JPS61277A - Adhesive composition - Google Patents

Abstract

PURPOSE:To obtain an adhesive exhibiting good adhesion to non-polar high- molecular materials, consisting of a specified satd. hydrocarbon polymer and a chlorinated polypropylene. CONSTITUTION:An adhesive compsn. consists of a hydrocarbon polymer which contains at least one hydroxyl group at its terminal and whose main chain is wholly or partially satd. and a chlorinated polypropylene. The compsn, is suitable for use as an adhesive which can bond a non-polar, high-molecular material or other material to a non-polar, high-molecular material such as instrument panel, stone guard or center pillar. The compsn. can also be used as an adhesive for primers for paints or other materials and as a primer for other adhesives for non-polar, high-molecular materials.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an adhesive composition mainly suitable for adhering non-polar polymeric materials.

(Prior art 9 Generally polypropylene (PP), polyethylene (PE)
, ethylene-propylene nonconjugated diene terpolymer (E
PDM), ethylene-propylene copolymer (EPR
) and other non-polar polymer materials, such as those contained in acrylonitrile-butadiene-styrene terpolymer (ABS) and nitrile butadiene rubber (NBR), have a polar group in the molecule I
I can't carry it on my own.

Therefore, even if paint is applied to these non-polar polymer materials, the coating film easily peels off, making it extremely difficult to paint non-polar polymer materials. Furthermore, similar difficulties arise when adhering these nonpolar polymeric materials to each other, or when adhering a nonpolar polymeric material to a metal, resin, or other metal material.

As a countermeasure to this problem, many treatments have already been attempted on nonpolar polymer materials. For example, ■ polishing the surface with a wire brush or sandpaper, ■ irradiating the surface with ultraviolet rays, ■
Methods include immersion in concentrated sulfuric acid, and treatment with a mixed solution of organic monocarboxylic acid and phosphoric acid.

(Problems to be Solved by the Invention) Therefore, the present invention attempts to solve the problem that sufficient adhesive strength cannot be obtained for non-polar polymer materials such as PP, PE, EPDM, and EPR. be.

Structure of the Invention (Means for Solving the Problems) In order to solve all of the above-mentioned problems, the present invention provides a hydrocarbon polymer whose main chain is saturated or partially saturated and has at least one hydroxyl group at the end. and chlorinated polypropylene.

(Function) The above adhesive composition exhibits high adhesive strength to nonpolar polymeric materials.

Example In this example, chlorinated polypropylene (hereinafter CL) dissolved in low molecular weight polyolefin polyol and toluene was used.
- PP) was mixed to form an entire composition.

Low-molecular-weight polyolefin polyols (hereinafter referred to as Hcp) are hydrocarbon-based polymers whose main chain is saturated or partially saturated and has at least one hydroxyl group at the end. Same H
As the CP, for example, Polytail H, Polytail HA, etc. manufactured by Mitsubishi Chemical Industries, Ltd. (Polytail is a registered trademark of the same company) can be used. At room temperature, it is a wax-like solid or liquid. Materials that are solid at room temperature soften when heated, and become liquid when heated above their melting point (hereinafter referred to as mp). (Details are given in Magazine Industrial Materials, Vol. 29, No. 12 and Vol. 30, No. 1, published by Nikkan Kogyo Shimbun.) Therefore, various modifications can be carried out using the hydroxyl double bond and the like. It also exhibits good mechanical properties, electrical insulation, chemical resistance, water resistance, weather resistance, ozone resistance, thermal stability, and adhesion.

Therefore, this invention utilizes the above properties,
This adhesive composition is a mixture of CL-PP and saturated or partially saturated HCP in the main chain having at least one hydroxyl group at the end.

Hereinafter, for this example, preparation of the sample, measurement results of peel strength, and application will be explained in order.

[Preparation of Single-Ply Adhesive Composition Sample] In order to confirm the effect of the adhesive composition of this example, each material was blended in Examples 1 to 2 at the polymerization ratio shown in Table 1. The degree of chlorination of CL-PP is also listed in the same table.

For further comparison, Bond G2 (CR adhesive) was used as Comparative Example (2), and Bond G103 (NBR adhesive) was used as Comparative Example (2).

