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Description
Polyvinyl chloride(PVC) is high molecular compounds polymerized by vinyl chloride monomer(VCM) with structural element as CH2-CHCLn,degree of polymerization usually as 590-1500.
Polyvinyl chloride has the outstanding characteristics of abundant raw materials (oil, limestone, coke, salt and natural gas), mature manufacturing process, low price, and wide range of uses.
It has become the second largest general-purpose resin in the world after polyethylene resin. 29% of the world's total synthetic resin consumption. Polyvinyl chloride is easy to process and can be processed by molding, laminating, injection molding, extrusion, calendering, blow molding, etc.
Polyvinyl chloride is flame-retardant (flame retardant value above 40), high chemical resistance (resistant to concentrated hydrochloric acid, 90% sulfuric acid, 60% nitric acid and 20% sodium hydroxide), mechanical strength And the advantages of good electrical insulation. But its heat resistance is poor, with a softening point of 80°C, it starts to decompose and change color at 130°C, and precipitate HCI.
Polyvinyl chloride is widely used in building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, fibers, etc.
Properties
Calcium Carbide process | ||||
Item | SG3 | SG5 | SG7 | SG8 |
K value | 72-71 | 68-66 | 62-60 | 59-55 |
Viscosity, ml/g | 135-127 | 118-107 | 95-87 | 86-73 |
Average polymerization | 1350-1250 | 1100-1000 | 950-850 | 750-650 |
Number of impurity particle≤ | 30 | 30 | 40 | 40 |
Volatiles content %,≤ | 0.40 | 0.40 | 0.40 | 0.40 |
Appearing density g/ml≥ | 0.42 | 0.42 | 0.45 | 0.45 |
Residual after sieve 0.25mm mesh≤ | 2.0 | 2.0 | 2.0 | 2.0 |
0.063mm l≥ | 90 | 90 | 90 | 90 |
Number of grain/400cm2≤ | 40 | 40 | 40 | 40 |
Plasticizer absorbency value of 100g resin | 25 | 19 | 14 | 14 |
Whiteness %,≥ | 74 | 74 | 70 | 70 |
Residual chlore thylene content mg/kg≤ | 5 | 5 | 5 | 5 |
Ethylidene chloride mg/kg≤ | 150 | 150 | 150 | 150 |
Application
Polyvinyl chloride(PVC resin) is widely used in the production of water pipe, chemical pipe, plastic windows and doors, packing film, plastic carpet, plastic ceiling, sanitary fitting, plastic wallpaper etc.
1. SG-3: Films, raincoat, industry packing, artificial leather, hose and shoe-making material, etc.
2. SG-5: Rigid plate, gramophone record, value and welding rod, PVC pipes, PVC windows, doors ,etc.
3. SG-8: Good hardness and high strength, mainly used for tubes and pipes.
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