CN114644900B - UV (ultraviolet) viscosity reducing composition, UV viscosity reducing adhesive tape and method for preparing UV viscosity reducing adhesive tape - Google Patents

UV (ultraviolet) viscosity reducing composition, UV viscosity reducing adhesive tape and method for preparing UV viscosity reducing adhesive tape Download PDF

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Publication number
CN114644900B
CN114644900B CN202210354347.0A CN202210354347A CN114644900B CN 114644900 B CN114644900 B CN 114644900B CN 202210354347 A CN202210354347 A CN 202210354347A CN 114644900 B CN114644900 B CN 114644900B
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adhesive
layer
curing
substrate layer
adhesive tape
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CN114644900A (en
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张鹤荣
刘瀛
许士鲁
李永杰
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China Lucky Group Corp
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China Lucky Group Corp
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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
    • 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
    • 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
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
    • 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

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention discloses a UV (ultraviolet) viscosity reducing composition, a UV viscosity reducing adhesive tape and a method for preparing the UV viscosity reducing adhesive tape, wherein the UV viscosity reducing composition comprises the following components: 50-100 parts by weight of acrylic pressure-sensitive adhesive containing carboxyl, 2-50 parts by weight of polyfunctional acrylic compound, 1-20 parts by weight of auxiliary agent, 0.001-0.5 part by weight of curing accelerator and 0.1-3 parts by weight of photoinitiator; wherein the auxiliary agent contains active groups, and the active groups comprise at least one of epoxy groups and amino groups. Therefore, the components are mutually supported and matched functionally, so that the double bond grafting effect on the side chain of the pressure-sensitive adhesive can be achieved in the curing process of the composition, the purposes of increasing the molecular weight and reducing the residual adhesive are achieved, and the method has the advantages of simple process, energy conservation, long storage time and the like.

Description

UV (ultraviolet) viscosity reducing composition, UV viscosity reducing adhesive tape and method for preparing UV viscosity reducing adhesive tape
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a UV (ultraviolet) viscosity-reducing composition, a UV viscosity-reducing adhesive tape and a method for preparing the UV viscosity-reducing adhesive tape.
Background
With the development of electronic products, UV visbreaking tapes used in the processing process are also getting more attention and demands. The adhesive tape is required to have high adhesive force in cutting, so that products are prevented from falling off and scattering, and breakage in cutting is reduced; meanwhile, the viscosity of the adhesive tape is reduced after UV irradiation, and the product is easy to pick up.
The UV anti-sticking adhesive tape generally comprises a protective film, a UV anti-sticking adhesive layer and a substrate three-layer structure, when products such as glass and the like are required to be fixedly protected, the protective film of the UV anti-sticking adhesive tape is uncovered, the UV anti-sticking adhesive layer is stuck and fixed on the products, and the operation process is simple. The UV-curable adhesive layer is reduced in tackiness after UV (ultraviolet) irradiation, and the UV-curable adhesive tape is removed from a glass or the like after UV irradiation. The UV visbreaking adhesive tape requires a large viscosity drop after UV irradiation, and has few or no residual adhesive on the product. Most of the UV anti-adhesive layers in the market adopt a compounding method, and residual adhesive can appear on products such as glass and the like.
Therefore, there is a need for an improved UV reducing adhesive tape.
Disclosure of Invention
The inventors have found that conventional UV-reducing adhesives are generally achieved in two ways: the first method is that macromolecular pressure-sensitive adhesive with double bonds in side chains is used as UV (ultraviolet) glue reducing adhesive, and under the condition of UV light irradiation, the double bonds are crosslinked to generate a crosslinked network structure, so that the photo-curing effect is realized; and secondly, adopting a compounding method, doping a light curing component into the pressure-sensitive adhesive, and realizing a light curing effect under the condition of UV light irradiation. The first mode has the problems of complex process, higher energy consumption, potential safety hazard and the like; in the second mode, the molecular weight is not large enough due to excessive small molecular substances, and the small molecular substances migrate along with the extension of time, so that residual glue is easy to appear, and in addition, the problem of compounding compatibility also needs to be considered in the second mode. That is, the existing UV-reducing adhesives have defects, and it would be of great importance if a UV-reducing adhesive could be provided that ameliorates the above-mentioned defects.
