CN112375515A - Adhesive and optical member protection sheet - Google Patents
Adhesive and optical member protection sheet Download PDFInfo
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- CN112375515A CN112375515A CN202011240930.6A CN202011240930A CN112375515A CN 112375515 A CN112375515 A CN 112375515A CN 202011240930 A CN202011240930 A CN 202011240930A CN 112375515 A CN112375515 A CN 112375515A
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- protective sheet
- acrylate
- crosslinking agent
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- 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
- C09J133/00—Adhesives 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
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
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- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- 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
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- 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
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- 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
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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- 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
- C09J2433/00—Presence of (meth)acrylic polymer
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- 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
Abstract
The invention relates to the field of protective films, in particular to an adhesive and an optical member protective sheet. The adhesive for the optical member protective sheet comprises 100 parts by weight of hydrophilic polyacrylate, 5-8 parts by weight of curing agent, 0.1-0.8 part by weight of antistatic agent, 0.05-0.3 part by weight of flatting agent, 1-5 parts by weight of plasticizer, 0.1-3 parts by weight of antioxidant and 0.01-0.1 part by weight of catalyst; wherein, the hydrophilic polyacrylate is polymerized by 75-90 parts of acrylic ester monomer containing alkoxy, 3-10 parts of alkyl acrylic ester crosslinking monomer, 1-5 parts of compound containing nitrogen heterocycle and 5-15 parts of methacrylate monomer containing polyethylene glycol chain segment. The optical member protective sheet containing the adhesive of the present invention is resistant to contamination, hardly causes component precipitation at high temperature and high humidity, is resistant to temperature, is scratch-resistant, and has a low film-tearing voltage.
Description
Technical Field
The invention relates to the field of protective films, in particular to an adhesive and an optical member protective sheet.
Background
Optical members such as touch panel sensors and polarizing plates are susceptible to damage or contamination during processing and transportation, and a protective film can be attached to the surface of the optical members so as not to be damaged, and can be removed at any time when surface protection is not required.
At present, the optical member and the protective film on the surface thereof are made of plastic materials, static electricity is generated due to friction in the transportation and peeling stages, and the circuit of the optical member is broken down due to excessive static electricity, so that the optical member is damaged. In addition, the optical member protective film is required to have low dusting and no precipitation of components in the protective film under high temperature and high humidity conditions to protect the optical member from contamination. The adhesive in the protective sheet for optical members is usually formulated from polyurethane, which is expensive and causes contamination of optical members due to the tendency of various components in the formulation to precipitate under high temperature and high humidity conditions. The optical component protection sheet adopting the acrylic as the adhesive has serious acrylic dusting and high film tearing voltage, and can cause pollution and damage to the optical component.
Disclosure of Invention
In order to solve the above-mentioned problems, an object of the present invention is to provide an adhesive and an optical member protective sheet, the optical member protective sheet containing the adhesive of the present invention is resistant to contamination, hardly causes component precipitation at high temperature and high humidity, is resistant to temperature and scratch, and has a low peeling voltage.
A first object of the present invention is to provide an adhesive for an optical member protective sheet, characterized in that: comprises 100 weight portions of hydrophilic polyacrylate, 5 to 8 weight portions of curing agent, 0.1 to 0.8 weight portion of antistatic agent, 0.05 to 0.3 weight portion of flatting agent, 1 to 5 weight portions of plasticizer, 0.1 to 3 weight portions of antioxidant and 0.01 to 0.1 weight portion of catalyst;
wherein, the hydrophilic polyacrylate is polymerized by 75-90 parts of acrylic ester monomer containing alkoxy, 3-10 parts of alkyl acrylic ester crosslinking monomer, 1-5 parts of compound containing nitrogen heterocycle and 5-15 parts of methacrylate monomer containing polyethylene glycol chain segment.
