Preparation And Surface Modification Of Supfine Silica Particle

As an important chemical material, supfine-silica particles are widely used in rubber、plastic、paint、cosmetic and other field. supfine-silica can improve the quality of these products greatly when being filled into the main materials. Surface modification are expected to solve this problem. So the preparation and utilizable supfine-silica include two main point:the synthesis of supfine-silica and its modification.In this thesis, the mechanism and technology that supfine silica particles are prepared、Heterogeneous Azeotropic Distillation、and modified have been investigated. The different conditions which affect the preparation and modification of silicas have been reviewed. Mensurate it’s density, value of oil suction, value and of water suction and distribution of particle size. The structure and physical properties of silicas powders were characterized by TEM, TG-DTA and BET.The main content and some results as fellows: 1. The conditions of preparation and modification of supfine silicas particas were assured;2. By using1-butanol as heterogeneous azeotropic distillation solvent, reunite is take off, and get higher dispersed silicas;3. By using CTMS、DMDCS and MCTMS as modifier, The best amount of of modifier is15%, DMDCS’s modification effect is the best of three;4. By using KH-550、KH-590and KH-560as modifier, The best amount of of modifier is7.5%;5. By using stearic as modifier of precipitate silicas, token it’s particle size. With heterogeneous azeotropic distillation processing going along, The diameter of particle increased, size distribution are broaden;6. By using stearic and DMDCS as complex modifier, only using5%amount of DMDCS can get best effect of modification.