Hose construction
AssigneeThe Goodyear Tire & Rubber Company
InventorsMervin V. Pilkington, Robert W. Cole, Robert C. Schisler
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Abstract
This invention is concerned with a hose construction particularly suitable for Freon service in refrigeration systems. The hose comprises (1) a core tube of polyamide covered by an elastomeric friction layer such as EPDM rubber having incorporated therein a calcium ion source and an adhesion system and a curative, (2) a layer of tensioned reinforcement strands, (3) an adhesive/barrier/friction layer such as an ethylene acrylic acid copolymer, (4) a second layer of tensioned reinforcement strands, and (5) a cover selected from chlorobutyl rubber or other suitable materials wherein the chlorobutyl rubber utilizes a bis-dienophile as a crosslinker.
Claims17
A hose comprising:
- (1) a polyamide core;
- (2) an elastomeric friction layer comprising (a) a base polymer selected from EPDM's, copolymers of butadiene, polychloroprene, polybutadiene, polyisoprene or mixtures thereof, (b) a calcium ion source selected from the group comprising calcium stearate, calcium alkoxides of 1 to 10 carbon atoms, calcium hydroxide, calcium oxide and calcium carbonate, (c) a resorcinol or phenolic based adhesive system, and (d) a peroxide or sulfur curative;
- applied to the outer surface of the core and adhered directly thereto after curing;
- (3) a first layer of reinforcement strands tensioned about the elastomeric friction layer;
- (4) an adhesive/ barrier/friction layer comprising a compound selected from natural and synthetic elastomers and copolymers of ethylene and acrylic acid;
- (5) a second layer of reinforcement strands tensioned about the adhesive/ barrier/friction layer;
- and (6) a halobutyl rubber cover wherein the halobutyl rubber contains a bis-dienophile as a crosslinker.
A process for the preparation of a reinforced hose construction which comprises;
- (a) forming a core tube of polyamide:
- (b) applying a coating of polymer to the core tube, the coating being in a range of 0.1 mm to 2 mm, the coating comprising a base polymer, an adhesive system, a calcium ion source, and a curative for the base polymer;
- (c) applying a fibrous reinforcement over the coated tube;
- (d) applying a layer of an ethylene acrylic acid copolymer;
- (e) applying a second layer of fibrous reinforcement over the ethylene acrylic acid copolymer;
- (f) applying a halobutyl rubber cover over the second layer of reinforcement which contains a bis-dienophile crosslinker;
- and
- (g) open steam curing the hose to result in a reinforced hose having excellent Freon and water impermeability.
A multi-element hose, the improvement comprising the use of an elastromeric friction layer between the core tube and the reinforcement layer, said elastomeric friction layer comprising:
- (a) a base stock selected from EPDM's, copolymers of butadiene, polychloroprene, polybutadiene, polysioprene, or mixtures thereof;
- (b) a calcium ion source;
- (c) a resorcinol or phenolic based adhesive system;
- and
- (d) a peroxide or sulfur curative.
Dependencies are inferred from the claim text.