In view of this, the present invention provides a UV-reducing composition comprising: 50-100 parts by weight of acrylic pressure-sensitive adhesive containing carboxyl, 2-50 parts by weight of polyfunctional acrylic compound, 1-20 parts by weight of auxiliary agent, 0.001-0.5 part by weight of curing accelerator and 0.1-3 parts by weight of photoinitiator; wherein the auxiliary agent contains active groups, and the active groups comprise at least one of epoxy groups and amino groups. Therefore, the components are mutually supported and matched functionally, so that the double bond grafting effect on the side chain of the pressure-sensitive adhesive can be achieved in the curing process of the composition, the purposes of increasing the molecular weight and reducing the residual adhesive are achieved, and the method has the advantages of simple process, energy conservation, long storage time and the like.
According to an embodiment of the present invention, in the polyfunctional acrylate compound, the functional group corresponding to the functionality is a carbon-carbon double bond, and the functionality is 2 or more. Therefore, the carbon-carbon double bond in the polyfunctional acrylate compound can be subjected to polymerization reaction through photoinitiation to form a crosslinked network structure, so that the effect of reducing viscosity after UV irradiation can be achieved, and the residual glue is further reduced.
According to the embodiment of the invention, the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 5-100mgKOH/g.
Further, the multi-functionality acrylate compound includes at least one of dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and two or more functionality urethane acrylate polymers.
Further, the auxiliary agent comprises at least one of glycidyl acrylate and glycidyl methacrylate.
According to an embodiment of the present invention, the curing agent includes at least one of a metal ion curing agent, an aziridine-based curing agent, an isocyanate-based curing agent, an amine-based curing agent, and an epoxy-based curing agent.
According to an embodiment of the present invention, the curing accelerator includes at least one of triethylamine, benzyl dimethylamine, pyridine, dicycloamidine, N-diglycidyl aniline, benzyl triphenylphosphine bromide, triphenylphosphine, triphenylantimony, chromium acetylacetonate, tetraethylammonium bromide, 2,4, 6-tris (dimethylaminomethyl) phenol.
According to an embodiment of the invention, the photoinitiator comprises at least one of 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-methylphenyl propane-1-one, 2-methyl-1- (4-methylthiophenyl) -2-morpholino-1-propanone, benzoin dimethyl ether, benzophenone, 2-isopropylthioxanthone, 2,4,6- (trimethylbenzoyl) -diphenylphosphine oxide, 2,4,6- (trimethylbenzoyl) -phosphonic acid ethyl ester.
The invention also provides a UV-curable adhesive tape comprising a substrate layer, a UV-curable adhesive layer and a release film layer which are arranged in a stacked manner, wherein the UV-curable adhesive layer is formed by the UV-curable adhesive composition. Thus, the UV reducing adhesive tape has all of the features and advantages of the UV reducing composition described above and will not be described in detail herein.
According to an embodiment of the present invention, the material forming the substrate layer comprises at least one of PET, PO, PVC, EVA; the material forming the release film layer comprises PET.
The present invention also provides a method of preparing the UV-tack-reducing tape described hereinbefore, the method comprising: coating the UV anti-adhesion composition on a substrate layer, and drying after coating, so as to form a UV anti-adhesion layer on the surface of the substrate layer; and attaching a release film layer on the surface of one side of the UV anti-adhesive layer, which is far away from the substrate layer, and curing to obtain the UV anti-adhesive tape. Thus, the method has all of the features and advantages of the UV reduction tape described above and will not be described in detail herein.
According to the embodiment of the invention, the drying temperature is 70-100 ℃, and the drying time is 2-3 minutes; the curing temperature is 25-60 ℃, and the curing time is 2-7 days.
Drawings
FIG. 1 is a schematic view of the structure of a UV curable adhesive tape of the present application;
FIG. 2 is a flow chart of a method of making a UV curable adhesive tape in accordance with one embodiment of the application.
Description of the reference numerals
100-substrate layer, 200-UV anti-adhesive layer and 300-release film layer.
