rubber laminate

Abstract

A rubber laminate, which will contain an aromatic polyamine compound; 1,8-diazabicyclo[5.4.0]undecene-7, 1,5-diazabicyclo[4.3. 0] nonene-5 or their salts; and the unvulcanized carboxyl-containing acrylate rubber layer of the guanidine compound and the unvulcanized polyol crosslinkable fluororubber layer are vulcanized and bonded to form one, wherein, per 100 parts by weight For the unvulcanized carboxyl group-containing acrylate rubber, the guanidine compound is used in a proportion of 3 to 8 parts by weight, preferably 4 to 6 parts by weight. The rubber laminate is excellent in scorch stability and adhesiveness of the unvulcanized acrylate rubber layer.

Description

technical field [0001] The present invention relates to a rubber laminate. More specifically, it relates to a fluororubber / acrylate rubber laminate. Background technique [0002] For a fuel hose (fuelhose), a rubber laminate in which an inner layer is made of a fluororubber and an outer layer is made of an epichlorohydrin rubber is first used (Patent Documents 1 and 2). However, the heat resistance of the rubber laminate is insufficient in a high-temperature environment close to an engine, and a fluororubber / acrylate rubber laminate excellent in heat resistance is required for such an application (Patent Document 3). [0003] In the rubber laminate and hose described in Patent Document 3, although the unvulcanized epoxy group-containing acrylate rubber layer and the unvulcanized fluororubber layer mixed with a silica-based filler are subjected to peroxide co-crosslinking, However, when an epoxy group-containing acrylate rubber was used, a laminate was formed, and a problem...

AI Technical Summary

Problems solved by technology

However, the heat resistance of the rubber laminate is insufficient in a high-temperature environment close to an engine, and a fluororubber / acrylate rubber laminate excellent in heat resistance is required for such an application (Patent Document 3)

[0003] In the rubber laminate and hose described in Patent Document 3, although the unvulcanized epoxy group-containing acrylate rubber layer and the unvulcanized fluororubber layer mixed with a silica-based filler are subjected to peroxide co-crosslinking, However, when using epoxy-containing acrylate rubber, it was found that the heat resistance or compression set resistance was poor.

[0004] Due to the high cost of fluororubber, it is seldom used alone as a hose material, and is often used as a laminated hose with other rubber materials. The above-mentioned patent document 3 is one example, but it has been found that fluororubber and Problems with generally poor vulcanized adhesion to other rubber materials

[0005] It is known to add 1,8-diazabicyclo[5.4.0]undecene-7 salt [DBU salt] or 1,5 -Diazabicyclo[4.3.0]nonene-5 salt [DBN salt] (Patent Document 4), when adding DBU salt or DBN salt to carboxyl group-containing acrylate rubber, it was found that scorch (t5) changed short question

In the case of molded products obtained by extrusion molding such as hoses, if the scorch value is shortened, the problem of burning of the rubber compound during extrusion (生地ヤケ) occurs, and the problem of an increase in the defective rate has been found.

[0006] In addition, Patent Document 5 describes that when vulcanizing an unvulcanized rubber layer mainly composed of fluororubber and an unvulcanized rubber layer not containing fluororubber, at least one of the layers is mixed with hydrochloride of DBU or DBN, Rubber laminates of sulfonate or phenate and oxides, hydroxides or carbonates of Group II to IV metals, as the rubber used in the unvulcanized rubber layer not containing fluororubber, acrylate rubber or The acrylate copolymer obtained by copolymerizing α,β-ethylenically unsaturated carboxylic acid can be used in various hoses, but the same problem as in Patent Document 4 was found in this case as well.

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