Study On The Preparation Of Rubber-Metal Cobalt-Nickei Adhesion Promoter

The rubber-metal adhesion promoter of cobalt boroacylate and nickel boroacylate was synthesized. In the meantime, the optimal synthesis conditions ofβ-Co(OH)2 required for synthesis of cobalt boroacylate were studied and optimized by the Response Surface Methodology (RSM).First of all,β-Co(OH)2 was synthesized with cobalt sulfate, sodium hydroxide as raw materials, ammonia as complexing agent, and ascorbic acid as protective agent. The effects of reaction temperature, concentration of NaOH, molar ratio of complexing agent to cobalt sulfate on the yield were investigated, which the reaction conditions were analyzed by the Response Surface Methodology (RSM) with three factors and three levels, and a correlation model on the optimized synthesis yield ofβ-Co(OH)2 was presented. The optimal synthesis conditions ofβ-Co(OH)2 with ascorbic acid were as follows:reaction temperature,79℃, concentration of NaOH,2.89 mol/L, ratio of complexing agent to cobalt sulfate,2.19, and the optimized yield,97.40%. The structure and morphology of the product were verified by XRD and SEM.Mixed organic acid cobalt was synthesized with cobalt hydroxide, monoprop, isocaprylic acid as raw materials, dimethylbenzene as entrainer by the salt-forming reaction. The rubber-metal cobalt salt adhesive, boronacylate cobalt, was synthesized with tributyl borate by the acylation reaction. For the salt-forming reaction, the effects of entrainer, reaction temperature and time on the synthesis of mixed organic acid cobalt were studied. The optimized synthesis conditions of salt-forming reaction were determined as follows:dimethylbenzene as entrainer, reaction temperature,115℃, reaction time,3.5 h. For the acylation reaction, the Response Surface Methodology (RSM) was used to optimize the reaction temperature, reaction time and molar ratio of tributyl borate to cobalt hydroxide to obtain the highest content of cobalt. The analysis results showed that the response variables were affected significantly by the reaction temperature, the molar ratio of tributyl borate to cobalt hydroxide, and the interactions between temperature and molar ratio of tributyl borate to cobalt hydroxide. The optimized synthesis conditions of cobalt boroacylate were obtained, which the reaction temperature,174℃, reaction time,2.6 h and molar ratio of tributyl borate to cobalt hydroxide,0.34:1, with the optimized cobalt content,22.4%. The chemical sturcture and physical and chemical properties of cobalt boroacylate were tested, respectively, which the results show that the national standards of cobalt boroacylate were reached.Mixed organic acid nickel was synthesized with nickel carbonate, monoprop, isocaprylic acid as raw materials, dimethylbenzene as entrainer for salt-forming reaction. The rubber-metal adhesive, nickel boronacylate, was synthesized with tributyl borate by the acylation reaction. For the salt-forming reaction, the effects of entrainer, reaction temperature and time on the synthesis of mixed organic acid nickel were studied. The optimized synthesis conditions of salt-forming reaction were determined as follows:dimethylbenzene as entrainer, reaction temperature,110℃, reaction time,2 h. For the acylation reaction, the Response Surface Methodology (RSM) was used to optimize the reaction temperature, the reaction time and the molar ratio of tributyl borate to nickel carbonate to obtain the highest content of nickel, and a correlation model on the optimized synthesis of nickel boroacylate was presented. The analysis results showed that the response variables were affected significantly by the reaction temperature and the reaction time. The optimized synthesis conditions of nickel boronacylate were obtained, which the reaction temperature,198℃, reaction time,6.5 h, and molar ratio of tributyl borate to nickel carbonate,0.33:1, with the optimized nickel content,24.1%. The chemical structure and the physical and chemical properties were tested, respectively, which the results show that the national standards of nickel boronacylate are reached.