CN116875213A - Optical adhesive for vehicle-mounted touch plastic cover plate and preparation method thereof - Google Patents
Optical adhesive for vehicle-mounted touch plastic cover plate and preparation method thereof Download PDFInfo
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- CN116875213A CN116875213A CN202310837759.4A CN202310837759A CN116875213A CN 116875213 A CN116875213 A CN 116875213A CN 202310837759 A CN202310837759 A CN 202310837759A CN 116875213 A CN116875213 A CN 116875213A
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- Prior art keywords
- acrylate
- cover plate
- vehicle
- plastic cover
- optical adhesive
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- 239000000853 adhesive Substances 0.000 title claims abstract description 68
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 68
- 230000003287 optical effect Effects 0.000 title claims abstract description 59
- 239000004033 plastic Substances 0.000 title claims abstract description 47
- 229920003023 plastic Polymers 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 25
- 229920006243 acrylic copolymer Polymers 0.000 claims abstract description 20
- 239000012948 isocyanate Substances 0.000 claims abstract description 19
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 19
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 18
- 239000003607 modifier Substances 0.000 claims abstract description 18
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 63
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 63
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 44
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 42
- 238000003756 stirring Methods 0.000 claims description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 27
- FTALTLPZDVFJSS-UHFFFAOYSA-N 2-(2-ethoxyethoxy)ethyl prop-2-enoate Chemical compound CCOCCOCCOC(=O)C=C FTALTLPZDVFJSS-UHFFFAOYSA-N 0.000 claims description 24
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 claims description 24
- 229920001577 copolymer Polymers 0.000 claims description 23
- 239000000178 monomer Substances 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- DXPPIEDUBFUSEZ-UHFFFAOYSA-N 6-methylheptyl prop-2-enoate Chemical compound CC(C)CCCCCOC(=O)C=C DXPPIEDUBFUSEZ-UHFFFAOYSA-N 0.000 claims description 13
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 claims description 13
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 claims description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 12
- SJIXRGNQPBQWMK-UHFFFAOYSA-N 2-(diethylamino)ethyl 2-methylprop-2-enoate Chemical compound CCN(CC)CCOC(=O)C(C)=C SJIXRGNQPBQWMK-UHFFFAOYSA-N 0.000 claims description 11
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 11
- 239000013638 trimer Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- RZVINYQDSSQUKO-UHFFFAOYSA-N 2-phenoxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC1=CC=CC=C1 RZVINYQDSSQUKO-UHFFFAOYSA-N 0.000 claims description 6
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- FWWXYLGCHHIKNY-UHFFFAOYSA-N 2-ethoxyethyl prop-2-enoate Chemical compound CCOCCOC(=O)C=C FWWXYLGCHHIKNY-UHFFFAOYSA-N 0.000 claims description 3
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 3
- OXYZDRAJMHGSMW-UHFFFAOYSA-N 3-chloropropyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)CCCCl OXYZDRAJMHGSMW-UHFFFAOYSA-N 0.000 claims description 3
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 claims description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 3
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 claims description 3
- SBRXLTRZCJVAPH-UHFFFAOYSA-N ethyl(trimethoxy)silane Chemical compound CC[Si](OC)(OC)OC SBRXLTRZCJVAPH-UHFFFAOYSA-N 0.000 claims description 3
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 3
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 3
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims description 3
- MQWFLKHKWJMCEN-UHFFFAOYSA-N n'-[3-[dimethoxy(methyl)silyl]propyl]ethane-1,2-diamine Chemical compound CO[Si](C)(OC)CCCNCCN MQWFLKHKWJMCEN-UHFFFAOYSA-N 0.000 claims description 3
- CKIXFRABPZURLY-UHFFFAOYSA-N triethoxy(3-isocyanopropyl)silane Chemical compound CCO[Si](OCC)(OCC)CCC[N+]#[C-] CKIXFRABPZURLY-UHFFFAOYSA-N 0.000 claims description 3
- DENFJSAFJTVPJR-UHFFFAOYSA-N triethoxy(ethyl)silane Chemical compound CCO[Si](CC)(OCC)OCC DENFJSAFJTVPJR-UHFFFAOYSA-N 0.000 claims description 3
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 3
- PHQOGHDTIVQXHL-UHFFFAOYSA-N n'-(3-trimethoxysilylpropyl)ethane-1,2-diamine Chemical compound CO[Si](OC)(OC)CCCNCCN PHQOGHDTIVQXHL-UHFFFAOYSA-N 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 claims 1
- 238000002834 transmittance Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000004383 yellowing Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 11
- 229920002799 BoPET Polymers 0.000 description 5
- 239000012790 adhesive layer Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920003067 (meth)acrylic acid ester copolymer Polymers 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
- C08G81/02—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C08G81/021—Block or graft polymers containing only sequences of polymers of C08C or C08F
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J187/00—Adhesives based on unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
- C09J187/005—Block or graft polymers not provided for in groups C09J101/00 - C09J185/04
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/255—Polyesters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses an optical adhesive for a vehicle-mounted touch plastic cover plate and a preparation method thereof, wherein the optical adhesive comprises the following components in parts by weight: 50-99 parts of (methyl) acrylic copolymer, 0.1-0.2 part of isocyanate cross-linking agent and 0.05-0.1 part of adhesive force modifier. The optical adhesive for the vehicle-mounted touch plastic cover plate has good adhesiveness to the plastic cover plate, has the advantages of high light transmittance, low haze and low yellowing, can effectively inhibit bubbles generated by the plastic cover plate in a high-temperature (100 ℃) environment, solves the problem of bubbles generated by using the traditional OCA optical adhesive in a vehicle-mounted touch screen, and can be better applied to the fields with higher environmental test requirements such as vehicle-mounted display optical adhesive and the like.
