Essential Compounding Chemicals used with PVC Resin

PVC Resin

Essential Compounding Chemicals used with PVC Resin

The production process of polyvinyl chloride resin is divided into petroleum route (ethylene method) and calcium carbide route (calcium carbide method). The former uses petroleum and chlorine as raw materials, and the latter uses coal and crude salt as raw materials. The commonality of the two processes is the final production of chlorine. Vinyl monomer (VCM) is then polymerized to form polyvinyl chloride (PVC).

At present, the PVC industry in Western Europe, North America, the Middle East and other regions widely uses the ethylene method, while the domestic calcium carbide method has developed rapidly, and the production capacity of the calcium carbide method PVC assembly accounts for about 75% of the total domestic production capacity. Compared with the ethylene method, the calcium carbide method has the advantages of less production input, simple process and lower cost. At the same time, China’ “poor oil and rich coal” energy structure and relatively mature calcium carbide production technology provide low-cost raw materials for the calcium carbide route.

According to the difference of polymerization degree, PVC can be divided into general-purpose resin (divided into eight types of SG-1~SG-8) and special resin. Among them, the scope of application of special resins is closely related to customer needs, and general-purpose resin products can be divided into soft and rigid products.

Among the various types of PVC (the following are the grades of calcium carbide process), the most common in our country is SG-5, and then SG-3, SG-7, SG-8, etc.

The industry commonly used viscosity or K value represents 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 grades and corresponding processing parameters. The molecular weight of the resin is related to the physical and mechanical properties of the product.

Polyvinyl Chloride (PVC) resins are a type of synthetic resin made from the polymerization of vinyl chloride monomers. It is a versatile material known for its durability, weather resistance, and low cost, making it widely used in various industries such as construction, automotive, packaging, and electrical.

The PVC resins market is projected to witness substantial growth during the forecast period. The increasing demand for PVC in the construction industry, particularly for pipes, cables, and profiles, is one of the key drivers of market growth. The growing need for sustainable and energy-efficient buildings is also fueling the demand for PVC-based products.

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