KR20170016161A

KR20170016161A - Double-sided tape for one piece type cellphone battery

Info

Publication number: KR20170016161A
Application number: KR1020150109577A
Authority: KR
Inventors: 고세윤; 홍성욱
Original assignee: 주식회사 켐코
Priority date: 2015-08-03
Filing date: 2015-08-03
Publication date: 2017-02-13

Abstract

The present invention relates to a double-sided tape for integrated battery attachment of a cellular phone, and more particularly to a double-sided tape for integrated battery attachment of a cellular phone, which comprises a base layer and a top layer And an adhesive layer.
Since the double-sided tape for integrated battery attachment of the above-mentioned mobile phone has a simple manufacturing process, it can reduce the manufacturing cost and manufacturing time, and it is easy to detach and attach to the battery because of excellent elasticity and elongation, Thereby improving the efficiency of the process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double-

More particularly, the present invention relates to a double-sided adhesive tape for a mobile phone. More particularly, the present invention relates to a double-sided tape for attaching a battery to a mobile phone, and more particularly, The present invention relates to a double-sided adhesive tape for attaching an integral battery of a mobile phone, which improves the efficiency of repairing a product to which an integral battery is applied.

Conventionally, the detachable battery is mainly used for a mobile phone battery. However, the detachable battery requires separate parts such as a separator and a cover of the battery because the battery must be separated freely from the mobile phone device, so that the manufacturing cost is increased, There is a problem of increasing the volume of the mobile phone and restricting the design of the mobile phone.

In addition, since the detachable battery needs to frequently open the cover for the battery in order to replace the battery, the cover of the mobile phone with excellent mechanical strength must be applied, which causes a problem of limiting the material of the portable phone.

That is, a material having excellent elasticity such as plastic as a material of a mobile phone device is easy to apply, but a material having a low elasticity such as a metal is limited in application because the process of opening and closing the mobile phone case may repeatedly cause deformation.

In order to solve the above problems, an integral type battery in which a battery is permanently interposed in a mobile phone device is often used instead of a detachable type. In the past, a double-sided tape generally used for fixing the integrated battery to a mobile phone device However, since general double-sided tape has low elasticity and elongation of base material, adhesive of adhesive layer easily cures and reworkability is low, it is difficult to replace single battery in battery replacement or repair process, There is a problem in that it can be broken.

Korean Patent Registration No. 10-1417188 (2014.06.30). Korean Patent Publication No. 10-2002-0065451 (Aug. 13, 2002).

It is an object of the present invention to improve the efficiency of the process of repairing a product having an integrated battery because rework can be performed because the manufacturing process is simple and the manufacturing cost and manufacturing time are reduced and the elasticity and elongation rate are excellent. To provide an integrated battery-mounting double-sided tape for a mobile phone.

An object of the present invention is to provide a method for attaching an integrated battery to a mobile phone, which comprises a base layer and an adhesive layer formed on the upper and lower surfaces of the base layer and composed of a rubber mixture, an acrylic mixture, a curing agent, Double-sided tape.

According to a preferred feature of the present invention, the base layer has a thickness of 30 to 100 탆 and is made of a thermoplastic polyurethane film.

According to a further preferred feature of the present invention, the adhesive layer is formed to have a thickness of 10 to 25 탆.

According to a further preferred feature of the present invention, the adhesive layer comprises 100 parts by weight of a rubber mixture, 4 to 10 parts by weight of an acrylic mixture, 0.01 to 0.1 parts by weight of a curing agent, 8 to 12 parts by weight of a tackifier resin and 1 to 5 parts by weight of a surfactant .

According to a further preferred feature of the present invention, the rubber mixture comprises 100 parts by weight of a styrene butadiene styrene copolymer, 40 to 60 parts by weight of polybutadiene, 15 to 25 parts by weight of a tackifier resin, 40 to 60 parts by weight of a petroleum resin, To 55 parts by weight.

According to an even more preferred feature of the present invention, the acrylic mixture comprises 100 parts by weight of solvent, 60 to 70 parts by weight of butyl acrylate, 25 to 35 parts by weight of 2-ethylhexyl acrylate, 4 to 20 parts by weight of 2-hydroxyethyl methacrylate, 6 parts by weight and 0.05 to 0.15 parts by weight of a polymerization initiator.

