JP2000282001A - Adhesive composition for adhesion of polyolefin-based foam resin sheet and application of adhesion using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aqueous adhesive composition having strong cohesive force, excellent water resistance, having tackiness at a low temperature without swelling or peel off of a sheet in summer in an adhesion of a thermoplastic polyolefin-based resin sheet having a heat insulation material with a substrate. SOLUTION: This adhesive composition is composed of acid-containing chloroprene, a polybutene emulsion, a tackifier and a metal oxide, and a preferable mixing ratio is 100 pts.wt. of acid-containing chloroprene, 5-50 pts.wt. of a polybutene emulsion, 20-80 pts.wt. of a tackifier and 0.5-5.0 pts.wt. of a metal oxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin foamed resin sheet, and more particularly to a thermoplastic polyolefin resin sheet with a heat insulating material obtained by fusing and laminating a heat insulating material made of a polyolefin foamed resin sheet to a thermoplastic polyolefin resin sheet. The present invention relates to an adhesive composition to be used by being applied to a base when the heat insulating material side is used as a base, and to a bonding method.

[0002]

2. Description of the Related Art Conventionally, a chloroprene-based solvent type has been widely used as an adhesive for bonding a thermoplastic polyolefin-based resin sheet with a heat insulating material to a substrate because of its adhesive function and reliability. The exhaust from the site at or near the site of the laying operator has a considerable adverse effect on the environment.Therefore, it has recently been necessary to remove the solvent and eliminate the use of solvents. The movement to move to has emerged.

[0003] Water-based adhesives are disclosed in
No. 20,877, Japanese Patent Application Laid-Open No. 3-655785, and Japanese Utility Model Application Laid-Open No. 51-14846 are already known. In particular, Japanese Patent No. 2721851 discloses a method in which a water-based primer and a water-based adhesive are sequentially applied to a base. It describes a method of laying a sheet on which an organic solvent-based glue is adhered in advance, and the aqueous adhesive is made of various synthetic resin emulsions or chloroprene rubber latex as a main raw material. . However, water-based adhesives have the disadvantages of higher cost and lower water resistance than solvent-based adhesives, and solvent-based adhesives can be applied on both sides because of their quick drying properties. However, there is a problem that a one-sided application method is required only for the base without applying to the surface of the heat-insulating material that does not penetrate.

[0004]

However, thermoplastic polyolefin-based resin sheets with a heat insulating material are hard at low temperatures (5 ° C.) and have high repulsion at low temperatures. For this reason, single-sided adhesion requires initial tackiness, but tackiness and repulsion are actions that are opposite to each other and are difficult to coexist.

[0005] The present invention addresses the above-mentioned situation and finds a novel composition of the adhesive, thereby exhibiting both the initial tackiness and the cohesive force and exerts an excellent effect on the adhesion between the heat insulating material and the substrate. An object of the present invention is to provide an adhesive composition for a thermoplastic polyolefin resin sheet with a heat insulating material.

[0006]

That is, a feature of the adhesive composition of the present invention which meets the above-mentioned object is a composition comprising an acid-containing chloroprene latex, a polybutene emulsion, a tackifier and a metal oxide.

More specifically, 5 to 50 parts by weight of a polybutene emulsion, 20 to 80 parts by weight of a tackifier, and 0.1 to 100 parts by weight of an acid-containing chloroprene are used.
It is a composition consisting of 5 to 5.0 parts by weight.

The present invention also relates to a method for bonding a thermoplastic polyolefin resin sheet with a heat insulating material using the above-mentioned adhesive, wherein a heat insulating material comprising a polyolefin foam resin sheet is fused and laminated on the thermoplastic polyolefin resin sheet. Thermoplastic with a material is characterized in that the above-mentioned adhesive is applied to a base and adhered to the base sheet of the polyolefin resin sheet with the foamed resin sheet side as the base.

At the time of this bonding, it is also effective to apply a rubber paste obtained by dissolving chloroprene rubber in a solvent to a heat insulating material made of a foamed resin sheet and to dry it beforehand, in order to obtain a sufficient bonding effect. This is a feature of the present invention.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail.

As described above, the present invention relates to an adhesive composition for a thermoplastic polyolefin resin sheet with a heat insulating material, particularly for a heat insulating material, comprising an acid-containing chloroprene, a polybutene emulsion, a tackifier, and a metal oxide. A composition comprising: Here, chloroprene rubber containing carboxylic acid is generally used as the acid-containing chloroprene, and the polybutene emulsion has a molecular weight of 1,000 to 3,000,
Examples of the tackifier include a phenol resin, a petroleum resin, a rosin ester resin, and the like.

