┠ETFE日本大金EP-521#164;

品牌：进口 产品规格：齐全 产地：广东东莞市 包装说明： CAS/标准: 运输说明：








Molding shrinkage: 0.1-0.5%
Thickness: 2.0-50.mm
Water absorption (24H):0.1-0.4%
Softening point of thawing degree: 89 C
Thermal deformation temperature: 70 C
Soft PVC
Tube temperature: 140-170 degrees centigrade
Mold temperature: 40-60 degrees centigrade
Drying temperature: 80 centigrade x2h
Ejection pressure: 600-1500kg/cm2
Density: 1.4g/cm3
Molding shrinkage: 0.1-0.5%┠ ETFE 日本大金 EP-521¤
Thickness: 2.0-50.mm
Water absorption (24H):0.1-0.4%
Softening point of thawing degree: 85 C
Thermal deformation temperature: 55 C
material processing
Polyvinyl chloride plastics are different in different forms, and the processing methods are varied, such as pressing, extrusion, injection, coating and so on. PVC resin particle size, fisheye, bulk density, purity, impurity and porosity on processing have influence; it should paste resin viscosity and gelling properties of paste into account.┠ ETFE 日本大金 EP-521¤
Polyvinyl chloride is an amorphous polymer with small shrinkage. Before the powder processing, it should be preheated to eliminate water, enhance the plasticizing effect and prevent bubbles. And PVC is very easy to decompose, especially at high temperature, it is more easily decomposed with steel and copper (200 degrees of decomposition temperature). The forming temperature range is small, and the temperature of the material must be strictly controlled. When using a screw type injection machine and a straight through nozzle, the aperture is suitable for preventing the dead angle of the dead angle. Die casting system should be large, gate section should be large, mould should be cooled, mould temperature is 30-60 degrees, and the temperature of material is 160-190.
Under glass transition temperature (Tg, 80 degrees), polyvinyl chloride is a glassy state. At Tg to viscous temperature (Tf, about 160 degrees), it has high elastic rubber and plasticity, and Tf to thermal decomposition temperature (Td) is viscous flow state. The higher the temperature is, the easier the flow is. When the
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temperature is over Td, PVC decomposes a large amount of hydrogen chloride (HCl), and the material loses chemical stability and physical properties. Therefore, Td is the upper limit temperature of processing. Because of the high intermolecular force, the Tf is very high and even close to the decomposition temperature, so the plasticizer is needed to reduce the Tf. On the other hand, we also need to add stabilizers to improve the Td of PVC to be processed.