Description
Technical Field
The invention relates to the field of optical cement materials, in particular to an optical cement for a vehicle-mounted touch plastic cover plate and a preparation method thereof.
Background
In recent years, OCA (optically clear adhesive) has been widely used in electronic devices such as touch displays, smart phones, tablet computers, electronic readers, and the like, because of its high light transmittance, high adhesion, yellowing resistance, and non-corrosiveness to ITO and electronic devices in particular.
OCA optical adhesives are commonly used in the field of vehicle touch applications to bond glass or plastic covers or display modules (LCDs and OLEDs). The glass cover plate has the advantages of high hardness, high light transmittance and the like, and is widely applied to touch screens, but is not explosion-proof, so that the application of the glass cover plate in vehicle-mounted touch control is limited. The Polycarbonate (PC) and polymethyl methacrylate (PMMA) plastic cover plate has the advantages of low cost, good optical performance, explosion prevention, impact resistance and the like, and plays an irreplaceable role in the vehicle-mounted optical touch screen. However, after the common OCA is attached to the plastic cover plate, bubbles are easy to generate in a high-temperature environment, so that the use of the vehicle-mounted touch screen by a user is affected.
Therefore, there is a need in the art for improvements that provide a more reliable solution.
Disclosure of Invention
The invention aims to solve the technical problem of providing an optical adhesive for a vehicle-mounted touch plastic cover plate and a preparation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme: the optical adhesive for the vehicle-mounted touch plastic cover plate comprises the following components in parts by weight: 50-99 parts of (methyl) acrylic copolymer, 1-25 parts of polymerizable macromer, 0.1-0.2 part of isocyanate cross-linking agent and 0.05-0.1 part of adhesive force modifier;
the (meth) acrylic copolymer comprises the following components in mass fraction: 50-90% of optical acrylate main monomer, 10-50% of acrylate monomer containing crosslinking functional monomer and 1-25% of polymerizable macromer.
Preferably, the optical acrylate main monomer is selected from one or more of ethyl acrylate, butyl acrylate, isooctyl acrylate, methyl methacrylate, ethoxyethoxyethyl acrylate, 2-phenoxyethyl acrylate and N-vinyl pyrrolidone.
Preferably, the acrylate monomer containing the crosslinkable functional monomer is selected from one or more of hydroxyethyl acrylate, hydroxybutyl acrylate, acrylamide and acrylic acid.
Preferably, the polymerizable macromer is obtained by polymerizing one or more of methyl methacrylate, glycidyl methacrylate, ethoxyethoxyethyl acrylate, 2-phenoxyethyl acrylate, N-vinylpyrrolidone and diethylaminoethyl methacrylate.
Preferably, the polymerizable macromer is a copolymer of glycidyl methacrylate and diethylaminoethyl methacrylate, and is specifically prepared by the following preparation method: mixing 150-180g of glycidyl methacrylate and 20-50g of diethylaminoethyl methacrylate, introducing nitrogen, stirring to remove air, heating to 80-90 ℃, adding 5-6g of azodiisobutyronitrile, and reacting for 5-10 hours to obtain the polymerizable macromonomer.
Preferably, the isocyanate crosslinking agent is selected from any one or more of alicyclic diisocyanates and their biurets or trimers.
Preferably, the isocyanate crosslinking agent is selected from one or more of hexamethylene diisocyanate trimer, 2, 4-trimethylhexamethylene diisocyanate, 2, 4-trimethyldiisocyanate, isophorone diisocyanate trimer, 4' -dicyclohexylmethane diisocyanate.
Preferably, the adhesion modifier is at least one selected from 3-aminopropyl trimethoxysilane, N- (2-aminoethyl) -3-aminopropyl methyl dimethoxy silane;
or a mixture of at least one of 3-chloropropyl trimethoxysilane and 3-isocyano propyl triethoxysilane and at least one of methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane and ethyltrimethoxysilane.
