KR20110022854A - Acrylic pressure-sensitive adhesive, method for preparing the same and surface finishing material comprising the same - Google Patents

Abstract

PURPOSE: An acrylic pressure-sensitive adhesive is provided to ensure excellent initial and final adhesive forces, strippability and stress, and to ensure application to various adherent included at one side or both sides of a substrate. CONSTITUTION: A method for preparing an acrylic pressure-sensitive adhesive comprises: a first step for stirring a mixture consisting of 80-90 parts by weight of alkyl(meth)acrylic acid ester with C2-14 alkyl groups, 1-5 parts by weight of crosslinkable group-containing monomer, 1-5 parts by weight of methyl(meth)acrylate monomer, 5-10 parts by weight of vinyl acetate monomer, and a solvent, and purging the mixture with inert gas; injecting a polymerization initiator three times while purging the mixture with inert gas; and injecting additives to control viscosity.

Description

Acrylic pressure-sensitive adhesive, its manufacturing method and surface finishing material comprising the same {Acrylic pressure-sensitive adhesive, method for preparing the same and surface finishing material comprising the same}

The present invention relates to an acrylic pressure-sensitive adhesive, a method for preparing the same, and a surface finishing material including the same. (Iii) 80 to 90 parts by weight of an alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms in an alkyl group, ii) a crosslinkable functional group 1 to 5 parts by weight of the monomer, iii) 1 to 5 parts by weight of methyl (meth) acrylate monomer and iii) 5 to 10 parts by weight of vinyl acetate monomer, an acrylic pressure-sensitive adhesive formed by copolymerization, a method for preparing the same, and a surface finish comprising the same It is about.

Recently, a surface finish of a sticker type, which is an advanced form, has been used as an interior / exterior material and interior material of a building instead of an existing veneer or sheet. Sticker type surface finishes are generally made of an adhesive layer on a base sheet made of a polymer material. Sticker type surface finishing materials are easier to construct and simpler work schedule than existing surface finishing materials. As a result, the number of new buildings is decreasing and the number of remodeling projects is increasing. Surface finishing materials that can feel the texture of the wood is used in various fields such as tables, counters, partitions, built-in cabinets, walls, doorways, doors, door doors. In addition, the base sheet of the surface finish of the sticker type can be used in addition to the polymer material, metal, leather and fabric material has a wide range of choices depending on the atmosphere and use desired by the consumer.

The surface finish of the sticker type is easy to be installed with various materials and patterns of the base material layer, and excellent peel force, stress, and adhesive force of the pressure-sensitive adhesive layer are required to be attached to various adhered surfaces.

Although the adhesive for surface finishing materials currently used is an acrylic adhesive or an adhesive based on a silicone polymer as a main component, sufficient adhesive force is not exhibited. In addition, development of an adhesive layer suitable for various materials such as wood, leather, fabric, metal, and steel as well as polymer material is required.

An object of the present invention is to solve the problems of the prior art as described above, to provide an acrylic pressure-sensitive adhesive having excellent initial adhesive strength and final adhesive strength, excellent peel force and stress, a manufacturing method thereof, and a surface finish comprising the same.

The present invention provides a means for solving the above problems, i) 80 to 90 parts by weight of an alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms of an alkyl group, ii) 1 to 5 parts by weight of a crosslinkable functional group-containing monomer, ) 1 to 5 parts by weight of methyl (meth) acrylate monomer and iii) 5 to 10 parts by weight of vinyl acetate monomer to provide an acrylic pressure-sensitive adhesive.

The present invention provides another means for solving the above problems, 80 to 90 parts by weight of an alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms of an alkyl group, 1 to 5 parts by weight of a crosslinkable functional group-containing monomer, methyl (meth) A first step of purging the mixture of 1 to 5 parts by weight of the acrylate monomer, 5 to 10 parts by weight of the vinyl acetate monomer and the solvent with an inert gas while stirring; A second step of dividing the polymerization initiator into three portions while purging with an inert gas; And it provides a method for producing an acrylic pressure-sensitive adhesive comprising a third step of adjusting the viscosity by adding an additional solvent.

The present invention is another means for solving the above problems, the substrate layer; And a pressure-sensitive adhesive layer formed on one or both surfaces of the substrate layer and containing an acrylic pressure-sensitive adhesive according to the present invention.

The present invention has excellent initial and final adhesion, and excellent peel force and stress. In addition, the surface finish including the acrylic pressure-sensitive adhesive on one side or both sides of the base material layer, such as polymer resin, wood, leather, fabric, or metal may be applied to various adhered surfaces.

