What are the surface modification methods and processes of wollastonite?
The treatment of wollastonite with silane coupling agent by surfactant modification can greatly improve its compatibility with polymer and enhance the filling effect, but the production cost of silane coupling agent modified is higher. Therefore, in some applications, the available surface active agent is cheaper, such as stearic acid (salt), quaternary ammonium salt, polyethylene glycol, fatty alcohol polyoxyethylene ether (nonionic surfactant) on surface modification of wollastonite powder. These surfactants are coated on the surface of particles by polar groups and particles, which can greatly enhance the lipophilic properties of wollastonite fillers... Details can be seen on the powder technology.
Wollastonite commonly used surface modification agent: at present, the wollastonite commonly used surface modification is the main agent of silane coupling agent, titanate and aluminate coupling agent, surface active agent and methyl methacrylate. 1 silane coupling modified silane coupling modification is one of the commonly used surface modification methods of wollastonite powder. The process of dry modification is generally used, and the amount of coupling agent is related to the required coverage and the specific surface area of the powder. Amino silane treatment of wollastonite, wollastonite content is 0.5% of the weight; methacryloyl oxygen containing silane dosage of wollastonite weight 0.75%, these two kinds of modified products were filled with nylon 6 and polyester instead of 30% glass fiber can significantly improve the mechanical properties of the products.
Wollastonite is a calcium metasilicate mineral, often white and greyish white, with a glassy luster to a pearly luster. Because of its non-toxic, chemical corrosion resistance, thermal stability and dimensional stability, good mechanical and electrical properties, as well as strengthening and other advantages, it is widely used as reinforced fillers for polymer matrix composites.
