JPH06128388A - Production of rubber/rubber bonded composite - Google Patents

Abstract

PURPOSE:To provide a rubber/rubber bonded composite by enabling an epichlorohydrin rubber to bond to another rubber advantageous in cost. CONSTITUTION:A rubber material comprising an unvulcanized rubber composition containing an epichlorohydrin rubber is laminated with a rubber material comprising an unvulcanized rubber composition containing an acrylic rubber or an acrylonitrile/butadiene copolymer rubber, and the laminate is subjected to covulcanization.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a rubber / rubber adhesive composite using epichlorohydrin rubber having appropriate oil resistance and heat resistance.

[0002]

2. Description of the Related Art Although epichlorohydrin rubber has appropriate oil resistance and heat resistance as compared with other rubbers, it is expensive, so that it has not been fully utilized by taking advantage of its properties. Therefore, as a means for overcoming the price obstacle and utilizing the excellent physical properties of the above epichlorohydrin rubber, it is considered to use a rubber / rubber adhesive composite compound which is compounded with other relatively inexpensive rubber. To be However, epichlorohydrin rubber has poor affinity with other rubbers,
At present, it cannot be used effectively because it cannot be directly bonded.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for producing a rubber / rubber adhesive composite which allows epichlorohydrin rubber to be adhered to another rubber which is cost effective.

[0004]

DISCLOSURE OF THE INVENTION The present invention which achieves such an object is to provide epichlorohydrin rubber (hereinafter, referred to as CHC).
A rubber material made of an unvulcanized rubber composition containing an acrylic rubber (hereinafter referred to as ACM) or an acrylonitrile-butadiene copolymer rubber (hereinafter referred to as NB)
(Hereinafter referred to as “R”) is laminated on a rubber material made of an unvulcanized rubber composition and co-vulcanized.

As described above, CHC is an ACM or NBR.
The rubber material (hereinafter, referred to as CHC-containing rubber material), which has adhesiveness and is made of an unvulcanized rubber composition containing CHC, is an unvulcanized rubber composition containing ACM. Laminating and co-vulcanizing on a rubber material made of (hereinafter referred to as ACM-containing rubber material) or a rubber material made of an unvulcanized rubber composition containing NBR (hereinafter referred to as NBR-containing rubber material). Thus, the rubber / rubber adhesive composite having oil resistance and heat resistance can be manufactured inexpensively by directly and firmly adhering without using an adhesive or the like.

CHCs used in the present invention include homopolymers of epichlorohydrin excellent in low gas permeability and solvent resistance, and copolymer rubbers with ethylene oxide excellent in low temperature characteristics. As the ACM that can be bonded to the CHC,
There are copolymer rubbers of acrylic acid alkyl ester and 2-chloroethyl vinyl ether and copolymer rubbers of chlorine-free acrylic acid alkyl ester and acrylonitrile. As NBR, a copolymer rubber of acrylonitrile and butadiene, a carboxylated nitrile rubber obtained by copolymerizing a small amount of acrylic acid or methacrylic acid, and a vinylpyridine terpolymer obtained by copolymerizing 2-methyl-5-vinylpyridine. There is rubber etc.

These CHC, ACM and NBR are each used as a rubber composition in which a vulcanizing agent, a reinforcing agent such as carbon black, an antioxidant, a vulcanization accelerator and other various rubber chemicals are mixed. As a vulcanization system for these raw rubbers, CHC is ethylene urea (hereinafter abbreviated as EU) and Pb.
A combination of ₃ O ₄ and ACM is potassium stearate (hereinafter abbreviated as St-K) or sodium stearate (hereinafter abbreviated as St-Na) and sulfur, and NBR is sulfur or acetyl cellulose and sulfur. A combination system of is used.

These rubber compositions are molded into a rubber material having an arbitrary shape such as a sheet shape, a plate shape, a cylinder shape or the like depending on the mode of the rubber / rubber adhesive composite for end use. As these rubber materials, those reinforced by metal cords such as steel cords and cords made of various organic fibers such as nylon, polyester and aramid can be used. When bonding the CHC-containing rubber material to the ACM-containing rubber material or the NBR-containing rubber material, it is important to carry out the adhesion treatment in an unvulcanized state. If these rubber materials are vulcanized, they cannot be firmly bonded.

