CN113773771A - Pressure-sensitive adhesive with low stripping force and polaroid - Google Patents

Pressure-sensitive adhesive with low stripping force and polaroid Download PDF

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Publication number
CN113773771A
CN113773771A CN202110951291.2A CN202110951291A CN113773771A CN 113773771 A CN113773771 A CN 113773771A CN 202110951291 A CN202110951291 A CN 202110951291A CN 113773771 A CN113773771 A CN 113773771A
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monomer
sensitive adhesive
pressure
coupling agent
parts
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CN113773771B (en
Inventor
俞纪贤
毛云孝
庄飞
魏磊
戚良玉
张建军
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Hefei Sanlipu Optoelectronics Technology Co ltd
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Hefei Sanlipu Optoelectronics Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04Homopolymers or copolymers of esters
    • C09J133/14Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02Non-macromolecular additives
    • C09J11/06Non-macromolecular additives organic
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08Macromolecular additives
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/30Polarising elements
    • G02B5/3025Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528Polarisers

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention discloses a low-stripping-force pressure-sensitive adhesive and a polaroid, wherein the low-stripping-force pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 26-33 parts of soft monomer, 24-28 parts of hard monomer, 4-7 parts of functional monomer, 0.1-0.2 part of initiator, 2-4 parts of curing agent and 0.2-0.6 part of silane coupling agent, wherein the hard monomer comprises a substrate and a modified monomer, the substrate is at least one of methyl methacrylate or vinyl acetate, the modified monomer is a mixture of dimethylaminoethyl methacrylate and a coupling agent, and the coupling agent is a polyfunctional group isocyanic acid radical compound.

