Abstract:
An elongated steel element adapted for the reinforcement of rubber products is covered with a ternary alloy or quaternary alloy coating of copper-M-zinc. M is one or two metals selected out of the group consisting of cobalt, nickel, tin, indium, manganese, iron, bismuth and molybdenum. The copper content inside the coating ranges from 58 weight percent to 75 weight percent. The content of the one or two metals inside said coating ranges from 0.5 weight percent to 10 weight percent. The remainder is zinc and unavoidable impurities. The one or two metals are present throughout the coating. Phosphorus is present on and/or in the coating in an amount of more than 1 and less than 4 milligram per square meter of the coating. The coating further comprises one or, ore compounds which complex with the copper in the coating to form an insoluble film on its surface. Good results are obtained for steam ageing and cured humidity adhesion. Furthermore, a corresponding method for manufacturing such an elongated steel element is disclosed.
Abstract:
Process for depositing graphene on the run on the surface (17) of a metallic or metallized continuous reinforcement (R), positioned at the periphery of which is a surface metal layer (Ms) selected from copper, nickel and copper-nickel alloys, said process comprising at least one step of flame spray pyrolysis (FSP), under a reducing atmosphere (13), of a precursor of carbon that generates in the flame at least one carbon-containing gas such as carbon monoxide, which is sprayed on the surface (17) of the reinforcement while running, and decomposes thereon to form one or more layers of graphene at the surface of the surface metal; an additional step of functionalization of the graphene makes it possible to adhere the reinforcement to a polymer matrix such as a rubber matrix.
Abstract:
A load bearing member includes at least one elongated tension member having at least one wire and a protective coating on the elongated tension member. The protective coating includes a first corrosion inhibitor having an oxide-forming metal, a second corrosion inhibitor having a rare earth metal, and a third corrosion inhibitor having an organic material.
Abstract:
Self-adherent composite reinforcement (R-2) adhering, by curing, to a diene rubber matrix, which can be used as reinforcing element for a tyre, comprising: one or more reinforcing thread(s) (20), for example a carbon steel cord; a first layer (21) of a thermoplastic polymer, the glass transition temperature of which is positive, for example a nylon-6,6 polyamide, covering, individually, said thread, each thread, or collectively several threads; and a second layer (22) comprising a functionalized diene elastomer bearing functional groups chosen from epoxide, carboxyl and acid anhydride or ester groups, for example an epoxidized natural rubber, covering the first layer (21). Process for manufacturing such a composite reinforcement; and rubber article or semi-finished product, especially a tyre, incorporating such a composite reinforcement.
Abstract:
A steel cord used for reinforcing rubber product with an oval cross-section has a structure of m+n, while m is the number of core wires (26) and n is the number of the outer layer wires (22). The core wire (26) is untwisted while m is 1 or the core wires (26) are untwisted and aligned in parallel while m is between 2 and 4, and the outer layer wires (22) are twisted around said core wires (26). The core wires (26) are oval wires and the outer layer wires (22) are round wires. The wires (22, 26) in the steel cord have a carbon content not less than 0.60%.
Abstract:
The invention relates to a composite reinforcement (R-2) which is self-adhesive by vulcanisation to a diene rubber die and which can be used as a reinforcement element for a tyre, comprising: one or more reinforcement wire(s) (20), for example a carbon-steel cable; a first layer (21) of a thermoplastic polymer with a positive glass-transition temperature covering said wire(s), for example a 6-6 polyamide; and a second layer (22) covering the first layer (21) and comprising a thermoplastic functionalised unsaturated styrene elastomer with a negative glass-transition temperature, said elastomer containing functional groups selected from among epoxide, carboxyl, anhydride and acid ester groups, for example an SBS-epoxy elastomer. The invention also relates to a method for manufacturing such a composite reinforcement and to a semi-finished rubber product or item, in particular a tyre, including such a composite reinforcement.