天然橡胶发泡胶球的研制

用天然橡胶制备彩色发泡胶球,研究了发泡剂及发泡助剂、硫化体系、填充体系、混炼和硫化工艺以及发泡工艺等对发泡胶球品质的影响。结果表明,发泡剂选用二亚硝基五亚甲基四胺与小苏打和尿素脂BK并用体系可使胶球的泡孔细密均匀,气味很小;硫化体系采用临界温度较低的促进剂TT、CZ及M与硫黄并用能使硫化程度与发泡速率很好地匹配;选择轻质碳酸钙和滑石粉作为填充体系、使用门尼黏度为20～40的胶料及采用二段硫化工艺时所制备发泡胶球的泡孔细密、结构理想,发泡倍率与国外胶乳发泡制品相当。

Preparation of natural rubber foaming ball

A colored foaming rubber ball was prepared by natural rubber,and the effects of foaming agent and its auxiliary,vulcanizer system,filler system as well as compounding,foaming and vulcanizing processes on the quality of foaming ball were investigated.The results showed that the smell of the rubber ball was small and the foam was fine and uniform when 3,7-dinitroso-1,3,5,7-tetraazobicyclo-nonane with sodium bicarbonate and urea grease BK were selected as foaming agents;degree of vulcanization and foaming rate were well matched when low critical temperature accelerators were selected,such as accelerators TT,CZ and M;the foam and structure of rubber ball were well and foaming rate was equal to that of foreign products when the precipitated calcium carbonate and talcum powder were selected as fillers and the rubber with Mooney viscosity 20-40 was used as matrix in two-stage vulcanization.