Production experience of PVC cable material

Polyvinyl chloride cable material, as a traditional cable material in China, still holds the most important market share in the domestic enterprise market. Due to its relatively simple processing and large usage compared to other cable materials, PVC cable materials produced by cable factories themselves are sufficient.

Selection of resin and common issues

From a process perspective, comprehensive consideration can be given to the performance research of PVC resin materials using the bulk method, which is superior to other suspension methods. The monomer content is less than 1mg/kg, and the particle size distribution is concentrated. Design management rules for configuration, with high and uniform porosity. Adsorption capacity as a plasticizer has a large amount and fast speed, and the resin after plasticization can be analyzed. Like the development of dry powder enterprises, it is easy to achieve information storage and transportation. Adding a relatively small amount of plasticizer can also improve the plasticity required for business development. The product has good transparency, thermal stability, and electrical insulation. However, due to its high price, it is difficult for cable manufacturers to accept it. Sg3 suspended polyvinyl chloride resin is widely used in the production of PVC cable materials. It has the advantages of high mechanical performance, electrical insulation, low water absorption, low permeability, and resistance to general chemical corrosion. However, for us to choose SG3 suspension method universal PVC resin as the base material for PVC cable materials, a certain problem is that enterprises need to study the "fish eye" number, which is an important national factor indicator data. It is very important for students to pay attention and not affect more than 20/10000px2, otherwise the cross-section of the cable material made from the cable material will have such a dense porosity.

Selection of plasticizers and how to solve the problem of "cable oil leakage"

Any material culture that can increase the plasticity of some polymers for students and make them easier for production enterprises to process can be called plasticizers. The purpose of adding plasticizers is to modify polymers, and adding a small amount of plasticizers can significantly improve the plasticity and flowability of polymers. Plasticization can be divided into two categories: external plasticization and internal plasticization. Introducing low molecular weight esters or polymer esters (plasticizers) between polymer molecular chains to soften rigid polymer molecules and facilitate the movement of molecular chains, this type of plasticizer is called an external plasticizer.

But as plasticizers, we must have good compatibility with polymers, and after analyzing and mixing the two, a system with good stability can be used. If the compatibility is poor, plasticizers in the product can easily seep out onto the surface of the product (usually referred to as sweating or oil leakage) and cause phase separation, which will affect the molding process and product performance. Therefore, biocompatible plasticizers cannot be used as the main plasticizers, and based on the characteristics of secondary applications, we can use them as auxiliary plasticizers.