ACR processing aids in PVC will play what role, ACR processing aids can promote the plasticizing mechanism, only plasticizing uniform good material, in order to produce a good appearance and mechanical properties of PVC products, due to PVC processing aids with the following characteristics, ACR processing aids can make PVC has the function of promoting plasticizing.
The characteristics of ACR processing aids are:
The melting temperature is lower than PVC, and ACR processing aids melt before PVC during processing.
2. Because of its good compatibility with PVC, it can adhere PVC particles after melting during processing, increase internal friction, increase shear torque, generate internal heat, make the temperature distribution in the material uniform, and the degree of plasticization is uniform, thus promoting the uniform plasticization of PVC materials.
3. The processing aid has a large enough molecular weight to increase the melt viscosity (or strength) during the processing, increase the melt pressure, prevent the material from slipping, thereby increasing the shear torque, making the melt and the metal surface Friction heat has increased significantly, and the degree of mixing uniformity and plasticization of PVC mixtures has been promoted.
Nowadays, plastic products are popular, plastic materials are constantly developed and applied, and there is a great demand for plastic processing aids. The development of science and technology has promoted the progress of the industry. ACR series processing aids are commonly used processing aids, with good thermal stability, aging resistance, improve the performance of the material, improve the practicality.
ACR processing aids are prepared by methyl methacrylate grafting polymerization in alkyl acrylate elastomers, with a "core-shell" structure. Its "core" is a kind of low crosslinking acrylic rubber polymer, "shell" is good compatibility with PVC methyl methacrylate polymer. It is widely used in PVC products in China. The main purpose of processing ACR is to improve the processability of PVC. It is usually produced by copolymerization of methyl methacrylate and methacrylate and acrylate. PVC type, but the PVC resin itself on the heat and shear force transfer is not strong, the formation of the melt is not uniform, ACR modifier, can significantly improve the PVC, product surface gloss and other characteristics.
The performance of plastic products is closely related to processing aids, and the development of high technology is of great help to plastic materials, improving their performance and becoming a widely used material. Among them, plastic processing aids have been promoted, and there are more and more types, and the improvement of material properties is more and more convenient.