Further, the acrylic ester monomer containing alkoxy is selected from acrylic acid alkoxyalkyl ester or methacrylic acid alkoxyalkyl ester. The acrylic acid alkoxy alkyl ester is selected from one or more of 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, methoxytriethylene glycol acrylate, 3-methoxypropyl acrylate, 3-ethoxypropyl acrylate, 4-methoxybutyl acrylate and 4-ethoxybutyl acrylate. The alkoxyalkyl methacrylate is selected from one or more of 2-methoxyethyl methacrylate, 2-ethoxyethyl methacrylate, methoxytriethylene glycol methacrylate, 3-methoxypropyl methacrylate, 3-ethoxypropyl methacrylate, 4-methoxybutyl methacrylate and 4-ethoxybutyl methacrylate. Among them, alkoxyalkyl acrylate is preferable, and 2-methoxyethyl acrylate (MEA) is more preferable. According to the weight, the preferred proportion of the acrylic ester monomer containing alkoxy in the adhesive is 75-90 parts, the dosage is less than 75 parts, the durability and toughness of the colloid are insufficient, and the scratch-resistant effect is poor. When the amount of the polymer is more than 90 parts, the cohesion of the colloid is deteriorated, and the environment measurement and temperature resistance effects are reduced.
Further, the alkyl acrylate crosslinking monomer is selected from polar group-containing acrylate monomers, which may improve the adhesive force or may increase the cohesive force of the pressure-sensitive adhesive composition. From the viewpoint of improving the adhesive property and improving the heat resistance by increasing the crosslinking point for effective crosslinking, preferred are hydroxyl group-containing alkyl acrylate monomers such as hydroxyalkyl (meth) acrylates including one or more of 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate and 6-hydroxyhexyl (meth) acrylate. Further, from the viewpoint of high crosslinking rate and productivity advantage, 2-hydroxyethyl acrylate (HEA) and 4-hydroxybutyl acrylate (4HBA) are more preferable. The alkyl acrylate crosslinking monomer is preferably used in an amount of 3 to 10 parts by weight, and less than 3 parts by weight, and the crosslinking is insufficient, so that the durability under high temperature and high humidity and the adhesive property cannot be satisfied. If the amount is more than 10 parts, the durability at high temperature cannot be satisfied.
Further, the nitrogen-containing heterocyclic compound is a compound composed of an acrylate double bond and one nitrogen-containing heterocyclic group, preferably selected from ureido methacrylate compounds, such as commercially available PennaOf dditives Ltd
WAM X can improve the adhesion to a base material and the cohesion of colloid, and has good water resistance. The preferable proportion of the nitrogen heterocyclic ring-containing compound in the adhesive is 1 to 5 parts by weight, the amount is less than 1 part by weight, the adhesion to the substrate is poor, the scratch resistance is poor, and the high temperature durability cannot be satisfied. When the amount of the rubber is more than 5 parts, the rubber becomes hard and is easy to powder, and the scratch resistance is also not satisfied.
Further, the molecular weight of the polyethylene glycol segment of the methacrylate monomer containing the polyethylene glycol segment is 100-1000, the methacrylate monomer containing the polyethylene glycol segment is selected from one or more of methoxy diethylene glycol methacrylate, methoxy diethylene glycol 230 methacrylate, methoxy polyethylene glycol 350 methacrylate, methoxy polyethylene glycol 400 methacrylate, methoxy polyethylene glycol 550 methacrylate, methoxy polyethylene glycol 600 methacrylate, methoxy polyethylene glycol 800 methacrylate and methoxy polyethylene glycol 1000 methacrylate, wherein the methoxy polyethylene glycol 400 methacrylate and the methoxy polyethylene glycol 550 methacrylate are more preferable. The preferable proportion of the methacrylate monomer containing the polyethylene glycol chain segment in the adhesive is 5-15 parts, the dosage is less than 5 parts, the high-temperature high-humidity ring test effect is poor, and the electrostatic pressure of the torn film is high. When the amount is more than 15 parts, the cohesion of the colloid is insufficient, and the high-temperature durability is poor.
