CN112029437B - Acrylic pressure-sensitive adhesive tape and preparation method and application thereof - Google Patents

Acrylic pressure-sensitive adhesive tape and preparation method and application thereof Download PDF

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Publication number
CN112029437B
CN112029437B CN202010938982.4A CN202010938982A CN112029437B CN 112029437 B CN112029437 B CN 112029437B CN 202010938982 A CN202010938982 A CN 202010938982A CN 112029437 B CN112029437 B CN 112029437B
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sensitive adhesive
monomer
acrylic pressure
resin
adhesive tape
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CN112029437A (en
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许俊
赵晶泽
刘成峰
吴磊隽
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Anhui Haibo New Material Co ltd
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Anhui Haibo New Material Co ltd
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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
    • 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
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
    • 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
    • C09J11/08—Macromolecular additives
    • 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
    • C09J135/00—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 a carboxyl radical, and containing at least another carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J135/02—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
    • C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/241—Polyolefin, e.g.rubber
    • C09J7/243—Ethylene or propylene polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • 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
    • C09J2203/322—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of solar panels
    • 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
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C09J2423/046—Presence of homo or copolymers of ethene in the substrate

Abstract

The invention relates to the technical field of bonding articles, in particular to an acrylic pressure-sensitive adhesive and a preparation method and application thereof. An acrylic pressure-sensitive adhesive tape, which comprises a substrate and an acrylic pressure-sensitive adhesive coated on one side of the substrate; the other surface of the substrate is coated with a release coating; the preparation raw materials of the acrylic pressure-sensitive adhesive at least comprise the following components in percentage by weight: 75-90% of polyacrylic resin, 5-20% of tackifying resin and 1-10% of curing agent. According to the pressure-sensitive adhesive, the polyacrylic resin with a specific molecular weight, the specific tackifying resin and the curing agent are matched, so that the prepared pressure-sensitive adhesive tape is large in cohesive force, good in wettability, excellent in water resistance and aging resistance and good in invisible effect; compared with the traditional acrylic pressure-sensitive adhesive, the acrylic pressure-sensitive adhesive has more excellent adhesion, yellowing resistance, ultraviolet resistance and peel strength, effectively solves the problems of degumming and adhesive residue of the traditional acrylic pressure-sensitive adhesive, and is particularly suitable for the field of fixing photovoltaic cell panels.

Description

Acrylic pressure-sensitive adhesive tape and preparation method and application thereof
Technical Field
The invention relates to the technical field of bonding articles, in particular to an acrylic pressure-sensitive adhesive and a preparation method and application thereof.
Background
The pressure-sensitive adhesive is an adhesive which can be firmly adhered with an adherend by applying slight pressure without the aid of solvent or heat, and has wide application range, and the application range is as small as that of a civil adhesive tape to military aviation and aerospace. The pressure-sensitive adhesive can be divided into five types, namely rubber type, organic silicon type, thermoplastic type, polyurethane type and acrylate pressure-sensitive adhesive. The acrylate pressure-sensitive adhesive is a copolymer synthesized by vinyl and other acrylate monomers, can be divided into emulsion type, radiation curing type, hot melt type, acrylic acid type and the like, and has more excellent comprehensive performance compared with other types of pressure-sensitive adhesives.
Although the adhesive tape disclosed at present can meet the basic requirements of solution corrosion resistance, insulativity and the like, the problem of balance of initial viscosity, lasting viscosity and peeling strength is not well solved, most of pressure-sensitive adhesive tapes are easy to degum and residual adhesive in the using process, the temperature resistance and the water resistance are poor, the transparency and the transparency rate are lower, and the application range of the pressure-sensitive adhesive tapes is severely limited.
Aiming at the technical problems, the invention provides the acrylic pressure-sensitive adhesive tape which has the advantages of good wettability and transparency, excellent temperature resistance and water resistance, excellent initial adhesion, lasting adhesion, peeling strength and other comprehensive properties, and is particularly suitable for the field of fixing of photovoltaic cell panels.
Disclosure of Invention
In order to solve the above technical problems, a first aspect of the present invention provides an acrylic pressure sensitive adhesive tape comprising a substrate and an acrylic pressure sensitive adhesive coated on one side of the substrate; the other surface of the substrate is coated with a release coating; the preparation raw materials of the acrylic pressure-sensitive adhesive at least comprise the following components in percentage by weight: 75-90% of polyacrylic resin, 5-20% of tackifying resin and 1-10% of curing agent.
As a preferred technical scheme of the invention, the thickness of the base material is 0.01-0.5 mm; the thickness of the pressure-sensitive adhesive is 10-50 μm.
As a preferable technical scheme of the invention, the preparation raw material of the polyacrylic resin at least comprises the following components in parts by weight: 80-120 parts of monomer I, 10-30 parts of monomer II, 1-10 parts of monomer III, 0.1-5 parts of initiator and 500 parts of solvent 200-one.
In a preferred embodiment of the present invention, the monomer i is at least one selected from the group consisting of methyl acrylate, ethyl acrylate, n-butyl acrylate, n-pentyl acrylate, n-hexyl acrylate, n-heptyl acrylate, n-octyl acrylate, isooctyl acrylate, n-nonyl acrylate, lauryl acrylate, vinyl acetate, vinyl carbonate, styrene, isobornyl acrylate, acrylonitrile, and homologs thereof.
In a preferred embodiment of the present invention, the monomer ii is at least one selected from the group consisting of a hydroxyl group-containing monomer, a carboxyl group-containing monomer, an epoxy group-containing monomer, a primary and secondary tertiary amine group-containing monomer, a cyano group-containing monomer, an amide group-containing monomer, and a chlorofluoro element-containing monomer.
In a preferred embodiment of the present invention, the monomer ii is at least one selected from the group consisting of acrylic acid, dicyclopentadiene maleate, maleic anhydride, itaconic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, dimethylaminoethyl methacrylate, N-vinylpyrolidone, glycidyl acrylate, N-dimethylaminoethyl methacrylate, α -cyanoacrylate, acryloylmorpholine, trifluoroethyl acrylate, tridecafluorooctyl acrylate, dodecafluoroheptyl methacrylate, and homologs thereof.
