Synthesis and properties of rubber-steel cord adhesion promoter nickel borate acylate

The synthesis of nickel borate acylate (NBA), a kind of rubber-steel cord adhesion promoter (AP), through nickel carbonate, borate and mixed carboxylic acid was studied. Nickel carbonate could be prepared by the reaction of nickel sulfate with sodium carbonate in aqueous solution. After strong stirring for 2 h, the mixed nickel carboxylate could be synthesized by the reaction of nickel carbonate with isooctanoic acid and acetic acid. The mole ratio of these chemicals was 1: 1: 1.1. NBA was synthesized by reaction of mixed nickel carboxylate with tributyl borate under strong stirring at 200similar to250 degreesC for 6 h. By detecting and comparing with 680C product from Manobond Company of England, the NBA synthesized through isooctanoic acid and tributyl borate is very similar with 680C in IR data, 300% fixed extension strength, tensile strength, hardness and cure curve. However, tensile failure extensibility and hot air aging of NBA are a little lower than those of 680 C. The experimental results show that NBA can be used as rubber-steel cord AP.