What Are The Characteristics Of PVC Materials?

Feature 1: rigid PVC is one of the most widely used plastic materials. PVC material is a non-crystalline material.

Feature 2: PVC materials are often used with stabilizers, lubricants, auxiliary processing agents, color materials, shock absorbers and other additives.

Feature 3: PVC material has non-flammability, high strength, weather resistance and good geometric stability.

Feature 4: PVC has strong resistance to oxidants, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid and is not suitable for contact with aromatic hydrocarbons and chlorinated hydrocarbons.

Characteristic 5: the melting temperature of PVC is a very important process parameter during processing. If this parameter is not correct, the problem of material decomposition will be caused.

Feature 6: the flow characteristics of PVC are quite poor, and its process range is very narrow. In particular, high molecular weight PVC materials are more difficult to process (this material usually needs to be lubricated to improve flow characteristics), so it is usually made of low molecular weight PVC materials.

Characteristic 7: the shrinkage rate of PVC is quite low, generally 0.2-0.6%.

Polyvinyl chloride (PVC), English abbreviation of PVC (Polyvinyl chloride), vinyl chloride monomer (vinyl chloride monomer, VCM) such as peroxide, azo compound initiator; Or under the action of light and heat polymerized by the mechanism of free radical polymerization. Vinyl chloride homopolymer and vinyl chloride copolymer are called vinyl chloride resins.

PVC for amorphous structure of white powder, branched degree is small, relative density 1.4, glass transition temperature of 77 ~ 90 ℃, 170 ℃ or so began to decompose, poor stability to heat and light, in more than 100 ℃ or the sun for a long time, will decompose and produce hydrogen chloride, and further automatic catalytic decomposition, cause discoloration, physical and mechanical properties also fell rapidly, must be added in the practical application of stabilizers in order to improve the stability of heat and light.

The molecular weight of PVC produced by industry is generally within the range of 50,000 ~ 110,000, which has a large polydispersity. The molecular weight increases with the decrease of polymerization temperature. No fixed melting point, 80 ~ 85 ℃ began to soften, 130 ℃ is a viscoelastic state, 160 ~ 180 ℃ began to change for the viscous flow; Good mechanical properties, tensile strength of about 60MPa, impact strength of 5 ~ 10kJ/m2; Excellent dielectric performance.

PVC used to be the world's largest production of universal plastics, the application of a wide range of applications. In building materials, industrial products, daily necessities, plastic flooring, floor tile, artificial leather, pipe, wire and cable, packaging film, bottle, foaming materials, sealing materials, fiber, etc, are widely used.