As a preferred technical scheme of the invention, the boiling point of the solvent is 70-100 ℃.
As a preferable technical scheme, the preparation method of the polyacrylic resin comprises the following steps:
(1) adding the monomer I, the monomer II and the monomer III into a reaction kettle, uniformly stirring, adding a solvent, and heating to 45-65 ℃ in an inert gas environment while stirring;
(2) adding an initiator, stirring and heating to 70-85 ℃, and stopping the reaction until the solid content of the mixed material is 30-70% and the viscosity is 1000-50000 cps;
(3) cooling to below 40 deg.C, and discharging.
The second aspect of the present invention provides a method for preparing the acrylic pressure sensitive adhesive tape, comprising at least the steps of:
(1) preparation of acrylic pressure-sensitive adhesive: uniformly mixing polyacrylic resin and tackifying resin, adding a curing agent, and uniformly stirring to obtain the acrylic resin-tackifying resin emulsion;
(2) preparation of the substrate: directly coating a solution containing a release agent on the surface of a base material, and drying to obtain the release agent;
(3) preparation of acrylic pressure sensitive adhesive tape: and directly coating the pressure-sensitive adhesive on the other surface of the base material, drying and rolling to obtain the pressure-sensitive adhesive.
The third aspect of the invention provides an application of the acrylic pressure-sensitive adhesive tape, and the acrylic pressure-sensitive adhesive tape is applied to the field of fixing of photovoltaic cell panels.
Advantageous effects
The invention provides an acrylic pressure-sensitive adhesive tape, wherein the pressure-sensitive adhesive is prepared by matching polyacrylic resin with a specific molecular weight, specific tackifying resin and a curing agent, so that the prepared acrylic pressure-sensitive adhesive has high cohesive force, good wettability and excellent water resistance and aging resistance; compared with the traditional acrylic pressure-sensitive adhesive, the acrylic pressure-sensitive adhesive has more excellent adhesion, yellowing resistance, ultraviolet resistance and peel strength, effectively solves the problems of degumming and adhesive residue of the traditional acrylic pressure-sensitive adhesive, and has good light transmittance and good invisible effect; the acrylate pressure-sensitive adhesive can still maintain excellent bonding performance under the conditions of high temperature or low temperature; the adhesive tape made of the acrylate pressure-sensitive adhesive can be formed in one step, a PC film is specially selected as a base material, the adhesive tape is better in transparency, thinner in thickness, low in manufacturing cost, convenient to use and wide in application range, and is particularly suitable for the field of fixing of photovoltaic cell panels.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
In order to solve the above technical problems, a first aspect of the present invention provides an acrylic pressure sensitive adhesive tape comprising a substrate and an acrylic pressure sensitive adhesive coated on one side of the substrate; the other surface of the substrate is coated with a release coating.
Base material
In the invention, the thickness of the base material is 0.01-0.5 mm.
In a preferred embodiment, the substrate has a thickness of 0.065-0.1 mm.
In the present invention, the substrate is not particularly limited, and paper, cloth, film and the like can be mentioned.
In a preferred embodiment, the substrate is a film.
In a more preferred embodiment, the material of the film is selected from one of Polyethylene (PE), polypropylene (PP), Polyester (PET) and polyimide.
In order to reduce the thickness of the pressure-sensitive adhesive tape and improve the transparency and light transmittance of the pressure-sensitive adhesive tape, the substrate is a PE film.
In the present invention, the source of the PE film is not particularly limited, and Tokyo plastics Co., Ltd, Zhongshan may be mentioned.
In the invention, the other surface of the substrate is coated with a release coating.
In a preferred embodiment, the thickness of the release coating is 0.01 to 0.5 μm.
In a preferred embodiment, the material of the release coating is a release agent.
In a preferred embodiment, the release agent may be one of silicone release agent and non-silicone release agent.
In order to prevent the substrate from being subjected to corona treatment, improve the adhesive force between the release agent and the substrate, form a smooth and compact film on the surface of the film, isolate the film from the pressure-sensitive adhesive, prevent the film from being separated and damaged easily and avoid reaction and adhesion with the pressure-sensitive adhesive, the release agent is an organic silicon release agent.
In the present invention, the source of the silicone release agent is not particularly limited, and new four-sea chemical corporation, Hubei, may be mentioned.
Pressure-sensitive adhesive
In the invention, the preparation raw materials of the acrylic pressure-sensitive adhesive at least comprise the following components in percentage by weight: 75-90% of polyacrylic resin, 5-20% of tackifying resin and 1-10% of curing agent.
In a preferred embodiment, the preparation raw material of the acrylic pressure-sensitive adhesive at least comprises the following components in percentage by weight: 80% of polyacrylic resin, 16% of tackifying resin and 4% of curing agent.
Polyacrylic acid resin
In the invention, the preparation raw materials of the polyacrylic resin at least comprise the following components in parts by weight: 80-120 parts of monomer I, 10-30 parts of monomer II, 1-10 parts of monomer III, 0.1-5 parts of initiator and 500 parts of solvent 200-one.
In a preferred embodiment, the weight ratio of monomer i, monomer ii and monomer iii is 1: (0.05-0.5): (0.001-0.01).
In a preferred embodiment, the raw materials for preparing the polyacrylic resin at least comprise the following components in parts by weight: 100 parts of monomer I, 20 parts of monomer II, 5 parts of monomer III, 4 parts of initiator and 400 parts of solvent.
< monomer I >
In the present invention, the monomer I is at least one selected from the group consisting of methyl acrylate, ethyl acrylate, n-butyl acrylate, n-pentyl acrylate, n-hexyl acrylate, n-heptyl acrylate, n-octyl acrylate, isooctyl acrylate, n-nonyl acrylate, lauryl acrylate, vinyl acetate, vinyl carbonate, styrene, isobornyl acrylate, acrylonitrile, and homologs thereof.
In a preferred embodiment, the monomer i is a mixture of ethyl methacrylate, isobornyl methacrylate and isooctyl acrylate.
In a preferred embodiment, the weight ratio of ethyl methacrylate, isobornyl methacrylate and isooctyl acrylate is 1: (0.3-0.8): (1-5).
