混炼温度对Si-69原位改性白炭黑填充天然橡胶硅烷化反应的影响  

Effects of mixing temperature on silanization reaction natural rubber composites filled with Si-69 in situ modified silica

作　　者：刘涛[1] 孙雪洋[1] 杜爱华[1] 

机构地区：[1]青岛科技大学橡塑材料与工程教育部重点实验室,山东青岛266042

出　　处：《合成橡胶工业》2017年第1期33-37,共5页China Synthetic Rubber Industry

摘　　要：通过控制混炼工艺研究了温度对Si-69原位改性白炭黑填充天然橡胶(NR)硅烷化反应的影响,利用硫化仪、橡胶加工分析仪、核磁共振交联密度仪以及全反射红外光谱仪等对白炭黑的填料网络结构及与NR的相互作用进行了分析。结果表明,在混炼时间一定的条件下,较高的混炼温度(150℃)有利于白炭黑与Si-69的硅烷化反应,NR混炼胶的Payne效应较弱,白炭黑在橡胶基质中的填料网络化结构也较弱,白炭黑的絮凝速率较慢;NR混炼胶的物理交联密度较大,分子链运动更加受限,白炭黑与NR间的相互作用较强;此时全反射红外光谱分析结果显示白炭黑填充NR混炼胶的羟基吸收峰较小,说明白炭黑表面的羟基减少,极性减弱。The effects of mixing temperature on si- lanization reaction of natural rubber （NR） compo- sites filled with Si-69 in situ modified silica were in- vestigated by controlling the mixing condition. The interaction of silica filler network structure with NR matrix was analyzed by vulcameter, rubber process- ing analyzer, nuclear magnetic resonance crosslink- ing density spectroscopy and attenuated total reflec- tance infrared spectroscopy （ATR-FTIR）. The re- suits showed that the higher mixing temperature （150 ℃ ） was beneficial to the silanization reaction between silica and Si-69 on the premise of the same mixing time. The silica filled NR composites in situmodified by Si-69 at 150 ℃ possessed lower Payne effect, weaker filler network structure and slower silica flocculation rate. Besides, the physical crosslinking density of NR composites at 150℃ was higher, chain segment movement was more restricted indicating a stronger silica - NR interaction. The ATR-FTIR results showed that the hydroxyl absorb- tion peak of silica filled NR composites at 150 ℃ was smaller than that at lower mixing temperature, which demonstrated that the amount of hydroxyl on the silica surface decreased and the polarity weaken

关 键 词：混炼温度 硅烷化反应 天然橡胶 白炭黑 PAYNE效应 

分 类 号：TQ332.5[化学工程—橡胶工业]