Description

Pressure-sensitive adhesive with low stripping force and polaroid
Technical Field
The invention relates to the technical field of polaroids, and particularly belongs to a low-stripping-force pressure-sensitive adhesive and a polaroid.
Background
Polarizers (polarizers), all known as polarizers, control the polarization direction of a particular beam. When natural light passes through the polarizer, light with the vibration direction perpendicular to the transmission axis of the polarizer is absorbed, and only polarized light with the vibration direction parallel to the transmission axis of the polarizer is left in the transmitted light. Two polaroids in the liquid crystal display module are respectively attached to two sides of the glass substrate, the lower polaroid is used for converting light beams generated by the backlight source into polarized light, and the upper polaroid is used for analyzing the polarized light after the liquid crystal is electrically modulated to generate light-dark contrast so as to generate a display picture. The imaging of the liquid crystal display module is required to depend on polarized light, any polaroid is omitted, and the liquid crystal display module cannot display images. In the use of the polarizer, product inspection for optical evaluation of display capability, color gamut, impurity point, and the like of the liquid crystal display panel is performed in the case where the polarizer is attached to a liquid crystal panel. Therefore, the polarizer and the liquid crystal panel are required to be tightly attached, no bubble or other defects are generated between the polarizer and the liquid crystal panel, and the polarizer is difficult to be stripped from the liquid crystal panel if the attachment error or other reasons occur after the polarizer is attached to the liquid crystal panel due to the fact that the adhesive property of the existing polarizer pressure sensitive adhesive is too strong, and the liquid crystal panel is not easy to clean due to a large amount of residual adhesive after being stripped.
Disclosure of Invention
The invention aims to provide a pressure-sensitive adhesive with low stripping force and a polaroid, which overcome the defects of the prior art, not only can enable the polaroid to be tightly attached to a liquid crystal panel, but also can be easily stripped.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the low-stripping-force pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 26-33 parts of soft monomer, 24-28 parts of hard monomer, 4-7 parts of functional monomer, 0.1-0.2 part of initiator, 2-4 parts of curing agent and 0.2-0.6 part of silane coupling agent, wherein the hard monomer comprises a matrix and a modified monomer, the matrix is at least one of methyl methacrylate or vinyl acetate, the modified monomer is a mixture of dimethylaminoethyl methacrylate and a coupling agent, the coupling agent is a polyfunctional group isocyanic acid compound, the weight ratio of dimethylaminoethyl methacrylate to the coupling agent is 1:0.22-0.29, and the mass ratio of the matrix to the modified monomer is 1: 0.1-0.3.
Preferably, the soft monomer is an alkyl methacrylate.
Preferably, the coupling agent is
Figure BDA0003218726920000021
Wherein k is 2 and n is 1.
Preferably, the modified monomer further comprises I-type carrageenan, wherein the I-type carrageenan accounts for 0.5-1 wt% of the matrix.
Preferably, the functional monomer is 2-hydroxypropyl methacrylate.
Preferably, the curing agent is toluene diisocyanate.
Preferably, the pressure-sensitive adhesive is filled with a blue light absorber.
The preparation method of the low-peeling-force pressure-sensitive adhesive comprises the following steps:
firstly, preparing a hard monomer, dissolving a modified monomer in ethyl acetate at 50 ℃ to form a modified monomer solution with the weight percent of 5-8, heating a substrate to 80 ℃, stirring, condensing and refluxing, dropwise adding the modified monomer solution, continuing to react for 2 hours after dropwise adding is finished, and then carrying out vacuum filtration to remove the solvent to obtain the hard monomer;
dissolving a hard monomer, a soft monomer and a functional monomer in ethyl acetate to obtain a mixed solution, heating to 40 ℃, starting to dropwise add an initiator into the mixed solution, uniformly heating, wherein the dropwise adding time of the initiator is 1.5-2h, the temperature of the mixed solution after dropwise adding is 80 ℃, keeping the temperature at 80 ℃, stirring and reacting for 3-5 hours, and cooling to room temperature to obtain crude rubber; and uniformly mixing the virgin rubber, a curing agent and a silane coupling agent, drying for 2min at 120 ℃, and defoaming in vacuum to obtain the low-stripping-force pressure-sensitive adhesive.
The utility model provides a pressure-sensitive adhesive that polaroid, the coating has above-mentioned low peel force between the release film of polaroid and the polaroid, the thickness of pressure-sensitive adhesive of low peel force be 15-20 um.
Compared with the prior art, the invention has the following implementation effects:
