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by:CSSSLD     2021-01-23
Polyvinyl chloride (PVC) is one of the largest varieties of plastic production in the world. The price cheap, widely used. PVC resin is white or light yellow powder. According to the different USES can join different additives, PVC plastic parts can present different physical properties and mechanical properties. Add the right amount of plasticizer in PVC resin, can be made into a variety of hard, soft and transparent injection molding processing products. Hard polyvinyl chloride (PVC) has good tensile, flexural, compressive strength and impact performance, can be used as structural materials separately.

polyethylene plastic is one of the largest varieties of production in the plastics industry. According to the aggregation when using different can be divided into high, medium pressure and low pressure. Low pressure polyethylene molecular chain branched chain is less, the relative molecular mass, crystallinity and density is higher, so low pressure polyethylene is hard, wear resistance, wear resistance, corrosion resistance, good heat resistance and insulation. High pressure polyethylene molecules with many branched chain, and relative molecular mass is lesser, crystallinity and density is low, and has good flexibility, impact resistance and transparency.

polypropylene temperature can reach the use of low temperature resistant 15 ℃ and below - 35 ℃ when embrittlement. Polypropylene high frequency by good insulation and, since they don't water absorption, insulation performance is not affected by humidity. Polypropylene under the action of oxygen, heat, light, easy to depolymerization, aging, so must add age resister. Polypropylene molding shrinkage range is big, prone to deformation, shrinkage cavity, dent and polypropylene thermal capacity is big, plastic injection molding mold must be designed to fully for the cooling of the cooling circuit, suitable mode of polypropylene molding temperature is 80 ℃ or so, not less than 50 ℃, otherwise it will cause poor molding plastic parts surface gloss or produce the defects such as weld mark, and the temperature is too high will produce warping phenomenon.

polyethylene non-toxic, tasteless, white, crystalline plastics. Polyethylene has certain mechanical strength, but compared with other plastic its low mechanical strength, surface hardness. Polyethylene polyethylene insulation performance, room temperature does not dissolve in any solvent a known, and resistant to dilute sulfuric acid, concentration of dilute nitric acid and any other acid and various concentration of alkali and salt solution. Yo polyethylene high water resistance, long-term contact with water its performance can remain the same.

polyethylene under the action of heat, light, oxygen aging and brittle. Generally the use of high pressure polyethylene temperature about 80 ℃, the low pressure polyethylene is about 100 ℃. Polyethylene can hardy, in - At 60 ℃ still has good mechanical properties, - 70 ℃ still has certain flexibility. Polyethylene molding, the contraction of the differences in flow direction and vertical direction is bigger. The shrinkage rate is greater than the vertical direction in the direction of injection shrinkage rate. Are easy to produce deformation and gate around the plastic parts of the brittleness increases. Polyethylene shrinkage rate of absolute value is larger, molding shrinkage is bigger also, prone to shrinkage cavity, cooling speed slow, must fully cooling, and cooling speed wants even, soft, easy mold release, plastics have shallow lateral concave can be forced demoulding.

specific volume and compression ratio mainly for thermosetting plastics, specific volume refers to the unit mass of loose plastic occupied volume. Compression ratio refers to the ratio of the volume and the volume of injection molding processing of plastics, its value is constant is greater than 1. Specific volume and compression ratio are said powder and fibrous plastic loose, while thermosetting plastic compression or injection molding, use them to determine the size of the mould material room. Specific volume and the compression is larger, the gas inside the plastic, exhaust time molding difficult, longer molding cycle, reduce production efficiency. Specific volume and the compression is small, compression and betting easier. But the volume is too small, the effect of plastic loose, with volume plastic parts quality caused by inaccurate when charging.

polypropylene odorless, colorless, non-toxic. Look like polyethylene, but more transparent, lighter than polyethylene. It is not bibulous, good gloss, easy coloring. Polypropylene of yield strength, tensile strength, compressive strength and hardness and elasticity than polyethylene. Directional stretch polypropylene can be made after the hinge, it has high resistance to bending fatigue strength. The melting point of polypropylene is 164 - 170 ℃, its heat resistance is good, can at above 100 ℃ temperature disinfection sterilization.

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