In a more preferred embodiment, the weight ratio of ethyl methacrylate, isobornyl methacrylate and isooctyl acrylate is 1: 0.4: 1.5.
the inventor finds that the compounding of ethyl methacrylate, isobornyl methacrylate and isooctyl acrylate has a synergistic effect, and the cohesive strength of the pressure-sensitive adhesive can be improved, so that the holding viscosity, 180-degree peel strength and temperature resistance of the pressure-sensitive adhesive are improved. The inventors considered that the reason is probably that the 180 ° peel strength is increased because the glass transition temperature of the copolymer is increased by the ethyl methacrylate monomer, the rigidity of the molecular segment is increased, the cohesive strength is increased. However, the cohesive strength of the polymer system is large, its wettability with an adherend is reduced, and the initial tack is low, resulting in a reduction in peel strength. And a certain amount of isooctyl acrylate is compounded, so that the rigidity of a molecular chain segment can be reduced, and the initial viscosity of the polymer can be improved, but the side chain is longer, and the side chain is easy to be tangled together along with the increase of the content of the side chain, so that the movement of the molecular chain segment is hindered, and the initial viscosity is not obviously improved. The inventor unexpectedly finds that the compounding of a certain amount of isobornyl methacrylate not only can improve the side chain entanglement problem of isooctyl acrylate molecules, but also can obviously improve the temperature resistance of the pressure-sensitive adhesive. The reason may be that isobornyl methacrylate molecules have a bulky six-membered ring structure inside, which can play a role in blocking, not only can hinder entanglement of isooctyl acrylate side chains, but also can improve the temperature resistance of the pressure sensitive adhesive. However, when the amount of isobornyl methacrylate is too large, rotation and movement of the macromolecular segment become difficult, resulting in a decrease in overall properties; if the amount of isobornyl methacrylate is too small, the above effects cannot be obtained, and therefore, in the present system, the weight ratio of ethyl methacrylate, isobornyl methacrylate and isooctyl acrylate is preferably 1: (0.3-0.8): (1-5).
In addition, the inventor also unexpectedly finds that the ethyl methacrylate and the isooctyl acrylate have certain length difference, after the ethyl methacrylate and the isooctyl acrylate are polymerized with the isobornyl methacrylate, proper cross-linking is generated among molecules, the ethyl methacrylate and the isooctyl acrylate have a three-dimensional network structure with better compactness, the internal structure is stable, the cohesive force and the creep resistance are improved, the occurrence of degumming is avoided, and the ethyl methacrylate and the isooctyl acrylate can be damaged only at higher temperature, so that the high-temperature resistance is further improved.
< monomer II >
In the invention, the monomer II is at least one selected from a monomer containing hydroxyl, a monomer containing carboxyl, a monomer containing epoxy, a monomer containing primary and secondary tertiary amino, a monomer containing cyano, a monomer containing amido and a monomer containing chlorine and fluorine elements.
In a preferred embodiment, the monomer II is selected from at least one of acrylic acid, dicyclopentadiene maleate, maleic anhydride, itaconic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, dimethylaminoethyl methacrylate, N-vinylpyrrolidinone, glycidyl acrylate, N-dimethylaminoethyl methacrylate, alpha-cyanoacrylate, acryloylmorpholine, trifluoroethyl acrylate, tridecafluorooctyl acrylate, dodecafluoroheptyl methacrylate and homologues thereof.
In a more preferred embodiment, the monomer II is a mixture of acrylic acid, glycidyl methacrylate, tridecafluorooctyl methacrylate, dicyclopentadiene maleate.
In a more preferred embodiment, the weight ratio of acrylic acid, glycidyl methacrylate, tridecafluorooctyl methacrylate, dicyclopentadiene maleate is 1: (0.5-1.5): (0.1-1): (0.1-1).
In a most preferred embodiment, the weight ratio of acrylic acid, glycidyl methacrylate, tridecafluorooctyl methacrylate, dicyclopentadiene maleate is 1: 1: 0.2: 0.3.
the polypropylene is a polar monomer, the polymerization activity of the polypropylene is higher, however, because carboxyl in acrylic acid does not completely form a network structure, a product taking a side group or a terminal group as-COOH is synthesized, the pressure-sensitive adhesive is easy to react with-OH, partial molecules are rapidly lost, and finally, the water resistance of the prepared polypropylene resin is poor. And a certain amount of glycidyl methacrylate, tridecafluorooctyl methacrylate and dicyclopentadiene maleate are compounded, so that the water resistance of the pressure-sensitive adhesive can be improved, and the initial adhesion and 180-degree peel strength are also obviously improved. The inventors thought that the possible reason is that the esterification reaction of the carboxyl group of the acrylic monomer forms a certain network structure, so that the cohesive strength of the polyacrylate is higher, the cohesive force is higher, the wetting property of the surface of the adhesive tape is further reduced, and the initial adhesion force and 180-degree peel strength of the adhesive tape are reduced. After a certain amount of glycidyl methacrylate and tridecafluorooctyl methacrylate are compounded, on one hand, the glass transition temperature of the polymer can be reduced, and the wettability and initial viscosity of the polymer can be improved, and on the other hand, the prepared polyacrylate resin has a stronger effect of resisting external invasion because the steric effect of the glycidyl methacrylate is stronger than that of acrylic acid; meanwhile, the molecular structures of tridecafluorooctyl methacrylate and dicyclopentadiene maleate have stronger steric hindrance and shielding effects, and when the usage amount of the tridecafluorooctyl methacrylate and dicyclopentadiene maleate is within a reasonable range, fluorine forms a special structure which is orderly arranged on the surface of the pressure-sensitive adhesive, the structure endows the pressure-sensitive adhesive with strong hydrophobic property, so that the contact angle is greatly changed, and the hydrophobicity of the surface of the pressure-sensitive adhesive is improved. The inventor also unexpectedly finds that the isobornyl methacrylate monomer and the dicyclopentadiene maleate monomer are compounded to generate synergistic interaction, so that the adhesive property and the peel strength of the pressure-sensitive adhesive under low-temperature conditions can be obviously improved.
