液相改性对白炭黑表面活性位点的影响  

Effect of Liquid Phase Modification on Active Sites of Silica Surface

作　　者：张良[1] 李晓林[1] 韩冬礼 蔺延喜 ZHANG Liang;LI Xiaolin;HAN Dongli;LIN Yanxi(Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学有机无机复合材料国家重点实验室,北京100029

出　　处：《橡胶工业》2020年第6期410-414,共5页China Rubber Industry

摘　　要：先采用偶联剂KH590与分散剂MOA液相改性白炭黑制备改性白炭黑水浆,然后分别制备干法混炼和湿法混炼天然橡胶(NR)/白炭黑母炼胶,再在后期混炼时补加偶联剂Si69,通过制备NR/白炭黑纳米复合材料并对其性能进行研究,考察液相改性后的白炭黑表面是否还有剩余活性位点与偶联剂Si69反应。结果表明,后期补加的偶联剂Si69无法接枝在白炭黑表面而起到偶联作用,不能改善白炭黑在橡胶基体中的分散性和NR/白炭黑纳米复合材料的性能,液相改性后的白炭黑表面活性位点已全部被占据。In this study,silica was modified in liquid phase by using silane coupling agent KH590 and dispersant MOA to get modified silica slurry.Then natural rubber(NR)/silica masterbatches were prepared by dry-mixing method and wet-mixing method,respectively.The coupling agent Si69 was added to masterbatches during subsequent mixing,NR/silica nanocomposites were obtained and their properties were studied,and whether there were resiclual active sites on the liquid phase modified silica surface to react with coupling agent Si69 was investigated.The results showed that the coupling agent Si69 added subsequently could not be grafted on the silica surface to play coupling role,and the dispersion of silica in the rubber matrix and the performance of NR/silica nanocomposites were not improved with the addition of coupling agent Si69.The active sites on the liquid phase modified silica surface were all occupied.

关 键 词：白炭黑 活性位点 液相改性 硅烷偶联剂 分散剂 天然橡胶 母炼胶 

分 类 号：TQ330.383[化学工程—橡胶工业] TQ330.387