Environment-friendly plasticizer refers to the plasticizer that increases the plastic, improves the fluidity of the resin during the molding process, and makes the product flexible organic substance. It is usually some high-boiling, difficult-to-volatile viscous liquid or low-melting solid, and generally does not react chemically with plastics.
Eco-plasticizer must first have good compatibility with resin. The better the compatibility, the better its plasticizing effect. Adding plasticizers can lower the glass transition temperature of plastics, making hard and rigid plastics soft and flexible. Generally, environmentally friendly plasticizers are also required to be colorless, non-toxic, odorless, light-resistant, heat-resistant, cold-resistant, low in volatility and mobility, non-combustible and chemically stable, and cheap and easily available. In fact, only environmentally friendly plasticizers, general general-purpose plasticizers cannot meet all the above requirements.
Environmental plasticizers are divided into main plasticizers, that is, solvent-based plasticizers; auxiliary plasticizers, that is, non-solvent plasticizers; catalyst-type plasticizers; phthalate esters according to their chemical structure Types, fatty acid esters, phosphate esters, polyesters, epoxy esters, chlorine-containing compounds, etc. Commonly used plasticizers are dibutyl phthalate (DBP), dioctyl phthalate (DOP), epoxy soybean oil, tricresyl phosphate, triphenyl phosphate, dioctyl sebacate, Chlorinated paraffin, etc. PVC is the main end user of these plasticizers. The main application fields with the addition of plasticizer PVC are wires, cables, floor and wall coverings, building materials, automobiles and packaging materials.
Environmental plasticizers are the most used among all plastic additives. China's total production capacity is about 1 million tons. The plasticizers are mainly phthalates with good comprehensive performance and excellent prices. The consumption of the world's four major production and consumption countries and regions-the United States, Western Europe, Japan and China 70% to 90%.
The controversy of environmentally friendly plasticizers is caused by plastic wrap. In fact, in addition to being a plastic wrap, PVC products are widely used in fields related to human medical treatment and life. Plasma bag, part of blood transfusion, infusion, respiratory equipment, children's toys, artificial leather (used as clothing, shoe materials, handbags, sofa fabrics, etc.). At present, there are strict regulations or corresponding recommendations for plasticizers and other additives used in these products abroad. In China, most of the plasticizers used in the production of these products are still DEHA, DOP, DEHP, DINP, etc. Traditional type of plasticizer. Many animal experiments at home and abroad have shown that these plasticizers are harmful to organisms, but some experts pointed out that many of these experiments were only completed under specific conditions. The possibility of harm to the human body under the rules of use is minimal.
The role of environmental plasticizers:
① Reduce the viscosity of the melt
② Increase the flexibility of the polymer
③ Increase the breaking elongation of polymer
④ Reduce the molding temperature of polymer
⑤Improve the molding characteristics of polymers
⑥Improve the impact performance of polymer
⑦Improve the low temperature flexibility of polymer
⑧Reduce the surface hardness of polymer
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