Commonly used material is introduced
发布日期：2013-12-05 11:12:14 点击量：6122 信息来源：create
rongkuang electrical appliances used in the manufacture of conversion plug shell material, is the most commonly used PC fireproof material, the following is its features.
PC plastic: (Polycarbonate) English name: Polycarbonate proportion: 1.18 to 1.20 g/cm3 molding shrinkage rate: 0.5 0.8% molding temperature: 230-320 ℃ drying conditions: 110-120 ℃ 8 small under 60 ~ 120 ℃ when the long-term use of material performance high impact strength, good dimensional stability, colorless, transparent, good coloring, electrical insulation, corrosion resistance, good wear resistance, but since the lubricity is poor, has a tendency to stress cracking, high temperature hydrolysis, with other resin intermiscibility is poor.Suitable for making instrument small parts, transparency and impact resistance insulation parts forming performance 1. Amorphous materials, good thermal stability, wide temperature range and molding illiquid.Moisture absorption is small, but is sensitive to water, must be approved by dry processing.Molding shrinkage of small, easy to melt cracking and stress concentration, therefore, should strictly control the molding conditions and plastic pieces must be approved by annealing treatment.2. High melting temperature, high viscosity, more than 200 g of plastic parts, appropriate USES the extension of heating type nozzle.3. The cooling speed, mould gating system based on principles of thick, short, appropriate set cold slug well, gate YiQu, mould heating.4. The temperature is too low will cause the lack of material, plastic parts without luster, high temperature easily overflow edge, blister plastic parts.Die temperature low shrinkage rate, high elongation and impact strength, flexural, compressive strength, tensile strength is low.Mould parts cooling temperature over 120 degrees in slow, easy deformation sticking later 5. Shoulds not be too thick, plastic wall should be uniform, avoid sharp corners and gap
