PS material properties and use
a, mechanical properties: high strength, fatigue resistance, dimensional stability, creep is also small (very little change under high temperature conditions);
b, heat aging resistance: enhanced UL temperature index of 120 ~ 140 ° C (outdoor long-term aging is also very good);
c, solvent resistance: no stress cracking;
d, water stability: easy to decompose in case of water (use caution in high temperature, high humidity environment);
e, electrical performance:
1) Insulation performance: Excellent (wet, high temperature can also maintain stable electrical performance, is an ideal material for the manufacture of electronic and electrical parts);
2), dielectric coefficient: 3.0-3.2;
3), arc resistance: 120 s
f, molding process ability: ordinary equipment injection molding or extrusion. Due to the fast crystallization speed and good fluidity, the mold temperature is also lower than other engineering plastics. When processing thin-walled parts, it only takes a few seconds, and for large parts, it only takes 40-60s.
a, electronic appliances: connectors, switch parts, household appliances, accessories parts, small electric cover or (heat resistance, flame retardancy, electrical insulation, molding processability);
1. Exterior parts: mainly have corners of Geshan, engine heat release hood, etc.;
2, internal components: mainly have endoscope stays, wiper brackets and control system valves;
3, automotive electrical parts: automotive ignition coils and various electrical connectors.
c. Mechanical equipment: belt drive shaft of video tape recorder, computer cover, mercury lamp cover, electric iron cover, baking machine parts and a large number of gears, cams, buttons, electronic watch case, camera parts (with heat resistance, Flame retardant requirements)
1. Amorphous material, low moisture absorption, no need to dry fully, not easy to decompose, but large thermal expansion coefficient, easy to generate internal stress. Good fluidity, can be molded by screw or plunger injection machine.
2. It is advisable to use high material temperature, high mold temperature, low injection pressure and prolonged injection time to reduce internal stress and prevent shrinkage and deformation.
3. Various forms of gates can be used, and the gates are connected with the circular arc of the plastic parts to avoid damage to the plastic parts when the gate is removed. The drafting angle is large and the ejection is uniform. The wall thickness of the plastic parts is uniform, preferably without inserts, such as There are inserts that should be preheated.
The use of PS as a product alone is brittle, and the addition of a small amount of other substances such as butadiene in PS can significantly reduce the brittleness and improve the impact toughness. This plastic is called impact-resistant HIPS, and its mechanical properties are greatly improved. Plastics produce many mechanical parts and components with excellent properties.
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