Further, the molecular weight of the hydrophilic polyacrylate is 50 to 120 ten thousand, and PDI is 4 to 8. Too low molecular weight, poor cohesion; the molecular weight distribution is too wide, the proportion of small molecules is large, and the temperature resistance and the pollution resistance are poor. The molecular weight is too high, the crosslinking density is too high after the colloid is crosslinked, the scratch resistance effect is poor, and the powder is easy to generate. .
Further, the curing agent is selected from one or more of the group consisting of an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, a melamine-based crosslinking agent, a peroxide-based crosslinking agent, a urea-based crosslinking agent, a metal alkoxide-based crosslinking agent, a metal complex-based crosslinking agent, a metal salt-based crosslinking agent, a carbodiimide-based crosslinking agent, an oxazoline-based crosslinking agent, an aziridine-based crosslinking agent, and an amine-based crosslinking agent. Preference is given to crosslinking agents based on isocyanates.
Examples thereof include, as the isocyanate-based crosslinking agent, lower aliphatic polyisocyanates such as 1, 2-ethylene diisocyanate, 1, 4-butylene diisocyanate and 1, 6-Hexamethylene Diisocyanate (HDI); alicyclic polyisocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate and hydrogenated xylene diisocyanate; aromatic polyisocyanates such as 2, 4-tolylene diisocyanate, 2, 6-tolylene diisocyanate, 4' -diphenylmethane diisocyanate and Xylylene Diisocyanate (XDI). Among them, HDI or polyfunctional HDI (hereinafter referred to as "HDI-based crosslinking agent") and an adduct of HDI and a polyol are preferable from the viewpoint of adhesive properties. The isocyanate-based crosslinking agent may be, for example, a commercially available product such as a trimethylolpropane/tolylene diisocyanate adduct (manufactured by Nippon Polyurethane Industry co., Ltd.) under the trade name "CORONATE L"), a trimethylolpropane/hexamethylene diisocyanate adduct (manufactured by japan Polyurethane Industry co., under the trade name "CORONATE HL", a polyfunctional HDI (manufactured by japan Polyurethane Industry co., Ltd.) (under the trade name "CORONATE 90B", manufactured by japan Polyurethane Industry co.).
Further, the antistatic agent is selected from ionic compounds including alkali metal salts and/or ionic liquids. By containing these ionic compounds, excellent antistatic properties can be imparted. The antistatic agent is preferably one or more of lithium bistrifluoromethanesulfonimide (LiTFSI), pyridinium and piperidinium salts. The pressure-sensitive adhesive layer (using the antistatic component) obtained by crosslinking the pressure-sensitive adhesive composition containing an antistatic agent as described above can realize antistatic properties for an adherend (for example, a mobile phone screen) which is not subjected to antistatic properties at the time of peeling, and therefore, is a surface protective film which reduces contamination of the adherend.
Further, the pyridinium salt is selected from the group consisting of 1-ethylpyridinium cation, 1-butylpyridinium cation, 1-hexylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-butyl-4-methylpyridinium cation, 1-hexyl-3-methylpyridinium cation, and 1-butyl-3, 4-dimethylpyridinium cation. The piperidinium salt is selected from the group consisting of a 1-propylpiperidinium cation, a 1-pentylpiperidinium cation, a1, 1-dimethylpiperidinium cation, a 1-methyl-1-ethylpiperidinium cation, a 1-methyl-1-propylpiperidinium cation, a 1-methyl-1-butylpiperidinium cation, a 1-methyl-1-pentylpiperidinium cation, a 1-methyl-1-hexylpiperidinium cation, a 1-methyl-1-heptylpiperidinium cation, a 1-ethyl-1-propylpiperidinium cation, a 1-ethyl-1-butylpiperidinium cation, a 1-ethyl-1-pentylpiperidinium cation, a 1-ethyl-1-hexylpiperidinium cation, a salt of a carboxylic acid with a carboxylic acid, a salt of a carboxylic acid, 1-ethyl-1-heptylpiperidinium cation, 1-dipropylpiperidinium cation, 1-propyl-1-butylpiperidinium cation, 1-dibutylpiperidinium cation.