Detailed Description
Embodiments of the present application are described in detail below. The following examples are illustrative only and are not to be construed as limiting the application. The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product. The reagents used were conventional products commercially available without the manufacturer's knowledge.
To improve the above technical problem, the present application provides a UV-reducing composition, which includes: 50-100 parts by weight of acrylic pressure-sensitive adhesive containing carboxyl, 2-50 parts by weight of polyfunctional acrylic compound, 1-20 parts by weight of auxiliary agent, 0.001-0.5 part by weight of curing accelerator and 0.1-3 parts by weight of photoinitiator; wherein the auxiliary agent contains active groups, and the active groups comprise at least one of epoxy groups and amino groups. Therefore, in the curing process, the acrylic acid ester pressure-sensitive adhesive containing carboxyl can react with the auxiliary agent, namely, the carboxyl in the pressure-sensitive adhesive can react with active groups in the auxiliary agent, under the action of a curing agent and a curing accelerator, the system forms the acrylic acid ester pressure-sensitive adhesive with larger molecular weight and double bonds on side chains, the purpose of increasing the molecular weight can be achieved, and then a cross-linking structure is formed rapidly through UV irradiation, so that quick viscosity reduction is realized, and residual glue is reduced. In addition, the method has the advantages of simple process, energy conservation, long storage time and the like, and overcomes the defects of high energy consumption, more residual glue and the like in the existing scheme.
It should be noted that the components in the UV-reducing composition are functionally supported and matched with each other, and a better reducing effect and a reducing effect of the residual glue can be achieved only when the content of each component is within the specific content defined in the foregoing description.
Specifically, the content of the acrylic pressure-sensitive adhesive containing carboxyl is 50-100 parts by weight, the acrylic pressure-sensitive adhesive in the range can provide a main body of an anti-adhesive layer, and the carboxyl contained in the acrylic pressure-sensitive adhesive is on a side chain of a long-chain structure of the acrylic pressure-sensitive adhesive and can react with other functional groups to realize the purpose of grafting double bonds on the side chain. If the content of the pressure-sensitive adhesive is too low, the whole molecular weight of the anti-adhesive layer is smaller, the cohesive force is insufficient, and residual adhesive is caused; if the pressure-sensitive adhesive is too high, the total double bond content of the anti-adhesive layer is insufficient, and the stripping force after UV is large.
The content of the polyfunctional acrylate compound is 2 to 50 parts by weight, and the polyfunctional acrylate compound within this range may provide sufficient carbon-carbon double bonds to carry out the photo-curing reaction. If the content of the polyfunctional acrylate compound is too low, the glass transition temperature of the whole anti-adhesive layer is low, and the stripping force after UV is large; if the content of the polyfunctional acrylate compound is too high, the viscosity-reducing layer is likely to have too much small molecular weight substances and insufficient cohesive force, resulting in residual adhesive.
The content of the auxiliary agent is 1-20 parts by weight, the auxiliary agent contains active groups, and the auxiliary agent in the range can provide proper active groups to carry out grafting reaction with carboxyl in the pressure-sensitive adhesive, so that the effect of grafting carbon-carbon double bonds on side chains is achieved. If the content of the auxiliary agent is too low, carboxyl in the acrylate pressure-sensitive adhesive does not completely participate in the grafting reaction, and the stripping force after UV is larger; if the content of the auxiliary agent is too high, an excessive amount of auxiliary agent small molecules exist in the adhesive layer, resulting in residual adhesive.
The content of the curing agent is 0.001-0.5 weight part, and the curing agent in the range can ensure that carboxyl which does not react with the auxiliary agent containing active groups in the pressure-sensitive adhesive can react with the curing agent, increase cohesive force of the adhesive layer and control the stripping force. If the content of the curing agent is too low, insufficient cohesive force of the adhesive layer can be caused, and residual adhesive is easy to appear; if the content of the curing agent is too high, the whole adhesive layer is hard, and the stripping force before UV is too low, so that the use requirement cannot be met.
