Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1995-01-05
1998-08-18
Dye, Rena
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 368, 428 3691, 428519, 428520, 428521, 428522, 138126, 138141, 138153, F16L 1104
Patent
active
057956359
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an oil hose having improved copper ion resistance, thermal resistance and resistance to oil leakage at a low temperature.
BACKGROUND ART
As a rubber material for a power steering hose on an automobile and other oil hoses, an acrylonitrile-butadiene copolymer rubber (NBR) has heretofore been used. To make more and more harmless an exhaust gas from an automobile, the temperature in an atmosphere around an engine becomes higher than ever, and the temperature of oil circulating through oil hoses also becomes higher. Conventional NBR hoses have a poor thermal resistance, and therefore, a rubber material having an enhanced thermal resistance is desired.
To meet the demand for thermal-resistant oil hoses, hydrogenated NBR are used which exhibits good thermal resistance and oil resistance. However, hydrogenated NBR has a problem in that oil leakage is apt to be caused at the caulked portion of a hydrogenated NBR hose at a low temperature. This problem cannot be solved even where the oil hose is made of a mixed material composed of NBR and hydrogenated NBR.
DISCLOSURE OF INVENTION
An object of the present invention is to provide an oil hose having a high thermal resistance, an enhanced resistance to oil leakage at a low temperature, and a good resistance to copper ions.
In one aspect of the present invention, there is provided an oil hose (hereinafter referred to as "first oil hose") comprised of an inner layer, an intermediate layer and an outer layer, characterized in that the inner layer, the intermediate layer and the outer layer are made of a vulcanized hydrogenated nitrile rubber composition, a vulcanized conjugated diene rubber composition and a vulcanized ozone-resistant rubber composition, respectively.
In another aspect of the present invention, there is provided an oil hose (hereinafter referred to as "second oil hose") comprised of an inner layer and an outer layer, characterized in that the inner layer is made of a vulcanizate of a hydrogenated nitrile rubber composition comprising a hydrogenated nitrile rubber having an iodine value not larger than 120, which is obtained by hydrogenating the conjugated diene units of a copolymer rubber of an unsaturated nitrile, a conjugated diene and a copolymerizable ethylenically unsaturated monomer, and the outer layer is made of a vulcanized ozone-resistant rubber composition.
BEST MODE FOR CARRYING OUT THE INVENTION
The first oil hose of the present invention has a three-layer structure comprised of an inner layer placed in contact with oil, an intermediate layer formed on the inner layer, and an outer layer exposed to the air.
The inner layer is made of a vulcanizate of a hydrogenated nitrile rubber composition. As examples of the hydrogenated nitrile rubber, there can be mentioned a nitrile rubber obtained by hydrogenating the conjugated diene units of an unsaturated nitrile-conjugated diene copolymer rubber, and a nitrile rubber obtained by hydrogenating the conjugated diene units of a copolymer rubber of an unsaturated nitrile, a conjugated diene and a copolymerizable ethylenically unsaturated monomer. These hydrogenated nitrile rubber may be used either alone or in combination. The hydrogenated nitrile rubber preferably has a Mooney viscosity of 5 to 200. The copolymer rubber to be hydrogenated is comprised of 5 to 60% by weight of units of an unsaturated nitrile monomer, 15 to 95% by weight of units of a conjugated diene monomer and 0 to 80% by weight of units of a copolymerizable ethylenically unsaturated monomer. The hydrogenated nitrile rubber is obtained by hydrogenating this copolymer rubber.
In view of the thermal resistance and copper ion resistance (the copper ion resistance means a resistance to copper ions dissolved out in oil from a copper pipe to which the hose is connected), required for the hose of the present invention, the degree of hydrogenation should be such that the iodine value as measured according the Japanese Industrial Standard is not larger than 120, preferably 1 to 80, and more
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patent: 4905735 (1990-03-01), Akiyoshi
patent: 4957792 (1990-09-01), Shizuo et al.
patent: 4988548 (1991-01-01), Takemura et al.
patent: 5093166 (1992-03-01), Nishimura
patent: 5356681 (1994-10-01), Ichikawa et al.
patent: 5380571 (1995-01-01), Ozawa et al.
Dye Rena
Nippon Zeon Co. Ltd.
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