According to a further preferred feature of the present invention, the tackifier resin is made of at least one selected from the group consisting of silicone, acrylic, rubber and urethane.

The double-sided tape for integrated battery attachment according to the present invention has a simple manufacturing process, which reduces manufacturing cost and manufacturing time, and has excellent elasticity and elongation, And shows an excellent effect of improving the efficiency of the repairing process.

1 is an exploded perspective view showing a double-sided tape for an integral battery attachment of a cellular phone according to the present invention.

Hereinafter, preferred embodiments of the present invention and physical properties of the respective components will be described in detail with reference to the accompanying drawings. However, the present invention is not limited thereto, And this does not mean that the technical idea and scope of the present invention are limited.

The double-sided tape for integral battery attachment of a cellular phone according to the present invention is formed on the base layer 10 and the upper and lower surfaces of the base layer 10 and comprises a rubber mixture, an acrylic mixture, a curing agent, a tackifying resin and a surfactant And an adhesive layer (20).

The base layer 10 serves as a base material for a double-sided tape for integral battery attachment of a cellular phone according to the present invention. The base layer 10 serves to improve the dimensional stability of the double-sided tape. The base layer 10 has a thickness of 30 to 100 탆 and is made of a thermoplastic polyurethane film .

The base layer 10 made of the thermoplastic polyurethane film has excellent abrasion resistance and workability and is excellent in elasticity and elongation so that a double-sided tape which does not cause damage to the surface of the battery or internal parts of the mobile phone It serves to provide.

If the thickness of the base layer 10 is less than 30 m, the stability of the double-sided tape is lowered. If the thickness of the base layer 10 exceeds 100 m, the elasticity and elongation of the double- Can not be shown.

The adhesive layer 20 is formed on the upper and lower surfaces of the base layer 10 to a thickness of 10 to 25 탆 and is composed of a rubber mixture, an acrylic mixture, a curing agent, a tackifying resin and a surfactant, And a surfactant in an amount of 4 to 10 parts by weight, a curing agent in an amount of 0.01 to 0.1 parts by weight, a tackifier resin in an amount of 8 to 12 parts by weight and a surfactant in an amount of 1 to 5 parts by weight, So that the tape can be easily detached and attached to the integral battery.

If the thickness of the adhesive layer 20 is less than 10 mu m, the adhesive strength of the adhesive layer 20 is lowered. If the thickness of the adhesive layer is more than 25 mu m, the adhesive strength of the adhesive layer 20 is not significantly improved. Thereby increasing the cost and the overall thickness of the double-sided tape.

The rubber mixture is composed of 100 parts by weight of a styrene butadiene styrene copolymer, 40 to 60 parts by weight of a polybutadiene, 15 to 25 parts by weight of a tackifier resin, 40 to 60 parts by weight of a petroleum resin, And 45 to 55 parts by weight. The rubber mixture composed of the above components serves to provide an adhesive layer exhibiting excellent detachability.

In this case, the tackifier resin is contained in an amount of 15 to 25 parts by weight, and is composed of at least one selected from the group consisting of silicone, acrylic, rubber, and urethane. The tackifier resin plays a role of improving adhesion to the adhesive layer, It is preferable to use an acrylic adhesive resin having excellent properties.

The higher the content of the component having a lower molecular weight, the higher the cohesive strength. On the contrary, the higher the content of the higher molecular weight substance, the higher the cohesive strength. Therefore, the polydispersity index (PDI) of the acrylic tackifier resin is preferably 6 to 15, 5 to 12 is preferably used.

The composition of the tackifier resin is not particularly limited, but may include an acrylate monomer, and the acrylate monomer may be butyl acrylate, butyl methacrylate, hexyl acrylate, hexyl methacrylate, n-octyl Acrylate, n-octyl methacrylate, isooctyl acrylate, isooctyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, isononyl acrylate and isononyl methacrylate It is preferable to use an acrylic ester monomer having a glass transition temperature in the range of -80 占 폚 to -50 占 폚 in consideration of the adhesive force in the present invention. It is preferable to use methacrylic acid, 2-methacryloxy Acetic acid, 3-methacryloxypropyl acid, 4-methacryloxybutyric acid, fumar Hydroxyethyl methacrylate, 2-hydroxypropylmethacrylate, 4-hydroxybutylmethacrylate, 6-hydrohexylmethacrylate, 4-hydroxybutylmethacrylate, 4-hydroxybutylmethacrylate, A carboxyl group-containing monomer comprising at least one member selected from the group consisting of 8-hydroxyoctyl methacrylate, 2-hydroxyethylene glycol methacrylate, acrylamide as a nitrogen-containing monomer, and N-vinylcaprolactam.

