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Three kinds of materials used by injection molding processing
by：CSSSLD
2021-01-23
Injection molding processing must use all kinds of plastic particles, plastic type has a lot of, can some injection, and some of the raw material is not suitable for injection molding, plastic injection molding processing factory for everybody below chongda analysis of common injection molding material in 3.
1, polyolefin materials ( PP)
is. One of light plastic, its yield, tensile and compression strength and hardness are better than that of low pressure polyethylene, there are outstanding rigidity, high temperature ( 90℃） Resistance to stress relaxation performance is good, the heat resistant performance is good, can be used in more than 100 ℃, if there is no external force is 150 ℃ and deformation, in addition to the concentrated sulfuric acid, nitric acid, in many medium is stable, low molecular weight fatty hydrocarbon and aromatic hydrocarbons, chlorinated hydrocarbons, for it has the effect that the softening and swelling, almost no water absorption, high frequency performance is not good, easy molding. A general structure parts, a corrosion-resistant chemical equipment and heating electrical insulation parts, widely used in car inner decoration materials.
the molding shrinkage ratio is large, prone to shrinkage, dents, deformation. Mold temperature below 50 ℃ in a lacklustre, easy to produce welding mark, flow mark; More than 90 ℃ when prone to warping and deformation.
2, polyformaldehyde ( POM）
good comprehensive performance. Tensile strength, impact toughness, rigidity, fatigue strength and creep resistance is very high, good dimensional stability, water absorption of small, small friction coefficient, has good resistance to chemicals, performance than nylon. Can be used as bearings, gears, CAM, valves, pipes, nut, pump impeller, chassis, carburetor, dashboard widgets, enclosure, container, bar and aerosols of various generation of copper parts.
thermal stability is poor, easy to burn, long-term exposure in the atmosphere will be aging.
3, polycarbonate, PC）
has a prominent impact toughness and creep properties, has high heat resistance, cold resistance is very good also, brittle temperature da 100 ℃, the flexural tensile strength and nylon, and higher elongation and modulus of elasticity and prominent impact strength. Colorless, transparent, good coloring, heat resistant than the nylon, polyformaldehyde, high creep resistance and good electrical insulation, corrosion resistance, good wear resistance.
low water imbibition, small shrinkage, good dimensional stability. Can be used for all kinds of gear, worm gear, rack, CAM, bearing, spindle, the pulley, transmission chain, nuts, washers, pump impeller, chimney, container, etc. , alkali resistant, ketone and amine, aromatic hydrocarbon. Stress cracking can occur, easy to produce stress concentration ( And the internal stress) The higher requirements of forming conditions. High temperature hydrolysis, and other resin phase fusibility is poor. Poor liquidity, liquidity is sensitive to changes in temperature, cooling speed.
different products need different plastic, in addition to the above three kinds of plastic, there are other: phenolic resin ( PF) , polystyrene class ( ABS) And so on, each kind of plastic its performance is different, so the injection molding processing plants need according to the requirements of the injection products to use, to select the suitable material for injection tooling production.
1, polyolefin materials ( PP)
is. One of light plastic, its yield, tensile and compression strength and hardness are better than that of low pressure polyethylene, there are outstanding rigidity, high temperature ( 90℃） Resistance to stress relaxation performance is good, the heat resistant performance is good, can be used in more than 100 ℃, if there is no external force is 150 ℃ and deformation, in addition to the concentrated sulfuric acid, nitric acid, in many medium is stable, low molecular weight fatty hydrocarbon and aromatic hydrocarbons, chlorinated hydrocarbons, for it has the effect that the softening and swelling, almost no water absorption, high frequency performance is not good, easy molding. A general structure parts, a corrosion-resistant chemical equipment and heating electrical insulation parts, widely used in car inner decoration materials.
the molding shrinkage ratio is large, prone to shrinkage, dents, deformation. Mold temperature below 50 ℃ in a lacklustre, easy to produce welding mark, flow mark; More than 90 ℃ when prone to warping and deformation.
2, polyformaldehyde ( POM）
good comprehensive performance. Tensile strength, impact toughness, rigidity, fatigue strength and creep resistance is very high, good dimensional stability, water absorption of small, small friction coefficient, has good resistance to chemicals, performance than nylon. Can be used as bearings, gears, CAM, valves, pipes, nut, pump impeller, chassis, carburetor, dashboard widgets, enclosure, container, bar and aerosols of various generation of copper parts.
thermal stability is poor, easy to burn, long-term exposure in the atmosphere will be aging.
3, polycarbonate, PC）
has a prominent impact toughness and creep properties, has high heat resistance, cold resistance is very good also, brittle temperature da 100 ℃, the flexural tensile strength and nylon, and higher elongation and modulus of elasticity and prominent impact strength. Colorless, transparent, good coloring, heat resistant than the nylon, polyformaldehyde, high creep resistance and good electrical insulation, corrosion resistance, good wear resistance.
low water imbibition, small shrinkage, good dimensional stability. Can be used for all kinds of gear, worm gear, rack, CAM, bearing, spindle, the pulley, transmission chain, nuts, washers, pump impeller, chimney, container, etc. , alkali resistant, ketone and amine, aromatic hydrocarbon. Stress cracking can occur, easy to produce stress concentration ( And the internal stress) The higher requirements of forming conditions. High temperature hydrolysis, and other resin phase fusibility is poor. Poor liquidity, liquidity is sensitive to changes in temperature, cooling speed.
different products need different plastic, in addition to the above three kinds of plastic, there are other: phenolic resin ( PF) , polystyrene class ( ABS) And so on, each kind of plastic its performance is different, so the injection molding processing plants need according to the requirements of the injection products to use, to select the suitable material for injection tooling production.
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