Journal of Dalian Maritime University >
2020 , Vol. 46 >Issue 1: 131 - 136
DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2020.01.015
Study on surface modification and properties of silica
Received date: 2019-09-19
Revised date: 2019-11-21
Online published: 2019-11-21
In order to improve the affinity of silica to organic polymers, the surface of silica particles was modified by coupling agent with the structure characteristics of lipophilic and hydrophilic groups. The effects of modification time, temperature, pH and the mass ratio of coupling agent to silica on the surface modification of silica were investigated. The structure and modification effect of silica before and after modification were characterized by means of infrared spectrum, thermogravimetry, nitrogen adsorption desorption, contact angle, activation degree and sedimentation volume test. The results show that the modification effect of γ-methylpropenylpropyltrimethoxysilane (KH570) is better than that of γ-mercaptopropylethoxybis (propane hexaethoxy siloxane) (Si747) and bis(γ-triethoxysilypropyl) tetrasulfide (Si69). Taking anhydrous ethanol as modifier, when the mass ratio of KH570 to silica is 14%, the modification temperature is 50 ℃, the pH is 7, and the modification reaction is 6 hours, the activation degree reaches the maximum. After the modification, the coupling agent is grafted on the surface of silica, the hydrophilicity is reduced, the dispersibility improved, and the surface wettability is obviously improved, which widen the industrial application scope of silica.
Key words: silica; coupling agent; KH570; KH550; Si747; surface modification; hydrophobic
SUN Rui-ting , DUAN Shi-bo , LIAO Ming-yi . Study on surface modification and properties of silica[J]. Journal of Dalian Maritime University, 2020 , 46(1) : 131 -136 . DOI: 10.16411/j.cnki.issn1006-7736.2020.01.015
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