Explanation

Also called plasticizer. It refers to the liquid organic compound or low melting point solid added to the polymer system to improve its processability, flexibility or expansibility. Its main role is to weaken the secondary bond (i.e. Van der Waals force) between polymer molecules, thus increasing the mobility of polymer molecular chain and reducing the crystallinity of polymer molecular chain. That is, it increases the plasticity of polymer, which is mainly manifested in the decrease of hardness, modulus, conversion temperature and embrittlement temperature of polymer, And the improvement of elongation, flexibility, and flexibility. Ideally, it should be evenly dispersed in polymer materials, can exist stably for a long time, and has no adverse effect on the physical and mechanical properties of polymer. According to the compatibility with resin, it can be divided into primary and secondary. The primary and resin have good compatibility. Generally, the dosage is large, and can be used alone; The compatibility between auxiliary and resin is relatively poor. Generally, the amount of auxiliary is small, and it cannot be used alone. It needs to cooperate with the appropriate main to increase its compatibility. According to the chemical structure, it can be divided into phthalic acid ester plasticizer, aliphatic carboxylic acid ester, phosphoric acid ester, polymer type, benzene poly acid ester, halogen containing, sulfonic acid derivatives, polyols, etc. It is mainly used in polyvinyl chloride (PVC), especially soft PVC, and also in cellulose, ABS (acrylonitrile butadiene styrene) plastics, rubber, coatings and adhesive.

Classification