Preferably, the (meth) acrylic copolymer is prepared by the following method:
s1, mixing 40-160g of ethyl acrylate, 27-108g of ethoxy ethyl acrylate, 9-36g of methyl methacrylate, 14-54g of hydroxybutyl acrylate, 24-96g of toluene, 45-180g of ethyl acetate and 24-96g of butanone, introducing nitrogen, stirring to remove air, heating to 60-75 ℃, then adding 0.12-0.5g of azo-diisobutyronitrile, and reacting for 1.5-6 hours;
s2, adding 27-108g of ethyl acrylate, 18-72g of ethoxyethoxy ethyl acrylate, 6-24g of methyl methacrylate, 8-36g of hydroxybutyl acrylate, 16-64g of toluene, 30-120g of ethyl acetate and 16-64g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.08-0.32g of azodiisobutyronitrile for reaction for 1.5-6 hours at 70-80 ℃; adding 0.3-1.2g of azodiisobutyronitrile, dripping 1-6g of polymerizable macromer, and reacting for 1-4 hours at 75-85 ℃ to obtain the (methyl) acrylic ester copolymer.
Preferably, the (meth) acrylic copolymer is prepared by the following method:
s1, mixing 30-120g of butyl acrylate, 10-42g of isooctyl acrylate, 27-108g of ethoxyethoxy ethyl acrylate, 9-36g of methyl methacrylate, 14-54g of hydroxybutyl acrylate, 24-96g of toluene, 45-180g of ethyl acetate and 24-96g of butanone, introducing nitrogen, stirring to remove air, heating to 60-75 ℃, then adding 0.12-0.5g of azodiisobutyronitrile, and reacting for 1.5-6 hours;
s2, adding 21-84g of butyl acrylate, 5-24g of isooctyl acrylate, 18-72g of ethoxyethoxy ethyl acrylate, 6-24g of methyl methacrylate, 8-36g of hydroxybutyl acrylate, 16-64g of toluene, 30-120g of ethyl acetate and 16-64g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.08-0.32g of azodiisobutyronitrile for reaction for 1.5-6 hours at 70-80 ℃; adding 0.3-1.2g of azodiisobutyronitrile, dripping 1-6g of polymerizable macromer, and reacting for 1-4 hours at 75-85 ℃ to obtain the (methyl) acrylic ester copolymer.
The invention also provides a preparation method of the optical adhesive for the vehicle-mounted touch plastic cover plate, which is characterized by comprising the following steps of:
mixing the (methyl) acrylic ester copolymer, the isocyanate crosslinking agent and the adhesive force modifier, stirring for 5-20min at the temperature of 20-35 ℃, vacuumizing, and standing until no bubble exists, thus obtaining the optical adhesive for the vehicle-mounted touch plastic cover plate.
The beneficial effects of the invention are as follows:
the optical adhesive for the vehicle-mounted touch plastic cover plate has good adhesiveness to the plastic cover plate, has the advantages of high light transmittance, low haze and low yellowing, can effectively inhibit bubbles generated by the plastic cover plate in a high-temperature (100 ℃) environment, solves the problem of bubbles generated by using the traditional OCA optical adhesive in a vehicle-mounted touch screen, and can be better applied to the fields with higher environmental test requirements such as vehicle-mounted display optical adhesive and the like.
The OCA optical adhesive is added with the adhesive force modifier and hydrophilic groups are introduced, so that the effect of preventing whitening and fogging under the environment of high temperature and high humidity or water boiling is achieved;
the invention adds the polymerizable macromer into the (methyl) acrylic copolymer to form the side chain based on the polymerizable macromer, and the introduction of the side chain can obviously improve the adhesiveness of the optical cement to the plastic cover plate.
Detailed Description
The present invention is described in further detail below with reference to examples to enable those skilled in the art to practice the same by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The test methods used in the following examples are conventional methods unless otherwise specified. The material reagents and the like used in the following examples are commercially available unless otherwise specified. The following examples were conducted under conventional conditions or conditions recommended by the manufacturer, without specifying the specific conditions. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The invention provides an optical adhesive for a vehicle-mounted touch plastic cover plate, which comprises the following components in parts by weight: 50-99 parts of (methyl) acrylic copolymer, 1-25 parts of polymerizable macromer, 0.1-0.2 part of isocyanate cross-linking agent and 0.05-0.1 part of adhesive force modifier;
the (meth) acrylic copolymer comprises the following components in mass fraction: 50-90% of optical acrylate main monomer, 10-50% of acrylate monomer containing crosslinking functional monomer and 1-25% of polymerizable macromer.