1. the pressure-sensitive adhesive is modified by using the modified monomer, the matrix of the hard monomer is pre-polymerized under the action of the isocyanate group in the coupling agent, meanwhile, the molecules in the hard monomer are supported under the supporting action of the cyclic molecular chain of the coupling agent, so that the distance between the hard monomer and the molecular chain of the pressure-sensitive adhesive after the polymerization of the soft monomer and the functional monomer is increased, the viscoelasticity of the pressure-sensitive adhesive is improved, the cyclic molecular chain of the coupling agent limits the relative sliding of the molecular chain in the pressure-sensitive adhesive, and the stripped pressure-sensitive adhesive has no residue on the surface of a liquid crystal panel.
2. Hydroxyl contained in the I-type carrageenan added in the modified monomer can react with isocyanate groups to realize the combination of the carrageenan and the pressure-sensitive adhesive matrix, and sodium ions added in the initiator react with I-type carrageenan molecules to soften the pressure-sensitive adhesive matrix and reduce the stripping force of the pressure-sensitive adhesive.
3. According to the invention, the pressure-sensitive adhesive is filled with the blue light absorbent, so that the pressure-sensitive adhesive has blue light absorption capability, and the application range of the pressure-sensitive adhesive is expanded.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Dissolving 1.2kg of coupling agent and 5kg of dimethylaminoethyl methacrylate in ethyl acetate at 60 ℃ to form 6 wt% modified monomer solution, wherein the coupling agent is
Figure BDA0003218726920000041
Wherein k is 2 and n is 1; then 19kg of methyl methacrylate is heated to 90 ℃, stirred, condensed and refluxed, and then the couplant solution is drippedAfter the addition is finished, continuing the reaction for 2 hours, and then removing the solvent by vacuum filtration to obtain a hard monomer; mixing a hard monomer, 28kg of soft monomer alkyl methacrylate, 6kg of methacrylic acid-2-hydroxypropyl ester and 15kg of ethyl acetate to obtain a mixed solution, heating to 40 ℃, slowly and uniformly adding 0.15kg of sodium persulfate initiator into the mixed solution, uniformly heating at a constant speed, wherein the adding time of the initiator is 1.5h, the temperature of the mixed solution after dropwise adding is 80 ℃, keeping the temperature at 80 ℃, stirring for reacting for 3 hours, and cooling to room temperature to obtain virgin rubber; uniformly mixing the virgin rubber, 2kg of toluene diisocyanate and 0.2kg of methyl vinyl diethoxysilane, drying for 2min at 120 ℃, and defoaming in vacuum to obtain the low-stripping-force pressure-sensitive adhesive.
Example 2
Dissolving 1.3kg of coupling agent and 5kg of dimethylaminoethyl methacrylate in ethyl acetate at 50 ℃ to form 8 wt% of modified monomer solution, wherein the coupling agent is
Figure BDA0003218726920000042
Wherein k is 2 and n is 1; heating 20kg of vinyl acetate to 80 ℃, stirring, condensing and refluxing, dropwise adding a coupling agent solution, continuing to react for 2 hours after dropwise adding is finished, and then removing the solvent by vacuum filtration to obtain a hard monomer; mixing a hard monomer, 30kg of soft monomer isooctyl acrylate, 4kg of methacrylic acid-2-hydroxypropyl ester and 15kg of ethyl acetate to obtain a mixed solution, heating to 40 ℃, slowly and uniformly adding 0.15kg of sodium persulfate initiator into the mixed solution, uniformly heating at a constant speed, wherein the adding time of the initiator is 2 hours, the temperature of the mixed solution after dropwise adding is 70 ℃, keeping the temperature at 70 ℃, stirring for reacting for 5 hours, and cooling to room temperature to obtain crude rubber; uniformly mixing the virgin rubber, 4kg of toluene diisocyanate and 0.5kg of methyl vinyl diethoxy silane, drying for 5min at 120 ℃, and defoaming in vacuum to obtain the low-stripping-force pressure-sensitive adhesive.
Example 3
Dissolving 1.4kg of coupling agent and 5kg of dimethylaminoethyl methacrylate in ethyl acetate at 50 ℃ to form 6 wt% modified monomer solution, wherein the coupling agent is
Figure BDA0003218726920000051
Wherein k is 2 and n is 1; heating 20kg of methyl methacrylate to 80 ℃, stirring, condensing and refluxing, dropwise adding a coupling agent solution, continuing to react for 2 hours after dropwise adding is finished, and then removing the solvent by vacuum filtration to obtain a hard monomer; mixing a hard monomer, 33kg of soft monomer isooctyl acrylate, 7kg of methacrylic acid-2-hydroxypropyl ester and 15kg of ethyl acetate to obtain a mixed solution, heating to 40 ℃, slowly and uniformly adding 0.17kg of sodium persulfate initiator into the mixed solution, uniformly heating at a constant speed, wherein the adding time of the initiator is 2 hours, the temperature of the mixed solution after dropwise adding is 80 ℃, keeping the temperature at 80 ℃, stirring for reacting for 5 hours, and cooling to room temperature to obtain crude rubber; uniformly mixing the virgin rubber, 3.2kg of toluene diisocyanate and 0.3kg of methyl vinyl diethoxysilane, drying at 120 ℃ for 2min, and defoaming in vacuum to obtain the pressure-sensitive adhesive with low stripping force.
Example 4
Dissolving 1.3kg of couplant, 1.3kg of carrageenan 1.3kgI and 5kg of dimethylaminoethyl methacrylate in ethyl acetate at 50 ℃ to form 8 wt% modified monomer solution, wherein the couplant is
Figure BDA0003218726920000052
