【摘要】 采用逆絮凝法制备天然橡胶(NR),研究酸凝固剂、无机盐凝固剂和无机盐复合凝固剂及絮凝条件对天然胶乳絮凝效果及NR性能的影响。结果表明:酸作为凝固剂时,硫酸的絮胶效果比乙酸、甲酸好,三者制得NR的物理性能相差不大。采用无机盐作为凝固剂时,氯化钙的絮胶效果良好,且当氯化钙质量分数为0.02时,制得NR性能基本与云南标准胶、烟胶片参比试样性能相当。采用无机盐复配凝固剂时,氯化钙/氯化钠凝固剂的絮胶效果良好,制得NR性能优于云南标准胶、烟胶片参比试样性能。适当提高温度及搅拌速度均有利于天然胶乳的絮凝。更多还原

【Abstract】 NR was prepared by using reverse flocculation method,the effects of acid coagulants,inorganic salt coagulants,inorganic salt complex coagulant and coagulation conditions on the coagulation of natural rubber latex and the properties of NR were investigated.The results showed that,the coagulating effect of sulfuric acid was better than that of acetic acid or formic acid,and the physical properties of the three NR compounds were mainly equivalent.In inorganic salt coagulants,better coagulation effect of natural rubber latex was obtained by using calcium chloride.When the mass fraction of calcium chloride was 0.02,the physical properties of NR compound were similar to those of smoked sheet and standard rubber from Yunnan.When the inorganic salt complex coagulant was used,the flocculation effect was good by using the calcium chloride/sodium chloride,and the properties of NR compound were better than those of comparison sample.Appropriately increasing the temperature and stirring speed could also improve the flocculation of natural rubber latex.更多还原