Calcined talcum powder, like ordinary talcum powder, is a white powdery solid that feels greasy when touched by hand. Specifications are divided into 200 mesh, 325 mesh, 500 mesh, 600 mesh, 800 mesh, 1250 mesh, etc. according to fineness. Those below 400 mesh can be processed and pulverized by Raymung mill or high-pressure mill, while those above 500 mesh need to be pulverized by ultra-fine mill or micro-powder mill. So...what are the details of the difference between calcined talcum powder and ordinary talcum powder?
The main difference lies in the difference in whiteness, composition, and viscosity. The calcium carbonate in the calcined talc powder will be reduced a lot. The product process is processed by a series of processes such as mining, crushing, pickling, etc. So the color is not very white.
Talc powder is white or white, fine, no sand powder, hand touch a greasy feeling, odorless, tasteless. The mined talc is directly crushed by Rayon mill or other high-pressure mill to obtain the finished powder, which is directly packaged in woven bags and sold. Talc has excellent physical and chemical properties such as lubricity, anti-sticking, flow aid, fire resistance, etc. Talc powder is widely used..
The application of calcined talcum powder is mainly used as a binder in rubber and plastic resin, especially in foaming products, which can help it to process and form. In processing, whether it is compression molding or extrusion molding, it will shorten the molding time and improve productivity. Calcined talcum powder in the sizing resin can change the physical properties of the product.：Increase tensile strength, impact strength, shear strength, bending strength, hardness, reduce deformation, elongation, pad expansion coefficient, etc. Calcined talcum powder is used to improve the processing properties of rubber and plastic resins such as die pressing, calendering, extrusion and injection, and can replace 10-15% of more expensive rubber compounds to reduce the cost of raw materials.
Calcined talcum powder is also one kind of thermal stability agent, because it contains high fatty acid compounds, in addition to being a lubricant for rubber and plastic products, it can also react with the precipitated HCl, making HCL lose its cracking effect.
The application of calcined talcum powder is mainly used as a binder in rubber and plastic resin, especially in foaming products, which can help it to process and form. In processing, whether it is compression molding or extrusion molding, it will shorten the molding time and improve productivity. Calcined talc improves touch and reduces electrostatic effects. Strong magnesium powder into the compound, can make the product easy to print and finish.
Calcined talcum powder has the function of antioxidant, because it contains aromatic compounds to prevent the bond energy in the polymer from being broken by heat, light or oxygen.
In addition, calcined talcum powder in paint, coating, resistance to exposure, high temperature, under ultraviolet light does not change color, can maintain the original luster and color for a long time, has good acid and alkali corrosion resistance, and good water resistance, stain resistance, aging resistance, wear resistance, steam resistance and chemical stability, and strong flame retardant performance.