The acid-containing chloroprene rubber and the tackifier are actually mixed in a form dispersed in water, that is, in the form of a chloroprene rubber latex and a resin emulsion, respectively. At this time, the tackifier imparts initial adhesive strength to the adhesive, and fixes the sheet to the base until the adhesive aggregates and develops the original adhesive strength.

The tackifier composed of a resin emulsion is usually used in an amount of 20 parts by weight per 100 parts by weight of the acid-containing chloroprene.
The amount is from 80 to 80 parts by weight, preferably from 25 to 50 parts by weight. If the amount is less than 80 parts by weight, the adhesiveness is inferior. The metal oxide used in the present invention is zinc oxide, lead oxide, or the like, and is used in an amount of 0.5 to 5.0 parts by weight with respect to the acid-containing chloroprene rubber. Most preferred.

[0014] In the above composition, the metal oxide cross-links with the acid-containing chloroprene rubber when the water content evaporates after application of the adhesive to give cohesive strength and water resistance. Agglomeration cannot be obtained, strength after crosslinking cannot be exhibited, adhesive strength is reduced, swelling or peeling occurs, and water resistance is deteriorated.

On the other hand, if the content exceeds 5.0 parts by weight, the tackiness becomes poor and poor adhesion is caused. Therefore, it is preferable to add and mix in the range of 0.5 to 5.0 parts by weight.

Further, in the present invention, the polybutene used in the above composition has an important role in imparting tackiness at low temperatures. This polybutene is acid-containing chloroprene 1
5 to 50 parts by weight, preferably 15 to 3 parts by weight, per 100 parts by weight
It is desirable to use 0 parts by weight.

Although the adhesive composition of the present invention is composed of the above-mentioned components, it does not prevent the addition of a softening agent, an inorganic filler, aqueous ammonia and the like as needed.

The softener is a plasticizer such as DOP, DBP, paraffinic oil, naphthenic oil, high boiling point solvent, etc., and is usually added in an amount of 0 to 25 parts by weight based on the acid-containing chloroprene. This improves workability such as applicability, and may be omitted particularly at high temperatures such as in summer.

Calcium carbonate, clay, talc and the like can be used as the inorganic filler.
0 to 30 parts by weight is appropriately blended with respect to parts by weight to increase the amount. However, blending is not necessarily required. The ammonia water is used as needed for pH adjustment.

As described above, the adhesive comprising the composition of the present invention formed by the above-mentioned compounding, as described above, causes the metal oxide to crosslink the chloroprene rubber in the above-mentioned compounding, thereby strengthening the adhesive force and further after the adhesive application. In addition, when the water content evaporates, the acid-containing thickener is cross-linked by the metal oxide to prevent the deterioration of water resistance. In addition, the use of polybutene enhances the adhesiveness at a low temperature, making the use in winter effective.

Next, a thermoplastic polyolefin-based resin sheet with a heat insulating material, which is fusion-bonded with a thermoplastic polyolefin-based foamed resin sheet using the polyolefin-based foamed resin sheet as a heat insulating material using the above-mentioned adhesive, may be used as a base. According to the present invention, in this case, first, a solution in which general chloroprene is dissolved in advance is pasted to a heat insulating material, and the adhesive of the present invention is applied to and adhered to a base using the heat insulating material as a base. Note that the heat insulating material is a polyolefin-based foamed resin sheet such as polyethylene, polypropylene, and ethylene vinyl acetate, and the purpose of the present invention is not to use another foamed resin sheet. Further, among the polyolefin-based foamed resin sheets, it is preferable to use a foamed sheet made of polyethylene because it is excellent in flexibility and easily conforms to the base and excellent in workability. When a heat insulating material made of a polyolefin-based foamed resin sheet is bonded to a substrate through the above-mentioned adhesive, it has both initial tackiness and cohesive strength, and can exhibit good adhesive strength.

Hereinafter, the results of confirming the effects of the present invention by examples will be described.

[0023]

Examples Basic blends of acid-containing chloroprene rubber latex (manufactured by Tosoh Corporation, Skyprene latex), polybutene emulsion (Nissan polybutene emulsion, manufactured by NOF Corporation), metal oxide (zinc oxide dispersion), rosin ester (Arakawa) The adhesives of Examples 1 to 4 were obtained by using a chemical compound (Superester Emulsion, manufactured by Kagaku Co., Ltd.) and the blending ratio was changed, and these adhesives were applied to a base mortar using a brush at 200 g / m ₂ .

