized in that: In step S6: the UV irradiation and thermal annealing process parameters are as follows: using a 365nm LED light source with an intensity of 20mW / cm². 2 Irradiation time 120s, followed by hot air annealing at 85℃ for 1h; The laser semi-cut stripping process parameters are as follows: CO2 laser is used, power is 8W, and scanning speed is 500mm / s; the plasma cleaning process parameters are: Ar / O2 mixed plasma, Ar:O2=50:5sccm, power is 150W, and time is 15s; the conductive adhesive hot pressing process parameters are: temperature is 140℃, pressure is 2MPa, time is 12s, and CP13341 type conductive adhesive is used.

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