Further, the leveling agent is selected from silicone and/or fluorine-containing oligomer.
Preferably, the leveling agent is one or more selected from X-22-176F, BYK-377 and OFX 0400.
Further, the plasticizer is an antistatic plasticizer containing a plurality of long carbon chain ether linkages, preferably selected from dibutyloxyethyl phthalate, such as C-1000 or C-1100, commercially available as new Japan physicochemical.
Further, the antioxidant is selected from one or more of antioxidants 1010, 1076, 168 and 565.
Further, the catalyst is selected from tin-based catalysts such as dibutyltin dilaurate and dioctyltin dilaurate, tris (acetylacetonato) iron, tris (hexane-2, 4-diketonate) iron, tris (heptane-3, 5-diketonate) iron, tris (5-methylhexane-2, 4-diketonate) iron, tris (octane-2, 4-diketonate) iron, tris (6-methylheptane-2, 4-diketonate) iron, tris (2, 6-dimethylgentane-3, 5-diketonate) iron, tris (nonane-2, 4-diketonate) iron, tris (nonane-4, 6-diketonate) iron, tris (2, 2,6, 6-tetramethylheptane-3, 5-diketonate) iron, tri (tridecane-6, 8-diketonate) iron, tri (1-phenylbutane-1, 3-diketonate) iron, tri (hexafluoroacetylacetonato) iron, tri (ethylacetoacetate) iron, tri (n-propyl acetoacetate) iron, tri (isopropyl acetoacetate) iron and other iron-based catalysts, and one or more of an organic bismuth catalyst, an organic zirconium catalyst, an organic zinc catalyst and an organic aluminum catalyst.
A second object of the present invention is to provide a protective sheet for optical members, which comprises a release film layer, an adhesive layer and a base material layer, the release film layer, the adhesive layer and the base material layer being arranged in this order, wherein the adhesive layer comprises the adhesive for protective sheets for optical members of the present invention.
Further, the material of the release film layer is selected from PET; the material of the substrate layer is selected from PET.
Further, the thickness of the adhesive layer is 5-20 μm, and the thickness of the base material layer is 25-75 μm.
By the scheme, the invention at least has the following advantages:
the adhesive disclosed by the invention uses polyacrylate with good scratch resistance, high temperature and high humidity resistance and strong hydrophilicity, and alkoxy-containing acrylate polymerization units are introduced into the resin, so that the adhesive has good water absorption and elasticity, good high temperature and high humidity performance and good scratch resistance; the introduction of the nitrogen heterocyclic compound can improve the temperature resistance of the colloid and the adhesive force of the base material; the polyethylene glycol chain segment in the methacrylate containing the polyethylene glycol chain segment has good hydrophilicity and electrostatic elimination effect. The adhesive disclosed by the invention is also added with an antioxidant, so that the temperature resistance and environment measurement effects are improved cooperatively, meanwhile, the antistatic agent can effectively reduce the electrostatic voltage of the torn film, and the leveling agent can effectively level the adhesive surface and reduce the stripping force and the friction force during tearing, so that the voltage of the torn film is reduced; the addition of the plasticizer containing ether bonds can effectively reduce the tear film voltage so as to achieve the tear film electrostatic voltage of less than 300V on the screen. The adhesive of the invention has obvious improvement effect on the performances of film tearing voltage, environment measurement, temperature resistance, scratch resistance, antifouling and the like of an optical member protection sheet.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following description is made with reference to the preferred embodiments of the present invention and the accompanying detailed drawings.
