Performance Of Calcium Carbide And Ethylene Based PVC Material

1.Different molecular weights and molecular weight distributions.

 

The number average and weight average molecular weight, as well as the number average and weight average polymerization degree, of PVC resin produced by calcium carbide method are lower than those produced by ethylene method; The molecular weight distribution of PVC resin produced by calcium carbide method is wider than that of PVC resin produced by ethylene method. The difference in molecular weight and distribution of PVC resin between carbide method and ethylene method will result in significant differences in rheological and mechanical properties.

 

The processing and product performance of PVC materials not only depend on the average molecular weight, but also closely related to the molecular weight distribution of PVC. Generally speaking, PVC resin with a narrow molecular weight distribution has good molding and processing performance. This is not only because it needs to maintain uniformity in processing and product properties, but also because abnormal structures such as double bonds are mostly concentrated in low molecular weight fractions. A wide molecular weight distribution will significantly reduce its thermal stability, heat-resistant deformation temperature, electrical insulation, mechanical strength, and aging resistance; In addition, it can also make PVC resin difficult to plasticize uniformly under normal processing conditions, resulting in serious internal quality problems in the product. Therefore, in the actual production process of PVC resin, the molecular weight and distribution of the resin should be strictly controlled.

 

 

2.Different rheological properties.

 

Compared with ethylene based PVC dry mix, calcium carbide based PVC dry mix has a higher plasticizing torque, shorter plasticizing time, and lower equilibrium torque, indicating that the plasticizing performance of calcium carbide based PVC resin is better than that of ethylene based PVC resin. This is because the molecular weight of PVC resin produced by calcium carbide method is smaller than that of PVC resin produced by ethylene method, and its molecular weight distribution is also wider than that of PVC resin produced by ethylene method.

 

 

3.Different mechanical properties.

 

The difference in mechanical properties between PVC samples produced by calcium carbide method and those produced by ethylene method mainly lies in the elongation at break. Due to the high degree of polymerization and molecular weight of ethylene based PVC resin, the fracture elongation of its samples is relatively high.

 

4.In conclusion.

 

(1) The molecular weight of PVC resin produced by calcium carbide method is lower than that of PVC resin produced by ethylene method, and its molecular weight distribution is wider than that of PVC resin produced by ethylene method.

 

(2) The plasticizing performance of PVC dry mix produced by calcium carbide method is superior to that of PVC dry mix produced by ethylene method.

 

(3) The mechanical properties of PVC resin produced by calcium carbide method and ethylene method are not significantly different.

 

About Us

 

Luoyang Dema Import & Export Co., Ltd. aims to provide high-quality, cost-effective products for global factories, plastic product manufacturers, and material distributors. Luoyang Dema Import & Export Co., Ltd. provides the best PP, PE, PVC, PET, EVA, ABS, and POM material solutions for plastic product manufacturers, wholesalers, distributors, distributors, factory owners, processing workshops, etc.

If you are looking for general plastic materials, please feel free to get the latest prices and quotations from Luoyang Dema Import & Export Co., Ltd. The sales team will reply within 48 hours.