< monomer III >
In the invention, the monomer III is at least one selected from pentaerythritol triacrylate, trimethylolpropane triacrylate, 1, 6-hexanediol dimethacrylate, 1, 6-hexanediol diacrylate, ethylene glycol diacrylate, triethylene glycol diacrylate, tripropylene glycol diacrylate, p-neopentyl glycol diacrylate, trimethylolpropane trimethacrylate, trimethylolpropane pentaerythritol triacrylate, propoxylated neopentyl glycol diacrylate and ethoxylated 1, 6-hexanediol diacrylate.
In a preferred embodiment, the monomer III is a mixture of trimethylolpropane triacrylate and p-neopentyl glycol diacrylate.
In a more preferred embodiment, the weight ratio of trimethylolpropane triacrylate to diacrylate to neopentyl glycol ester is 1: (0.5-2).
In a more preferred embodiment, the weight ratio of trimethylolpropane triacrylate to diacrylate to neopentyl glycol ester is 1: 0.8.
the inventor finds that the bonding endurance of the pressure-sensitive adhesive can be obviously improved and the problems of degumming and adhesive residue can be improved by compounding a certain amount of trimethylolpropane pentaerythritol triacrylate and propoxylated neopentyl glycol diacrylate. The inventor believes that the possible reasons are that trimethylolpropane triacrylate and diacrylic acid have higher reactivity to neopentyl glycol ester, so that the acting force between molecular chains is increased, the cohesive force of the polymer is enhanced, and the problems of pressure-sensitive adhesive degumming and adhesive residue can be obviously improved. However, as the amount of the polymer is further increased, the degree of crosslinking of the polymer is increased, the rigidity is enhanced, the glass transition temperature is increased to an excessive extent, and the initial adhesion is remarkably reduced. Thus, in the present system, the weight ratio of the monomer I, the monomer II and the monomer III is 1: (0.05-0.5): (0.001-0.01).
< initiator >
In the present invention, the initiator is not particularly limited, and a peroxide initiator, an azo-type initiator, a redox initiator, and the like can be mentioned.
In a preferred embodiment, the initiator is a peroxide initiator.
In a more preferred embodiment, the peroxide initiator is selected from at least one of the group consisting of acyl peroxides, hydroperoxides, dialkyl peroxides, ester peroxides, ketone peroxides, dicarbonate peroxides, persulfates.
In a more preferred embodiment, the initiator is selected from at least one of benzoyl peroxide, lauroyl peroxide, cumene hydroperoxide, t-butyl hydroperoxide, di-t-butyl peroxide, dicumyl peroxide, t-butyl peroxybenzoate, t-butyl peroxypivalate, methyl ethyl ketone peroxide, cyclohexanone peroxide, diisopropyl peroxydicarbonate, and dicyclohexyl peroxydicarbonate.
In a most preferred embodiment, the initiator is benzoyl peroxide.
The inventor unexpectedly finds that when the selected initiator is benzoyl peroxide, the prepared polyacrylic resin has larger molecular weight, better crosslinking degree and better transparency of glue solution. The inventors considered that the possible reason is that the polymerization temperature when benzoyl peroxide is used as an initiator is 82 ℃ which is higher than the boiling point (78 ℃) of ethyl acetate as a solvent, so that a large amount of ethyl acetate vapor exists on the liquid surface of the polymerization system, and the ethyl acetate vapor can isolate oxygen in the outside of the polymerization system from the system, so that the inhibition of oxygen is avoided, and the life of radicals in the polymerization system is prolonged; on the other hand, the reaction between the components in the system and oxygen is inhibited, so that the color of the glue solution is darkened. The inventor also unexpectedly finds that the primary free radical formed by benzoyl peroxide is an acyloxy radical, when tertiary hydrogen exists in a molecular chain (tertiary hydrogen exists in isooctyl acrylate monomer), a certain degree of grafting reaction occurs in the molecular chain, so that the number of branch chains of the macromolecular chain is relatively increased, the probability of improving cohesive strength through physical crosslinking between the molecular chains is higher, and the pressure-sensitive adhesive prepared by using benzoyl peroxide as an initiator has higher cohesive strength and higher cohesive force. Meanwhile, because the isooctyl acrylate contains a tertiary hydrogen structure, primary free radicals formed by benzoyl peroxide can generate a grafting reaction at the tertiary hydrogen position of a molecular chain, the side chains of polymers become more, and the high and low temperature resistance of the pressure-sensitive adhesive can not be improved by memory.
< solvent >
In the invention, the boiling point of the solvent is 70-100 ℃.
In a preferred embodiment, the solvent may be esters, alcohols, aromatic hydrocarbons, and the like.
In a more preferred embodiment, the solvent is a mixture of ethyl acetate, isopropanol, and toluene.
In a more preferred embodiment, the volume ratio of ethyl acetate, isopropanol and toluene is 1: (0.05-0.5): (0.1-1).
In a most preferred embodiment, the volume ratio of ethyl acetate, isopropanol and toluene is 1: 0.09: 0.5.
although the solvent does not participate in the polymerization reaction, the solvent has an induction effect in the process of free radical decomposition, so that the prepared polyacrylate resin has different molecular weights, and the bonding performance of the final pressure-sensitive adhesive is influenced. The inventors found in the course of their research that when the solvent used is a combination of ethyl acetate, toluene and isopropanol, the polyacrylate resin prepared has a sufficient degree of crosslinking, and the crosslinking is not excessive, thereby improving the tensile strength and stretch ratio of the pressure-sensitive adhesive. The inventor believes that the possible reason is that the ethyl acetate has a small chain transfer constant, so that the prepared polyacrylate resin has a high molecular weight, and in order to prevent the polyacrylic resin from being excessively crosslinked, the molecular weight of the polyacrylic resin can be adjusted and controlled by compounding certain isopropanol and toluene, and particularly when the volume ratio of the ethyl acetate to the isopropanol to the toluene is 1: (0.05-0.5): (0.1-1), the molecular weight of the polyacrylate resin obtained is most preferably 80-120 ten thousand. In addition, the boiling points of the ethyl acetate and the isopropanol are both about 80 ℃ and basically do not exceed the boiling point of the reaction monomer, so that the number of free radicals in the reaction process is increased, and the formation of molecular chains is facilitated.