The adhesives used in Comparative Examples (1) and (2) above are trade names manufactured by Konishi Co., Ltd.

[2] Measurement of peel strength The adhesive strength of the adhesive composition of this example to a non-polar polymeric material was measured by a peel test. The same peel test was conducted using a polyethylene resin (2mm) with a 20x foaming thickness of 2mm.
Each adhesive was applied between the PE foam (hereinafter referred to as PE foam) and cured at room temperature. However, for Examples (■) and (■), after applying the same adhesive as a primer to the adhesive surface of the PE foam, a urethane prepolymer having terminal isocyanate groups was applied between them, and after curing at room temperature, peeling was performed in the same manner as above. I conducted a test.

The results are shown in Table 2 as peel strength (value when PE foam breaks).

As is clear from Table 2, the adhesive strength of each Example was significantly higher than that of Comparative Examples (1) and (2), and the bond between the bonded surfaces was strong, so that all of the fractures progressed within the PE foam.

Furthermore, since HCP has excellent heat resistance as described in 1) 1J, the heat resistance of the adhesive composition of this example containing HCP was also improved.

[3] Application This example is for attaching a valve-opening polar polymer material or other material to a non-polar polymer material such as an instrument panel, stone guard, ± ivy, etc.; it can be used as an adhesive agent. .

As an example of this, a concrete example of attaching a bright molding 44 to a side protector made of a non-polar polymer material (hereinafter simply referred to as a cyto mold) attached to the side surface of an automobile body will be described with reference to the drawings.

Weight parts: 77 parts of PP, 15 parts of PE, EPRIl
The side molding l made of a non-polar polymeric material made of 8 parts is formed as a long body with a dogleg shape in cross section, and has a hooking part 1a on the back side of the approximately central part.
are integrally formed. A locking hole 2 is provided in front of the locking portion 1a. Furthermore, an outer protrusion 3 is integrally formed at the upper end of the side molding 1, and an inner protrusion 4 is integrally formed at the lower end. The side molding 1 is fastened and fixed to the automobile body 6 by screws 5 that are engaged with the latching portions 1a.

Also, on the outside of the upper end of the side molding 16, a decorative bright molding 7 is formed by co-extruding the part 11 with double-sided adhesive tape 8 and adhesive 9 applied to the surface of the side molding 1. has been done.

The double-sided adhesive tape 8 is composed of a sponge 12 made of acrylic and formed into a thin plate shape, and an acrylic adhesive 13 coated on both sides of the sponge 12. The acrylic adhesive 13 does not have high adhesiveness when carved into the non-polar polymer material of the side molding 1. Therefore, the adhesive 9 is interposed between the acrylic adhesive 13 and the side molding 1.

The adhesive composition of this example can be used as the adhesive 9,
As is clear from the test results listed below, high adhesive strength can be obtained.

Furthermore, in order to speed up the drying of the adhesive 9, heat may be applied. In this case, with conventional adhesives, there was a possibility that the adhesive would deteriorate at temperatures above 100°C. However, since the adhesive of this example has excellent heat resistance as described above, it does not deteriorate easily at about 100°C. However, it is necessary to consider the heat resistance of the molding.

Note that the present invention is not limited to the configuration of the embodiment described above, and can be embodied as follows, for example. (1) The present invention is not limited to use as an adhesive for non-polar polymer materials, but can also be used, for example, as a primer for paint or as an adhesive for other materials. (2) It is also possible to use the adhesive composition of the present invention as a primer for another adhesive for non-polar polymeric materials.

Effects As detailed above, this invention is an excellent invention as an adhesive composition that can significantly increase adhesive strength to nonpolar polymeric materials.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the present invention applied to attaching a bright molding to a side molding made of a non-polar polymer material, and Fig. 2 is an enlarged view of the attached part. 1 side molding, 7 bright molding, 8 double-sided adhesive tape, 9
glue.

Claims (1)

[Scope of Claims] 1. An adhesive composition comprising a saturated or partially saturated hydrocarbon polymer in the main chain having at least one hydroxyl group at the end and chlorinated polypropylene. 2. The adhesive composition according to claim 1, wherein the chlorinated polypropylene is dissolved in a solvent such as benzene, toluene, or xylene.