Styrofoam is useful for molding polystyrene beads. Foam for packaging of household appliances or frozen foods; there are also a few instant noodle bowls that are injection molded from expandable polystyrene beads. These plastic products are bulky and have a large amount of tuition and fees, and their recycling has received special attention in China.
The main ways to recycle polystyrene foam are: granulation after volume reduction, pulverization for various filling materials, cracking to oil or recycling of styrene and Others.
(1) Granulation after volume reduction, polystyrene foam can be melt-extruded and granulated to produce recycled pellets, but it is bulky and transported by stool, and it is usually required to reduce volume before recycling. The methods are mechanical, solvent and heating.
(2) After being pulverized, it is used as a filler, and the polystyrene foamed plastic product can be used as a filler after being pulverized to prepare various products. Remolded into a foamed plastic product
2 Concrete composite board products
3 plaster sandwich brick
4 used as asphalt enhancer
5 used as a soil modifier
(3) The equipment for cracking oil or recovering styrene, waste polystyrene foam plastic cracking oil production method is as follows
Waste polystyrene foam pretreatment heat treatment volume reduction catalytic cracking rectification styrene
(4) Others, waste polystyrene foam can be used to make coatings and adhesives, etc.
1 coating, expandable polystyrene foam can be lacquered by adding appropriate solvent, the process is as follows
Filler, colorant
PS, ethyl acetate has been researched and developed.
Ethanol, dibutyl ester, ring should be milled, filter, mill filter
Oxygen resin, nitrile gel kettle
2 Adhesives, mixed solvents of esters and benzenes, adding waste polystyrene foam, anti-precipitant, plasticizer, phenolic resin and Other additives, can be used for coatings for cement, steel and wood.
3 Brominated polystyrene flame retardant by bromination, using aluminum dichloride as a catalyst to make electrophilic substitution reaction of waste polystyrene and bromine to obtain brominated polystyrene, the bromine content can reach 60% to 70 %, a flame retardant for thermoplastics such as PET, aBS, and nylon. Brominated polystyrene is cheap, has good flame retardant effect and thermal stability, and can have obvious flame retardant effect when used in 5 parts (mass). Used in combination with antimony trioxide, it has a good synergistic effect of flame retardant.
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