What specifications do you have for PVC electric tape?
The first is the PVC of type 3. Compared with type 5, the production of type 3 PVC requires long reaction time and high polymerization temperature, and requires high added material. The production cost is 50-100 yuan / ton higher than that of type 5. 3 type PVC high purity, small fish eye, easy to blister, with high temperature resistance, insulation, soft products and other characteristics, mainly for the production of soft products, such as wire and cable, agricultural films, conveyor belts, plastic products for daily use.Again, the SG-7/SG-8 and SG-5 PVC. The three resins are basically the same process and the production unit is the same. The main difference lies in additives, formula, polymerization temperature, reaction pressure and so on.In terms of reaction temperature and reaction pressure. SG-8 resin has basically reached the limit pressure of polymerization reactor, reaction conditions more stringent requirements, the operation, safety, technology, personnel quality and other aspects of the requirements, and it is more difficult to control the quality of resin.
In terms of product quality. The main difference between SG-8 and SG-7 resin is in viscosity number. Other indexes have little difference. In production, the risk coefficient of SG-7 resin is greater than that of resin. The production cost is basically the same as the SG-8 resin, SG-7 resin, which is slightly higher than the SG-7 type. Most enterprises indicate that the cost of SG-8 is slightly higher than that of SG-5, but there is a slight difference in the cost spread between the different enterprises. Need to and other types of enterprises, the cost is slightly higher than SG-8 type SG-5 type between 100-150 yuan / ton, but the line production enterprises said SG-8 and SG-5 costs less.
PVC resin powder, by model. In our country, the most common is SG-5, then SG-3, SG-7, SG-8 and so on. So what is the distinction between various types, commonly used in industry or the viscosity value of K indicates the average molecular weight of PVC (or the average degree of polymerization), is the length of the molecular chain of PVC, to determine and distinguish between resin grades and corresponding processing parameters. The molecular weight of the resin is related to the physical and mechanical properties of the product.PVC resin is a non crystalline linear polymer, its molecular weight is bigger, the viscosity of the higher molecular weight, tensile strength, impact strength and elastic modulus of products is higher, but the fluidity and plasticity of the resin melt down. The molecular number of polymers is usually expressed in terms of viscosity, and the type of polymer is divided. Here we will analyze the characteristics of each model:
PVC is polyvinyl chloride, it is one of the largest plastic products in the world. It is cheap and widely used. PVC resin is white or light yellow powder. It can not be used alone. It must be modified. PVC is an amorphous white powder with poor branching degree and poor stability to light and heat. Different additives can be added according to different uses, and polyvinyl chloride plastics can exhibit different physical and mechanical properties. A variety of hard, soft and transparent products can be made by adding proper amount of plasticizer in PVC resin.
