What are the surface modification technologies of calcined kaolin and the matters needing attention?
At present, the modified calcined kaolin is mainly applied to the organic products industry, with the industry of organic raw material, processing technology and technical performance requirements are different, so the surface modification of calcined kaolin to put forward an important problem that how to adapt and meet the requirements, and can display the function of modified kaolin.The modified kaolin can play a functional role, first of all technical aspects should pay attention to all kinds of organic polymer products raw materials and production process, is not able to complement each other, in the process of phase cancellation, careful analysis of raw material quality, specifications and design of process parameters and process conditions, these factors can affect the application effect of modified kaolin.In order to improve the surface modification of kaolin, it is necessary to understand the main technical requirements, main raw materials and processing technology of organic polymer products. Should be based on this, targeted to select good modifier, adjust the formula of modified agents, determine the reasonable processing technology.
During the surface modification of calcined kaolin, it is necessary to react at a certain temperature. So, first of all to the calcined kaolin dynamic heating to a certain temperature (100 DEG C), in the high dynamic condition, adding after hydrolysis of silane coupling agent or compound modifier, adding to the best atomization. During the reaction between the coupling agent and kaolin, the temperature should be kept within 120 degrees, and at high speed, the time should be about 3-5 minutes.In addition, surface modification of kaolin and the reaction process, often produce false knot particles, the impact on the quality of the products is given, so the need for effective classification, only in this way can we fully guarantee the quality of products.
The surface modification of calcined kaolin should be done by heating the calcined kaolin in order to react with silane coupling agent and requiring kaolin to maintain a certain temperature in the dynamic state. Only in this way can the excess water in the reaction process and reaction be removed so as to form a stable and firm covalent bond with kaolin. Therefore, it is necessary to determine the surface modification process according to the mechanism of surface modification.
Calcined kaolin is a kind of mineral material with high whiteness, large specific surface area, good insulation and good thermal stability, which is calcined, dehydrated and removed volatile substances. Calcined kaolin has excellent chemical corrosion resistance, solvent resistance, acid and alkali resistance and good reinforcing and processing performance, widely used in paints, coatings, paper, rubber and plastic products, cable, ceramics and other industries.
