Talc masterbatch is a plastic modified filler, which refers to the main component of talc powder, which is formed by mixing with polymers or other carriers for granulation. It is mainly used in the improvement of properties such as rubber, plastic resins, etc. Material stiffness, high temperature creep resistance, heat resistance and other properties. Talc powder manufacturers
Talc is an aqueous, layered silicate mineral. Chemical formula: Mg3(Si4O10)(OH)2. Its chemical composition: MgO is 31.8%, SiO2 is 63.37%, H2O is 4.7%, and often contains a small amount of Fe, A1 and other elements. The density of talc is 2.7~2.8g/cm, the hardness is the smallest among the mineral fillers, the Mohs hardness is 1, and it has a soft and smooth feeling. Its colors are white, gray-green, milky white, light red, light blue, light gray, etc., with pearl or fat luster. The water of association can be lost at 380~500℃, and the water of crystallization is lost when the temperature is above 800℃. Talc is slightly alkaline in water with a pH of 9.0~9.5.
Talc has a layered structure, and two adjacent layers are bound by weak van der Waals forces. When the external force acts, the two adjacent layers are easily slipped or separated from each other. Therefore, the basic shape of the talc particle structure is flaky or scaly.
The flaky structure of talc powder greatly improves some properties of talc-filled plastics, and some people regard talc powder as a reinforcing filler. First, talc can improve the stiffness and creep resistance of the filler material at high temperatures. When the talc particles are arranged along the material flow direction during processing, according to the principle of least resistance, the arrangement is basically in the form of flakes, which are connected by small pieces into large pieces. Therefore, the stiffness of the material can be significantly increased in a specific direction. Secondly, talc can significantly improve the heat resistance of filler materials. The heat distortion temperature used to measure the heat resistance of the material refers to the temperature at which the sample is bent to a certain extent under load. The flake talc powder can increase the heat distortion temperature of the material in a specific direction.
Among the silicon-containing fillers, talc is the cheapest, which reduces costs.