In a preferred embodiment, the optical acrylate primary monomer is selected from one or more of ethyl acrylate, butyl acrylate, isooctyl acrylate, methyl methacrylate, ethoxyethoxyethyl acrylate, 2-phenoxyethyl acrylate, N-vinyl pyrrolidone.
In a preferred embodiment, the acrylate monomer containing a crosslinkable functional monomer is selected from one or more of hydroxyethyl acrylate, hydroxybutyl acrylate, acrylamide, acrylic acid.
The polymerizable macromer has an unsaturated group such as an ethylenically unsaturated double bond. In a preferred embodiment, the polymerizable macromer is obtained by polymerization of one or more of methyl methacrylate, glycidyl methacrylate, ethoxyethoxyethyl acrylate, 2-phenoxyethyl acrylate, N-vinylpyrrolidone, diethylaminoethyl methacrylate. The addition of the polymerizable macromer to the (meth) acrylic copolymer can form a side chain based on the polymerizable macromer, and the introduction of the side chain can significantly improve the adhesion of the optical cement to the plastic cover plate. Preferably, the polymerizable macromer is a polymer having a weight average molecular weight (Mw) of typically 5000 to 3 tens of thousands, more preferably 1 to 3 tens of thousands. The weight average molecular weight (Mw) of the polymerizable macromonomer in the present specification means a weight average molecular weight in terms of standard polystyrene measured by Gel Permeation Chromatography (GPC).
In a preferred embodiment, the polymerizable macromer is a copolymer of glycidyl methacrylate and diethylaminoethyl methacrylate, in particular obtained by the following preparation method: mixing 150-180g of glycidyl methacrylate and 20-50g of diethylaminoethyl methacrylate, introducing nitrogen, stirring to remove air, heating to 80-90 ℃, adding 5-6g of azodiisobutyronitrile, and reacting for 5-10 hours to obtain the polymerizable macromonomer.
In a preferred embodiment, the isocyanate crosslinking agent is selected from any one or more of the group consisting of cycloaliphatic diisocyanates and their biurets or trimers. In a further preferred embodiment, the isocyanate crosslinker is selected from one or more of the group consisting of trimers of hexamethylene diisocyanate, 2, 4-trimethylhexamethylene diisocyanate, 2, 4-trimethyldiisocyanate, isophorone diisocyanate trimers, 4' -dicyclohexylmethane diisocyanate.
The adhesive force modifier is a silane coupling agent with good compatibility with the (methyl) acrylic polymer, and specifically is at least one selected from 3-aminopropyl trimethoxysilane, N- (2-aminoethyl) -3-aminopropyl trimethoxysilane and N- (2-aminoethyl) -3-aminopropyl methyldimethoxy silane;
or a mixture of at least one of 3-chloropropyl trimethoxysilane and 3-isocyano propyl triethoxysilane and at least one of methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane and ethyltrimethoxysilane.
In a preferred embodiment, the (meth) acrylic copolymer is prepared by the following method:
s1, mixing 40-160g of ethyl acrylate, 27-108g of ethoxy ethyl acrylate, 9-36g of methyl methacrylate, 14-54g of hydroxybutyl acrylate, 24-96g of toluene, 45-180g of ethyl acetate and 24-96g of butanone, introducing nitrogen, stirring to remove air, heating to 60-75 ℃, then adding 0.12-0.5g of azo-diisobutyronitrile, and reacting for 1.5-6 hours;
s2, adding 27-108g of ethyl acrylate, 18-72g of ethoxyethoxy ethyl acrylate, 6-24g of methyl methacrylate, 8-36g of hydroxybutyl acrylate, 16-64g of toluene, 30-120g of ethyl acetate and 16-64g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.08-0.32g of azodiisobutyronitrile for reaction for 1.5-6 hours at 70-80 ℃; adding 0.3-1.2g of azodiisobutyronitrile, dripping 1-6g of polymerizable macromer, and reacting for 1-4 hours at 75-85 ℃ to obtain the (methyl) acrylic ester copolymer.
In a preferred embodiment, the (meth) acrylic copolymer is prepared by the following method:
s1, mixing 30-120g of butyl acrylate, 10-42g of isooctyl acrylate, 27-108g of ethoxyethoxy ethyl acrylate, 9-36g of methyl methacrylate, 14-54g of hydroxybutyl acrylate, 24-96g of toluene, 45-180g of ethyl acetate and 24-96g of butanone, introducing nitrogen, stirring to remove air, heating to 60-75 ℃, then adding 0.12-0.5g of azodiisobutyronitrile, and reacting for 1.5-6 hours;
s2, adding 21-84g of butyl acrylate, 5-24g of isooctyl acrylate, 18-72g of ethoxyethoxy ethyl acrylate, 6-24g of methyl methacrylate, 8-36g of hydroxybutyl acrylate, 16-64g of toluene, 30-120g of ethyl acetate and 16-64g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.08-0.32g of azodiisobutyronitrile for reaction for 1.5-6 hours at 70-80 ℃; adding 0.3-1.2g of azodiisobutyronitrile, dripping 1-6g of polymerizable macromer, and reacting for 1-4 hours at 75-85 ℃ to obtain the (methyl) acrylic ester copolymer.
