Nine Most Commonly Seen Additives in Plastics
Reinforcing materials and fillers In many plastics, reinforcing materials and fillers occupy a considerable proportion. In order to improve the strength and rigidity of plastic products or reduce production costs, various fiber materials or inorganic substances are added. The most commonly used reinforcement materials are: glass fiber, asbestos, quartz, carbon black, silicate, calcium carbonate, metal oxides, etc. Coupling agent Coupling agent refers to a class of substances that can improve the interface properties between fillers and polymer materials. Usually there are two functional groups in the molecular structure of the coupling agent: one can chemically react with the polymer matrix or have good compatibility; the other can form chemical bonds with the inorganic filler. For example, silane coupling agent, the general formula of which can be written as RSiX 3 , where R is an active functional group that has affinity and reactivity with polymer molecules, such as vinyl, chl...