Styrofoam recovery route

Styrofoam Useful Polystyrene beads can be molded. Foams for packaging of household appliances and other frozen or frozen foods; there are also a few instant noodles bowls made by injection of expandable polystyrene beads. These plastic products are bulky and have a lot of tuition and fees. Their recycling has received special attention in China.

The main methods for the recycling of polystyrene foams are: pelletizing after volume reduction, smashing and use as filling materials, cracking oil or recovering styrene and others.

(1) Granulation after volume reduction. Polystyrene foams can be melt-extruded and granulated to make recycled pellets. However, they are bulky and transport in bulk, usually requiring a volume reduction at the time of recycling. Methods include mechanical, solvent, and heating methods.

(2) After being crushed and used as a filler, polystyrene foam products can be used as fillers after being crushed to make various products. Such as 1 re-molded into foam plastic products

2 Concrete composite board products

3 plaster sandwich brick

4 Asphalt enhancer

5 as a soil modifier

(3) Equipment for pyrolysis oil recovery or styrene recovery, waste polystyrene foaming plastics cracking oil production method is as follows

Waste polystyrene foam pretreatment heat treatment volume reduction catalytic cracking distillation styrene

(4) Others, Waste Styrofoam can be used to make paints, adhesives, etc.

1 Paint, expandable polystyrene foam can be made into paint by adding proper solvent after crushing. The process flow is as follows:

Filler, colorant

PS, ethyl acetate anti-research

Ethanol, dibutyl ester, ring should be ground filter reactor filter

Oxygen resin, nitrile rubber pot

2 Adhesives, mixed solvents of esters and benzenes, adding waste polystyrene foams, anti-precipitation agents, plasticizers, phenolic resins, and other additives, can be made into coatings for cement, steel, and wood.

3 brominated brominated polystyrene flame retardant, using aluminum dichloride as a catalyst, to make the ethidium bromide polystyrene by electrophilic substitution reaction of waste polystyrene and bromine. The content of bromine can reach 60% to 70. %, for thermoplastic flame retardants such as PET, ABS, and nylon. The brominated polystyrene is inexpensive, has good flame retardant effect and thermal stability, and the amount of 5 parts (mass) can have a significant flame retardant effect. Combined with antimony trioxide, it has good flame retardant synergistic effect. (to be continued)