On the other hand, an adhesive of each composition different from the above-mentioned basic composition was prepared and used as Comparative Examples 1 to 3.
Similarly, 200 g / m _{2 was} applied to a base mortar using a brush using a conventional solvent-based adhesive (Comparative Example 4) shown in FIG. Then, after drying at room temperature of 20 ° C. for 1 hour, a thermoplastic polyolefin resin sheet with a heat insulating material, in which a chloroprene solution is pasted to a heat insulating material made of a polyolefin foam resin sheet, with the heat insulating material side as a base side Each was bonded and pressure-bonded using a hand roll, and the obtained bonded product was subjected to a 180 ° peeling test at a peeling speed of 200 m / min with a tensile tester after 24 hours at room temperature. Table 2 shows the results. In the table, ○ indicates good, x indicates poor, and △ indicates intermediate. In addition, the respective states of the normal temperature adhesive force and the 40 ° C hot water adhesive force were Examples 1 to 4 in a peeled state, Comparative Example 4 in a heat insulating material destruction state, and Comparative Examples 1 to 3 in an interface destruction state.

[0025]

[Table 1]

[Table 2]

From the above results, it can be seen that the use of the adhesive composition of the present invention makes it possible to apply a single-sided adhesive to a solvent-based adhesive having the same tackiness and fixability as those of a solvent-based adhesive.
It turns out that adhesiveness can be exhibited.

Next, comparative adhesives were prepared based on the respective compositions shown in the following table for acrylic adhesives (Table 3), which are conventional water-based adhesives, and a peeling test was also performed on these adhesives. The results are shown in Table 3 below.

[0028]

[Table 3]

Comparing the above results with the above-mentioned embodiment of the present invention, it is understood that the present invention has a remarkable difference in the adhesiveness between room temperature and hot water as well as the adhesiveness and fixability.

[0030]

As described above, the present invention relates to a water-based adhesive comprising, as a main component, an acid-containing chloroprene and a polybutene emulsion, to which a tackifier and a metal oxide are added. As an agent, the organic solvent does not vaporize and fill the air at the site, does not adversely affect humans, animals and plants, and can improve the safety of workers and the purification of the surrounding environment. The chloroprene rubber and the metal oxide are cross-linked by adding the contained chloroprene and the metal oxide, generating a cohesive force, maintaining a strong adhesive force even in summer, and preventing the occurrence of swelling and peeling of the sheet. By adding polybutene emulsion to impart low temperature tackiness,
As a whole, it has a remarkable effect of exhibiting adhesiveness, fixability, and adhesiveness cooperating with the adhesion between the heat insulating material and the base in bonding the thermoplastic polyolefin resin sheet with the heat insulating material to the base.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Kamoto 4-1-1-21 Hamazoedori, Nagata-ku, Kobe Mitsusei Belt Co., Ltd. F term (reference) in the Chemical Industry Co., Ltd. Nakatsu Factory 4J040 BA202 CA141 DA132 DN032 EB052 GA07 HA126 HA136 JA03 JB11 KA16 KA26 LA01 LA06 LA07 LA11 MA11 MB03 PA09

Claims (5)

[Claims] 1. An adhesive used for bonding a polyolefin foamed resin sheet to a substrate, comprising: an acid-containing chloroprene latex, a polybutene emulsion, a tackifier, and a metal oxide. An adhesive composition for bonding a sheet. 2. A composition comprising 5 to 50 parts by weight of a polybutene emulsion, 0.5 to 5.0 parts by weight of a metal oxide, and 20 to 80 parts by weight of a tackifier based on 100 parts by weight of chloroprene containing acid. The adhesive composition for bonding a polyolefin-based foamed resin sheet according to claim 1. 3. A polybutene emulsion having a molecular weight of 100.
The adhesive composition for bonding a polyolefin-based foamed resin sheet according to claim 1 or 2, which has a molecular weight of 0 to 3000. 4. A thermoplastic polyolefin-based resin sheet provided with a heat-insulating material obtained by fusing and laminating a heat-insulating material made of a polyolefin-based foamed resin sheet on a thermoplastic polyolefin-based resin sheet, wherein the foamed resin sheet side is a base side. Item 7. An adhesive construction method, wherein the adhesive composition according to Item 1, 2 or 3 is applied to a substrate and adhered. 5. A rubber paste in which a chloroprene rubber is previously dissolved in a solvent in the above-mentioned heat insulating material of a thermoplastic polyolefin resin sheet with a heat insulating material obtained by fusing and laminating a heat insulating material made of a polyolefin foam resin sheet on a thermoplastic polyolefin resin sheet. The bonding method according to claim 4, wherein the adhesive is applied.