The content of the curing accelerator is 0.001 to 0.5 parts by weight, and the curing accelerator in this range can appropriately increase the progress of the curing reaction, promote the grafting reaction, and shorten the curing time. If the content of the curing accelerator is too low, the reaction time is longer, and the grafting rate is lower; if the content of the curing accelerator is too high, the reaction is too fast, the effective use time of the glue solution is short, the coating is not easy, and small molecule residues are formed by the excessive curing accelerator, so that the residual glue is caused.
The content of the photoinitiator is 0.1-3 parts by weight, and the photoinitiator in the range can initiate the system to generate photo-curing reaction under the proper illumination energy, so that the viscosity reducing effect is realized. If the content of the photoinitiator is too low, the initiation efficiency is too low, the photo-curing reaction is insufficient, and the stripping force after UV is large; if the content of the photoinitiator is too high, an excessive amount of photoinitiator remains in the form of small molecules on the adhesive layer, resulting in adhesive residue.
According to an embodiment of the present invention, in the polyfunctional acrylate compound, the functional group corresponding to the functionality is a carbon-carbon double bond, and the functionality is 2 or more. Therefore, the carbon-carbon double bond in the polyfunctional acrylate compound can undergo polymerization reaction by photoinitiation, and after further polymerization, a network structure can be formed, so that the viscosity reduction effect is achieved. If the functionality is too low, the content of carbon-carbon double bonds is small, which results in insignificant decrease of peel force after photo-curing and poor reduction of residual gum.
The polyfunctional acrylate compound may be a monomer or a polymer. Specifically, the polyfunctional acrylate compound may be a polyfunctional acrylate polymer or a polyfunctional acrylate monomer.
In the curing process, carboxyl in the pressure-sensitive adhesive can react with active groups in the auxiliary agent, and double bonds are grafted on side chains of the pressure-sensitive adhesive, so that the purposes of increasing molecular weight and reducing residual adhesive of the UV viscosity-reducing composition are realized. The invention realizes crosslinking in the UV irradiation process, has simple process, saves energy and has longer storage time.
According to an embodiment of the present invention, the acid value of the carboxyl group-containing acrylate pressure-sensitive adhesive is 5 to 100mgKOH/g, for example, 5mgKOH/g, 10mgKOH/g, 20mgKOH/g, 30mgKOH/g, 40mgKOH/g, 50mgKOH/g, 60mgKOH/g, 70mgKOH/g, 75mgKOH/g, 80mgKOH/g, 90mgKOH/g, 100mgKOH/g. If the acid value is too low, the reactive active sites in the molecular chain are too few, so that the effects of increasing the molecular weight of the pressure-sensitive adhesive and reducing the residual adhesive after grafting cannot be achieved; if the acid value is too high, the storage properties of the pressure-sensitive adhesive are affected.
The acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 5-100mgKOH/g, namely, the acrylic acid ester pressure-sensitive adhesive containing carboxyl is titrated by KOH alcoholic solution, and the quality of the consumed KOH is neutralized by acid and alkali, namely, 5-100mg of KOH is consumed per gram of acrylic acid ester pressure-sensitive adhesive containing carboxyl.
Optionally, the multi-functionality acrylate compound includes at least one of dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and two or more functionality polyurethane acrylate polymers. The more than two functionality urethane acrylate polymer includes: difunctional urethane acrylate polymers, trifunctional urethane acrylate polymers, tetrafunctional urethane acrylate polymers, pentafunctional urethane acrylate polymers, hexafunctional urethane acrylate polymers, heptafunctional urethane acrylate polymers, octafunctional urethane acrylate polymers, nonafunctional urethane acrylate polymers, and the like.
The auxiliary agent comprises at least one of glycidyl acrylate and glycidyl methacrylate.
According to an embodiment of the present invention, the curing agent includes at least one of a metal ion curing agent, an aziridine-based curing agent, an isocyanate-based curing agent, an amine-based curing agent, and an epoxy-based curing agent.
According to an embodiment of the present invention, the curing accelerator includes at least one of triethylamine, benzyl dimethylamine, pyridine, dicycloamidine, N-diglycidyl aniline, benzyl triphenylphosphine bromide, triphenylphosphine, triphenylantimony, chromium acetylacetonate, tetraethylammonium bromide, 2, 4, 6-tris (dimethylaminomethyl) phenol.
