Explanation

Commonly known as filler, it refers to a class of substances used to reduce the cost of polymer products, improve the mechanical properties of polymer, and endow polymer with new functions. Generally, it can be divided into two categories: inorganic filler and organic filler. Common inorganic filler includes calcium carbonate, talcum powder, mica, kaolin, silicon dioxide, carbon black, etc., while organic filler includes wood powder, cotton linter, wheat straw, etc. Fillers can also be classified into four categories based on their chemical composition: oxides, salts, elemental substances, and organic compounds. Alternatively, fillers can be classified into spherical, amorphous, sheet-like, and fibrous shapes based on their geometric shape. With the development of T adding technology, filler has also undergone great changes. Its main functions have transformation from traditional concepts such as increasing volume and reducing cost to improving the performance of polymer and endowing polymer with new functions, such as graphite, magnetic powder or mica to improve the conductivity, electromagnetism and heat resistance of plastics, aluminum hydroxide and magnesium hydroxide to improve the flame retardancy of polymer, and titanium dioxide to improve the weather resistance of polymer.

Classification