The invention also provides a preparation method of the optical adhesive for the vehicle-mounted touch plastic cover plate, which comprises the following steps:
mixing the (methyl) acrylic ester copolymer, the isocyanate crosslinking agent and the adhesive force modifier, stirring for 5-20min at the temperature of 20-35 ℃, vacuumizing, and standing until no bubble exists, thus obtaining the optical adhesive for the vehicle-mounted touch plastic cover plate. When in use, the optical cement is coated and then cured and molded at 50-80 ℃.
The foregoing is a general inventive concept and the following detailed examples and comparative examples are provided on the basis thereof to further illustrate the invention.
The following five (meth) acrylic acid ester copolymers were synthesized in advance
1. Methyl) acrylic ester copolymer A-1
S1, mixing 81g of ethyl acrylate, 54g of ethoxyethoxy ethyl acrylate, 18g of methyl methacrylate, 27g of hydroxybutyl acrylate, 48g of toluene, 90g of ethyl acetate and 48g of butanone in a reactor, introducing nitrogen, stirring to remove air, heating to 67 ℃, then adding 0.25g of azodiisobutyronitrile, and reacting for 3 hours;
s2, adding 54g of ethyl acrylate, 36g of ethoxyethoxy ethyl acrylate, 12g of methyl methacrylate, 18g of hydroxybutyl acrylate, 32g of toluene, 60g of ethyl acetate and 32g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.16g of azodiisobutyronitrile for reaction for 3 hours at 75 ℃; 0.6g of azobisisobutyronitrile was added thereto, 3g of a polymerizable macromonomer was added dropwise thereto, and the reaction was carried out at 80℃for 2 hours to obtain (meth) acrylic copolymer A-1.
2. Methyl) acrylic ester copolymer A-2
S1, mixing 81g of butyl acrylate, 54g of ethoxyethoxy ethyl acrylate, 18g of methyl methacrylate, 27g of hydroxybutyl acrylate, 48g of toluene, 90g of ethyl acetate and 48g of butanone in a reactor, introducing nitrogen, stirring to remove air, heating to 67 ℃, then adding 0.25g of azodiisobutyronitrile, and reacting for 3 hours;
s2, adding 54g of butyl acrylate, 36g of ethoxyethoxy ethyl acrylate, 12g of methyl methacrylate, 18g of hydroxybutyl acrylate, 32g of toluene, 60g of ethyl acetate and 32g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.16g of azodiisobutyronitrile for reaction for 3 hours at 75 ℃; 0.6g of azobisisobutyronitrile was added thereto, 3g of a polymerizable macromonomer was added dropwise thereto, and the reaction was carried out at 80℃for 2 hours to obtain (meth) acrylic copolymer A-2.
3. Methyl) acrylic ester copolymer A-3
S1, mixing 60g of butyl acrylate, 21g of isooctyl acrylate, 54g of ethoxyethoxy ethyl acrylate, 18g of methyl methacrylate, 27g of hydroxybutyl acrylate, 48g of toluene, 90g of ethyl acetate and 48g of butanone, introducing nitrogen, stirring to remove air, heating to 67 ℃, then adding 0.25g of azodiisobutyronitrile, and reacting for 3 hours;
s2, adding 42g of butyl acrylate, 12g of isooctyl acrylate, 36g of ethoxyethoxy ethyl acrylate, 12g of methyl methacrylate, 18g of hydroxybutyl acrylate, 32g of toluene, 60g of ethyl acetate and 32g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.16g of azobisisobutyronitrile to react for 3 hours at 75 ℃; 0.6g of azobisisobutyronitrile was added thereto, 3g of a polymerizable macromonomer was added dropwise thereto, and the reaction was carried out at 80℃for 2 hours to obtain (meth) acrylic copolymer A-3.
4. Methyl) acrylic ester copolymer A-4
S1, 102g of butyl acrylate, 33g of isooctyl acrylate, 90g of ethoxyethoxy ethyl acrylate, 30g of methyl methacrylate, 45g of hydroxybutyl acrylate, 80g of toluene, 170g of ethyl acetate and 80g of butanone are mixed, nitrogen is introduced, air is removed through stirring, the mixture is heated to 67 ℃, and then 0.4g of azodiisobutyronitrile is added for reaction for 3 hours;
s2, heating to 75 ℃, then adding 0.6g of azodiisobutyronitrile, and reacting for 3 hours at 75 ℃; 0.6g of azobisisobutyronitrile was added thereto, 3g of a polymerizable macromonomer was added dropwise thereto, and the reaction was carried out at 80℃for 2 hours to obtain (meth) acrylic copolymer A-4.