According to an embodiment of the invention, the photoinitiator comprises at least one of 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-methylphenyl propane-1-one, 2-methyl-1- (4-methylthiophenyl) -2-morpholino-1-propanone, benzoin dimethyl ether, benzophenone, 2-isopropylthioxanthone, 2,4,6- (trimethylbenzoyl) -diphenylphosphine oxide, 2,4,6- (trimethylbenzoyl) -phosphonic acid ethyl ester.
The present invention also provides a UV reducing adhesive tape, referring to fig. 1, comprising a substrate layer 100, a UV reducing adhesive layer 200 and a release film layer 300, which are stacked, the UV reducing adhesive layer 200 being formed from a UV reducing composition comprising the foregoing. Thus, the UV reducing adhesive tape has all of the features and advantages of the UV reducing composition described above and will not be described in detail herein. Overall, the UV reduction adhesive tape has less residual adhesive after UV irradiation, almost no residual adhesive, and the UV reduction adhesive tape has the advantage of long storage time.
According to an embodiment of the present invention, the material forming the substrate layer 100 includes at least one of PET (polyethylene terephthalate), PO (polyolefin), PVC (polyvinyl chloride), EVA (ethylene-vinyl acetate copolymer).
The material forming the release film layer 300 includes PET.
In some embodiments of the invention, the UV curable adhesive layer 200 may have a thickness of 15-25 μm, such as 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 25 μm. Therefore, the UV anti-adhesive layer with the thickness range has high adhesive force in cutting, can effectively fix and protect materials such as glass in the cutting process, can ensure that products do not fall off and fly away, reduces breakage in cutting, and meanwhile, the UV anti-adhesive layer with the thickness range can also ensure that the thickness of the UV anti-adhesive tape is smaller and the production cost is lower.
The present invention also provides a method of preparing the UV reducing adhesive tape described hereinbefore, with reference to fig. 2, the method comprising:
s100, coating the UV anti-adhesion composition on a substrate layer, and drying after coating, so as to form a UV anti-adhesion layer on the surface of the substrate layer;
and S200, attaching a release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing to obtain the UV anti-adhesive tape.
In the UV-reducing composition, the carboxyl group-containing acrylate pressure-sensitive adhesive contains a solvent, and thus the UV-reducing composition can be coated on the substrate layer.
In some embodiments of the present invention, the UV-reducing composition may also be mixed with a solvent to form a slurry, which is then coated onto a substrate layer, and after coating is completed, dried to form a UV-reducing adhesive layer on the surface of the substrate layer. The addition of the additional solvent can improve the defects of excessive viscosity and difficult coating of the UV viscosity-reducing composition, and the slurry can be more conveniently coated on the substrate layer. The present invention is not limited in the kind of solvent added, as long as the UV-reducing composition can be dissolved in the solvent, and it is convenient to apply.
The coating method of the present invention is not limited, and for example, a doctor blade type, an extrusion type, or a cast coating type may be used for coating.
In some embodiments of the present invention, in order to increase the adhesion of the substrate layer and the slurry, the surface of one side of the substrate layer may be corona treated, and the slurry may be coated on the corona surface of the substrate layer, so that the adhesion effect of the corona surface of the substrate layer and the slurry is better.
After the coating is completed, the solvent may be removed by a drying process, and specifically, the solvent contained in the carboxyl group-containing acrylate pressure-sensitive adhesive may be removed by a drying process, or an additional solvent added for convenience of coating may be removed. After the drying is completed, a UV anti-adhesive layer is formed.
According to some embodiments of the invention, the temperature of the drying may be 70-100 ℃, e.g. 70 ℃, 75 ℃, 80 ℃, 85 ℃, 90 ℃, 95 ℃, 100 ℃, and the time of the drying may be 2-3 minutes, e.g. 2 minutes, 3 minutes.
And S200, attaching a release film layer on the surface of one side of the UV anti-adhesive layer, which is far away from the substrate layer, and curing to obtain the UV anti-adhesive tape.
According to some embodiments of the invention, the surface of the UV anti-adhesive layer on the side remote from the substrate layer may be bonded to the release surface of the release film layer.