Drawings
FIG. 1 is a schematic view showing the structure of a protective sheet for an optical member according to the present invention;
description of reference numerals:
1-a release film layer; 2-an adhesive layer; 3-a substrate layer.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Examples 1 to 9 and comparative examples 1 to 7
Examples and comparative examples each provide an optical member protective sheet including a release film layer, an adhesive layer, and a substrate layer, which are sequentially disposed. Wherein, the release film layer is made of PET and has a thickness of 38 μm. The material of the substrate layer is PET, and the thickness is 50 μm.
The thickness of the adhesive layer was 10 μm, and the adhesive layer was obtained by coating the adhesive prepared by the formulation shown in table 1. Specifically, the process for producing the optical member protective sheet is as follows:
the synthesis method of the polyacrylate used is as follows:
(1) synthesis example A1
According to the mass ratio of MEA (2-methoxyethyl acrylate), 4HBA (4-hydroxybutyl acrylate), WAM X (ureido methacrylate compound) and M-90G (methoxy polyethylene glycol 400 methacrylate) of 85:6:3:6, the corresponding monomers were weighed out to give a total weight of 100G. The monomer was charged into a 1L reactor, 150g of ethyl acetate, 0.2 part of initiator, and nitrogen purged at 25 ℃ for 1 hour, and then heated to 65 ℃ for 4 hours. And heating to 75 ℃, preserving the temperature for 3h, and adding toluene for dilution to obtain a glue solution with the solid content of 35%, wherein the glue solution contains polyacrylate, the weight average molecular weight Mw of the glue solution is 70 ten thousand, and the PDI of the glue solution is 5.5.
(2) Synthesis examples A2-A5 and comparative examples B1-B3
By controlling the synthesis conditions and adjusting the amounts of the monomers in the proportions shown in Table 1, polyacrylate solutions A2-A5 and B1-B3 used in the examples and comparative examples shown in Table 2 were obtained.
TABLE 1 molecular weights and PDI of monomers and polyacrylates for the synthesis of polyacrylate solutions
According to the formula in table 2, a certain amount of curing agent, antistatic agent, antioxidant, leveling agent, plasticizer, catalyst and other auxiliaries are added into the glue, and the mixture is uniformly stirred to obtain the adhesive. Wherein the glue is synthetic example A1-A5 and comparative example B1-B3. Defoaming the adhesive, coating the adhesive with the thickness of 10 microns on a transparent PET substrate with the thickness of 50 microns, drying for 3min at 90 ℃, attaching a release film with the thickness of 38 microns on the other surface of the adhesive after drying, and curing for 48h at 50 ℃ to finish the preparation of the sample.
The performance tests of the various protective sheets for optical members were carried out according to table 2, and the results are shown in table 2.
TABLE 2 formulation of adhesive and results of performance test of protective sheet for optical member
All materials in table 2 were used in mass units. C-1000 in Table 2 is dibutyloxyethyl phthalate, purchased from New Japan chemical and physical Co. In Table 2, the pyridinium salt was specifically 1-butyl-3-methylpyridinium trifluoromethanesulfonic acid. The piperidine salt is specifically methylpropylpiperidine bis-fluorosulfonylimide. Other materials are commercially available, in a number commonly recognized in the art as such and from sources.
In table 2, peel force test method: see GB/T2792-;
the tearing voltage test method comprises the following steps: attaching the optical member protection sheet to an AF screen, fixing an electrostatic field instrument on the machine, placing a sample at a position 10cm below the instrument, peeling the optical member protection sheet from the AF screen at a speed of 20cm/s, and recording electrostatic pressure of a torn film;
the high-temperature high-humidity environment measurement method comprises the following steps: attaching the optical member protection sheet on an AF screen, placing in an environment measuring machine with 85 ℃ RH multiplied by 85% RH for 7 days, taking out, placing at room temperature for 30min, testing 180-degree stripping force, and observing whether the AF screen has residual glue or white fog;
in the results of the contamination test in Table 2, the meaning of O is no adhesive residue and no contamination; Δ means slight white haze, ghosting; the meaning of x is a clear white haze.