In the invention, the preparation method of the polyacrylic resin comprises the following steps:
(1) adding the monomer I, the monomer II and the monomer III into a reaction kettle, uniformly stirring, adding a solvent, and heating to 45-65 ℃ in an inert gas environment while stirring;
(2) adding an initiator, stirring and heating to 70-85 ℃, and stopping the reaction until the solid content of the mixed material is 30-70% and the viscosity is 1000-50000 cps;
(3) cooling to below 40 deg.C, and discharging.
The inventors believe that the optimum reaction temperature is preferably not less than 80 c, preferably 85 c, and the transparency of the resulting dope is optimum.
The viscosity test method is to use a rotational viscometer of model NDJ-8S produced by Shanghai plain Xuan scientific instruments Co., Ltd to test according to the GB/T2794-1995 standard.
The method for testing the solid content of the glue comprises the following steps:
the first step is as follows: cutting the aluminum foil into a rectangle of 8cm multiplied by 10cm, folding the rectangle into a box-packed aluminum foil by contrasting with a square mould of 4cm multiplied by 6cm, and weighing by a ten thousand-level electronic balance (a secondary balance is used in the following steps) of an Aohause (China) company with the model number AR2140 for three times to record the average value m;
the second step is that: adding 0.2 g-0.3 g of glue solution into the folded box, weighing and recording m1(title toOne time of weighing can be caused by the volatilization of the solvent, and when the weighing is carried out for three times, the weighing at the next time is found to be one order of magnitude less than the weighing at the last time);
the third step: m to be weighed1Taking out and immediately placing in a blast constant temperature oven under the conditions of 100 ℃ for 2h and 120 ℃ for 1h, taking out and cooling to room temperature, weighing for three times, and recording the average value m2；
The fourth step: according to formula G ═ m2-m)/(m1-m)]X 100% solids content was calculated.
Tackifying resins
In the present invention, the tackifier resin is not particularly limited, and petroleum resin, limonene resin, alkylphenol resin, xylene resin, rosin resin, and the like can be mentioned.
In a preferred embodiment, the tackifying resin is an limonene resin.
In a preferred embodiment, the glass transition temperature of the alkenyl terpene resin is from 70 to 100 ℃.
In the present invention, the source of the terpene resin is not particularly limited, and Shanghai Denfang trade company, Inc. may be mentioned.
The inventor finds that in the system, the cohesive strength of the molecular chain is high, and fluorine groups with strong hydrophobicity exist, so that the wettability of the surface of the adhesive tape is influenced, and the initial viscosity is reduced. The inventor unexpectedly finds that the problem can be better solved by compounding a certain amount of tackifying resin, because the addition of the tackifying resin can cause the change of the internal structure and the surface condition of the adhesive layer, in the system, the tackifying resin is taken as a disperse phase and can be enriched on the surface of the adhesive layer to form the surface of the adhesive layer with low surface energy, and the surface has lower surface energy and can improve the wetting capacity of low-surface-energy substances, thereby improving the initial viscosity of the pressure-sensitive adhesive, and particularly, the tackifying effect is obvious by selecting the alkene terpene resin with the glass transition temperature of 70-100 ℃. However, the alkene terpene resin cannot be dissolved in ester and alcohol solvents, so that the compatibility of the alkene terpene resin and polyacrylic resin is poor, the incompatible tackifying resin reduces the system modulus, the peel strength and the permanent adhesive force are reduced, and the solvent is compounded with a certain amount of toluene, so that the crosslinking degree and the molecular weight of the polyacrylic resin can be improved, the compatibility of the alkene terpene resin and the system can be improved, and the wettability and the initial viscosity of the pressure sensitive adhesive are improved. However, as the amount of tackifying resin is increased, the integrity of the continuous phase begins to be destroyed, the modulus of the system increases, and excessive amounts of tackifying resin can lead to reduced entanglement behavior of the linear polymer with the crosslinked network, reduced crosslink density, and thus reduced cohesion and reduced permanent adhesion. Therefore, the amount of the tackifier resin added in the system cannot exceed 20%.
Curing agent
In the present invention, the curing agent is not particularly limited.
In a preferred embodiment, the curing agent is a C4-C6 alkylol etherified melamine resin.
In a more preferred embodiment, the curing agent is n-butanol etherified melamine formaldehyde resin.
In the present invention, the source of the n-butanol etherified melamine formaldehyde resin is not particularly limited, and is purchased from Shanghai Xinhua resin Co., Ltd.
The second aspect of the present invention provides a method for preparing the acrylic pressure sensitive adhesive tape, comprising at least the steps of:
(1) preparation of acrylic pressure-sensitive adhesive: uniformly mixing polyacrylic resin and tackifying resin, adding a curing agent, and uniformly stirring to obtain the acrylic resin-tackifying resin emulsion;
(2) preparation of the substrate: directly coating a solution containing a release agent on the surface of a base material, and drying to obtain the release agent;
(3) preparation of acrylic pressure sensitive adhesive tape: and directly coating the pressure-sensitive adhesive on the other surface of the base material, drying and rolling to obtain the pressure-sensitive adhesive.
In a preferred embodiment, the solution containing the release agent is prepared by dissolving the release agent and the like in a solvent, and the solvent can be at least one selected from toluene, ethyl acetate, acetone, butanone and isopropanol; the concentration of the release agent in the solution containing the release agent is not particularly limited.
The third aspect of the invention provides an application of the acrylic pressure-sensitive adhesive tape, and the acrylic pressure-sensitive adhesive tape is applied to the field of fixing of photovoltaic cell panels.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
In addition, the starting materials used are all commercially available, unless otherwise specified.
