Gps fushan total 1540
General-grade polystyrene is a thermoplastic resin, which is a solid of colourless, smellless, glossy and transparent beads or particles. Density 1. 04 - 1. 09, transparency 88% - 92%, refraction rate 1. 59 - 1. 60. Under stress, there is a double refraction, the so-called stress-optic effect. The product has a melting temperature of 150 - 180°c, thermal decomposition temperature of 300°c, thermal deformation temperature of 70 - 100°c and long-term use of 60 - 80°c. At lower thermal deformation temperatures of 5 to 6°c, the stress can be eliminated and the the thermal deformation temperature can be increased after repulsion treatment. If a small amount of alpha-methyl styrene were added to the production process, the general polystyrene resistance level could be increased。
It is soluble in aromatic hydrocarbons, chlorinated hydrocarbons, adipose ketone and esters, etc., but only soluble in acetone. Certain mineral oils, organic acids, alkalin, salt, low-grade alcohols and their aqueous solutions are resistant. Low water intake still maintains its mechanical performance and size stability in a wet environment. Optical performance is second only to acrylic resin. Electricity performance, volume resistance and surface resistance are high and are not affected by changes in temperature and humidity or by electro-shock discharge. Irradiation tolerance is good。
Gps fushan total 1540
General-grade polystyrene is produced as a single styrene by free-based or ion-based polymerization. Production consists of integrative polymerization, soluble polymerization, suspended polymerization and emulsion polymerization. Currently, industrial production is based mainly on suspended polymeric and home-based polymeric methods。
1. Oxygen polymerization after 35%, it is sent into a tower reactor with a mixer for continuous polymerization. The polymer temperature is increased to about 170°c to reach full transformation. A small number of unreactive styrene is released from the roof and can be recycled for reuse. The polymers are produced continuously from the bottom of the tower and are then packed into a finished product when the particles are squeezed out。
Synthetic polymeric method styrene monomer, water medium, dispersing agents such as plastic or insoluble inorganic salt such as amphibole or starch, polyethylene alcohol, hydroethyl cellulose, etc., acetic anhydride-styrene phosphate, sodium styrene, initiation agent at about 85°c. High-temperature aggregates may also be performed at temperatures above 100°c in high-pressure aggregates without triggers. The polymer is washed, separated, dry and transparent in fine bead resin。
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