The temperature resistance test method comprises the following steps: attaching the optical member protection sheet on an AF screen, placing the AF screen in a 180 ℃ oven for treatment for 2h, taking out the AF screen, placing the AF screen at room temperature for 30min, stripping the optical member protection sheet, and observing whether the AF screen has residual glue or offset glue;
in the results of the temperature resistance test in Table 2, the meaning of O is no adhesive residue and no pollution; the meaning of delta is dotted gum residue, ghost; the meaning of x is severe cull.
Scratch resistance test method: the optical member protective sheet was stuck to the AF screen, and the film surface was scratched with a fingernail or with a key to observe whether there was powder falling on the screen.
Table 2 scratch resistance results, o means no dusting; the meaning of Δ is moderate dusting; the meaning of x is severe dusting.
When the polyacrylate A is prepared, an MEA monomer is used, so that the polyacrylate A has good water absorption and elasticity, good high-temperature and high-humidity performance and good scratch resistance; the WAMX is introduced, so that the temperature resistance of the colloid and the adhesive force to a base material can be improved; M-90G contains polyethylene glycol chain segments, and has good hydrophilicity and electrostatic elimination effect; the addition of a plasticizer having a multi-ether bond can reduce initial tack and significantly reduce tear voltage. As can be seen from table 2, comparing comparative example 1 to comparative example 4, it can be seen that the incorporation of a sufficient amount of MEA into the adhesive enables significant improvement in high temperature and high humidity loop test, high temperature durability, and scratch resistance.
Comparing example 1 with comparative example 1 and comparative example 3, it can be seen that the voltage for tearing the film by adding the plasticizer C1000 is obviously reduced, the ring test of excessive plasticizer at high temperature and high humidity, high temperature durability and scratch resistance effect are poor, and the climbing of the peeling force at the ring test is obvious. Comparing example 3 with comparative example 5, the addition of the methacrylate urea ester compound can obviously improve the temperature resistance of the colloid, reduce the transfer of the high-temperature high-humidity environment to a back sticker, has lower climbing force, obviously improves the adhesive force to the substrate and improves the scratch-resistant effect;
comparing example 5 with comparative example 6, it can be seen that when M-90G is increased to a certain amount, the tearing voltage is obviously increased, the molecular weight of the colloid is too high, the scratch resistance effect is poor, the molecular weight distribution is too wide, the number of small molecules is large, and the high-temperature high-humidity environment measurement effect is influenced to a certain extent.
Comparing example 1 with comparative example 2, it was found that the addition of the leveling agent significantly improved the tear voltage and reduced the initial peel force.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An adhesive for an optical member protective sheet, characterized in that: comprises 100 weight portions of hydrophilic polyacrylate, 5 to 8 weight portions of curing agent, 0.1 to 0.8 weight portion of antistatic agent, 0.05 to 0.3 weight portion of flatting agent, 1 to 5 weight portions of plasticizer, 0.1 to 3 weight portions of antioxidant and 0.01 to 0.1 weight portion of catalyst;
wherein, the hydrophilic polyacrylate is polymerized by 75-90 parts of acrylic ester monomer containing alkoxy, 3-10 parts of alkyl acrylic ester crosslinking monomer, 1-5 parts of compound containing nitrogen heterocycle and 5-15 parts of methacrylate monomer containing polyethylene glycol chain segment.
2. The adhesive for an optical member protective sheet according to claim 1, wherein: the acrylic ester monomer containing the alkoxy is selected from one or more of 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, methoxytriethylene glycol (meth) acrylate, 3-methoxypropyl (meth) acrylate, 3-ethoxypropyl (meth) acrylate, 4-methoxybutyl (meth) acrylate and 4-ethoxybutyl (meth) acrylate.
3. The adhesive for an optical member protective sheet according to claim 1, wherein: the alkyl acrylate crosslinking monomer is selected from acrylate monomers containing polar groups.
