Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1991-11-01
1994-08-30
Zimmerman, John
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428659, 428939, 57902, B32B 1506, D07B 106, B60C 900
Patent
active
053426991
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a substrate for reinforcement of elastomeric polymers wherein at least part of the substrate is made of steel. Steel wires and cords comprising steel wires twisted together (possibly together with other synthetic filaments such as aramid fibers) are often used for reinforcing rubber products such as tires, belts and hoses. In view of securing a proper and durable adhesion to the rubber, the wire surfaces are generally coated with an alloy layer such as brass or zinc.
Besides a proper adhesion capacity, the coating layer should preferably also protect the wires against corrosion attack. Indeed, corrosion of the reinforcing steel structure should always be avoided as the reinforcing effect decreases as a consequence of corrosion. Besides exposure of the steel elements to atmospheric corrosion before their embedment into rubber, corrosion attack is also possible after such embedment, especially when incisions in the rubber, which reach the wire surfaces, are produced.
Numerous efforts have been made up to now to design specific coating layers for steel wires which offer a good adhesion capacity (also after ageing of the reinforced composite) in combination with a proper corrosion resistance. Unfortunately, the application of those coating layers requires quite complicated processes which generally raise the production cost of the coated reinforcing material. Further, the coating process often becomes quite critical when steel wires are involved with elevated tensile strength e.g. over 3000 N/mm.sup.2, as those wires often require specific manufacturing processes.
SUMMARY OF THE INVENTION
It is now a primary object of the invention to provide a relatively simple coating composition and process for a reinforcing steel substrate which offers adequate adhesion strength (and adhesion retention after ageing) to the surrounding elastomeric matrix combined with an improved resistance against static and dynamic corrosion attack. In particular it is an object of the invention to provide a reinforcing substrate for elastomeric polymers as defined in claim 1.
It is a second object of the invention to provide such coatings on steel wire substrates with an elevated tensile strength.
According to another object of the invention, a bundle, e.g. a twisted cord or cable is provided comprising a number of said steel wires, possibly combined with filaments of other material.
Another object of the invention deals with the combination of steel wires of different kinds in said bundle or cord, e.g. wires with different diameter and/or strength.
Yet another object of the invention relates to the combination of the simple coating composition and/or process with the deposition of a specific sublayer and/or top layer of another material in view of meeting specific requirements for adhesion and/or corrosion resistance.
A further object of the invention resides in methods and means for manufacturing and using said steel substrates ,and said combinations of substrates.
An additional object of the invention concerns the elastomeric products reinforced with said substrates such as conveyor belts, transmission belts, (high pressure) hoses, tires etc.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to the invention, the relatively simple coating layer composition for the reinforcing substrate comprises an alloy which, apart from impurities, consists of between 4.5 and 6.5wt. % of aluminium, possibly less than 0.1% of at least one element stimulating the wetting ability of the liquid alloy to the substrate and the balance zinc. At least a part of the substrate is made of steel, and the above coating layer composition is applied to at least some portions of said part.
It is known from the Japanese patent application 59-173257 to coat a wire with a Zn alloy including 2.5 to 7% Al.
The weight of said layer according to the invention is between 10 and 60 g per m.sup.2 of the covered surface of the substrate. Steel wire is a suitable reinforcing substrate. The steel ther
REFERENCES:
patent: 2296838 (1942-09-01), Domm
patent: 3858635 (1975-01-01), Nakamoto et al.
patent: 4202921 (1980-05-01), Enghag
patent: 4592935 (1986-06-01), Sato et al.
patent: 4704337 (1987-11-01), Coppens et al.
L. Peeters et al., International Polymer Science and Technology, vol. 11, No. 10, 1984, "New Developments in Steel Cords for Tyres", pp. T53-T60.
DeWitte Marc
Van Raemdonck Walther
N. V. Bekaert S.A.
Zimmerman John
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