At this time, the solvent used for the rubber mixture is preferably toluene.

4 to 10 parts by weight of the acrylic mixture is mixed with 100 parts by weight of solvent, 60 to 70 parts by weight of butyl acrylate, 25 to 35 parts by weight of 2-ethylhexyl acrylate, 4 to 6 parts by weight of 2-hydroxyethyl methacrylate And 0.05 to 0.15 part by weight of a polymerization initiator. It is preferable that the above solvent is prepared by mixing butyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl methacrylate, However, it serves to provide an adhesive layer 20 having excellent adhesive chemical resistance and the like.

If the content of the acrylic mixture is less than 4 parts by weight, the above-mentioned effect is insignificant. If the content of the acrylic mixture exceeds 10 parts by weight, the adhesive strength of the pressure-sensitive adhesive layer 20 is excessively increased.

At this time, it is preferable that the solvent is a mixture of ethyl acetate and toluene in a weight ratio of 1: 1.

The most common method of the conventional adhesive synthesis method is a batch reaction method in which an acrylic polymer, an organic solvent, and a polymerization initiator are mixed and stirred in one reaction vessel, and then heated and reacted at a time. It is mainly used because of simplicity and convenience of manufacturing process, but it has a disadvantage that it is difficult to control for a temporary explosive reaction and the use amount of toluene is high.

In the above-mentioned batch reaction, toluene is used as a diluent for controlling the instantaneous heat generated during the synthesis of the pressure-sensitive adhesive, controlling the viscosity of the synthesized pressure-sensitive adhesive, and used as an additive for imparting the coating function and the like. Usage is very high.

The above-mentioned curing agent is contained in an amount of 0.01 to 0.1 part by weight and serves to cure the acrylic mixture to exhibit adhesive performance. Any conventional curing agent capable of curing the acrylic mixture can be used without any particular limitation It is preferable to use an epoxy curing agent.

If the content of the curing agent is less than 0.01 part by weight, the above effect is insufficient. If the content of the curing agent is more than 0.1 parts by weight, the acrylic mixture is excessively cured to improve the adhesive performance of the adhesive layer 20, .

The tackifier resin is contained in an amount of 8 to 12 parts by weight, and is composed of at least one selected from the group consisting of silicone, acrylic, rubber and urethane, and has a role of improving adhesion to the adhesive layer. It is preferable to use a superior acrylic adhesive resin.

Hereinafter, the tackifier resin has the same components and functions as the tackifier resin used in the rubber mixture, and therefore, a description thereof will be omitted.

The surface active agent is contained in an amount of 1 to 5 parts by weight and serves to lower the surface tension of the adhesive layer 20 to provide an adhesive layer 20 having excellent smoothness. And the like can be used as long as they can lower the surface tension of the components constituting the pressure-sensitive adhesive layer 20 composed of a polymer, a mixture, or the like.

When the content of the surfactant is less than 1 part by weight, the above effect is insignificant. When the content of the surfactant is more than 5 parts by weight, the surface tension of the components constituting the adhesive layer 20 becomes too low, .

As described above, the double-sided tape for integral battery attachment of the cellular phone of the present invention comprising the base layer 10 and the adhesive layer 20 is prepared by applying a composition for forming the adhesive layer 20 to a substrate having releasability and curing the adhesive layer 20 And then the adhesive layer 20 is formed on the upper and lower surfaces of the base layer 10.

At this time, the application of the composition for forming the adhesive layer 20 may be performed by a conventional double-sided tape manufacturing method such as a comma coating, a bar coating method, a reverse roll coating method, a knife coating method, a roll knife coating method, a gravure coating method, A method used in the above-mentioned case may be used.

The above-mentioned releasable base material is subjected to a silicon release treatment to exhibit excellent releasability, and is excellent in releasability due to its excellent releasability, and can be used in a wide range of applications such as polyethylene terephthalate, polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, polyvinyl chloride, A resin film such as polyethylene terephthalate, polystyrene, polycarbonate, fluorine resin, low density polyethylene, triacetylcellulose and the like, or one selected from the group consisting of a thermoplastic film, a coated paper, a glossy paper and a laminated paper, It is removed before.