5. Methyl) acrylic ester copolymer A-5
S1, mixing 81g of ethyl acrylate, 54g of ethoxyethoxy ethyl acrylate, 18g of methyl methacrylate, 27g of hydroxybutyl acrylate, 48g of toluene, 90g of ethyl acetate and 48g of butanone in a reactor, introducing nitrogen, stirring to remove air, heating to 67 ℃, then adding 0.25g of azodiisobutyronitrile, and reacting for 3 hours;
s2, adding 54g of ethyl acrylate, 36g of ethoxyethoxy ethyl acrylate, 12g of methyl methacrylate, 18g of hydroxybutyl acrylate, 32g of toluene, 60g of ethyl acetate and 32g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.16g of azodiisobutyronitrile for reaction for 3 hours at 75 ℃; 0.6g of azobisisobutyronitrile was added thereto and reacted at 80℃for 2 hours to obtain (meth) acrylic copolymer A-5.
In the following examples 1-3, the polymerizable macromers were copolymers of glycidyl methacrylate and diethylaminoethyl methacrylate, and the preparation method thereof was as follows: 165g of glycidyl methacrylate and 35g of diethylaminoethyl methacrylate were mixed, nitrogen was introduced and air was removed by stirring, the mixture was heated to 85℃and then 5.5g of azobisisobutyronitrile was added and reacted for 8 hours to obtain a polymerizable macromonomer. The polymerizable macromer in comparative example 1 was the same as in examples 1 to 3.
The isocyanate crosslinking agent in examples 1 to 3 and comparative example 1 was bayer L75, and the adhesion modifier was aladine T103634.
Example 1
The preparation method of the optical adhesive for the vehicle-mounted touch plastic cover plate comprises the following steps of:
mixing 60g of (methyl) acrylic ester copolymer A-1, 0.1g of isocyanate crosslinking agent and 0.06g of adhesive force modifier, stirring for 10min at 25 ℃, vacuumizing, and standing until no bubble exists, thus obtaining the optical adhesive for the vehicle-mounted touch plastic cover plate.
The obtained optical adhesive was coated on a PET film, dried at 120℃for 5 minutes to remove the solvent, to form a film having a thickness of 100. Mu.m, a 50 μm release film was attached to the other side of the film, and curing was performed at 70℃under 50% RH for 3 days to obtain an adhesive sheet having an adhesive layer having a thickness of 100. Mu.m.
Example 2
The preparation method of the optical adhesive for the vehicle-mounted touch plastic cover plate comprises the following steps of:
mixing 60g of (methyl) acrylic ester copolymer A-2, 0.1g of isocyanate crosslinking agent and 0.06g of adhesive force modifier, stirring for 10min at 25 ℃, vacuumizing, and standing until no bubble exists, thus obtaining the optical adhesive for the vehicle-mounted touch plastic cover plate.
The obtained optical adhesive was coated on a PET film, dried at 120℃for 5 minutes to remove the solvent, to form a film having a thickness of 100. Mu.m, a 50 μm release film was attached to the other side of the film, and curing was performed at 70℃under 50% RH for 3 days to obtain an adhesive sheet having an adhesive layer having a thickness of 100. Mu.m.
Example 3
The preparation method of the optical adhesive for the vehicle-mounted touch plastic cover plate comprises the following steps of:
mixing 60g of (methyl) acrylic ester copolymer A-3, 0.1g of isocyanate crosslinking agent and 0.06g of adhesive force modifier, stirring for 10min at 25 ℃, vacuumizing, and standing until no bubble exists, thus obtaining the optical adhesive for the vehicle-mounted touch plastic cover plate.
The obtained optical adhesive was coated on a PET film, dried at 120℃for 5 minutes to remove the solvent, to form a film having a thickness of 100. Mu.m, a 50 μm release film was attached to the other side of the film, and curing was performed at 70℃under 50% RH for 3 days to obtain an adhesive sheet having an adhesive layer having a thickness of 100. Mu.m.
Comparative example 1
The preparation method of the optical adhesive for the vehicle-mounted touch plastic cover plate comprises the following steps of:
mixing 60g of (methyl) acrylic ester copolymer A-4, 0.1g of isocyanate crosslinking agent and 0.06g of adhesive force modifier, stirring for 10min at 25 ℃, vacuumizing, and standing until no bubble exists, thus obtaining the optical adhesive for the vehicle-mounted touch plastic cover plate.
