JPH0820027B2 - hose - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hose, and more particularly to a hose having an inner layer made of synthetic rubber and an outer layer made of soft vinyl chloride resin or the like.

[Prior Art] Conventionally, in an oil resistant hose or a gas hose, the inner layer is made of synthetic rubber in terms of durability, and the outer layer is made of soft vinyl chloride resin or the like in terms of decorativeness and the like.

Conventionally, the synthetic rubber of the inner layer and the soft vinyl chloride resin of the outer layer have been adhered with a urethane adhesive or the like, but sufficient adhesive force has not been obtained.

On the other hand, in order to improve the adhesive force, the surface of the synthetic rubber surface of the inner layer is surface-treated with a halogen compound such as a halogen gas, a hypohalous acid solution, or a coagulated halogen compound, and then adhered by using an adhesive such as urethane. It has been known.

[Problems to be Solved by the Invention] However, in the method of performing the above surface treatment, since halogen gas, a halogen compound or the like is used as a rubber surface treatment agent, the manufacturing process is complicated and the surface treatment is not performed. Since the agent has the corrosiveness of metal, it has the drawback of corroding the manufacturing equipment.

[Means for Solving the Problems] The present invention solves the above-mentioned conventional problems and provides an intermediate layer capable of bonding an inner layer made of synthetic rubber and an outer layer made of soft vinyl chloride resin or the like with high adhesive strength. A hose is provided.

The hose of the present invention is a hose having an inner layer made of synthetic rubber and an outer layer made of a soft vinyl chloride resin, a vinyl chloride thermoplastic elastomer, or a thermoplastic urethane, wherein a polar rubber is provided between the inner layer and the outer layer. And polar rubber 10
An intermediate layer containing 10 to 100 parts by weight of fine particle silicic acid and 10 to 200 parts by weight of fine particle silicate compound as a white filler with respect to 0 parts by weight so that the total is at least 30 parts by weight, the inner layer and the intermediate layer are provided. Are vulcanized and bonded, and the outer layer and the intermediate layer are bonded with an adhesive.

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

1 and 2 are views showing an embodiment of the hose of the present invention, wherein FIG. 1 is a sectional view taken along line I-I of FIG.
FIG. 2 is a structural explanatory view.

In the present invention, the synthetic rubber forming the inner layer 2 of the hose 1 is not particularly limited, but includes nitrile-butadiene rubber (NBR), chloroprene rubber (CR), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CPE), Acrylic rubber (ACM), epichlorohydrin rubber (CO, EC
A polar rubber such as O) is preferably used. It should be noted that any of these polar rubbers may be blended with a nonpolar rubber such as styrene-butadiene rubber (SBR) or natural rubber in an amount of 70 parts by weight or less of the nonpolar rubber based on 100 parts by weight of the polar rubber.

On the other hand, the outer layer 3 is made of a soft vinyl chloride resin, a vinyl chloride thermoplastic elastomer, or a thermoplastic urethane.

The mid layer 4 is made of polar rubber containing a white filler. As the polar rubber used for the mid layer 4, a polar rubber of the same kind as the synthetic rubber composing the inner layer 2 or a polar rubber containing a non-polar rubber is used. Among them, the acrylonitrile content is 15% by weight or more, preferably 30% by weight. NBR or C above
R, or a mixture thereof, is preferably used.

When blending polar rubber with white filler, polar rubber 100
10 to 100 parts by weight of fine particle silicic acid and 10 to 200 parts by weight of fine particle silicate compound are added in an amount of at least 30 parts by weight, preferably 50 to 100 parts by weight, based on parts by weight.
If the amounts of the fine particle silicic acid and the fine particle silicate compound are out of the above ranges, sufficient adhesive force cannot be obtained.

As the fine particle silicic acid, dry method silicic acid or wet method silicic acid is used. Further, as the fine particle silicate compound,
Synthetic silicate compounds such as magnesium silicate, aluminum silicate, calcium silicate, etc. or naturally occurring silicate compounds such as clay, nepheline, syenite, calcined clay, talc, ultrafine magnesium silicate, diatomaceous earth, silica sand,
Slate powder, mica powder, asbestos, etc. are used.

The rubber constituting the intermediate layer 4 includes a vulcanizing agent, a vulcanization accelerator, another filler such as carbon black, an antioxidant,
Additives generally used in rubber products such as plasticizers and oils can be added.

