Method for producing hose with protector layer

Abstract

The purpose of the present invention is to provide a method for producing a hose with a protector layer that has excellent storage stability and increased vulcanization rate. A method for producing a hose with a protector layer, said hose having a protector layer (2) that is formed on the outer circumference of a tubular polyamide resin layer (1), which comprises: a step wherein a first rubber material that contains the components (A)-(C) described below and a second rubber material that contains the components (a) and (b) described below but does not substantially contain a sulfur vulcanizing agent are separately prepared, and a rubber composition for forming a protector layer is obtained by mixing these rubber materials in a mixing device; and a step wherein the protector layer (2) is formed by continuously extrusion-molding the rubber composition on the outer circumference of the polyamide resin layer (1), which has been formed in advance, and then continuously vulcanizing the unvulcanized rubber. (A) an ethylene-propylene rubber (B) a sulfur vulcanizing agent (C) a thiuram vulcanization accelerator having a melting point of 66-105 DEG C (a) an ethylene-propylene rubber (b) a vulcanization accelerator having a melting point of 120 DEG C or higher.

Description

technical field [0001] The present invention relates to a method for producing a hose with a protective layer in which a protective layer is formed on the outer periphery of a tubular polyamide-based resin layer. Continuous process for the protection of hoses. Background technique [0002] Generally, a fuel hose is configured by covering the outer periphery of a resin layer made of fluororesin or polyamide resin with a protective layer made of a rubber composition. The reason why the protective layer is formed in this way is to prevent a fire or the like from occurring when the resin layer of the fuel hose is damaged during a vehicle collision and fuel leaks out. Conventionally, in such a protective layer of a fuel hose, a highly active vulcanization accelerator such as a thiuram system has been used in order to accelerate vulcanization (shorten vulcanization time) (for example, refer to Patent Document 1). [0003] prior art literature [0004] patent documents [0005]...

AI Technical Summary

Problems solved by technology

[0007] However, if the above-mentioned highly active vulcanization accelerator is used, although rapid vulcanization can be achieved, the reverse side will easily scorch (complete vulcanization phenomenon), and the vulcanization reaction will proceed completely even if it is left at room temperature, so storage very poor stability

Images