KR101355095B1 - Aqueous emulsion pressure sensitive adhesive composition and adhesive film using the same - Google Patents

Abstract

The present invention relates to an aqueous emulsion adhesive material composition and an adhesive film using the same, and more particularly, since the solvent can be replaced with water, the present invention can actively respond to environmental regulations and improve the environment for use, and also aerogels. The present invention relates to an aqueous emulsion adhesive material composition having an excellent thermal insulation property as well as an adhesive having a water-based acrylic adhesive, and an adhesive film using the same. To this end, the aqueous emulsion pressure-sensitive adhesive composition according to the present invention is a monomer mixture, deionized water, surfactants, containing at least one monomer of 2-ethylhexyl acrylate, n-butyl acrylate, methyl methacrylate and acrylic acid monomer Airgel, sodium bicarbonate and ammonium persulfate.

Description

Aqueous emulsion adhesive material composition and adhesive film using same {AQUEOUS EMULSION PRESSURE SENSITIVE ADHESIVE COMPOSITION AND ADHESIVE FILM USING THE SAME}

The present invention relates to an aqueous emulsion adhesive material composition and an adhesive film using the same, and more particularly, since the solvent can be replaced with water, the present invention can actively respond to environmental regulations and improve the environment for use, and also aerogels. The present invention relates to an aqueous emulsion adhesive material composition having an excellent thermal insulation property as well as an adhesive having a water-based acrylic adhesive, and an adhesive film using the same.

Conventionally, adhesives generally used in general are solvent type adhesives prepared by using a volatile organic solvent as a solvent. However, environmental regulations are gradually being strengthened as the industry is advanced, and many environmental problems are caused when volatile organic solvents are used. Therefore, in the pressure-sensitive adhesive field, there is an increasing demand for pressure-sensitive adhesives with less environmentally harmful components.

Recently, an aqueous pressure sensitive adhesive using water as a solvent, which can replace a solvent pressure sensitive adhesive, has been developed. In this prior art, Korean Laid-Open Patent Publication No. 1996-41303 discloses an aqueous pressure-sensitive adhesive composition prepared by adding monomeric or polymer of polyhydric alcohol to an aqueous acrylic emulsion, and Korean Laid-Open Patent Publication No. 1997-42907 discloses a low molecular weight poly An aqueous pressure-sensitive adhesive composition is disclosed in which acrylic acid and the like and high molecular weight polyacrylic acid are blended in a specific weight ratio. Japanese Unexamined Patent Publication No. 2005-146271 discloses an alkyl ester of (meth) acrylic acid, a polymerizable unsaturated carboxylic acid and a monomer copolymerizable with the above. An aqueous emulsion pressure sensitive adhesive comprising an aqueous dispersion of an emulsion polymer and an aqueous emulsion of a tackifying resin and having a limited amount of viscosity, aggregate generation rate and nonvolatile components is disclosed.

In addition, in order to impart additional functionality to the aqueous adhesive, an adhesive material that utilizes various fillers such as fiber, particles, or powder has been developed.

Of these, the filler to be used in this patent is a material called aerogel. In general, aerogels dry the wet gel prepared by the sol-gel reaction without shrinkage under supercritical conditions without a gas-liquid interface to maintain the pore structure of the gel, thereby maintaining high surface area, porosity, and low density. It is a substance. The nomenclature is a compound word for air and solidified liquid gel. Aerogels are called 'air-like solids' or 'frozen smoke'. Because it is 98% filled with gas, it is the lightest solid on the planet, with low thermal conductivity and high usable temperature. And the density was 3 times 0.003g / m ₂ level of the air density (0,001g / m _2). Due to these characteristics, it is showing potential for use in energy storage and saving materials, seawater desalination electrode materials, ultra low dielectric materials, optical and acoustic materials, etc. These types of airgels are based on materials such as organic, inorganic and organic-inorganic composite materials, and are classified into powders, granules, monoliths, and blankets according to the type of products. Currently, most of the airgels based on inorganic materials have been developed and commercialized. The present patent intends to impart various functions of the airgel to the pressure-sensitive adhesive by utilizing the airgel having such various characteristics in the pressure-sensitive adhesive.

Korean Unexamined Patent Publication No. 1996-41303 Korean Unexamined Patent Publication No. 1997-42907 Japanese Patent Publication No. 2005-146271

The present invention has been made to solve the above problems, the object of the present invention can actively respond to environmental regulations, improve the environment and environmentally friendly, and also has the advantages of the water-based acrylic adhesive and heat insulation It is to provide an excellent aqueous emulsion adhesive material composition and an adhesive film using the same.

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

The object is a monomer mixture comprising at least one monomer of 2-ethylhexyl acrylate, n-butyl acrylate, methyl methacrylate and acrylic acid monomer, deionized water, surfactant, airgel, sodium bicarbonate and ammonium persulfate It is achieved by the aqueous emulsion adhesive material composition comprising a.

