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 panel products 3 Plaster sandwich brick 4 Used as asphalt enhancer 5 Used as 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 Developed Ethanol, Dibutyl Ester, Ring Milling Filter Pot Oxygen Resin, Nitrile 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.
5. Polyurethane recycling
Polyurethanes are complex and their products include soft and hard foam plastics, thermoplastic elastomers, and industrial products. They are widely used in automobiles, home appliances, chemical industry, daily use and other fields. Recycling can be performed separately according to common types.
(1) Recovery of polyurethane flexible foams. Flexible polyurethane foams can be mechanically recycled. One is coated with adhesive, and the other is used for compression and recycling.
(2) Reaction Injection Molded Polyurethane Recovery 1 is used as a filler for glass fiber reinforced RIM-PUR. 2 Blended with polypropylene. The old RIM-PUR comminuted material and PP concrete together can produce a flexible PP elastomer. There are 1, activation treatment 2, the addition of compatibilizer 3, and the addition of inorganic fillers. 3 Direct Compression Recycling RIM-PUR Recycled Material The crushed and pulverized powder can be directly compressed to produce various products without the need of adding adhesives. 4 Part of the thermal degradation recovery, the RIM-PUR waste was heated to a certain degree in the kneader, and the PU molecular chain in the material was broken and degraded. The material changed from a hard to a soft plastic state, and then the isocyanate was added to make the material. The degraded PU molecular chains are cross-linked to produce hard materials, which are used in automotive tool kits and require high strength and hardness.
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 panel products 3 Plaster sandwich brick 4 Used as asphalt enhancer 5 Used as 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 Developed Ethanol, Dibutyl Ester, Ring Milling Filter Pot Oxygen Resin, Nitrile 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.
5. Polyurethane recycling
Polyurethanes are complex and their products include soft and hard foam plastics, thermoplastic elastomers, and industrial products. They are widely used in automobiles, home appliances, chemical industry, daily use and other fields. Recycling can be performed separately according to common types.
(1) Recovery of polyurethane flexible foams. Flexible polyurethane foams can be mechanically recycled. One is coated with adhesive, and the other is used for compression and recycling.
(2) Reaction Injection Molded Polyurethane Recovery 1 is used as a filler for glass fiber reinforced RIM-PUR. 2 Blended with polypropylene. The old RIM-PUR comminuted material and PP concrete together can produce a flexible PP elastomer. There are 1, activation treatment 2, the addition of compatibilizer 3, and the addition of inorganic fillers. 3 Direct Compression Recycling RIM-PUR Recycled Material The crushed and pulverized powder can be directly compressed to produce various products without the need of adding adhesives. 4 Part of the thermal degradation recovery, the RIM-PUR waste was heated to a certain degree in the kneader, and the PU molecular chain in the material was broken and degraded. The material changed from a hard to a soft plastic state, and then the isocyanate was added to make the material. The degraded PU molecular chains are cross-linked to produce hard materials, which are used in automotive tool kits and require high strength and hardness.
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