KR101776871B1 - Self adhesive sheet for packaging - Google Patents

Abstract

Disclosed is a self-adhesive sheet for packing. More specifically, the self-adhesive sheet comprises: a sheet layer; and an adhesive layer formed on one side of the sheet layer and composed of nitrile butadiene rubber, styrene butadiene rubber, an antifoamer, a tackifier, and a thickener. The self-adhesive sheet retains excellent adhesion strength without reduction in adhesiveness even after the repetitive attachment and detachment with objects or after a long period of time, and also ensures outstanding heat resistance, acid resistance, and electric insulation properties.

Description

{SELF ADHESIVE SHEET FOR PACKAGING}

More particularly, the present invention relates to a pressure-sensitive self-adhesive sheet for packaging, and more particularly to a pressure-sensitive self-adhesive sheet for packaging, which is excellent in heat resistance, acid resistance and electrical insulation Sensitive adhesive sheet for packaging.

Since the self-adhesive sheet itself has an adhesive force, it can be repeatedly adhered to and detached from the adherend without using an adhesive. The self-adhesive sheet can be extensively used for advertising, decorative purposes, electronic parts protection, .

The self-adhesive sheet is particularly suitable when it is necessary to preserve the state of the product such as an electronic part or a courier product because the self-adhesive sheet does not exhibit the adhesive property to the product to be packaged and only the self-

Such a self-adhesive sheet is mainly composed of polyethylene, polypropylene and ethylene vinyl acetate as a base resin, and a tackifier, a plasticizer and the like are applied as an additive in order to impart adhesive force, flexibility and the like thereto have.

As a representative example, there is a self-adhesive film mainly made of polyethylene, which is disclosed in Japanese Laid-Open Patent Publication No. 2014-34171. This patent forms a self-adhesive layer on one side of a polyethylene foam layer, Wax emulsion or modified olefin resin emulsion.

However, conventional self-adhesive films such as the self-adhesive films of this patent have a limitation in securing a sufficient adhesive strength and have a problem in that they have poor adhesive strength over time and thus have difficulty in securing stable adhesive performance.

Thus, in Korean Patent Laid-open Publication No. 10-2015-0029583, attempts have been made to obtain a pressure-sensitive adhesive property using a polyalkylene carbonate resin, but this was also insufficient in obtaining sufficient adhesive strength and adhesive stability.

Japanese Patent Application Laid-Open No. 2014-034171 Korean Patent Publication No. 10-2015-0029583

The disclosed contents provide a self-adhesive sheet for packaging which exhibits excellent heat resistance, acid resistance, electrical insulation, and the like, as well as maintaining excellent adhesive strength without deteriorating adhesive strength even when a long time has elapsed or adhesion and desorption with an adherend are repeated will be.

In one embodiment, this disclosure is characterized in that it comprises a sheet layer and an adhesive layer formed on one side of the sheet layer and composed of a nitrile butadiene rubber, a styrene butadiene rubber, a defoamer, a tackifier, and a thickener Sheet.

Preferably, the sheet layer is formed of an air cap or a foam sheet, and is made of one selected from the group consisting of polyethylene, polypropylene, polyurethane and paper.

More preferably, the pressure-sensitive adhesive layer comprises 100 parts by weight of nitrile butadiene rubber, 7 to 45 parts by weight of styrene butadiene rubber, 1.5 to 7.5 parts by weight of a defoaming agent, 15 to 45 parts by weight of a tackifier and 3 to 12 parts by weight of a thickener .

More preferably, the antifoaming agent is at least one selected from the group consisting of minerals, nonionic surfactants and metal soaps.

More preferably, the tackifier is at least one selected from the group consisting of coumarone indene resin, terpene phenol resin, polybutene and hydrogenated rosin ester.

Even more preferably, the thickening agent is composed of a propionic acid-modified acrylic acid ester copolymer and deionized water.

Even more preferably, the adhesive layer further contains 5 to 15 parts by weight of an epoxy resin relative to 100 parts by weight of the nitrile-butadiene rubber contained in the adhesive layer, and the epoxy resin is composed of bisphenol epoxy resin or bisphenol epoxy resin do.

As described above, the self-adhesive packing sheet of the present invention exhibits excellent effects such as heat resistance, acid resistance and electrical insulation, as well as maintaining excellent adhesive strength without deteriorating adhesive strength even after a long period of time or repeated attachment and detachment with adherends.