(I) 80 to 90 parts by weight of alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms of alkyl group, ii) 1 to 5 parts by weight of crosslinkable functional group-containing monomer, i) It relates to an acrylic pressure-sensitive adhesive formed by copolymerizing 1 to 5 parts by weight of methyl (meth) acrylate monomer, and 5 to 10 parts by weight of vinyl acetate monomer. The acrylic pressure sensitive adhesive according to the present invention is characterized by excellent initial adhesive strength and final adhesive strength, excellent peeling force and stress.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

Acrylic adhesive of the present invention (iii) 80 to 90 parts by weight of an alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms of the alkyl group, ii) 1 to 5 parts by weight of a crosslinkable functional group-containing monomer, i) methyl (meth) acrylate It is formed by copolymerizing 1 to 5 parts by weight of monomers, and i) 5 to 10 parts by weight of vinyl acetate monomer.

The acrylic pressure-sensitive adhesive of the present invention mainly contains an alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms as the alkyl group. The alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms of the alkyl group is not limited thereto, for example, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylic Late, n-butyl (meth) acrylate, t-butyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl As (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate or tetradecyl (meth) acrylate, etc. are mentioned in this invention alone or two. It can mix and use species.

If the number of carbon atoms of the alkyl group is outside the above range, the glass transition temperature of the pressure-sensitive adhesive is high, or since the adhesion is difficult to control, the number of carbon atoms of the alkyl group is preferably 2 to 14.

The content of the alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms of the alkyl group is preferably 80 to 90 parts by weight based on 100 parts by weight of the total monomers for controlling adhesion and cohesion.

The acrylic pressure-sensitive adhesive of the present invention contains an alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms as its main component, and includes ii) a crosslinkable functional group-containing monomer as a copolymerization component in order to improve cohesion and adhesion to the adhered surface. do.

Said ii) crosslinkable functional group containing monomer is not limited to this, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate Hydroxyl group-containing monomers such as 2-hydroxyethylene glycol (meth) acrylate or 2-hydroxypropylene glycol (meth) acrylate; Carboxyl group-containing monomers such as acrylic acid, methacrylic acid, acrylic acid duplex, itaconic acid, carboxyethyl acrylate, carboxypentyl acrylate, maleic acid, or fumaric acid; And nitrogen-containing monomers such as acrylamide, N-vinyl pyrrolidone, or N-vinyl caprolactam, and the like, and in the present invention, these may be used alone or in combination of two or more thereof.

The content of the crosslinkable functional group-containing monomer ii) is preferably 1 to 5 parts by weight, and has excellent initial and final adhesive strength, excellent peeling force and stress within this range.

The acrylic pressure-sensitive adhesive of the present invention comprises, in addition to the above monomers, a) i) methyl (meth) acrylate monomer and (i) vinyl acetate monomer having a relatively high glass transition temperature as a copolymerization component.

By including the above-mentioned iii) methyl (meth) acrylate monomer and iii) vinyl acetate monomer as a copolymerization component, it is possible to prevent contamination by leaving no adhesive component on the adhered surface when removing the acrylic adhesive. (Iii) The content of the methyl (meth) acrylate monomer is preferably 1 to 5 parts by weight, the initial and final adhesion is excellent in this range, there is an excellent peeling force and stress. In addition, the content of the vinyl acetate monomer iii) is preferably 5 to 10 parts by weight, and has excellent initial and final adhesive strength within this range, and excellent peeling force and stress.

The acrylic pressure sensitive adhesive according to the present invention may further include a tackifier, a stabilizer, a thickener, a filler, or a crosslinking agent in addition to the copolymer component.

The invention also

80 to 90 parts by weight of an alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms of an alkyl group, 1 to 5 parts by weight of a crosslinkable functional group containing monomer, 1 to 5 parts by weight of methyl (meth) acrylate monomer, and 5 to 5 parts of vinyl acetate monomer A first step of purging the mixture containing 10 parts by weight and the solvent with an inert gas while stirring;

A second step of dividing the polymerization initiator into three portions while purging with an inert gas; And

It relates to a method for producing an acrylic pressure-sensitive adhesive comprising a third step of adjusting the viscosity by adding an additional solvent.

The first step of the invention is a preparatory step prior to the initiation of the polymerization, which allows the polymerization of alkyl (meth) acrylic acid ester monomers and vinyl acetate monomers at lower temperatures. Generally, high temperature conditions are required to polymerize the alkyl (meth) acrylic acid ester monomer and the vinyl acetate monomer, but in the present invention, the acrylic copolymer can be polymerized at a lower temperature by purging with an inert gas.

The solvent that can be used in the first step is not limited thereto, and for example, toluene, acetone, heptane, ethyl acetate, or the like can be used. In addition, the inert gas is preferably nitrogen, and the purge time is preferably 15 to 30 minutes.

In the second step of the present invention, radicals are generated to activate monomers to form an acrylic copolymer. In the second step, the polymerization initiator is divided into three portions while purging with an inert gas to prepare an acrylic copolymer having a high molecular weight and a narrow molecular weight distribution.