Examples
Example 1
Example 1 provides an acrylic pressure sensitive adhesive tape comprising a substrate and an acrylic pressure sensitive adhesive coated on one side of the substrate; the other surface of the substrate is coated with a release coating; the base material is a PE film with the thickness of 0.07mm and is purchased from Dongqiao plastic Co., Ltd, Zhongshan City; the thickness of the release coating is 0.2 mu m, the material is an organic silicon release agent, and the release coating is purchased from chemical industry Co., Ltd, New four seas, Hubei; the curing agent is n-butyl alcohol etherified melamine formaldehyde resin which is purchased from Shanghai Xinhua resin Co., Ltd;
the preparation raw materials of the acrylic pressure-sensitive adhesive at least comprise the following components in parts by weight: 80% of polyacrylic resin, 16% of tackifying resin and 4% of curing agent; the tackifying resin is an alkene terpene resin, the glass transition temperature is 80 +/-5 ℃, and the tackifying resin is purchased from Shanghai Denseur trade company;
the polyacrylic resin is prepared from the following raw materials in parts by weight: 100 parts of monomer I, 20 parts of monomer II, 5 parts of monomer III, 4 parts of initiator and 400 parts of solvent; the monomer I is a mixture of ethyl methacrylate, isobornyl methacrylate and isooctyl acrylate, and the weight ratio is 1: 0.4: 1.5; the monomer II is a mixture of acrylic acid, glycidyl methacrylate, tridecafluorooctyl methacrylate and dicyclopentadiene maleate, and the weight ratio is 1: 1: 0.2: 0.3; the monomer III is a mixture of trimethylolpropane triacrylate and p-neopentyl glycol diacrylate, and the weight ratio is 1: 0.8; the initiator is benzoyl peroxide; the solvent is a mixture of ethyl acetate, isopropanol and toluene, and the volume ratio is 1: 0.09: 0.5;
the preparation method of the polyacrylic resin comprises the following steps:
(1) adding the monomer I, the monomer II and the monomer III into a reaction kettle, uniformly stirring, adding a solvent, and heating to 60 ℃ in an inert gas environment while stirring;
(2) adding an initiator, stirring and heating to 85 ℃, and stopping the reaction until the solid content of the mixed material is 45 +/-5% and the viscosity is 30000 +/-10000 cps;
(3) cooling to below 40 deg.C, and discharging.
The preparation method of the acrylic pressure-sensitive adhesive tape at least comprises the following steps:
(1) preparation of acrylic pressure-sensitive adhesive: uniformly mixing polyacrylic resin and tackifying resin, adding a curing agent, and uniformly stirring to obtain the acrylic resin-tackifying resin emulsion;
(2) preparation of the substrate: directly coating a 30 wt% release agent toluene solution on the surface of a substrate, and drying to obtain the release agent;
(3) preparation of acrylic pressure sensitive adhesive tape: and directly coating the pressure-sensitive adhesive on the other surface of the base material, drying and rolling to obtain the pressure-sensitive adhesive.
Example 2
Embodiment 2 provides an acrylic pressure sensitive adhesive tape comprising a substrate and an acrylic pressure sensitive adhesive coated on one side of the substrate; the other surface of the substrate is coated with a release coating; the base material is a PE film with the thickness of 0.065mm and is purchased from Dongqiao plastic Co., Ltd, Zhongshan City; the thickness of the release coating is 0.01 mu m, the material is organic silicon release agent, and the release coating is purchased from chemical industry Co., Ltd, New four seas, Hubei; the curing agent is n-butyl alcohol etherified melamine formaldehyde resin which is purchased from Shanghai Xinhua resin Co., Ltd;
the preparation raw materials of the acrylic pressure-sensitive adhesive at least comprise the following components in parts by weight: 75% of polyacrylic resin, 20% of tackifying resin and 5% of curing agent; the tackifying resin is an alkene terpene resin, the glass transition temperature is 80 +/-5 ℃, and the tackifying resin is purchased from Shanghai Denseur trade company;
the polyacrylic resin is prepared from the following raw materials in parts by weight: 80 parts of monomer I, 10 parts of monomer II, 1 part of monomer III, 0.1 part of initiator and 200 parts of solvent; the monomer I is a mixture of ethyl methacrylate, isobornyl methacrylate and isooctyl acrylate, and the weight ratio is 1: 0.3: 1; the monomer II is a mixture of acrylic acid, glycidyl methacrylate, tridecafluorooctyl methacrylate and dicyclopentadiene maleate, and the weight ratio is 1: 0.5: 0.1: 0.1; the monomer III is a mixture of trimethylolpropane triacrylate and p-neopentyl glycol diacrylate, and the weight ratio is 1: 0.5; the initiator is benzoyl peroxide; the solvent is a mixture of ethyl acetate, isopropanol and toluene, and the volume ratio is 1: 0.05: 0.1;
the preparation method of the polyacrylic resin comprises the following steps:
(1) adding the monomer I, the monomer II and the monomer III into a reaction kettle, uniformly stirring, adding a solvent, and heating to 60 ℃ in an inert gas environment while stirring;
(2) adding an initiator, stirring and heating to 85 ℃, and stopping the reaction until the solid content of the mixed material is 45 +/-5% and the viscosity is 30000 +/-10000 cps;
(3) cooling to below 40 deg.C, and discharging.
The preparation method of the acrylic pressure-sensitive adhesive tape at least comprises the following steps:
(1) preparation of acrylic pressure-sensitive adhesive: uniformly mixing polyacrylic resin and tackifying resin, adding a curing agent, and uniformly stirring to obtain the acrylic resin-tackifying resin emulsion;
(2) preparation of the substrate: directly coating a 30 wt% release agent toluene solution on the surface of a substrate, and drying to obtain the release agent;
(3) preparation of acrylic pressure sensitive adhesive tape: and directly coating the pressure-sensitive adhesive on the other surface of the base material, drying and rolling to obtain the pressure-sensitive adhesive.