The obtained optical adhesive was coated on a PET film, dried at 120℃for 5 minutes to remove the solvent, to form a film having a thickness of 100. Mu.m, a 50 μm release film was attached to the other side of the film, and curing was performed at 70℃under 50% RH for 3 days to obtain an adhesive sheet having an adhesive layer having a thickness of 100. Mu.m.
Comparative example 2
Mixing 60g of (methyl) acrylic ester copolymer A-5, 0.1g of isocyanate crosslinking agent and 0.06g of adhesive force modifier, stirring for 10min at 25 ℃, vacuumizing, and standing until no bubble exists, thus obtaining the optical adhesive for the vehicle-mounted touch plastic cover plate.
The obtained optical adhesive was coated on a PET film, dried at 120℃for 5 minutes to remove the solvent, to form a film having a thickness of 100. Mu.m, a 50 μm release film was attached to the other side of the film, and curing was performed at 70℃under 50% RH for 3 days to obtain an adhesive sheet having an adhesive layer having a thickness of 100. Mu.m.
The adhesive sheets prepared in examples 1-3 and comparative examples 1-2 were subjected to the following performance test:
after the release film of the adhesive sheet was peeled off, a 250umPC/PMMA plate was attached. The obtained sample was placed in a vacuum deaerator at 50℃and 0.5MPa for 30 minutes, and then tested for peeling force, holding power, light transmittance and haze. And testing at high temperature (100 ℃) for 10 days, and observing whether bubbles exist in the sample. Wherein b * Is a yellowing value.
The test results are shown in table 1 below:
TABLE 1
| Name of the name | 180 DEG peel force/(N/25 mm) | Normal temperature holding force | Transmittance/% | Haze/% | b * | Air bubble |
| Example 1 | 16 | ＞24h | 93.16 | 0.24 | 0.16 | Without any means for |
| Example 2 | 18 | ＞24h | 93.07 | 0.2 | 0.13 | Without any means for |
| Example 3 | 16 | ＞24h | 93.04 | 0.21 | 0.13 | Without any means for |
| Comparative example 1 | 18 | ＞24h | 93.02 | 0.26 | 0.24 | Has the following components |
| Comparative example 2 | 14 | ＞24h | 93.32 | 0.26 | 0.15 | Has the following components |
According to the test results of table 1, examples 1 to 3 compare with comparative example 1: the polymeric monomer of examples 1-3 has a relatively short molecular chain and a high chemical crosslinking density, so that the polymeric monomer has a relatively high-temperature modulus, can inhibit the discharge of gas generated by the plastic cover plate in a high-temperature environment, and has good adhesion to the plastic cover plate. While the polymerized monomer of comparative example 1 had a low molecular chain length of isooctyl acrylate and a low high temperature modulus, the gas released from the plastic cover plate in a high temperature environment could invade the glue layer to generate bubbles. In comparative example 2, since the polymerizable macromonomer was not contained, there was insufficient side chain to wet the substrate surface or form bonding with the substrate surface, resulting in insufficient tackiness to adhere to the plastic cover plate under high temperature environment, and thus more bubbles were generated. The products of examples 1-3 have the characteristics of high light transmittance, low haze and low yellowing, and are suitable for the fields with high environmental test requirements such as vehicle-mounted display optical adhesives.
Although embodiments of the present invention have been disclosed above, it is not limited to the use of the description and embodiments, it is well suited to various fields of use for the invention, and further modifications may be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the particular details without departing from the general concepts defined in the claims and the equivalents thereof.
Claims (11)
1. The optical adhesive for the vehicle-mounted touch plastic cover plate is characterized by comprising the following components in parts by weight: 50-99 parts of (methyl) acrylic copolymer, 0.1-0.2 part of isocyanate cross-linking agent and 0.05-0.1 part of adhesive force modifier;
the (meth) acrylic copolymer comprises the following components in mass fraction: 50-90% of optical acrylate main monomer, 10-50% of acrylate monomer containing crosslinking functional monomer and 1-25% of polymerizable macromer.
2. The optical adhesive for the vehicle-mounted touch plastic cover plate according to claim 1, wherein the optical acrylate main monomer is selected from one or more of ethyl acrylate, butyl acrylate, isooctyl acrylate, methyl methacrylate, ethoxyethoxyethyl acrylate, 2-phenoxyethyl acrylate and N-vinyl pyrrolidone.
3. The optical adhesive for a vehicle-mounted touch plastic cover plate according to claim 1, wherein the acrylate monomer containing the crosslinkable functional monomer is one or more selected from hydroxyethyl acrylate, hydroxybutyl acrylate, acrylamide and acrylic acid.
4. The optical adhesive for the vehicle-mounted touch plastic cover plate according to claim 1, wherein the polymerizable macromer is obtained by polymerization of one or more of methyl methacrylate, glycidyl methacrylate, ethoxyethoxyethyl acrylate, 2-phenoxyethyl acrylate, N-vinyl pyrrolidone and diethylaminoethyl methacrylate.