Wherein k is 2 and n is 1; heating 20kg of methyl methacrylate to 80 ℃, stirring, condensing and refluxing, dropwise adding a coupling agent solution, continuing to react for 2 hours after dropwise adding is finished, and then removing the solvent by vacuum filtration to obtain a hard monomer; mixing a hard monomer, 33kg of soft monomer isooctyl acrylate, 7kg of methacrylic acid-2-hydroxypropyl ester and 15kg of ethyl acetate to obtain a mixed solution, heating to 40 ℃, slowly and uniformly adding 0.17kg of sodium persulfate initiator into the mixed solution, uniformly heating at a constant speed, wherein the adding time of the initiator is 2 hours, the temperature of the mixed solution after dropwise adding is 80 ℃, keeping the temperature at 80 ℃, stirring for reacting for 5 hours, and cooling to room temperature to obtain crude rubber; uniformly mixing the virgin rubber, 3kg of toluene diisocyanate and 0.6kg of methyl vinyl diethoxy silane, drying for 2min at 120 ℃, and defoaming in vacuum to obtain the low-stripping-force pressure-sensitive adhesive.
Comparative example 1
The difference from example 1 is that the amount of the coupling agent added is 0.
Coating the pressure-sensitive adhesive prepared in the examples 1-3 and the comparative example 1 between a polarizer and a release film to a thickness of 15um, and then preparing a polarizer; cutting the polaroid into 300 × 25mm long strips, tearing off the release film, attaching the polaroid on a liquid crystal panel, heating to 60 ℃, keeping the temperature for 10min, then cooling to room temperature, and using an electronic universal testing machine, the model: CMT8501, and the peel force test is carried out under the conditions of an angle of 180 degrees, a stretching speed of 300mm/min, and temperatures of 25 ℃ and 40 ℃; cutting the polaroid into 25 inches, tearing off the release film, attaching the film on the liquid crystal panel, placing the liquid crystal panel into a constant temperature and humidity test box to test environmental adaptability, cooling the liquid crystal panel to room temperature after 240 hours at 60 ℃, 90% humidity and 80 ℃, and observing whether the polaroid is separated from the liquid crystal panel or not and bubbles are generated; the test results are shown in the following table:
Figure BDA0003218726920000061
from the data, the stripping force of the pressure-sensitive adhesive is obviously reduced, no residual adhesive exists after stripping, the polarizing film can be closely attached to the surface of the liquid crystal panel, no obvious bubbles exist after high temperature and high humidity, and the appearance meets the requirements of users.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The low-stripping-force pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 26-33 parts of soft monomer, 24-28 parts of hard monomer, 4-7 parts of functional monomer, 0.1-0.2 part of initiator, 2-4 parts of curing agent and 0.2-0.6 part of silane coupling agent, and is characterized in that: the hard monomer comprises a substrate and a modified monomer, wherein the substrate is at least one of methyl methacrylate or vinyl acetate, the modified monomer is a mixture of dimethylaminoethyl methacrylate and a coupling agent, and the coupling agent is a polyfunctional isocyanate compound.
2. A low peel force pressure sensitive adhesive as claimed in claim 1, wherein: the weight ratio of the dimethylaminoethyl methacrylate to the coupling agent is 1:0.22-0.29, and the mass ratio of the matrix to the modified monomer is 1: 0.1-0.3.
3. A low peel force pressure sensitive adhesive as claimed in claim 1, wherein: the pressure-sensitive adhesive is also filled with a blue light absorbent.
4. A low peel force pressure sensitive adhesive as claimed in claim 1, wherein: the soft monomer is alkyl methacrylate, the functional monomer is 2-hydroxypropyl methacrylate, and the curing agent is toluene diisocyanate.
5. The process for producing a pressure-sensitive adhesive according to any one of claims 1 to 4, wherein: the method comprises the following steps:
preparing a hard monomer, dissolving the modified monomer in ethyl acetate at 50-70 ℃ to form a modified monomer solution with the weight percent of 5-8, heating a substrate to 80-90 ℃, stirring, condensing and refluxing, dropwise adding the modified monomer solution, continuing to react for 1-3h after dropwise adding is finished, and then removing the solvent by vacuum filtration to obtain the hard monomer;
dissolving a hard monomer, a soft monomer and a functional monomer in ethyl acetate to obtain a mixed solution, heating to 30-60 ℃, starting to dropwise add an initiator into the mixed solution, uniformly heating, keeping the dropwise adding time of the initiator at 1.5-2h, keeping the temperature of the mixed solution at 70-90 ℃ after the dropwise adding is finished, keeping the temperature, stirring for reacting for 3-5h, and cooling to room temperature to obtain crude rubber; uniformly mixing the virgin rubber, the curing agent and the silane coupling agent, drying at the temperature of 100 ℃ and 120 ℃ for 2-5min, and performing vacuum defoaming to obtain the low-stripping-force pressure-sensitive adhesive.
6. A polarizer, characterized in that: the pressure-sensitive adhesive of any one of claims 1 to 4 is coated between the release film and the polarizer of the polarizer, and the thickness of the pressure-sensitive adhesive is 15 to 20 um.
CN202110951291.2A 2021-08-18 2021-08-18 Pressure-sensitive adhesive with low stripping force and polaroid Active CN113773771B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115044330A (en) * 2022-07-11 2022-09-13 惠州华星光电显示有限公司 Preparation method of pressure-sensitive adhesive, polaroid and application method of polaroid
CN116515449A (en) * 2023-05-06 2023-08-01 浙江东腾新材料有限公司 Special organic silica gel adhesive for silent tire and preparation method thereof

