PPS plastic injection molding process:
(1) Injection molding: a general-purpose injection molding machine can be used, and the melt index of the glass fiber reinforced PPS is preferably 50. The injection molding process conditions are: barrel temperature, pure PPS is 280~330 °C, 40% GFPPS is 300-350 °C; nozzle temperature, pure PPS is 305 ° C, 40% GFPPS is 330 ° C; mold temperature is 120-180 ° C; Injection pressure, 50-130MPA.
(2) Extrusion: a vented extruder is used. The process is: the feed section temperature is less than 200 ° C; the cylinder temperature is 300-340 ° C, the joint temperature is 320-340 ° C, and the die temperature is 300-320 ° C.
(3) Molding: suitable for large-scale products, using two compressions, first cooling, then hot pressing. The hot preheating temperature of pure PPS is about 360 °C for 15 min, GFPPS is about 380 °C for 20 min; the molding pressure is 10~30 Mpa, and the mold is cooled to 150 °C.
(4) Spray molding: using suspension spray method and suspension spray and dry powder heat spray mixing method, PPS is sprayed onto the metal surface, and then plasticized and quenched to obtain the coating; PPS coating treatment temperature is 300 ° C Above, keep warm for 30min.
PPS application:
In the various fields of the mechanical industry, when nylon (PA), polyoxymethylene (POM), polyethylene terephthalate (PET) and polysulfone (PSU) are used, the defects cannot meet the technical requirements, and polyimide is used. (PI) Polyetheretherketone (PEEK) and polyamide-imide (PAI) are too expensive, and the choice of PPS should be an ideal engineering plastic.
1. Machinery industry: It is especially used in the machinery industry for component preparation in high humidity and strong corrosion environments. For housing, structural parts, wear parts and sealing materials, such as: pump casing, pump wheel, valve, bearing, bearing bracket, piston ring and gear, pulley, fan, flowmeter components, flange, universal Head, counter, level, etc.
2, electronic appliances: PPS for the electrical and electronic industry can account for 30%, it is suitable for high temperature electrical components with an ambient temperature higher than 200 ° C; can be used to manufacture generators and engines on the point 涮, electric 涮 bracket, starter coil, Shields, blades, etc.; on TV sets, can be used for high voltage housings and sockets, terminals and terminal blocks, etc.; in the electronics industry, manufacturing transformers, chokes and relays, skeletons and housings, integrated circuit carriers; Performance, manufacturing H-stage bobbins and trimmer capacitors. Miniature electronic components package, connector, connector, socket, coil bobbin, motor housing, electromagnetic adjustment disc, TV tuner shaft, relay, trimmer capacitor, fuse holder, tape recorder, magnetic therapy and other components. It is also used in precision instruments: computers, timers, tachometers, copiers, cameras, temperature sensors, and housings and components for various measuring instruments.
3, the automotive industry: PPS for the automotive industry accounts for about 45%, mainly used for automotive functional parts; igniters, heaters, vaporizers, clutches, transmissions, gearboxes, bearing brackets, lampshades, bumpers, fans, exhaust systems And the components of the mirror and the lamp holder. It can replace the metal to make the exhaust cylinder circulation valve and pump impeller, pneumatic signal conditioner and so on.
4, household appliances: hot air cylinders, hair curlers, hair dryers, hair irons, microwave ovens, coffee pots, dryers, electric irons, rice cookers and other protective coatings and parts.
5. Chemical industry: PPS has excellent adhesion and corrosion resistance, and is highly suitable as a lining for chemical equipment.
Fourth, material drying process
Temperature: 100~105°C
Time: 3hr
2, injection molding process
1) Mold temperature: 60-80 ° C
2) barrel temperature: front section: 220~260°C middle section: 290~310°C rear section: 300~320°C
Nozzle: 290~300°C
3) Injection pressure: 60~70Mpa4) Injection speed: medium speed
5) Injection time: According to the size of the part, it is better to fill the mold with the part, and the surface is basically cooled and shaped.
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