According to some embodiments of the invention, the curing temperature is 25-60 ℃, such as 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃; the curing time is 2-7 days, such as 2 days, 3 days, 4 days, 5 days, 6 days or 7 days. For example, the mixture may be cured at a temperature of 40 to 60℃for 2 to 3 days or at a temperature of 25℃for 7 days.
Through the curing step, the active functional groups can be completely reacted, so that the adhesive film has better cohesive force. Specifically, the double bond can be grafted to the side chain of the pressure-sensitive adhesive in the curing process, so that the purposes of increasing the molecular weight and reducing the residual adhesive are achieved. In addition, the method for preparing the UV adhesive-reducing tape has the advantages of simple process and energy conservation, and the prepared UV adhesive-reducing tape has the advantage of long storage time.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not limiting in any way.
Example 1
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 20mgKOH/g; the polyfunctional acrylate compound is DPHA (dipentaerythritol hexaacrylate); the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 1-hydroxycyclohexyl phenyl ketone.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 90 ℃ for 3min to form a UV anti-adhesive layer on the surface of the substrate layer, the thickness of the UV anti-adhesive layer being 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the UV anti-adhesive layer, which is far away from the side of the substrate layer, and curing for 3 days at the temperature of 60 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Example 2
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 40mgKOH/g; the multi-functionality acrylate compound is a hexafunctionality polyurethane acrylate polymer; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 100 c for 2 minutes to form a UV anti-adhesive layer on the surface of the substrate layer, the UV anti-adhesive layer having a thickness of 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing for 3 days at the temperature of 50 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Example 3
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 100mgKOH/g; the multi-functionality acrylate compound is a 9-functionality polyurethane acrylate polymer; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 1-hydroxycyclohexyl phenyl ketone.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 90 ℃ for 3min to form a UV anti-adhesive layer on the surface of the substrate layer, the thickness of the UV anti-adhesive layer being 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing for 3 days at 60 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Example 4
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 5mgKOH/g; the multi-functionality acrylate compound is a difunctional polyurethane acrylate polymer; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 1-hydroxycyclohexyl phenyl ketone.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, and are stirred uniformly at room temperature to obtain slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 90 ℃ for 3min to form a UV anti-adhesive layer on the surface of the substrate layer, the thickness of the UV anti-adhesive layer being 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the UV anti-adhesive layer, which is far away from the side of the substrate layer, and curing for 3 days at the temperature of 60 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 1
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, a curing agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 20mgKOH/g; the polyfunctional acrylate compound is DPHA; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 1-hydroxycyclohexyl phenyl ketone. The UV-reducing composition in comparative example 1 contained no auxiliary agent.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) Mixing the UV viscosity reducing composition with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the curing agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the sizing agent.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 90 ℃ for 3min to form a UV anti-adhesive layer on the surface of the substrate layer, the thickness of the UV anti-adhesive layer being 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the UV anti-adhesive layer, which is far away from the side of the substrate layer, and curing for 3 days at the temperature of 60 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 2
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 20mgKOH/g; the polyfunctional acrylate compound is DPHA; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 1-hydroxycyclohexyl phenyl ketone.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV-visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 90 ℃ for 3min to form a UV anti-adhesive layer on the surface of the substrate layer, the thickness of the UV anti-adhesive layer being 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the UV anti-adhesive layer, which is far away from the side of the substrate layer, and curing for 3 days at the temperature of 60 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 3
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 20mgKOH/g; the polyfunctional acrylate compound is DPHA; the auxiliary agent does not contain active groups, and is N-acryloylmorpholine; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 1-hydroxycyclohexyl phenyl ketone.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV-visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 90 ℃ for 3min to form a UV anti-adhesive layer on the surface of the substrate layer, the thickness of the UV anti-adhesive layer being 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the UV anti-adhesive layer, which is far away from the side of the substrate layer, and curing for 3 days at the temperature of 60 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 4
A UV-reducing composition comprising: acrylate pressure-sensitive adhesive, polyfunctional acrylate compound, auxiliary agent, curing accelerator and photoinitiator. The content of each component is as follows:
the acrylic pressure-sensitive adhesive in comparative example 4, which did not contain carboxyl groups, had an acid value of 0mgKOH/g; the multi-functionality acrylate compound is a hexafunctionality polyurethane acrylate polymer; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV-visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the sizing agent.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 100 c for 2 minutes to form a UV anti-adhesive layer on the surface of the substrate layer, the UV anti-adhesive layer having a thickness of 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing for 3 days at the temperature of 50 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 5
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 40mgKOH/g; the multi-functionality acrylate compound is a hexafunctionality polyurethane acrylate polymer; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV-visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 100 c for 2 minutes to form a UV anti-adhesive layer on the surface of the substrate layer, the UV anti-adhesive layer having a thickness of 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing for 3 days at the temperature of 50 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 6
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 40mgKOH/g; the multi-functionality acrylate compound is a hexafunctionality polyurethane acrylate polymer; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV-visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 100 c for 2 minutes to form a UV anti-adhesive layer on the surface of the substrate layer, the UV anti-adhesive layer having a thickness of 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing for 3 days at the temperature of 50 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 7
A UV-reducing composition comprising: acrylate pressure-sensitive adhesive containing carboxyl, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 100mgKOH/g; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide. Comparative example 7 does not contain a polyfunctional acrylate compound.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV-visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, an auxiliary agent, a curing accelerator and a photoinitiator are mixed according to the proportion, a solvent is added, and the mixture is stirred uniformly at room temperature to obtain slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 100 c for 2 minutes to form a UV anti-adhesive layer on the surface of the substrate layer, the UV anti-adhesive layer having a thickness of 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing for 3 days at the temperature of 50 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 8
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 100mgKOH/g; the multi-functionality acrylate compound is a 9-functionality polyurethane acrylate polymer; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) The UV-visbreaking composition is mixed with a solvent to prepare a slurry. Specifically, the acrylic pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic compound, the auxiliary agent, the curing accelerator and the photoinitiator are mixed according to the proportion, the solvent is added, and the mixture is stirred uniformly at room temperature to obtain the slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 100 c for 2 minutes to form a UV anti-adhesive layer on the surface of the substrate layer, the UV anti-adhesive layer having a thickness of 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing for 3 days at the temperature of 50 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 9
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 5mgKOH/g; the multi-functionality acrylate compound is a difunctional polyurethane acrylate polymer; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing agent is an epoxy curing agent; the curing accelerator is DMP-30; the photoinitiator is 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) Mixing the acrylic acid ester pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic acid ester compound, the auxiliary agent, the curing accelerator and the photoinitiator according to the proportion, and stirring uniformly at room temperature to obtain slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 100 c for 2 minutes to form a UV anti-adhesive layer on the surface of the substrate layer, the UV anti-adhesive layer having a thickness of 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing for 3 days at the temperature of 50 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
Comparative example 10
A UV-reducing composition comprising: the adhesive comprises acrylate pressure-sensitive adhesive containing carboxyl, a polyfunctional acrylate compound, an auxiliary agent, a curing accelerator and a photoinitiator. The content of each component is as follows:
the acid value of the acrylic acid ester pressure-sensitive adhesive containing carboxyl is 5mgKOH/g; the multi-functionality acrylate compound is a difunctional polyurethane acrylate polymer; the auxiliary agent contains active groups and is glycidyl methacrylate; the curing accelerator is DMP-30; the photoinitiator is 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide.
The method for preparing the UV visbreaking adhesive tape comprises the following steps:
(1) And mixing the acrylic acid ester pressure-sensitive adhesive containing carboxyl, the polyfunctional acrylic acid ester compound, the auxiliary agent, the curing accelerator and the photoinitiator according to the proportion, and stirring uniformly at room temperature to obtain slurry.
(2) The slurry was coated on the corona surface of the substrate layer, and dried at 100 c for 2 minutes to form a UV anti-adhesive layer on the surface of the substrate layer, the UV anti-adhesive layer having a thickness of 20 μm.
Wherein the material of the substrate layer is PET, and the thickness of the substrate layer is 50 μm.
(3) And (3) attaching a release surface of the release film layer on the surface of the side, far away from the substrate layer, of the UV anti-adhesive layer, and curing for 3 days at the temperature of 50 ℃ to obtain the UV anti-adhesive tape.