5. The optical adhesive for the vehicle-mounted touch plastic cover plate according to claim 1, wherein the polymerizable macromer is a copolymer of glycidyl methacrylate and diethylaminoethyl methacrylate, and the preparation method comprises the following steps: mixing 150-180g of glycidyl methacrylate and 20-50g of diethylaminoethyl methacrylate, introducing nitrogen, stirring to remove air, heating to 80-90 ℃, adding 5-6g of azodiisobutyronitrile, and reacting for 5-10 hours to obtain the polymerizable macromonomer.
6. The optical adhesive for a vehicle-mounted touch plastic cover plate according to claim 1, wherein the isocyanate crosslinking agent is selected from any one or more of alicyclic diisocyanates and biuret or trimer thereof.
7. The optical adhesive for a vehicle-mounted touch plastic cover plate according to claim 1, wherein the isocyanate crosslinking agent is one or more selected from hexamethylene diisocyanate trimer, 2, 4-trimethylhexamethylene diisocyanate, 2, 4-trimethyldiisocyanate, isophorone diisocyanate trimer and 4,4' -dicyclohexylmethane diisocyanate.
8. The optical adhesive force modifier for the vehicle-mounted touch plastic cover plate according to claim 1, wherein the adhesive force modifier is at least one of 3-aminopropyl trimethoxysilane, N- (2-aminoethyl) -3-aminopropyl trimethoxysilane and N- (2-aminoethyl) -3-aminopropyl methyldimethoxy silane;
or a mixture of at least one of 3-chloropropyl trimethoxysilane and 3-isocyano propyl triethoxysilane and at least one of methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane and ethyltrimethoxysilane.
9. The optical adhesive for a vehicle-mounted touch plastic cover plate according to claim 1, wherein the (meth) acrylic copolymer is prepared by the following method:
s1, mixing 40-160g of ethyl acrylate, 27-108g of ethoxy ethyl acrylate, 9-36g of methyl methacrylate, 14-54g of hydroxybutyl acrylate, 24-96g of toluene, 45-180g of ethyl acetate and 24-96g of butanone, introducing nitrogen, stirring to remove air, heating to 60-75 ℃, then adding 0.12-0.5g of azo-diisobutyronitrile, and reacting for 1.5-6 hours;
s2, adding 27-108g of ethyl acrylate, 18-72g of ethoxyethoxy ethyl acrylate, 6-24g of methyl methacrylate, 8-36g of hydroxybutyl acrylate, 16-64g of toluene, 30-120g of ethyl acetate and 16-64g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.08-0.32g of azodiisobutyronitrile for reaction for 1.5-6 hours at 70-80 ℃; adding 0.3-1.2g of azodiisobutyronitrile, dripping 1-6g of polymerizable macromer, and reacting for 1-4 hours at 75-85 ℃ to obtain the (methyl) acrylic ester copolymer.
10. The optical adhesive for a vehicle-mounted touch plastic cover plate according to claim 1, wherein the (meth) acrylic copolymer is prepared by the following method:
s1, mixing 30-120g of butyl acrylate, 10-42g of isooctyl acrylate, 27-108g of ethoxyethoxy ethyl acrylate, 9-36g of methyl methacrylate, 14-54g of hydroxybutyl acrylate, 24-96g of toluene, 45-180g of ethyl acetate and 24-96g of butanone, introducing nitrogen, stirring to remove air, heating to 60-75 ℃, then adding 0.12-0.5g of azodiisobutyronitrile, and reacting for 1.5-6 hours;
s2, adding 21-84g of butyl acrylate, 5-24g of isooctyl acrylate, 18-72g of ethoxyethoxy ethyl acrylate, 6-24g of methyl methacrylate, 8-36g of hydroxybutyl acrylate, 16-64g of toluene, 30-120g of ethyl acetate and 16-64g of butanone into the product obtained in the step S1, uniformly stirring, and then adding 0.08-0.32g of azodiisobutyronitrile for reaction for 1.5-6 hours at 70-80 ℃; adding 0.3-1.2g of azodiisobutyronitrile, dripping 1-6g of polymerizable macromer, and reacting for 1-4 hours at 75-85 ℃ to obtain the (methyl) acrylic ester copolymer.
11. A method for preparing the optical cement for the vehicle-mounted touch plastic cover plate according to any one of claims 1 to 10, which is characterized by comprising the following steps:
mixing the (methyl) acrylic ester copolymer, the isocyanate crosslinking agent and the adhesive force modifier, stirring for 5-20min at the temperature of 20-35 ℃, vacuumizing, and standing until no bubble exists, thus obtaining the optical adhesive for the vehicle-mounted touch plastic cover plate.
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