Example 3
Embodiment 3 provides an acrylic pressure sensitive adhesive tape comprising a substrate and an acrylic pressure sensitive adhesive coated on one side of the substrate; the other surface of the substrate is coated with a release coating; the base material is a PE film with the thickness of 0.07mm and is purchased from Dongqiao plastic Co., Ltd, Zhongshan City; the thickness of the release coating is 0.2 mu m, the material is an organic silicon release agent, and the release coating is purchased from chemical industry Co., Ltd, New four seas, Hubei; the curing agent is n-butyl alcohol etherified melamine formaldehyde resin which is purchased from Shanghai Xinhua resin Co., Ltd;
the preparation raw materials of the acrylic pressure-sensitive adhesive at least comprise the following components in parts by weight: 80% of polyacrylic resin, 16% of tackifying resin and 4% of curing agent; the tackifying resin is an alkene terpene resin, the glass transition temperature is 80 +/-5 ℃, and the tackifying resin is purchased from Shanghai Denseur trade company;
the polyacrylic resin is prepared from the following raw materials in parts by weight: 120 parts of monomer I, 30 parts of monomer II, 10 parts of monomer III, 5 parts of initiator and 500 parts of solvent; the monomer I is a mixture of ethyl methacrylate, isobornyl methacrylate and isooctyl acrylate, and the weight ratio is 1: 0.8: 5; the monomer II is a mixture of acrylic acid, glycidyl methacrylate, tridecafluorooctyl methacrylate and dicyclopentadiene maleate, and the weight ratio is 1: 1.5: 1: 1; the monomer III is a mixture of trimethylolpropane triacrylate and p-neopentyl glycol diacrylate, and the weight ratio is 1: 2; the initiator is benzoyl peroxide; the solvent is a mixture of ethyl acetate, isopropanol and toluene, and the volume ratio is 1: 0.5: 1;
the preparation method of the polyacrylic resin comprises the following steps:
(1) adding the monomer I, the monomer II and the monomer III into a reaction kettle, uniformly stirring, adding a solvent, and heating to 60 ℃ in an inert gas environment while stirring;
(2) adding an initiator, stirring and heating to 85 ℃, and stopping the reaction until the solid content of the mixed material is 45 +/-5% and the viscosity is 30000 +/-10000 cps;
(3) cooling to below 40 deg.C, and discharging.
The preparation method of the acrylic pressure-sensitive adhesive tape at least comprises the following steps:
(1) preparation of acrylic pressure-sensitive adhesive: uniformly mixing polyacrylic resin and tackifying resin, adding a curing agent, and uniformly stirring to obtain the acrylic resin-tackifying resin emulsion;
(2) preparation of the substrate: directly coating a 30 wt% release agent toluene solution on the surface of a substrate, and drying to obtain the release agent;
(3) preparation of acrylic pressure sensitive adhesive tape: and directly coating the pressure-sensitive adhesive on the other surface of the base material, drying and rolling to obtain the pressure-sensitive adhesive.
Example 4
Example 4 differs from example 1 in that the monomer I does not comprise ethyl methacrylate.
Example 5
Example 5 differs from example 1 in that monomer I does not include isooctyl acrylate.
Example 6
Example 6 differs from example 1 in that isobornyl methacrylate in the monomer I is replaced by n-nonyl acrylate.
Example 7
Example 7 differs from example 1 in that the monomer II does not comprise glycidyl methacrylate.
Example 8
Example 8 differs from example 1 in that the monomer II does not comprise tridecafluorooctyl methacrylate.
Example 9
Example 9 differs from example 1 in that the monomer II does not comprise dicyclopentadiene maleate.
Example 10
Example 10 differs from example 1 in that the monomer ii is a mixture of acrylic acid and dimethylaminoethyl acrylate in a weight ratio of 1: 1.
example 11
Example 11 differs from example 1 in that monomer III is not included.
Example 12
Example 12 differs from example 1 in that the monomer III is trimethylolpropane triacrylate.
Example 13
Example 13 differs from example 1 in that the initiator is azobisisobutyronitrile and the temperature range used is 50-65 ℃.
Example 14
Example 14 differs from example 1 in that the solvent does not include toluene.
Example 15
Example 15 differs from example 1 in that the solvent does not include isopropanol.
Example 16
Example 16 differs from example 1 in that the tackifying resin is C5 petroleum resin, purchased from puyang corporation of rutaceae chemical limited.
Performance testing
Adhesive tape adhesive property test
1. Initial viscosity: according to GB/T4852-2002 "initial adhesion test method (ball rolling method) of pressure-sensitive adhesive tape, a rolling ball slope stopping test is adopted for testing (the measurement angle is 20 degrees), and the initial adhesion of the adhesive tape is evaluated according to the maximum size of a steel ball which can be adhered by an adhesive surface with a specified length. The steel ball has large grain diameter and the adhesive tape has large initial adhesive property.
And (4) judging the standard: the size of the steel ball is greater than 28 (excluding 28, the same below), and the steel ball is marked as excellent; the size of the steel ball is between 25 and 28 (including 5 and 28, the same below), and is marked as better; the steel ball size is between 20 and 25 and is marked as good; the size of the steel ball is between 15 and 20 and is marked as general; the steel ball size is less than 15 as a difference.
2. Viscosity retention: measured according to the method of GB/T4851-2014, the adhesive tape in the embodiment is cut into a rectangle with the width of 25mm and the length of 100mm, the adhesive tape is attached to hard plates made of different materials, the upper end of the adhesive tape is aligned with a standard line, the redundant part of the lower end of the adhesive tape is cut off, a 2kg compression roller is used for rolling back and forth for 3 times, the hard plates made of different materials and attached with a sample are vertically hung on a test rack after being placed for a period of time, the hard plates are not shaken, a 1kg weight is hung below the test rack, and the time that the adhesive tape falls represents the adhesive force of the adhesive tape.
And (4) judging the standard: the dropping time is more than 90h and is marked as excellent; the falling time is between 80 and 90 hours and is marked as better; the drop time was between 60-80 and was recorded as good; the falling time is between 40 and 60 and is recorded as general; the drop time was below 40h and was reported as poor.
3.180 ° peel strength: according to the GB/T2792-2014 standard, the method is carried out by using a peeling force tester (the peeling rate is 300 mm/min).
And (4) judging the standard: the peel strength is higher than 33N/25mm and is marked as excellent; the peel strength is between 25 and 33N/25mm, which is recorded as better; the peel strength was between 20-25N/25mm and is recorded as good; the peel strength is between 15 and 20N/25mm, and is recorded as general; the peel strength was less than 15N/25mm and was reported as poor.
