Rubber-metal bonding enhancer for steel wire radial tyre and preparation method thereof

Abstract

The invention belongs to the field of rubber chemicals and discloses a rubber-metal bonding enhancer for a steel wire radial tyre. The enhancer is prepared from four kinds of metal salts of cobalt, nickel, copper and zinc; and the proportion of the metal salts by metal molar mass: cobalt: nickel: copper: zinc is (50% to 70%): (20% to 40%): (6% to 10%): (2% to 4%). The preparation method of the bonding enhancer comprises the steps of: using the four kinds of metal salts as starting materials to sequentially prepare alkali carbonate metal composite salt by a temperature gradient method and a concentration step method, prepare an intermediate by a continuous dehydration method and prepare low cobalt boroacylate metal composite salt by a boroacylate replacement reaction to obtain the bonding enhancer. In the invention, the proportion of the cobalt is regulated to 50% to 70% from 100% in a traditional technology; and the consumption of precious metal cobalt is reduced; the cost is reduced by 10% to 20%. The physical and chemical indexes and utilization property of the product of the invention are equivalent to those of a boroacylate cobalt product; and the drawing force and retention rate of an aged product are better than those of the boroacylate cobalt product.

Description

technical field [0001] The invention belongs to the field of rubber additives, in particular to a rubber-metal adhesion enhancer for steel wire radial tires with low cobalt content. Background technique [0002] In the process of producing steel wire radial tires, the rubber in contact with the steel wire ring belt and the steel wire belt needs to be added with a cobalt salt binder during the rubber mixing process to improve the adhesion between the steel wire and the rubber and maintain a continuous Adhesive effect to reduce the possibility of tire blowout under load and high-speed operation, and improve the safety, performance and life of steel radial tires. [0003] The prescription and production method of existing cobalt salt binder are: [0004] ① Metal ratio: 100% cobalt metal (in the form of cobalt sulfate or cobalt chloride); [0005] ②Basic cobalt carbonate production: Dissolve cobalt sulfate or cobalt chloride to a 30% concentration solution in the reaction kett...

AI Technical Summary

Problems solved by technology

[0016] ① Formulation problem: Cobalt is a scarce resource and is expensive. The existing technology uses 100% cobalt inorganic salts to produce, and the cost of inorganic cobalt salts accounts for 70% of the material cost of a ton of boroacylated cobalt products, and the product cost is very high;

[0017] ②Problems in the production of basic cobalt carbonate: the dispersion of lye is not enough, the concentration of lye is high, and the concentration of metal ions is also high at this time. The added lye reacts sharply with metal inorganic salts, and it is easy to generate carbonates of standard structure instantly (that is, what we usually call local over-alkali), although the standard structure of carbonate crystals is relatively coarse and easy to precipitate, but its reactivity with weak organic acids is not enough

Due to the different oxidation rates of cobalt ions, the formula is out of balance, which affects the physical and chemical properties and performance of the product

[0022] ④ Cobalt boroacylate products are extremely easy to absorb moisture and oxidize during storage, which affects the adhesive performance of the product

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