Wherein the thickness of the release film layer is 25 mu m, and the release force of the release film layer is 5g.
To comparative illustrate the performance of the UV reduction tapes prepared in examples 1-4 and comparative examples 1-10, the prepared UV reduction tapes were subjected to performance testing.
The test method comprises the following steps: attaching a 25mm wide UV (ultraviolet) anti-adhesive tape to the glass, specifically removing a release film layer on the UV anti-adhesive tape, exposing the UV anti-adhesive layer outside, attaching the UV anti-adhesive layer to the glass, and then carrying out UV light irradiation, wherein the glass surface of the attached tape faces upwards during irradiation, and the intensity of the UV light irradiation is 400mJ/cm 2 And then removing the UV reducing adhesive tape adhered to the glass, and detecting the residual adhesive condition of the surface of the glass.
The test results are shown in Table 1 below.
TABLE 1
As can be seen from Table 1, the residual gums are present in each of comparative examples 1-10, none of examples 1-4, and the post UV peel force is small, further illustrating that when the UV-curable composition comprises: 50-100 parts by weight of acrylic pressure-sensitive adhesive containing carboxyl, 2-50 parts by weight of polyfunctional acrylic compound, 1-20 parts by weight of auxiliary agent, 0.001-0.5 part by weight of curing accelerator and 0.1-3 parts by weight of photoinitiator, so that the problem of residual glue can be effectively avoided.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present specification, the descriptions of the terms "one embodiment," "another embodiment," "some embodiments," "example," "specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (7)

1. A method of making a UV-tack-reducing adhesive tape, the method comprising:
coating the UV anti-adhesion composition on a substrate layer, and drying after coating, so as to form a UV anti-adhesion layer on the surface of the substrate layer;
attaching a release film layer on the surface of one side of the UV anti-adhesive layer, which is far away from the substrate layer, and curing to obtain a UV anti-adhesive tape;
wherein the curing temperature is 25-60 ℃, and the curing time is 2-7 days;
the UV-reducing composition comprises: 50-100 parts by weight of acrylic pressure-sensitive adhesive containing carboxyl, 2-50 parts by weight of polyfunctional acrylic compound, 1-20 parts by weight of auxiliary agent, 0.001-0.5 part by weight of curing accelerator and 0.1-3 parts by weight of photoinitiator;
wherein the auxiliary agent comprises at least one of glycidyl acrylate and glycidyl methacrylate;
In the multi-functionality acrylate compound, the functional group corresponding to the functionality is a carbon-carbon double bond, and the functionality is more than or equal to 2;
the curing agent comprises an epoxy curing agent.
2. The method according to claim 1, wherein the carboxyl group-containing acrylate pressure-sensitive adhesive has an acid value of 5 to 100mgKOH/g.
3. The method of claim 1, wherein the multi-functionality acrylate compound comprises at least one of dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and two or more functionality urethane acrylate polymers.
4. The method of claim 1, wherein the cure accelerator comprises at least one of triethylamine, benzyl dimethylamine, pyridine, dicycloamidine, N-diglycidyl aniline, benzyl triphenylphosphine bromide, triphenylphosphine, triphenylantimony, chromium acetylacetonate, tetraethylammonium bromide, 2,4, 6-tris (dimethylaminomethyl) phenol.
5. The method of claim 1, wherein the photoinitiator comprises at least one of 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-methylphenyl propane-1-one, 2-methyl-1- (4-methylthiophenyl) -2-morpholino-1-propanone, benzoin dimethyl ether, benzophenone, 2-isopropylthioxanthone, 2,4,6- (trimethylbenzoyl) -diphenyl phosphine oxide, 2,4,6- (trimethylbenzoyl) -phosphonic acid ethyl ester.
6. The method of claim 1, wherein the UV reducing adhesive tape comprises a substrate layer, a UV reducing adhesive layer, and a release film layer in a stacked arrangement;
the material forming the substrate layer includes at least one of PET, PO, PVC, EVA;
the material forming the release film layer comprises PET.
7. The method of claim 1, wherein the temperature of the drying is 70-100 ℃ and the time of the drying is 2-3 minutes.
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