What pvc additives
2013-09-12 by seoer8
PVC (polyvinyl chloride) chemical and physical properties of rigid PVC is the most widely used plastic materials. PVC material is a non-crystalline materials. PVC material in actual use, often by adding stabilizers, lubricants, auxiliary processing agents, pigments, impact and other pvc additive .
PVC is PVC, bright color, corrosion-resistant, durable, due to the increase of the manufacturing process plasticizers, anti-aging agent of some toxic auxiliary materials, so its products are generally not stored food and medicine.
In fact, PVC is a vinyl polymeric materials.
Briefly, an aqueous solution of a salt of the current role of chemical decomposition. This process will produce chlorine, caustic soda and hydrogen. Refining, cracking petroleum or gasoline to produce ethylene. When a mixture of chlorine and ethylene, it will produce chloride; vinylidene chloride and vinyl chloride can be converted to produce, which is an essential part of polyvinyl chloride. Vinyl chloride polymerization process molecules connected together to form a PVC chain. Polyvinyl chloride generated in this way as a white powder. It can not be used alone, but can be mixed with other ingredients to generate a lot of products.
PVC has abundant raw materials (petroleum, limestone, coke, salt and natural gas), manufacturing processes mature, inexpensive, versatile, and other prominent features, has now become the world's second largest after the polyethylene resin universal resin, accounting World of synthetic resin for 29% of total consumption. PVC is easy to process, can be molded, laminated, injection molding, extrusion, calendering, blow, etc. for processing. PVC is mainly used for production of artificial leather, film, wire sheathing and other plastic soft products, also produces lumber, doors, windows, pipes and valves and other plastic hardware products.
A flame retardant PVC (flame retardant is more than 40), high chemical resistance (resistance to concentrated hydrochloric acid concentration of 90% sulfuric acid concentration of 60% nitric acid and 20% concentration of sodium hydroxide), the mechanical strength and advantages of good electrical insulation. But its poor heat resistance, a softening point of 80 ℃, begin to decompose at 130 ℃ discoloration.