1 is a sectional view of a self-adhesive sheet of an embodiment of the present invention.
Fig. 2 is a photograph before and after the adhesive strength test of the self-adhesive sheet at 20 占 폚 of Comparative Example 1, where Fig. 2a shows the first day, Fig. 2b shows the seventh day, Fig. It is a photograph afterwards.
Fig. 3 is a photograph before and after the adhesive strength test of the self-adhesive sheet at 20 deg. C in Example 1, in which Fig. 3a shows the lapse of 1 day, Fig. 3b shows the lapse of 7 days, It is the photograph before and after.
4 shows the photographs before and after the adhesion test of the self-adhesive sheet at 70 ° C in Comparative Example 1, in which FIG. 4a shows the adhesion strength test after 1 day, FIG. 4b shows the adhesion strength test after 7 days, It is the photograph before and after.
Fig. 5 shows the photographs before and after the adhesive strength test of the self-adhesive sheet at 70 deg. C in Example 1, in which Fig. 5a shows the lapse of 1 day, Fig. 5b shows the lapse of 7 days, It is the photograph before and after.

Hereinafter, the preferred embodiments of the self-adhesive packing sheet according to the present invention and the physical properties of the respective components will be described in detail, which will be described in detail so as to be easily carried out by a person skilled in the art to which the self- , And this does not mean that the disclosed packaging and self-adhesive sheet has a limited technical scope and category.

The disclosed self-adhesive packing sheet comprises a sheet layer 100 and an adhesive layer 200 formed on one surface of the sheet layer 100 and composed of nitrile butadiene rubber, styrene butadiene rubber, defoamer, tackifier, and thickener.

The sheet layer 100 may be formed of a sheet of a commonly used shape and material, but may be formed of an air cap or foam sheet having a plurality of air caps 121 protruded to be suitable for packaging, It is preferable to be formed so as to securely protect it.

The material of the sheet layer 100 is preferably one selected from the group consisting of polyethylene, polypropylene, polyurethane, and paper, and preferably has a thickness of 4 to 6 millimeters.

1, an air cap film 120 is formed on the lower part of the upper film 110 so as to protrude from the air cap 121. A plurality of air caps 121 are formed on the lower part of the air cap 121, The air cap 121 is formed by the upper film 110, the lower film 130 and the air cap film 120 so that even if a strong impact is applied from the outside, The shock can be effectively buffered to protect the product safely.

The adhesive layer 200 is formed on one surface of the sheet layer 100 to a thickness of 0.01 to 0.1 mm and is composed of nitrile butadiene rubber, styrene butadiene rubber, antifoaming agent, tackifier and thickener. 100 parts by weight of nitrile butadiene rubber 7 to 45 parts by weight of a styrene butadiene rubber, 1.5 to 7.5 parts by weight of a defoaming agent, 15 to 45 parts by weight of a tackifier and 3 to 12 parts by weight of a thickener, and the sheet layer 100 ) To the adherend.

The nitrile-butadiene rubber and the styrene-butadiene rubber serve as main ingredients constituting the adhesive layer 200 to improve physical properties such as impact resistance and elasticity when the adhesive layer 200 is attached to the adherend.

Also, the antifoaming agent contains 1.5 to 7.5 parts by weight of the antifoaming agent and is composed of at least one selected from the group consisting of minerals, nonionic surfactants and metal soaps, Layer 200 as shown in FIG.

If the content of the defoaming agent is less than 1.5 parts by weight, the above effect is insignificant. If the content of the defoaming agent exceeds 7.5 parts by weight, the above-mentioned effect is not greatly improved, and the adhesive performance of the adhesive layer 200 may be deteriorated .

Also, the tackifier is contained in an amount of 15 to 45 parts by weight, and is composed of at least one selected from the group consisting of coumarone indene resin, terpene phenol resin, polybutene and hydrogenated rosin ester. The adhesive layer 200 not only improves the performance but also exhibits the effects of excellent acid resistance and electrical insulation.

