Is The Market Prospect Of PVC Sheet Good?

PVC is PVC, it is one of the largest plastic products production in the world, cheap, wide application, polyvinyl chloride (PVC) resin as white or light yellow powder, alone can't use, must be modified. PVC is an amorphous white powder with small branched degree and poor stability to light and heat. Different additives can be added according to different USES and different physical and mechanical properties of polyvinyl chloride plastics can be presented. A variety of hard, soft and transparent products can be made by adding a suitable amount of plasticizer to polyvinyl chloride resin.

PVC resin powder models. The most common ones in China are sg-5, followed by sg-3, sg-7, sg-8, etc. Each model is depend on what distinction, industry commonly used viscosity and K value indicates that the average molecular weight of PVC (or the average degree of polymerization), namely PVC molecular chain length, to determine the brand and distinguish between resin and corresponding processing parameters. The molecular weight of resin is related to the physical and mechanical properties of products.

PVC resin is a kind of amorphous linear polymer compound, its relative molecular mass is larger, the higher the viscosity number, the higher the molecular weight of products of the tensile strength, impact strength, elastic modulus is higher, but the resin melt liquidity and plasticity. The viscosity is usually used to represent the molecular weight of the polymer and to classify the polymer model. Now let's analyze the characteristics of each model:

The first one is type 3 PVC. Compared with the type 5, the production of type 3 PVC requires long reaction time, high polymerization temperature, high requirements for the addition of auxiliary materials, and the production cost is 50-100 yuan/ton higher than that of type 5. 3 type PVC higher purity, less fisheye, blister easily, high temperature resistance, insulation and product quality of a material soft, mainly for the production of soft products such as wire and cable, agricultural film, conveyor belt, daily plastic products, etc.

The second is sg-7 / sg-8 and sg-5 PVC. These three resins are produced in the same process and the production equipment is exactly the same. The main difference lies in the formulation of additives, polymerization reaction temperature, reaction pressure and other aspects.

In terms of reaction temperature and reaction pressure. SG - 8 resin has been basically achieve the polymerizer working pressure limit, reaction conditions are demanding, for operation, safety, technology and personnel quality, etc, more strict, and the resin quality more difficult to control.

In terms of product quality. The main difference between SG-8 and SG-7 resins is the viscosity, other indexes are not different, and the risk factor of SG-7 resins is greater in production than that of SG-7 resins. The production cost of sg-8 resin sg-7 is basically the same as that of sg-7 resin, which is slightly higher than that of sg-7 resin. Most enterprises say that sg-8 cost is slightly higher than sg-5, but the cost difference between different enterprises is slightly different. The cost of the sg-8 is slightly higher than that of the sg-5 model 100-150, according to companies that need to convert to other models

The cost of SG-8 is not much different from that of SG-5.

PVC has a wide range of applications and different models are adopted due to different requirements. For example: SG5 (K - 65, S1000) is applied to, and so on tubing, molding, plate and SG3, S1300 (K - 70) is the soft goods that applied to manufacture more hose, wire and cable, film, shoes, toys, auto parts. SG7, SG8 (k-60, S800, S700) are mostly used for manufacturing pipe fittings, sheet materials, containers, etc. In principle, the higher the model, the harder the product.