PVC auxiliary materials mainly include plasticizers, stabilizers, lubricants, fillers and colorants. They play a crucial role in the processing of PVC.
Plasticizers: Inserted between the molecular chains of PVC, they reduce the intermolecular forces, thereby enhancing flexibility and extensibility, making the products softer. They are commonly used in soft PVC products, such as wires, cables, and films.
Stabilizers: Prevent PVC from decomposing due to heat and light during processing or long-term use, inhibit the release of hydrogen chloride (HCl), and avoid material discoloration and brittleness. Common types include lead salts, calcium-zinc, and organic tin compounds, etc.
Lubricants: Classified as internal and external lubricants, they reduce friction resistance during the processing, improve melt flowability, prevent mold sticking, and enhance the surface finish of the products.
Fillers: Such as calcium carbonate and talc, they are mainly used to reduce costs while also increasing hardness, dimensional stability, and compressive strength. Colorants: Provide the desired color to PVC products, meeting the requirements of appearance design, such as titanium dioxide for white products.
Although these additives are added in small quantities, they play a decisive role in the processing performance of PVC and the final product quality.
Would you like me to provide you with a detailed introduction to the trend of replacing environmentally friendly stabilizers in PVC auxiliary materials? It will help you understand the green development direction of the industry.