JPS61197877A - Hose - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides weather resistance and vulcanization that eliminates the need for measures to prevent adhesion or pretreatment for vulcanization by arranging a thermoplastic resin outer tube in the outermost layer of the hose. Concerning hoses with excellent wear resistance.

[Prior art]

Conventionally, the following measures have been taken to prevent hoses from coming into close contact with each other due to the softening of the rubber during vulcanization in hoses that have a rubber inner tube, a reinforcing layer, and a rubber outer tube. There are problems, and no effective countermeasures have been developed yet.

First, processing countermeasures include increasing the viscosity of the rubber for the outer tube and applying a mold release agent, but the former causes burns during extrusion and increases energy costs, while the latter causes decreased weather resistance and poor appearance. There is a problem.

In addition, as countermeasures during vulcanization, there are ■measures to prevent adhesion by surface vulcanization treatment using LCM etc., ■vulcanization by lead coating, ■pre-cure treatment by tape wrapping, and ■hot water vulcanization. In the case of (■) above, there is a decrease in physical properties of the rubber, and there is a decrease in weather resistance; in the case of (■), the process is complicated, high cost, and color contamination of colored rubber; in the case of (■), weather resistance is decreased due to the fabric pattern; - There are problems such as poor appearance due to sagging, etc.

[Purpose of the invention]

In view of the above-mentioned conventional problems, it is an object of the present invention to eliminate the need for measures to prevent adhesion or pre-treatment for vulcanization, to employ efficient open steam vulcanization as a vulcanization method, and to improve weather resistance and To provide a hose with excellent wear resistance and good appearance at a cost advantage.

[Structure of the invention]

The hose of the present invention that achieves the above object is constructed by sequentially arranging a reinforcing layer, a rubber outer tube, and a thermoplastic resin outer tube on the outer surface of a rubber inner tube. A desirable configuration is that the outer tube is a thermoplastic resin outer tube with a thermal deformation rate of 10% or less.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in the drawings, the hose of the present invention has a reinforcing layer 2, a rubber outer tube 3, and a thermoplastic resin outer tube 4 arranged in this order on the outer surface of a rubber inner tube 1.

The arrangement of the rubber inner tube 1, the reinforcing layer 2, and the rubber outer tube 3 is the same as that of conventionally known ones, but the hose of the present invention further includes a thermoplastic resin outer tube on the outer surface of the rubber outer tube 3. A major feature is the placement of number 4. In other words, by arranging the thermoplastic resin outer tube 4 on the outermost layer of the hose, it is possible to prevent adhesion and eliminate the need for a mold release agent. Processes such as coating and tape wrapping are not required, and the low heat deformation rate prevents appearance defects such as blurring and contact scratches even when vulcanized using efficient oven steam vulcanization. Furthermore, a hose with excellent weather resistance and abrasion resistance can be obtained.

The thermoplastic outer tube 4 is made of partially cross-linked polyethylene,
Mixture of partially cross-linked nitrile-butadiene rubber and partially cross-linked polyvinyl chloride, mixture of polypropylene and ethylene-propylene terpolymer, nylon 6, nylon 12,
Nylon 11, a mixture of nylon and ethylene/propylene terpolymer, etc., with a thermoplasticity of JIS K 672.
It is preferable to use a material whose heat deformation rate at 150° C. is 10% or less in the heat deformation test described in Section 3.

Next, the present invention will be specifically explained using examples.

Examples As shown in the table below, hoses from ■ to ■ were manufactured by keeping the rubber inner tube, rubber outer tube, and vulcanization conditions the same, but changing the material and heat deformation rate of the thermoplastic resin outer tube. However, as in the conventional method, a thermoplastic resin outer tube was not used, and the rubber outer tube was made thicker to produce the hose shown in (1).

The evaluation results of these hoses are shown in the table below, and the hoses marked ■ to ■, which used thermoplastic resin outer tubes with a heat deformation rate of 10% or less, had perfect external shapes and satisfactory quality. .

(Margins below this page) [Effects of the Invention] As described above, the hose of the present invention has a reinforcing layer, an outer rubber tube, and a thermoplastic resin outer tube arranged in this order on the outer surface of a rubber inner tube. According to the present invention, by arranging the thermoplastic resin outer tube, adhesion can be prevented, so there is no need for a mold release agent, and pre-treatments for vulcanization include surface vulcanization, lead coating, and tape wrapping. This eliminates the need for processes such as
Furthermore, by using a resin outer tube with a low thermal deformation rate, there will be no appearance defects such as sag or contact scratches even when vulcanized as is using efficient open steam vulcanization, and it also has excellent weather resistance and abrasion resistance. It can be used as a hose. Therefore, according to the present invention, a high quality hose can be obtained efficiently at low cost.

[Brief explanation of drawings]

The drawing is a perspective view showing an example of a hose according to the present invention. l... Rubber inner tube, 2... Reinforcement layer, 3... Rubber outer tube, 4... Thermoplastic resin outer tube.

Claims (2)

[Claims] (1) A hose consisting of a reinforcing layer, a rubber outer tube, and a thermoplastic resin outer tube arranged in sequence on the outer surface of a rubber inner tube. (2) The hose according to claim 1, wherein the thermoplastic resin outer tube has a thermal deformation rate of 10% or less.