Shape of particles: most particulate filler is a particulate inorganic filler or a mineral from the rock made by different methods, due to the shape of the unevenness of crushing, the particles are generally irregular, or even somewhat difficult to describe the shape of the filler particles. Flaky, fibrous filler so that the processing performance deteriorated, but the good mechanical properties; amorphous powder, spherical the processing performance, mechanical properties worse than flaky and fibrous.
The size of the particles: the filler particles generally 0.1 ~ 10um particle size as well. In favor of fine fillers mechanical properties of products, dimensional stability and surface gloss and feel products. But particle size of the dispersion difficult, if not enough processing equipment dispersing ability will affect the quality of the product. Thus what the actual production of filler particle size chosen should be based on the type of plastic processing equipment decomposing different and can not be generalized.
The surface area of the particles: the particle size of the surface area of the filler is one of the most important properties, the surface area of the filler many performance related thereto. Increasing the surface area of the filler and Adsorption beneficial surfactants, dispersants, surface modifying agents as well as polar polymers or chemically react with the filler surface. When large quantities of fillers added some resin, friction material in the molding process is increased, while reducing the thermal stability of plastics, on the other hand there is the accelerated wear of equipment problems, so should be appropriate in the formulation increasing the amount of stabilizer and lubricant.
