PVC (polyvinyl chloride) chemical and physical properties Rigid PVC is one of the most widely used plastic materials. PVC material is a non-crystalline material. PVC materials in the actual use of often added stabilizers, PVC Plastic Bags lubricants, auxiliary processing agents, colorants, PVC Plastic Bags impact agents and other additives.
PVC material with non-flammable, high strength, weather resistance and excellent geometric stability. PVC has a strong resistance to oxidants, reducing agents and strong acids. PVC Plastic Bags However, it can be concentrated oxide acid such as concentrated sulfuric acid, PVC Plastic Bags concentrated nitric acid corrosion and does not apply with aromatic hydrocarbons, chlorinated hydrocarbons in contact with the occasion.
PVC melting temperature during processing is a very important process parameters, if this parameter will lead to improper decomposition of the material. PVC flow characteristics are quite poor, PVC Plastic Bags the process range is very narrow. In particular, large molecular weight PVC materials are more difficult to process (this material is usually added to improve the flow characteristics of lubricants), PVC Plastic Bags so are usually used are small molecular weight PVC material. PVC shrinkage is quite low, generally 0.2 to 0.6%.
PVC can be divided into soft PVC and hard PVC. Which accounted for about 2/3 of the hard PVC market, soft PVC accounted for 1/3 Soft PVC is generally used for flooring, ceilings and leather surface, but because soft PVC contains softener (which is the difference between soft PVC and hard PVC), easy to become brittle, easy to save, so its use has been limited. Hard PVC does not contain softener, so flexible, easy to shape, not brittle, non-toxic and pollution-free, long storage time, so it has great development and application value. Hereinafter referred to as PVC. The essence of PVC is a vacuum plastic film, used for all kinds of panel surface packaging, it is also known as decorative film, with film, used in building materials, packaging, medicine and many other industries. PVC Plastic Bags Which accounted for the largest proportion of building materials industry, 60%, followed by the packaging industry, there are several other small-scale application of the industry.
Polyvinyl chloride combustion characteristics, PVC Plastic Bags flame retardant, from the fire that is off, the flame was yellow, white smoke, burning green when the plastic issued a stimulating taste of chlorine.
Polyvinyl chloride resin is a multi-component plastic, PVC Plastic Bags according to different uses can be added to different additives, so with the composition of different products can show different physical and mechanical properties, such as adding or without adding plasticizer can make it There are hard and soft products of the points. In general, PVC products are resistant to chemical stability, flame self-extinguishing, wear, PVC Plastic Bags muffler shock, high strength, good electrical insulation, low cost and wide material source, good air tightness and so on. The disadvantage is poor thermal stability, by the light, heat, oxygen, easy to aging. PVC Plastic Bags Polyvinyl chloride resin itself is non-toxic, if the use of non-toxic plasticizers, stabilizers and other auxiliary materials made of products, harmless to humans and animals. However, generally seen in the market of PVC products used plasticizers, stabilizers are mostly toxic, so in addition to marked non-toxic formula products, PVC Plastic Bags can not be used to dress food.
The electrical properties of PVC depend on the amount of residue in the polymer, the type and amount of the various additives in the formulation. PVC Plastic Bags The electrical properties of PVC are also related to the heat conditions: when heating to make PVC decomposition, due to the presence of chloride ions to reduce its electrical insulation, if a large number of chloride ions can not be alkaline stabilizers (such as lead salt) It will lead to its electrical insulation performance decreased significantly. PVC is not like polyethylene, polypropylene, such non-polar polymer, PVC Plastic Bags its electrical properties vary with frequency and temperature, PVC Plastic Bags such as dielectric constant decreases with increasing frequency.