The tackifiers listed above have good compatibility with nitrile butadiene rubber and styrene butadiene rubber and maintain their adhesive performance for a long time. The coumarone-indene resins are styrene butadiene rubber, nitrile butadiene rubber, chloroprene rubber, Ethylene propylene diene monomer and the like, and is excellent in performances such as acid-alkali resistance, water resistance and electrical insulation by being non-toxic, so that when a coumarone indene resin is used as a tackifier, And is excellent in acid-alkali resistance, water resistance, electrical insulation, and the like.

The terpene-phenolic resin serves to impart adhesive properties to rubber components such as styrene butadiene rubber, nitrile butadiene rubber, chloroprene rubber and isobutylene-isoprene rubber. The tensile strength of rubber vulcanizate , Elongation percentage and tear strength, and the like.

The polybutene has a role of imparting adhesion to rubber components such as natural rubber, styrene butadiene rubber, and butyl rubber, and improves the workability of the rubber, improves the dispersibility, .

The hydrogenated ester of Resin not only imparts an adhesive property to natural rubber, styrene butadiene rubber, chloroprene rubber, reclaimed rubber and latex, but also has a small skin irritation and suppresses aging of rubber, And serves to form the adhesive layer 200 to be held.

If the content of the tackifier is less than 15 parts by weight, the adhesive property of the adhesive layer 200 deteriorates. When the adhesive property of the adhesive layer 200 exceeds 45 parts by weight, the adhesive strength of the adhesive layer 200 Is excessively increased, and the efficiency of the repeated adhesion and desorption process with the adherend is lowered.

It is preferable that the thickener is comprised of 3 to 12 parts by weight of a propionic acid-modified acrylic acid ester copolymer and deionized water, wherein the propionic acid-modified acrylic acid ester copolymer and deionized water are mixed in a weight ratio of 1: 1, To increase the viscosity of the coating film and to exhibit self-adhesive property.

When the content of the thickener is less than 3 parts by weight, the above-mentioned effect is insignificant. If the content of the thickener exceeds 12 parts by weight, the viscosity of the adhesive layer 200 may be excessively increased and the self-

The adhesive layer 200 may further contain 5 to 15 parts by weight of an epoxy resin relative to 100 parts by weight of the nitrile-butadiene rubber contained in the adhesive layer 200. When the epoxy resin is further contained in the adhesive layer 200, 200 is further improved, the physical properties of the adhesive layer 200 do not deteriorate even under high temperature conditions such as in summer.

When the content of the epoxy resin is less than 5 parts by weight, the heat resistance of the adhesive layer 200 is lowered. When the content of the epoxy resin exceeds 15 parts by weight, the heat resistance of the adhesive layer 200 is not significantly improved, The adhesive performance may be deteriorated.

The epoxy resin preferably contains bisphenol epoxy resin or bisphenol epoxy resin having an epoxy equivalent of 150 to 500 g / eq as an epoxy resin containing a hydrophilic group in the molecule and being dispersed or emulsified in water.

Hereinafter, the physical properties of the self-adhesive self-adhesive sheet for packaging and the self-adhesive self-adhesive sheet prepared through the manufacturing method will be described.

≪ Example 1 >

A polyethylene air-cushion sheet having a thickness of 5 mm was prepared using a polyethylene film, and 100 g of nitrile-butadiene rubber, 25 g of styrene butadiene rubber, 4.5 g of a defoaming agent, 30 g of a tackifier (coumarone indene resin) A pressure-sensitive adhesive layer having a thickness of 0.05 mm was prepared by mixing 8 g of a thickener (mixed with propionic acid-modified acrylic ester copolymer and deionized water in a weight ratio of 1: 1) to prepare a self-adhesive sheet for packaging.

≪ Example 2 >

The procedure of Example 1 was repeated except that a self-adhesive sheet for packaging was prepared using a terpene phenol resin as a tackifier.

≪ Example 3 >

The procedure of Example 1 was repeated, except that polybutene was used as a tackifier to prepare a self-adhesive sheet for packaging.

<Example 4>

The procedure of Example 1 was repeated except that hydrogenated rosin ester was used as a tackifier to prepare a self-adhesive sheet for packaging.

&Lt; Example 5 >

The procedure of Example 1 was followed except that 10 g of bisphenol A epoxy resin having an epoxy equivalent of 350 g / eq was added to 100 g of the nitrile-butadiene rubber contained in the adhesive layer to prepare a self-adhesive sheet for packaging.

