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: Styrofoam can be melt-extruded and granulated to produce recycled pellets, but it is bulky and transported by stool. Usually, it needs to be reduced in volume. The methods are mechanical, solvent and heating.
2. Used as a filler after pulverization: Styrofoam products can be used as fillers after pulverization to make various products.
1 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. Pyrolysis oil production or recovery of styrene: The equipment of the waste polystyrene foam plastic cracking oil production method is as follows
Waste polystyrene foam pretreatment heat treatment volume reduction catalytic cracking rectification styrene
4. Other: waste polystyrene foam can be used in the manufacture of coatings and adhesives, etc.
1 Coating: The expandable polystyrene foam is pulverized and then added with a suitable solvent to make the paint.
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 Adhesive: a mixed solvent of esters and benzenes, added to waste polystyrene foam, anti-precipitant, plasticizer, phenolic resin and other additives, can be made into 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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