Advantages of PVC
PVC has a series of unique functions, such as non-flammability, high strength, climate change resistance, and excellent stability. Because of the introduction of chlorine atoms in the polymer main chain, it has received widespread attention and become a composition material with good prospects.
Despite the outstanding function of PVC resin, there are also some shortcomings, mainly in: poor thermal stability, the melting temperature of PVC is about 210 ℃.when the material temperature is higher than 150 ℃, pvc resin can be rapidly decomposed. therefore, PVC processing should deal with its thermal stability firstly; Secondly, a small amount of plasticizers is added to the rigid PVC, the apparent viscosity of the melt is high, liquidity. Additionally, hard PVC without or with a small amount of plasticizers has a high apparent viscosity and high fluidity, which makes plastic extrusion processing more difficult; and soft PVC with small molecules of plasticizers used because small molecules dissolve, volatilize and relocate, making the products hard and brittle and losing their value, and also causing pollution to the environment. The above-mentioned problems greatly affect the processing and use of PVC.
How to improve its defects
Therefore, it is important to modify PVC by changing the polymerization method, copolymerization modification, and other technical means to improve the thermal stability or give new functions to improve the processable function of PVC; in addition, in view of the use of PVC and the functional requirements of plastic products, the PVC processing process and equipment optimization and improvement, the best production process, to get the best cost-effective products, and further expand the use of PVC scale, to meet the special requirements of various PVC profile products on the function of the material, is the current hot spot of PVC material research is also the focus.