4. The adhesive for an optical member protective sheet according to claim 1, wherein: the nitrogen-containing heterocyclic compound is a compound consisting of an acrylate double bond and a nitrogen-containing heterocyclic group.
5. The adhesive for an optical member protective sheet according to claim 1, wherein: the molecular weight of the polyethylene glycol segment of the methacrylate monomer containing the polyethylene glycol segment is 100-1000, and the methacrylate monomer containing the polyethylene glycol segment is selected from methoxy diethylene glycol methacrylate and/or methoxy polyethylene glycol methacrylate.
6. The adhesive for an optical member protective sheet according to claim 1, wherein: the curing agent includes one or more of an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, a melamine-based crosslinking agent, a peroxide-based crosslinking agent, a urea-based crosslinking agent, a metal alkoxide-based crosslinking agent, a metal complex-based crosslinking agent, a metal salt-based crosslinking agent, a carbodiimide-based crosslinking agent, an oxazoline-based crosslinking agent, an aziridine-based crosslinking agent, and an amine-based crosslinking agent.
7. The adhesive for an optical member protective sheet according to claim 1, wherein: the antistatic agent is selected from ionic compounds including alkali metal salts and/or ionic liquids.
8. The adhesive for an optical member protective sheet according to claim 1, wherein: the leveling agent is selected from organosilicon and/or fluorine-containing oligomer.
9. The adhesive for an optical member protective sheet according to claim 1, wherein: the plasticizer is an antistatic plasticizer containing a plurality of long carbon chain ether bonds; the antioxidant is selected from one or more of antioxidants 1010, 1076, 168 and 565.
10. An optical member protective sheet comprising a release film layer, an adhesive layer and a base material layer provided in this order, wherein the adhesive layer comprises the adhesive for optical member protective sheet according to any one of claims 1 to 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115785884A (en) * | 2023-01-29 | 2023-03-14 | 太仓斯迪克新材料科技有限公司 | Adhesive for electrostatic protection film and electrostatic protection film with ultralow film tearing voltage |
| CN115820169A (en) * | 2022-01-07 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Adhesive, adhesive tape, preparation method of adhesive tape and electrochemical device |
| CN117555060A (en) * | 2024-01-11 | 2024-02-13 | 宁波长阳科技股份有限公司 | Coated reflecting film based on multi-morphology particle coating and preparation method thereof |
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| CN104673142A (en) * | 2013-11-29 | 2015-06-03 | 藤森工业株式会社 | Adhesive composition and surface protection film |
| JP2015157883A (en) * | 2014-02-21 | 2015-09-03 | 藤森工業株式会社 | Adhesive composition and surface protective film |
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| CN104673142A (en) * | 2013-11-29 | 2015-06-03 | 藤森工业株式会社 | Adhesive composition and surface protection film |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115820169A (en) * | 2022-01-07 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Adhesive, adhesive tape, preparation method of adhesive tape and electrochemical device |
| CN115820169B (en) * | 2022-01-07 | 2024-03-26 | 宁德时代新能源科技股份有限公司 | Adhesive, adhesive tape, preparation method of adhesive and adhesive tape and electrochemical device |
| CN115785884A (en) * | 2023-01-29 | 2023-03-14 | 太仓斯迪克新材料科技有限公司 | Adhesive for electrostatic protection film and electrostatic protection film with ultralow film tearing voltage |
| CN115785884B (en) * | 2023-01-29 | 2023-05-12 | 太仓斯迪克新材料科技有限公司 | Adhesive for electrostatic protection film and electrostatic protection film with ultralow film tearing voltage |
| CN117555060A (en) * | 2024-01-11 | 2024-02-13 | 宁波长阳科技股份有限公司 | Coated reflecting film based on multi-morphology particle coating and preparation method thereof |
| CN117555060B (en) * | 2024-01-11 | 2024-04-02 | 宁波长阳科技股份有限公司 | Coated reflecting film based on multi-morphology particle coating and preparation method thereof |
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Application publication date: 20210219 |