对氨基水杨酸镧对天然橡胶硫化特性的影响  

Effect of lanthanum p-aminosalicylate on vulcanization characteristics of natural rubber

作　　者：刘永刚 郝伟[1] 张文涛 柳召刚[1] 胡艳宏[1] 吴锦绣[1] 马瑞峰 杜桂芳 LIU Yong-gang;HAO Wei;ZHANG Wen-tao;LIU Zhao-gang;HU Yan-hong;WU Jin-xiu;MA Rui-feng;DU Gui-fang(Ministry of Education Key Laboratory for Green Extraction and Efficient Use of Light Rare Earth Resources/Inner Mongolia Key Laboratory of Rare Earth Hydrometallurgy and Light Rare Earth Applications,School of Materials and Metallurgy,lnner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院/轻稀土资源绿色提取与高效利用教育部重点实验室/内蒙古自治区稀土湿法冶金与轻稀土应用重点实验室,内蒙古包头014010

出　　处：《合成橡胶工业》2024年第1期57-62,共6页China Synthetic Rubber Industry

基　　金：内蒙古自然科学基金资助项目(2022 LHMS05022)。

摘　　要：以氯化镧和对氨基水杨酸钠为原料,采用沉淀法合成了新型环保促进剂对氨基水杨酸镧(PAS-La)。通过元素分析、热分析和红外光谱分析等方法对产物进行了表征并确定其分子式为La(C_(7)H_(6)NO_(3))_(3)·H_(2)O。利用无转子硫化仪、平衡溶胀法和万能试验机考察了PAS-La对天然橡胶硫化特性、交联密度和力学性能的影响,并对硫化动力学进行了分析。结果表明,随着PAS-La添加量的增加,天然橡胶的正硫化时间存在最大值,焦烧时间先减小后增大;硫化胶的交联密度增大,力学性能明显增强。当PAS-La的添加量为1.2份(质量)时,其对天然橡胶的硫化促进作用达到最佳。动力学计算发现,随着PAS-La添加量的增加,交联前驱体的反应活性增强,活化能先减小再增大。Lanthanum chloride and sodium p-aminosalicylate were used as raw materials to synthesize a new environmental-friendly accelerator lanthanum p-aminosalicylate(PAS-La)by precipitation method.The product was characterized and its mole-cular formula was determined to be La(C_(7)H_(6)NO_(3))_(3)·H_(2)O by elemental,thermal and infrared spectral analysis.The effects of PAS-La on the vulcanization characteristics,crosslinking density and mechanical pro-perties of natural rubber were investigated using rotorless vulcanzation apparatus,equilibrium swelling method and universal testing machine,and the vulcanization kinetics were analyzed.The results showed that with the increase of PAS-La amount,there was a maximum value of positive vulcanization time of natural rubber,and the scorch time firstly decreased and then increased.The crosslinking density of vulcanized rubber increased,and the mecha-nical properties were significantly enhanced.When PAS-La was added at amount of 1.2 phr(by mass),its vulcanization promotion effect on natural rubber was optimal.Kinetic calculations revealed that the reactivity of the crosslinked precursors was enhanced with the increase of PAS-La amount,and the activation energy decreased first and then increased.

关 键 词：对氨基水杨酸镧 天然橡胶 硫化促进剂 稀土 活化能 

分 类 号：TQ330.38*5[化学工程—橡胶工业]