What kind of role does ACR processing aid play in PVC? ACR processing aid can promote the plasticizing mechanism. Only plasticized and evenly good materials can produce PVC products with good appearance and mechanical properties. The agent has the following characteristics, and the ACR processing aid can make the PVC have a function of promoting plasticization.
The characteristics of ACR processing aids are:
1. The melting temperature is lower than PVC, and the ACR processing aid is melted before PVC in the processing.
2. Because of its good compatibility with PVC, it can adhere to PVC particles after melting in the process, increase internal friction, increase shear torque, generate internal heat, make the temperature distribution in the material uniform, and the degree of plasticization is uniform. Promotes 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 and making the melt and the metal. The frictional heat of the surface is greatly increased, which promotes the degree of mixing and plasticization of the PVC mixture.
Nowadays, plastic products are popular, plastic materials are continuously developed and applied, and there is a great demand for processing aids for plastics. The development of science and technology has promoted the progress of the industry. ACR series processing aids are commonly used processing aids, which have good thermal stability, aging resistance, improved material properties and improved practicability.
The ACR processing aid is prepared by polymerizing methyl methacrylate onto an alkyl acrylate elastomer and having a "core-shell" structure. Its "core" is a kind of low-crosslinking acrylic rubber polymer, and the "shell" is a methyl methacrylate polymer which is compatible with PVC. It is widely used in PVC products in China. The processing type ACR is mainly used to improve the processing property of PVC. It is usually formed by copolymerization of methyl methacrylate with methacrylate and acrylate. PVC type, but the PVC resin itself does not transmit heat and shear force, and the formed melt is not uniform. After the ACR modifier, the characteristics of PVC and surface gloss can be obviously improved.
The performance of plastic products has a great connection with processing aids. The development of high-tech has greatly improved the plastic materials and improved its performance. It has become a widely used material. Among them, plastic processing aids have been promoted, and more and more types, and the improvement of material properties is more and more convenient.