The co-vulcanization conditions are not particularly limited as long as the CHC-containing rubber material and the ACM-containing rubber material or the NBR-containing rubber material can be vulcanized, but the temperature is preferably 160 to 190. It is preferable to select the time at which the vulcanization can be performed at ° C.

[0010]

【Example】

Examples Three rubber compositions having the composition shown in Table 1 No.
1, 2, and 3 were prepared, respectively. These rubber compositions N
From o.1 to 3, 150mm x 50mm x 0.5 respectively
mm unvulcanized rubber sheet was molded.

Unvulcanized rubber sheets of these three kinds of rubber compositions No. 1 to 3 are combined and directly laminated as shown in Table 2, and both rubber sheets are co-vulcanized under the vulcanization conditions shown in Table 2. Then, rubber / rubber adhesive composites A and B were manufactured. As a result of evaluating the adhesiveness of the obtained rubber / rubber adhesive composites A and B by the following method, the results shown in Table 2 were obtained. Adhesion evaluation method : width from rubber / rubber adhesive composite to 20 m
A sample of m is prepared and a peeling test is performed. When interfacial peeling occurred in this peel test, it was evaluated as poor (x) even if the adhesive strength was high. On the other hand, if the interfacial peeling did not occur, a sheet with a thickness of about 0.5 mm was cut out with a razor centering on the adhesive interface of the adhesive composite, and scratched with a razor near the adhesive interface of this sheet. A peeling test was performed, and a case where any of the sheets was firmly bonded so as to cause cohesive failure inside was evaluated as good adhesiveness (◯).

[0012] In Table 1, the numerical values in the columns of raw rubber and each compounded chemical represent parts by weight.

* 1: GECHRON 3 manufactured by Nippon Zeon Co., Ltd.
102 * 2: Nippon Zeon NIPOL AR 72LS * 3: Nippon Zeon NIPOL 1043 (medium nitrile) * 4: Revital Master Pb ₃ O ₄ * 5: Antiaging agent 445 * 6: Antiaging agent NBC * 7 : N-phenyl-N'-isopropyl-p-phenylenediamine * 8: Nonsar SN-1 * 9: Nonsar TK-1 * 10: Revital Master # 22 (master of ethylenethiourea) * 11: Nt-butyl -2-benzothiazole sulfenamide As can be seen from Table 2, rubber / rubber bonded composites A and B
All had good adhesiveness (◯).

Comparative Example In the examples, the previously vulcanized CHC-containing rubber material was
Unvulcanized ACM-containing rubber material and unvulcanized NB, respectively
The R-containing rubber material was laminated and then vulcanized to produce rubber / rubber adhesive composites A ′ and B ′. As a result of evaluating the adhesiveness of these rubber / rubber adhesive composites A ′ and B ′ by the above method, all of them were poor in adhesiveness (x).

Next, the unvulcanized CHC-containing rubber material is laminated on the previously vulcanized ACM-containing rubber material and NBR-containing rubber material, respectively, and then vulcanized to obtain the rubber / rubber adhesive composites A ″ and B ′. 'Was produced. When the adhesiveness of these rubber / rubber adhesive composites A ″ and B ″ was evaluated by the above-mentioned method, all had poor adhesiveness (x).

[0016]

According to the present invention, ACM or NBR is selected as a rubber to be adhered to CHC, and this CHC-containing rubber material is laminated on the ACM- or NBR-containing rubber material in an unvulcanized state and co-added. Since it can be firmly adhered by vulcanization, it is possible to inexpensively produce a rubber / rubber adhesive composite that effectively utilizes the appropriate oil resistance and heat resistance of CHC.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C08L 71/03 LQF 9167-4J

Claims (1)

[Claims] 1. A rubber material made of an unvulcanized rubber composition containing epichlorohydrin rubber is laminated on a rubber material made of an unvulcanized rubber composition containing acrylic rubber or acrylonitrile-butadiene copolymer rubber. A method for producing a rubber / rubber-bonded composite, which comprises co-vulcanizing with a rubber.