Here, the content of the airgel is characterized in that 10 to 30% by weight relative to the total weight of the aqueous emulsion adhesive material composition.

Preferably, the content of the airgel is characterized in that 15 to 20% by weight relative to the total weight of the aqueous emulsion adhesive material composition.

Preferably, the airgel is characterized in that the inorganic silica-based powder form.

In addition, the above object is achieved by a pressure-sensitive adhesive film comprising a water-based emulsion pressure-sensitive adhesive material coated on the at least one surface of the base film and the water-based emulsion pressure-sensitive adhesive composition.

According to the present invention, since the solvent can be replaced by water, it can actively respond to environmental regulations, improve the environment for use, and can also improve the use environment, and also have the advantages of having a water-based acrylic adhesive and excellent thermal insulation by including an airgel Has the effect of.

1 is a cross-sectional view of a pressure-sensitive adhesive film is not added to the conventional filler.
2 is a cross-sectional view of the adhesive film according to the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those skilled in the art that these embodiments are provided by way of illustration only for the purpose of more particularly illustrating the present invention and that the scope of the present invention is not limited by these embodiments .

The aqueous emulsion adhesive material composition according to the present invention relates to an aqueous emulsion adhesive material composition having excellent thermal insulation including airgel, and more particularly, to the manufacture of an acrylic aqueous adhesive and its improvement in physical properties. The present invention relates to an aqueous emulsion adhesive material composition having excellent thermal insulation including an airgel whose main purpose is to improve thermal insulation through the use of a filler. In order to manufacture such an aqueous acrylic adhesive, a semi-batch polymerization method was devised and the main polymerization material, 2-EHA (2-Ethylhexyl acrylate) and BA (Butyl acrylate), were mixed to provide the best water-based adhesive material. It is about synthesize | combining. In particular, the addition of an airgel to increase the thermal insulation of the synthetic water-based acrylic adhesive is the core of the present invention.

To this end, the aqueous emulsion pressure-sensitive adhesive composition according to the present invention is a monomer mixture, deionized water, surfactants, containing at least one monomer of 2-ethylhexyl acrylate, n-butyl acrylate, methyl methacrylate and acrylic acid monomer Airgel, sodium bicarbonate and ammonium persulfate.

The airgel may be any organic, inorganic or organic-inorganic composite material, but the present invention is characterized in that the inorganic silica-based.

More preferably, it is a powder type of various product forms of silica airgel.

In addition, the content of the airgel is characterized in that 10 to 30% by weight relative to the total weight of the aqueous emulsion adhesive material composition. Preferably the content of the airgel is 15 to 20% by weight relative to the total weight of the aqueous emulsion adhesive material composition. When the content of the airgel is less than 10% by weight, the effect of the additive is insignificant, and it is difficult to expect the effect.In addition, when the content of the airgel exceeds 30%, the additive effect does not increase quantitatively according to the decrease in the physical properties of the adhesive and the amount of addition. It is not necessary to do this, and it is preferable to set the above range because there is a disadvantage in that economic efficiency is inferior by using an excessive amount of expensive additives.

In addition, one or two kinds of additives may be included to increase compatibility with the airgel and the water-based adhesive material.

In addition, the pressure-sensitive adhesive film according to the present invention is characterized in that it comprises a water-based emulsion pressure-sensitive adhesive material coated with the above-described water-based emulsion pressure-sensitive adhesive composition on at least one surface of the base film.

The base film is not particularly limited, but polyester-based films such as polyethylene terephthalate films, polyethylene films, polypropylene films, and the like may be used.

In addition, the aqueous emulsion adhesive material is preferably coated with a thickness of 50㎛ or more.

Hereinafter, the structure and effect of the present invention will be described in more detail with reference to examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

Example 1

This example is synthesized by the method of emulsion polymerization. First, 75 g of 2-ethylhexyl acrylate (2-EHA, 99.5%), 150 g of n-butyl acrylate (BA, 99.0%), 17,5 g of methyl methacrylate (MMA, 99.0%) to form an acrylic adhesive And 7.5 g of acrylic acid (AA, 99.5%) were used, 172.5 g of deionized water was used as a solvent, 1.25 g of ammonium persulfate (APS, 99.0%) was used as an initiator, and an interface for forming micelles was used. a surfactant sodium dodecyl sulfate (SDS, activity in water; 34.5 ~ 38.5%) 2g and polyoxyethylene alkyl ether sulfate (anionic surfactant with nonionic segment) 3g was used, sodium hydrogen carbonate, in order to control the pH (NaHCO _3, 99.0%) 1.25g to create a water-based emulsion pressure-sensitive adhesive material, coated 100㎛ PI base film with a coating thickness of 100㎛ ± 2㎛ on a primer-treated 100㎛ dried oven for 5 minutes in Example 1 It was.

