The PVC foam board is made of pvc, and the PE board is […]
The PVC foam board is made of pvc, and the PE board is made of pe. Now we come to understand the difference between pvc and pe.
Pvc is light yellow translucent with natural color and luster. The transparency is better than pe and polystyrene. According to the different amount of additives, it can be divided into soft pvc and hard pvc. The soft product is soft and tough, and feels sticky. Hard products have higher hardness than low-density pe, but lower hardness than polypropylene, and whitening occurs at the buckling point.
One characteristic of pvc board is flame retardant, so it is widely used in fire fighting applications. But PVC will release HCL and other toxic gases, such as dioxins, etc. during the combustion process.
The combustion of pvc is divided into two steps. First, HCL gas and double bond-containing diene are combusted at 240-340, and then carbon combustion occurs at 400-470.
The physical and chemical properties are stable. It is not easy to be corroded by acid and alkali. Relatively heat resistant.
The pvc board has the advantages of flame retardant (flame retardant value above 40), high chemical resistance (concentrated hcl, 90% sulfuric acid, 60% nitric acid), good mechanical strength, and good electrical insulation. However, its heat resistance is poor, with a soft point of 80 and 130 starting to change color and precipitate HCI.
Industrial PVC board resin is mainly amorphous structure, but also contains some crystalline regions (about 5%), so PVC has no obvious melting point, starting at around 80. The heat distortion temperature (under a load of 1.82MPa) is 70-71, and 150 starts to flow under pressure, slowly releasing HCL, and discoloring pvc (from yellow to red, brown or even black). The weight average molecular weight of industrial pvc is 4.8 Within the range of -48,000, the corresponding number average molecular weight is 2-19.5 million. Most industrial resins have a weight average molecular weight of 100,000 to 200,000, and a number average molecular weight of 45,500 to 64,000. Rigid pvc (without plasticizer) has good mechanical strength, weather resistance and flame retardancy, and can be used as a structural material alone, and can be used to manufacture pipes, plates and injection molded products in the chemical industry. Hard pvc can be reinforced.
Pe is a thermoplastic resin polymerized by ethylene.
pe is odorless, feels like wax, has excellent low temperature resistance (low temperature can reach -70~-100), good chemical stability, resistance to most acids and alkalis (acid resistance and oxidation resistance), insoluble at room temperature Common solvents have low water absorption and excellent electrical insulation properties. However, pe has environmental stress (chemical and mechanical effects) and has poor heat aging resistance.
The performance of pe varies from species to species, and mainly depends on molecular structure and density. After reading the above content, if you have any other questions about pvc board products, please contact us. We look forward to reaching cooperation with you.