As the adhesive 5 for adhering the intermediate layer 4 and the outer layer 3, a polyurethane resin type, an acrylic resin type, vinyl chloride
Adhesives such as acrylic resin type, vinyl acetate-vinyl chloride resin type, ethylene-vinyl acetate resin type, polyester resin type, chloroprene rubber type, nitri rubber type and urethane type adhesives are used.

As shown in FIGS. 3 and 4, the hose of the present invention has a mesh or the like between the inner layer 2 and the intermediate layer 4 (FIG. 3) or between the intermediate layer 4 and the outer layer 3 (FIG. 4). By providing the reinforcing layer 6, the pressure resistance performance of the hose and the like can be improved.

In such a hose of the present invention, an inner layer is formed of unvulcanized rubber, and if necessary, the unvulcanized rubber for the intermediate layer is covered with a reinforcing mesh or the like, and then vulcanized integrally. It can be easily manufactured by applying an adhesive on the surface and, if necessary, covering it with an outer layer through a reinforcing mesh or the like.

[Operation] In the present invention, the polar rubber containing the specific amount of the white filler forming the intermediate layer can be firmly vulcanized and bonded to the rubber of the inner layer. Moreover, this rubber can be firmly adhered to the outer layer made of a soft vinyl chloride resin or the like with an adhesive.

Therefore, according to the present invention, there is provided a hose in which the rubber of the inner layer and the soft vinyl chloride resin of the outer layer are firmly bonded without treating the surface of the rubber of the inner layer with a halogen gas or a halogen compound.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples as long as the gist is not exceeded.

Examples 1 to 8 and Comparative Examples 1 to 14 NBR-based inner layer rubber was extruded on a mandrel, and then an intermediate layer having a composition shown in Table 1 was coated and laminated, and both were integrally vulcanized.
After that, urethane adhesive (N-302 / 2 / C
-2031, trade name of Nippon Polyurethane) was applied, and an outer layer of a soft vinyl chloride resin was extruded thereon to manufacture a hose having the structure shown in FIG.

Twenty-four hours after coating the outer layer, the adhesive force between the intermediate layer and the outer layer was measured according to JIS K6301. The results are shown in Table 1.

As is clear from Table 1, in the case where the intermediate layer having the specific composition of the present invention is provided, the outer layer and the intermediate layer are firmly bonded by the adhesive, so that the inner layer and the outer layer can be firmly bonded. it can.

[Effects of the Invention] As described in detail above, the hose of the present invention is an intermediate layer made of polar rubber in which a specific amount of white filler is mixed between an inner layer made of synthetic rubber and an outer layer made of soft vinyl chloride resin or the like. The inner layer and the intermediate layer are vulcanized and bonded together, and the intermediate layer and the outer layer are bonded by an adhesive.By interposing this intermediate layer, the inner layer and the outer layer are firmly bonded and integrated. There is something.

Therefore, the hose of the present invention has excellent fatigue resistance and bending resistance, and exhibits extremely excellent durability even in applications under dynamic and severe conditions. Moreover, the hose of the present invention can be easily manufactured without requiring special treatment or equipment,
It is extremely advantageous industrially.

[Brief description of drawings]

1 and 2 are views showing a hose according to an embodiment of the present invention, and FIG. 1 is a sectional view taken along line I-I in FIG.
FIG. 2 is a structural explanatory view. FIG. 3 and FIG. 4 are configuration explanatory views showing other embodiments of the present invention. 1 ... Hose, 2 ... Inner layer, 3 ... Outer layer, 4 ... Intermediate layer, 5 ... Adhesive, 6 ... Reinforcing layer.

Claims (1)

[Claims] 1. A hose having an inner layer made of a synthetic rubber and an outer layer made of a soft vinyl chloride resin, a vinyl chloride thermoplastic elastomer, or a thermoplastic urethane, wherein a polar rubber is provided between the inner layer and the outer layer. An inner layer containing 10 to 100 parts by weight of fine particle silicic acid and 10 to 200 parts by weight of fine particle silicified compound as a white filler with respect to 100 parts by weight of polar rubber so that the total thereof is at least 30 parts by weight, And a middle layer are vulcanized and bonded, and the outer layer and the middle layer are bonded with an adhesive.