&Lt; Comparative Example 1 &

A commercially available product wherein a pressure-sensitive adhesive composition is coated on one side of a polyethylene air-cap sheet.

Two products of Examples 1 to 5 and Comparative Example 1 were prepared to adhere the surfaces coated with the adhesive composition to each other and the adhesive strength at room temperature and the adhesive strength at a high temperature of 70 캜 were measured to be 1 Days, 7 days, and 30 days, respectively, and are summarized in Table 1 below, and the states of the respective products are shown in FIG. 2 to FIG.

<Table 1>

The numerical values of the adhesive strength of each of the examples and comparative examples shown in Table 1 above are obtained by averaging rounded triple test pieces as shown in Figs.

2 and 3 are photographs of the product of Comparative Example 1 (FIG. 2) and the product of Example 1 (FIG. 3) before and after the test at room temperature (20 ° C) (Fig. 4) and the product of Example 1 (Fig. 5) before and after the test at 70 캜.

Fig. 2 shows the photographs before and after the adhesive strength test of the self-adhesive sheet at 20 占 폚 of Comparative Example 1, in which Fig. 2a shows the lapse of 1 day, Fig. 2b shows the lapse of 7 days, It is the photograph before and after. Fig. 3 is a photograph before and after the adhesive strength test of the self-adhesive sheet at room temperature (20 캜) in Example 1, wherein Fig. 3a shows the elapsed time of one day, Fig. 3b shows the elapsed time of 7 days, This is a photograph before and after the adhesive strength test. 4 shows the photographs before and after the adhesion test of the self-adhesive sheet at 70 ° C in Comparative Example 1, in which FIG. 4a shows the adhesion strength test after 1 day, FIG. 4b shows the adhesion strength test after 7 days, It is the photograph before and after. Fig. 5 shows the photographs before and after the adhesive strength test of the self-adhesive sheet at 70 deg. C in Example 1, in which Fig. 5a shows the lapse of one day, Fig. 5b shows the lapse of 7 days, It is the photograph before and after.

Packing material with self-adhesive is used mainly for courier delivery. It usually takes more than 2 days until packing, shipping and unpacking process for domestic courier delivery. In case of overseas delivery, it takes more than 7 days. When such a long-term package is stored, if the adhesive strength of the package is weakened, the package may be broken and the package may be damaged.

However, as can be seen from the test examples in which the examples and the comparative examples are compared as described above, the self-adhesive self-adhesive sheet for packaging disclosed in the above-mentioned example is more time-lengthened at room temperature, and the adhesive strength is further improved.

In particular, it can be seen that the self-adhesive pressure-sensitive adhesive sheet produced through Example 5 exhibits excellent adhesive strength not only at room temperature but also at high temperature.

Thus, the self-adhesive sheet for packaging as described above has excellent adhesive strength, heat resistance, acid resistance and electrical insulation, as well as maintaining excellent adhesive strength without deteriorating adhesive strength even after a long period of time has elapsed or adhesion and detachment with the adherend are repeated .

100: sheet layer
110: Upper film
120: Air cap film
121: Air cap
130: Lower film
140: adhesive layer

Claims (7)

A sheet layer; And
An adhesive layer formed on one side of the sheet layer and made of nitrile butadiene rubber, styrene butadiene rubber, defoaming agent, tackifier and thickener,
Wherein the sheet layer is formed of an air cap and is made of polyethylene or polypropylene,
Wherein the adhesive layer comprises 100 parts by weight of nitrile butadiene rubber, 7 to 45 parts by weight of styrene butadiene rubber, 1.5 to 7.5 parts by weight of a defoamer, 15 to 45 parts by weight of a tackifier and 3 to 12 parts by weight of a thickener,
Wherein the tackifier comprises a coumarone indene resin,
Wherein the adhesive layer further contains 5 to 15 parts by weight of an epoxy resin relative to 100 parts by weight of the nitrile-butadiene rubber contained in the adhesive layer, and the epoxy resin is composed of a bisphenol epoxy resin or a bisphenol- Sheet.
delete delete The method according to claim 1,
Wherein the antifoaming agent is at least one selected from the group consisting of minerals, nonionic surfactants, and metal soaps.
delete The method according to claim 1,
Wherein the thickening agent comprises a propionic acid-modified acrylic acid ester copolymer and deionized water. delete

Images