Second, temperature resistance test
1. High temperature resistance: the adhesive tape for testing is adhered to a steel plate, rolled for 3 times by using a 2kg press roll, kept stand for 20min, then respectively placed into drying ovens with different temperatures (the testing temperature range is 80-250 ℃, and one group is tested at intervals of 10 ℃) and kept for 1h, then the steel plate is taken out of the drying ovens and cooled for 30min, the test adhesive tape is torn off from the steel plate at a constant speed, whether residual adhesive exists on the steel plate or not is observed, and the highest temperature of the residual adhesive does not exist is defined as the high-temperature resistant temperature of the pressure-sensitive adhesive.
And (4) judging the standard: the highest temperature resistance is higher than 200 ℃, and the highest temperature resistance is marked as excellent; the highest temperature resistance is between 100 ℃ and 200 ℃, and is marked as good; the highest temperature resistance is lower than 100 ℃, which is recorded as general.
2. Low temperature resistance: the adhesive tape for testing is adhered to a steel plate, rolled for 3 times by using a 2kg compression roller, kept stand for 20min and then respectively placed into refrigerators with different temperatures (the testing temperature range is-50-0 ℃, and one group is tested at intervals of 10 ℃) and kept for 1h, then the steel plate is taken out of the refrigerators to be cooled for 30min, the test adhesive tape is torn off from the steel plate at a constant speed, whether residual glue exists on the steel plate or not is observed, and the lowest temperature of the residual glue is defined as the low-temperature resistant temperature of the pressure-sensitive adhesive.
And (4) judging the standard: the lowest temperature resistant temperature is lower than-30 ℃, and is marked as excellent; the lowest temperature resistance is between minus 10- (-30) DEG C and is marked as good; the lowest temperature resistant temperature is higher than-10 ℃, which is recorded as general.
Third, water resistance
Water absorption: cutting the adhesive tape into square blocks of 2cm multiplied by 2cm, weighing and recording as ma(g) Then soaking the pressure sensitive adhesive in deionized water for 48h, taking out, quickly sucking off excessive water on the surface of the pressure sensitive adhesive by using filter paper, weighing and recording as mb(g) In that respect The water absorption of the pressure-sensitive adhesive is expressed by water absorption rate [ (m)b-ma)/ma]And (5) calculating the x is 100%.
And (4) judging the standard: the water absorption is lower than 1%, and is marked as excellent; the water absorption is 1-5%, and is marked as good; the water absorption is 5-10%, and is recorded as general; the water absorption was above 10% and is reported as poor.
The test results are shown in Table 1.
TABLE 1 results of the Performance test of examples 1 to 16
Figure BDA0002672972830000181
Figure BDA0002672972830000191
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.

Claims (5)

1. The acrylic pressure-sensitive adhesive tape is characterized by comprising a base material and acrylic pressure-sensitive adhesive coated on one side of the base material; the other side of the base material is coated with a release coating; the preparation raw materials of the acrylic pressure-sensitive adhesive at least comprise the following components in percentage by weight: 75-90% of polyacrylic resin, 5-20% of tackifying resin and 1-10% of curing agent; the polyacrylic resin is prepared from the following raw materials in parts by weight: 80-120 parts of monomer I, 10-30 parts of monomer II, 1-10 parts of monomer III, 0.1-5 parts of initiator and 500 parts of solvent 200-one; the monomer I is a mixture of ethyl methacrylate, isobornyl methacrylate and isooctyl acrylate; the weight ratio of the ethyl methacrylate to the isobornyl methacrylate to the isooctyl acrylate is 1: (0.3-0.8): (1-5); the monomer II is a mixture of acrylic acid, glycidyl methacrylate, tridecafluorooctyl methacrylate and dicyclopentadiene maleate; the weight ratio of the acrylic acid to the glycidyl methacrylate to the tridecafluorooctyl methacrylate to the dicyclopentadiene maleic acid ester is 1: (0.5-1.5): (0.1-1): (0.1-1); the monomer III is a mixture of trimethylolpropane triacrylate and neopentyl glycol diacrylate; the weight ratio of the trimethylolpropane triacrylate to the diacrylic acid to the neopentyl glycol ester is 1: (0.5-2); the initiator is benzoyl peroxide; the tackifying resin is an alkene terpene resin; the glass transition temperature of the alkene terpene resin is 70-100 ℃; the boiling point of the solvent is 70-100 ℃; the solvent is a mixture of ethyl acetate, isopropanol and toluene; the volume ratio of the ethyl acetate to the isopropanol to the toluene is 1: (0.05-0.5): (0.1-1).
2. The acrylic pressure sensitive adhesive tape according to claim 1, wherein the substrate has a thickness of 0.01 to 0.5 mm; the thickness of the pressure-sensitive adhesive is 10-50 μm.
3. The acrylic pressure sensitive adhesive tape according to claim 1, wherein the preparation method of the polyacrylic resin comprises the steps of:
(1) adding the monomer I, the monomer II and the monomer III into a reaction kettle, uniformly stirring, adding a solvent, and heating to 45-65 ℃ in an inert gas environment while stirring;
(2) adding an initiator, stirring and heating to 70-85 ℃, and stopping the reaction until the solid content of the mixed material is 30-70% and the viscosity is 1000-50000 cps;
(3) cooling to below 40 deg.C, and discharging.
4. A method for preparing an acrylic pressure sensitive adhesive tape according to any one of claims 1 to 3, characterized by comprising at least the following steps:
(1) preparation of acrylic pressure-sensitive adhesive: uniformly mixing polyacrylic resin and tackifying resin, adding a curing agent, and uniformly stirring to obtain the acrylic resin-tackifying resin emulsion;
(2) preparation of the substrate: directly coating a solution containing a release agent on the surface of a base material, and drying to obtain the release agent;
(3) preparation of acrylic pressure sensitive adhesive tape: and directly coating the pressure-sensitive adhesive on the other surface of the base material, drying and rolling to obtain the pressure-sensitive adhesive.
5. Use of the acrylic pressure sensitive adhesive tape according to any one of claims 1 to 4, wherein the acrylic pressure sensitive adhesive tape is used in the field of photovoltaic panel fixation.
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CN114316820A (en) * 2021-12-06 2022-04-12 烟台德邦科技股份有限公司 Pole piece shielding protection adhesive tape for lithium battery production process and preparation method thereof
CN115011266B (en) * 2022-06-06 2024-03-19 东莞澳中新材料科技股份有限公司 Wrapping film for power battery
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