Plasticizer is also called plasticizer, and any substance that can increase the plasticity of polymer when added to polymer materials is called plasticizer. The use of plasticizer can improve the properties of polymer materials, reduce production costs and improve production efficiency.
Plasticizer is an important chemical product additive. As an auxiliary, it is widely used in plastic products, concrete, putty, cement, gypsum, cosmetics and cleaning agents, especially in PVC plastic products. In order to increase the plasticity and strength of plastics, it is necessary to add phthalate esters, the content of which can sometimes reach 50% of the products.
The main function of plasticizer is to weaken the secondary valence bonds between resin molecules, increase the mobility of resin molecular bonds, reduce the crystallinity of resin molecules, increase the plasticity of resin molecules, make them more flexible and easy to process, and can be legally used for industrial purposes, widely existing in food packaging, cosmetics, medical equipment, and environmental water bodies. Such as plastic wrap, food packaging, toys, etc.
Classification of plasticizers
Plasticizers mainly include aliphatic dibasic esters, phthalates (including phthalates and terephthalic esters), polybenzoate esters, benzoic acid esters, polyol esters, chlorinated hydrocarbons, epoxies, citric acid esters and polyesters. At present, thousands of plasticizers have been developed and produced in the world, among which 300 ~ 400 are widely used, and about100 ~10 are produced in China.
Many medical plastic articles, such as catheters and infusion bags, also contain this substance. There are more than 100 kinds of plasticizer products, which have been used since the late 1920s. Phthalate compounds quickly replaced camphor, which was used as plasticizer at that time and had a strong smell and was volatile.
1935, with the industrial production of PVC, phthalate esters were widely used and gradually became the main body of plasticizer, accounting for about 80% of the total output of plasticizer. This kind of plasticizer has good water and oil resistance. It is a colorless and transparent oily liquid at room temperature, which is insoluble in water and soluble in various organic solvents such as methanol, ethanol and ether.
Above content reference: Baidu Encyclopedia-Plasticizer