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JP2009221324A (en) * 2008-03-14 2009-10-01 Soken Chem & Eng Co Ltd Pressure-sensitive adhesive for optical member and protection film for optical member using the same
CN106520032A (en) * 2016-10-18 2017-03-22 无锡海特新材料研究院有限公司 High-temperature-resistant and low-peel-strength acrylate pressure-sensitive adhesive and preparation method thereof
CN108611031A (en) * 2018-03-14 2018-10-02 哈尔滨工业大学无锡新材料研究院 A kind of removable high temperature resistant pressure sensitive adhesive and preparation method thereof
CN113045997A (en) * 2021-03-05 2021-06-29 安徽格林开思茂光电科技股份有限公司 High-temperature-resistant polyimide adhesive tape

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Publication number Priority date Publication date Assignee Title
JP2009221324A (en) * 2008-03-14 2009-10-01 Soken Chem & Eng Co Ltd Pressure-sensitive adhesive for optical member and protection film for optical member using the same
CN106520032A (en) * 2016-10-18 2017-03-22 无锡海特新材料研究院有限公司 High-temperature-resistant and low-peel-strength acrylate pressure-sensitive adhesive and preparation method thereof
CN108611031A (en) * 2018-03-14 2018-10-02 哈尔滨工业大学无锡新材料研究院 A kind of removable high temperature resistant pressure sensitive adhesive and preparation method thereof
CN113045997A (en) * 2021-03-05 2021-06-29 安徽格林开思茂光电科技股份有限公司 High-temperature-resistant polyimide adhesive tape

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115044330A (en) * 2022-07-11 2022-09-13 惠州华星光电显示有限公司 Preparation method of pressure-sensitive adhesive, polaroid and application method of polaroid
CN116515449A (en) * 2023-05-06 2023-08-01 浙江东腾新材料有限公司 Special organic silica gel adhesive for silent tire and preparation method thereof
CN116515449B (en) * 2023-05-06 2024-02-09 浙江东腾新材料有限公司 Special organic silica gel adhesive for silent tire and preparation method thereof

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