What are the main raw materials used in plastic products?
PS plastic (polystyrene) English Name: PolystyreneSpecific gravity: 1.05 g / cubic centimeter molding shrinkage: 0.6-0.8% molding temperature: 170-250 DEG C drying conditions: ---The material properties of electrical insulation (especially high-frequency insulation) excellent, colorless and transparent, light transmittance after organic glass, color of water resistance, good chemical stability and strength. In general, but the crisp, easy to produce stress cracking, no resistance to benzene. Gasoline and other organic solvents. Suitable for making insulating transparent ornament and. Chemical equipment. Optical instruments and other parts.Molding performance 1. amorphous material, moisture absorption is small, not to be fully dry, not easy to break down, but the coefficient of thermal expansion is large, easy to produce internal stress. Better liquidity, can be used screw or plunger injection molding machine2., should use high material temperature, high mold temperature, low injection pressure, extended injection time, is conducive to reducing internal stress, prevent shrinkage, deformation3., can be used in various forms of gate, gate and plastic parts arc connection, so as not to go to the gate when damaged plastic parts. Stripping large slope, top out even. Plastic parts wall thickness uniform, preferably without insert, if inserts should be preheated
Molding performance 1. amorphous material, medium mobility, moisture absorption, must be fully dry, surface requirements of the plastic parts must be prolonged preheating, drying 80-90 degrees, 3 hours2., should take high material temperature, high mold temperature, but the material temperature is too high, easy to decompose (decomposition temperature is >270 degrees). For the higher precision plastic parts, mold temperature should take 50-60 degrees, for high gloss, heat-resistant plastic parts, mold temperature should take 60-80 degrees3, to solve the water to increase the liquidity of the clip, material, high temperature, high modulus to temperature, or change into the water level method.4, such as forming heat-resistant or flame retardant materials, the production of 3-7 days later, the mold surface will remain plastic decomposition, leading to the surface of the mold shining, the need to clean the mold in a timely manner, while the mold surface to increase the exhaust position.
ABS plastic (acrylonitrile butadiene styrene) English Name: AcrylonitrileButadiene StyreneSpecific gravity: 1.05 g / cubic centimeter molding shrinkage: 0.4-0.7% molding temperature: 200-240 DEG C, drying conditions: 80-90 hours, 2 hoursThe material performance is 1, the comprehensive performance is better, the impact strength is higher, the chemical stability and the electrical performance are good. It is suitable for making general mechanical parts, reducing wear and wear parts, transmission parts and telecommunications parts2, and 372 organic glass welding good, made of two color plastic parts, and surface chromium plating, spray paint processing3, high impact, high heat resistance, flame retardant, enhanced, transparent and so on.4, liquidity is a little worse than HIPS, better than PMMA, PC and so on, good flexibility.