The polymerization initiator that can be used in the second step is not limited thereto, and for example, a peroxide-based compound such as benzoyl peroxide, acetyl peroxide or lauroyl peroxide can be used.

In addition, the polymerization temperature of the second step is preferably 60 to 70 ℃.

In general, when a vinyl acetate monomer is included, high temperature polymerization conditions are required, but the second step may be performed at 60 to 70 ° C., thereby making polymerization easier.

The third step of the present invention is to adjust the viscosity by adding an additional solvent to the acrylic copolymer formed in the second step. The additional solvent is not particularly limited, but for example, toluene, acetone, heptane, ethyl acetate, or the like can be used.

After the third step may further comprise the step of adding a tackifier, stabilizer, thickener, filler, or crosslinking agent.

The invention also

Substrate layer; And

Pressure-sensitive adhesive layer formed on one side or both sides of the base layer, containing an acrylic pressure-sensitive adhesive according to the present invention

It relates to a surface finish comprising a. The surface finish according to the present invention is excellent in peeling force, stress and adhesion to the adhered surface, such as plywood, gypsum board, asbestos straight, and can be installed in flat and curved surfaces.

The surface finish of the present invention includes a pressure-sensitive adhesive layer formed from an acrylic pressure-sensitive adhesive according to the present invention on one or both sides of the base layer, the base layer is not particularly limited. For example, polymer resin, wood, leather, fabric, metal, etc. can be used as a base layer.

The method of forming the pressure-sensitive adhesive layer on one or both sides of the base layer is not particularly limited, and the method of applying and drying the pressure-sensitive adhesive using a bar coder or the like directly on the surface of the base layer or the pressure-sensitive adhesive on the surface of the peelable base material After coating and drying, a method of transferring the pressure-sensitive adhesive layer formed on the surface of the peelable substrate to the substrate layer and aging may be applied.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, which are intended to help a specific understanding of the present invention, and the scope of the present invention is not limited by the Examples.

Example 1

50 parts by weight of 2-Ethyl Hexyl Acrylate (2-EHA) and 33 parts of Butyl Acrylate (BA) in a reactor equipped with a thermometer, agitator, dropping funnel, nitrogen introduction tube and reflux condenser A monomer mixture composed of 4 parts by weight of methyl acrylate (MA), 4 parts by weight of acrylic acid (AA), and 9 parts by weight of vinyl acetate (VA) was added thereto. 139 parts by weight of ethyl acetate (EA) was added as a solvent, and nitrogen gas was purged for 20 minutes to remove oxygen. 0.1 parts by weight of benzoyl peroxide was added to the polymerization initiator three times, and ethyl acetate was further added during the reaction to prepare an acrylic pressure-sensitive adhesive.

[Test Example]

The pressure-sensitive adhesive prepared in Examples and Comparative Examples was applied to a release paper and dried, and then laminated on one side of a polyethylene terephthalate (PET) sheet to prepare an adhesive product specimen, and then the adhesive force (kg / in), room temperature, and low temperature 90 °. As a result of measuring creep strength and 180 ° peeling, it was confirmed that the initial and final adhesive strength was excellent, and the stress and peeling strength were excellent.

Claims (6)

Iii) 80 to 90 parts by weight of an alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms, ii) 1 to 5 parts by weight of a crosslinkable functional group-containing monomer, iii) 1 to 5 parts by weight of a methyl (meth) acrylate monomer And iii) an acrylic pressure-sensitive adhesive formed by copolymerizing 5 to 10 parts by weight of vinyl acetate monomer. The method of claim 1, Iii) The alkyl (meth) acrylate monomer having 2 to 14 carbon atoms in the alkyl group is ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate , t-butyl (meth) acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) Acrylic acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate, tetradecyl (meth) acrylate is one or more selected from the group consisting of acrylic pressure-sensitive adhesive. The method of claim 1, Ii) The crosslinkable functional group-containing monomer is at least one member selected from the group consisting of hydroxyl group-containing monomers, carboxyl group-containing monomers and nitrogen-containing monomers. 80 to 90 parts by weight of an alkyl (meth) acrylic acid ester monomer having 2 to 14 carbon atoms of an alkyl group, 1 to 5 parts by weight of a crosslinkable functional group containing monomer, 1 to 5 parts by weight of methyl (meth) acrylate monomer, and 5 to 5 parts of vinyl acetate monomer A first step of purging the mixture containing 10 parts by weight and the solvent with an inert gas while stirring; A second step of dividing the polymerization initiator into three portions while purging with an inert gas; And Method of producing an acrylic pressure-sensitive adhesive comprising a third step of adjusting the viscosity by adding an additional solvent. Substrate layer; And A pressure-sensitive adhesive layer formed on one side or both sides of the base layer and containing the acrylic pressure-sensitive adhesive according to any one of claims 1 to 3. Surface finish comprising a. The method of claim 5, And the substrate layer is a polymer resin, wood, leather, fabric, or metal.