Modification method for improving hydrophobicity and dispersion stability of nano TiO2

• Main Authors: WANG GAOQI, WANG SHOUREN, YANG XUEFENG, LI WANYANG, HOU QIMIN, DUAN DERONG, LIU WENTAO, XIAO JUPENG, QIAO YANG, WEN DAOSHENG
• Format: Patent
• Language: Chinese; English
• Published: 21.04.2020
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

Based on the defects of high surface energy, easy agglomeration, difficult infiltration in an organic phase, poor dispersion stability and the like of nanoparticles, the invention provides a modification method for improving hydrophobicity and dispersion stability of nano TiO2. The method comprises the following steps: adding an aqueous solution of a modifier N-octyltrimethoxysilane or dodecyl trimethoxysilane into an ethanol solution of nano TiO2, stirring at 60-90 DEG C, carrying out ultrasonic oscillation, drying, and grinding to obtain modified nano TiO2. According to the invention, the surface energy of the modified nano TiO2 is obviously reduced, the hydrophobic property is achieved, and the dispersion stability is greatly improved; and the method is simple in process, easy to operate, low in cost, high in production efficiency and easy to realize industrial production. 针对纳米级粒子的表面能高，容易发生团聚，在有机相中难以浸润和分散稳定性差等缺点，本发明提供了一种提高纳米TiO疏水性和分散稳定性的改性方法。本发明将改性剂N-辛基三甲氧基硅烷或者十二烷基三甲氧基硅烷的水溶液，加入到纳米TiO的乙醇熔液中，60℃-90℃下搅拌、超声震荡、