PVC is polyvinyl chloride, which is one of the largest […]
PVC is polyvinyl chloride, which is one of the largest plastic products in the world. It is cheap and widely used. The polyvinyl chloride resin is white or light yellow powder. It cannot be used alone and must be modified. PVC is a white powder with an amorphous structure, which has a small degree of branching and poor stability to light and heat. Different additives can be added according to different purposes, and polyvinyl chloride plastic can exhibit different physical properties and mechanical properties. A variety of hard, soft and transparent articles can be made by adding an appropriate amount of plasticizer to the polyvinyl chloride resin.PVC resin powder models. The most common one in China is and so on.
Then, what is the difference between each model? The viscosity or K value commonly used in industry indicates the average molecular weight or average degree of polymerization of PVC, that is, the length of the PVC molecular chain, to determine and distinguish the resin grade and the corresponding processing parameters. The molecular weight of the resin is related to the physical and mechanical properties of the article.PVC resin is a non-crystalline linear polymer compound. The higher the relative molecular mass, the higher the viscosity number. The higher the molecular weight, the higher the tensile strength, impact strength and elastic modulus of the product, but the flow of the resin melt. Sex and plasticity decline. The viscosity number is usually used to indicate the molecular weight of the polymer, and the polymer type is classified.
Let's analyze the characteristics of each modelThe first is the type . Compared with the type 5, the production of the type requires a long reaction time, a highpolymerization temperature, a high requirement for the addition of excipients, and a production cost of ton higher than that of the type has high purity, less fisheye, easy to absorb plastic, and has the characteristics of high temperature resistance, insulation, and soft texture of products. It is mainly used to produce soft products such as wire and cable, agricultural film, conveyor belt, and daily plastic products.Furthermore, The three resin production processes are basically the same, and the production equipment is exactly the same. The main differences are in the formulation of the additive, the polymerization temperature, and the reaction pressure.
In terms of reaction temperature and reaction pressure. The SG-8 resin has basically reached the working pressure limit of the polymerization reactor, and the reaction requirements are harsh. The requirements on operation, safety, technology, and personnel quality are more strict, and the resin quality is more difficult to control.In terms of product quality. The main difference between resin is the viscosity number, and the other indexes are not much different. The production risk is greater than that of the resin. The production cost of resin resin is basically the same, it will be slightly higher than Most enterprises say that cost is slightly higher than , but the cost difference between different enterprises is slightly different. Companies that need to switch to other models say that the cost of the is slightly higher than the ton, but companies with dedicated production said that the cost of and is not much different.
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