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general purpose polystyrene;GPPS (general purpose polystyrene;GPPS)

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general purpose polystyrene;GPPS

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general purpose polystyrene
GPPS

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Nature Description

Universal grade polystyrene is a thermoplastic resin, which is shiny, transparent beaded or grained solid. Density 1.04~1.09, transparency 88%~ 92%, refractive index 1.59~1.60. Under the action of stress, birefringence is generated, which is called stress-optical effect. The melting temperature of the product is 150 ~ 180℃, the thermal decomposition temperature is 300℃, the thermal deformation temperature is 70 ~ 100℃, and the long-term use temperature is 60 ~ 80℃. Under 5 ~ 6℃ lower than the thermal deformation temperature, after annealing treatment, the stress can be eliminated and the thermal deformation temperature can be increased. If a little α-methylstyrene is added in the production process, the heat resistance grade of general polystyrene can be improved.

Product Applications

a. Electronic appliances: Connectors, switch parts, household appliances, accessories components, small electric cover or (heat resistance, flame retardant, electrical insulation, molding and processing);

b. Cars:

1. External parts: mainly include corner gshan, engine heat release aperture mask, etc;

2. Internal parts: mainly include endoscope brace, wiper blade bracket and control system valve;

3. Automotive electrical parts: automobile ignition coil twisted tube and various electrical connectors, etc.

c. Mechanical equipment: belt drive shaft of video tape recorder, electronic computer cover, Mercury lampshade, electric iron cover, roaster parts and a large number of gears, Cam, Button, electronic watch shell, camera parts (with heat resistance and flame retardant requirements)

Production method

Universal grade polystyrene is made by free radical polymerization or ionic polymerization of styrene as monomer. Production methods include bulk polymerization, solution polymerization, suspension polymerization and emulsion polymerization. Today's industrial production mainly adopts suspension polymerization and bulk polymerization.

1. The bulk polymerization method sends styrene monomer into the prepolymerization kettle, then adds a small amount of additives and initiator, and heat and stir at 95 ~ 115℃ for prepolymerization. After the conversion rate reaches 20% ~ 35%, then it is sent to the tower reactor with agitator for continuous polymerization. The polymerization temperature is increased to about 170℃ step by step to achieve complete conversion. A small amount of unreacted styrene is discharged from the top of the tower and can be recycled. The polymer is continuously discharged from the bottom of the tower, and the finished product is obtained after extrusion and granulation, and the product is delivered after packaging. The process is as follows.

2. Suspension polymerization uses styrene as monomer, water as medium, gelatin or starch, polyvinyl alcohol, Hydroxyethyl Cellulose and other protective glue or magnesium carbonate, magnesium silicate, calcium phosphate and other insoluble inorganic salts as dispersant, the sodium salt of maleic anhydride-styrene copolymer is used as auxiliary dispersant and benzoyl peroxide is used as initiator to initiate polymerization at about 85℃. It is also possible to conduct high-temperature polymerization in a high-pressure polymerization kettle at a high temperature above 100℃ without initiator. The polymer is washed, separated and dried to obtain colorless and transparent fine bead resin.