Hereinafter, a method of manufacturing a double-sided tape for integral battery attachment of a cellular phone according to the present invention will be described by way of examples.

&Lt; Preparation Example 1 > Preparation of rubber mixture

100 parts by weight of a styrene-butadiene styrene copolymer, 50 parts by weight of a polybutadiene, 20 parts by weight of a tackifier resin and 50 parts by weight of a petroleum resin were charged into a stirrer, and 50 parts by weight of toluene was added as a reaction solvent. A mixture was prepared.

&Lt; Preparation Example 2 > Preparation of acrylic mixture

50 parts by weight of ethyl acetate and 50 parts by weight of toluene were added as a reaction solvent to a reactor equipped with a stirrer, and 65 parts by weight of butyl acrylate monomer (BAM), 30 parts by weight of 2-ethylhexyl acrylate monomer (2-EHA) 5 parts by weight of 2-hydroxyethylmethacrylate monomer (2-HEMA) and 0.1 part by weight of AIBN (Azobis isobutyronitrile) as a polymerization initiator were added and reacted to prepare an acrylic mixture having a solid content of 40%.

&Lt; Example 1 >

100 parts by weight of the rubber mixture prepared in Preparation Example 1, 7 parts by weight of the acrylic mixture prepared in Preparation Example 2, 0.07 parts by weight of the epoxy curing agent, 10 parts by weight of the tackifier resin and 3 parts by weight of the surfactant were introduced into a stirrer, To prepare a composition for producing an adhesive layer. The composition for the preparation of the adhesive layer was cured on the surface of a silicone-modified polyethylene terephthalate film using a comma coating method and then applied to a thickness of 20 탆 The pressure-sensitive adhesive layer was cured to prepare a pressure-sensitive adhesive layer, which was laminated with the upper and lower surfaces of a thermoplastic polyurethane film having a thickness of 50 占 퐉 to prepare a double-sided adhesive tape for cell- The terephthalate film is removed from the adhesive layer before using the double-sided tape.)

The double-sided tape for integrated battery attachment of the mobile phone manufactured through Example 1 can be reworked because the manufacturing process is simple and the manufacturing cost and manufacturing time are reduced and the elasticity and elongation are excellent, The efficiency of the process of repairing a product such as a cell phone with a battery can be improved.

10; The substrate layer
20; Adhesive layer

Claims

A base layer; And
And an adhesive layer formed on the upper and lower surfaces of the base layer, the adhesive layer comprising a rubber mixture, an acrylic mixture, a curing agent, a tackifying resin, and a surfactant.

The method according to claim 1,
Wherein the base layer has a thickness of 30 to 100 占 퐉 and is made of a thermoplastic polyurethane film.

The method according to claim 1,
Wherein the adhesive layer is formed to a thickness of 10 to 25 占 퐉.

The method according to claim 1 or 3,
Characterized in that the adhesive layer comprises 100 parts by weight of a rubber mixture, 4 to 10 parts by weight of an acrylic mixture, 0.01 to 0.1 parts by weight of a curing agent, 8 to 12 parts by weight of a tackifier resin and 1 to 5 parts by weight of a surfactant Double - sided adhesive tape.

The method of claim 4,
Wherein the rubber mixture comprises 100 parts by weight of a styrene butadiene styrene copolymer, 40 to 60 parts by weight of polybutadiene, 15 to 25 parts by weight of a tackifier resin, 40 to 60 parts by weight of a petroleum resin and 45 to 55 parts by weight of a solvent. Double-sided tape for integrated battery.

The method of claim 4,
The acrylic mixture contains 100 parts by weight of a solvent, 60 to 70 parts by weight of butyl acrylate, 25 to 35 parts by weight of 2-ethylhexyl acrylate, 4 to 6 parts by weight of 2-hydroxyethyl methacrylate and 0.05 to 0.15 weight Wherein the battery is a double-sided tape for attaching an integral battery of a mobile phone.

The method of claim 4,
Wherein the tackifier resin is at least one selected from the group consisting of silicone, acrylic, rubber, and urethane.