[Examples 2 to 4]

Next, as shown in Table 1 below, a 100 μm PI of a water-based emulsion adhesive material composition including a component ratio of silica-based airgel powder (used commercially available, not limited to a product of a specific company) was prepared and primed. The coating film was coated with a coating thickness of 100 μm ± 2 μm, followed by drying in a 100 ° C. drying oven for 5 minutes to obtain Examples 2 to 5, respectively. In the following Table 1, "water-based emulsion pressure-sensitive adhesive material" means a configuration except "aerogel" in "water-based emulsion pressure-sensitive adhesive composition" and "%" represents "weight%".

Example 2 Example 3 Example 4 Example 5 Water-based emulsion adhesive material (%) 95 90 85 80 Airgel (%) 5 10 15 20

Using the water-based emulsion pressure-sensitive adhesive material according to Examples 1 to 5 to measure the physical properties through the following experimental example and the results are shown in Tables 2 and 3.

[Experimental Example]

1. Probe tack

Initial adhesion was measured at room temperature using a Texture Analyzer (Stable Micro Systems, TA-XT2i). The probe used was a polished stainless steel cylinder probe with a probe diameter of 5 mm. The initial adhesive force is measured by measuring the force when the probe approaches the surface of the adhesive at a rate of 0.5 mm / sec, stays at a force of 100 gf / cm ² for 1 second, and then falls at a rate of 10 mm / s. Used.

2. Peel strength (180 °) peel strength )

The pressure-sensitive adhesive film used to measure the peel strength was prepared in a width of 2.5 cm. The pressure-sensitive adhesive film was pasted on a stainless steel surface, and then bonded back and forth twice with a rubber roller of 2 kg. Peel strength was measured at a rate of 300 mm / min at room temperature using a Texture Analyzer (Stable Micro Systems, TA-XT2i). Peel strength was used as the average of the measured values.

3. Insulation

The temperature was measured by an infrared thermometer after 1 minute after placing the adhesive layer on the hot film at 80 ℃ to face the adhesive layer. Temperature measurements were taken five times for each sample and then averaged.

Table 2 below shows the results of initial adhesion and peel strength according to the amount of airgel added to the aqueous emulsion adhesive material.

Example 1 Example 2 Example 3 Example 4 Example 5 Probe Tack (gf) 218 220 219 220 223 Peel Strength (gf) 399 395 388 385 390

As can be seen in Table 2, even if the airgel is used within the range of the addition amount of the airgel constituting the water-based emulsion pressure-sensitive adhesive material according to the present invention, it can be seen that the initial adhesion of the water-based emulsion pressure-sensitive adhesive material does not significantly affect, It can be seen that even within the range of addition amount of the airgel constituting the present invention, the use of the airgel does not significantly affect the peel strength of the aqueous emulsion adhesive material.

Next, Table 3 below shows the results of confirming the thermal insulation according to the amount of airgel added to the aqueous emulsion adhesive material.

Example 1 Example 2 Example 3 Example 4 Example 5 Insulation Measurement 1
(℃) 79 80 77 65 60

As can be seen in Table 3, as a result of confirming the degree of heat transfer, it can be confirmed that the thermal insulation performance of the pressure-sensitive adhesive material to which the airgel is added is relatively higher than that of the case where the airgel is not added. That is, Table 3 is an evaluation result of relatively measuring the thermal insulation by how much heat of the hot plate is transferred to the adhesive film due to the heat insulation based on the temperature of the hot plate 80 ℃, Examples 1 to 3 Although the temperature is similar to the plate, it can be seen that the thermal insulation is hardly performed. However, in Examples 4 to 5, the temperature is up to 20 ° C. lower than that of the hot plate. By confirming that the transfer of temperature is less, it can be judged that it is relatively insensitive to heat transfer, thereby indicating the thermal insulation performance. Therefore, it can be seen that the aqueous emulsion adhesive material composition according to the present invention most preferably comprises 15 to 20% by weight of the airgel relative to the total weight of the aqueous emulsion adhesive material composition.

It is to be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

1: Base film 2: Water-based emulsion adhesive material
3: airgel particles

Claims (5)

In the water-based emulsion adhesive material composition,
Monomer mixture comprising at least one monomer of 2-ethylhexyl acrylate, n-butyl acrylate, methyl methacrylate and acrylic acid monomer, deionized water, sodium dodecyl sulfate as surfactant and polyoxyethylene alkyl ether sulfate, airgel Including sodium hydrogen carbonate and ammonium persulfate, the content of the airgel is characterized in that the water-based emulsion adhesive material composition, characterized in that 15 to 20% by weight relative to the total weight of the aqueous emulsion adhesive material composition. delete delete The method of claim 1,
The airgel is a silica-based airgel, characterized in that the powder form, water-based emulsion adhesive material composition. As an adhesive film,
Base film,
The adhesive film, characterized in that it comprises at least one surface of the aqueous emulsion pressure-sensitive adhesive material coated with a water-based emulsion pressure-sensitive adhesive composition according to claim 1 on at least one side of the base film.

Images