叶蜡石粉体的偶联活化改性研究

Coupling Activation Modification for Pyrophyllite Powder

本工作对叶蜡石进行了偶联活化改性研究,使得叶蜡石从亲水性粉体转变为憎水性粉体。在本研究中,叶蜡石粉体通过在表面偶联一层N-(正丁基)-3-氨丙基三甲氧基硅烷(BAPTS)偶联剂进行活化处理,研制出活化指数达到100%的改性叶蜡石粉体。通过活化指数、黏度、表面接触角等手段,对叶蜡石表面偶联改性情况进行了表征,并对活化机理进行了分析讨论。研究了活化指数、黏度、表面接触角与偶联性能之间的关系。结果表明:偶联剂的添加量为1.0%(质量分数,下同)时,活化指数达到100%。偶联剂添加量为1.5%时,改性叶蜡石-液体石蜡体系的黏度达到最大值85.78mPa.s。偶联剂的添加量为2.0%时,对水的表面接触角达到最大值75°。偶联修饰是制备活化叶蜡石粉体的一种有效方法,能够使偶联剂与叶蜡石粉体形成牢固结合。

The coupling activation modification as well as the coupling mechanism of the functionalized pyrophyllite powder from Taishun,Wenzhou,China,were investigated.The functionalization process changed the hydrophilic nature of the pyrophyllite powder into hydrophobic.The surface of pyrophyllite powder was modified by coating with N-（n-butyl）-3-aminopropyltrimethoxysilane（BAPTS） coupling agent and the pyrophyllite powder with activation index 100% was prepared.Activation index,viscosity and surface contact angle analyses were used to characterise the surface coupling modification for pyrophyllite powder and the activation mechanism was analysed and discussed.The relationships among activation index,viscosity,surface contact angle and the final coupling properties for pyrophyllite powder were investigated.The results indicate that the activation index arrives at 100% when the addition of coupling agent is 1.0% mass fraction.The maximum viscosity of the pyrophyllite-atolin system arrives at 85.78 mPa·s when the addition of coupling agent is 1.5% mass fraction.The maximum surface contact angle on water arrives at 75° when the addition of coupling agent is 2.0% mass fraction.The coupling modification can provide a useful method of preparation of the activation pyrophyllite powder with the achievement of a fine and a strong adhesion level.