Polystyrene foam is made of polystyrene resin as the main body, with foaming agent and other additives added. It is the most commonly used cushioning material at present.

Definition

Polystyrene foam has a closed-cell structure, low water absorption, excellent water resistance; low density, generally 0.015-0.03; good mechanical strength, excellent cushioning performance; good processability, easy molding; good colorability, strong temperature adaptability, excellent anti-radioactivity, etc., and has high dimensional accuracy and uniform structure. Therefore, it has a high share in exterior wall insulation. However, when burned, it will release styrene gas that pollutes the environment. It is a Class B material in the construction profession.

Applications

Polystyrene foam is widely used in cushioning packaging of various precision instruments, meters, household appliances, etc. It can also be directly made into cups, plates, boxes and other packaging containers to package items. It is widely used in special well drilling construction (freezing method to construct composite well wall). It has good mechanical strength, excellent cushioning performance, good processability, easy molding, good colorability, strong temperature adaptability, excellent anti-radioactivity and other advantages.

Recycling

The main ways to recycle polystyrene foam are: granulation after volume reduction, crushing and use as various filling materials, cracking and oil production or recycling styrene and others.

1. Granulation after volume reduction: Polystyrene foam can be melt-extruded and granulated to make recycled granules, but it is bulky and inconvenient to transport. Usually, it needs to be reduced in volume before recycling. The methods include mechanical method, solvent method and heating method.

2. Used as filler after crushing: Polystyrene foam products can be used as fillers after crushing to make various products.

¢ÙRe-molding into foam plastic products

¢ÚConcrete composite board products

¢ÛGypsum sandwich bricks

¢ÜUsed as asphalt enhancer

¢ÝUsed as soil modifier

Three. Cracking to make oil or recovering styrene: The device for the cracking and oil-making method of waste polystyrene foam plastics is as follows:

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

Four. Others: Waste polystyrene foam plastics can be used to make coatings and adhesives, etc.

¢ÙCoatings: Expandable polystyrene foam plastics can be made into paint by adding appropriate solvents after crushing.

Polystyrene foam plastics are useful for molding expandable polystyrene beads. Foam plastics used for packaging of household appliances or frozen food; a few instant noodle bowls are also made of expandable polystyrene beads injection molding. These plastic products are large in size and require a large amount of tuition and miscellaneous fees, and their recycling is particularly valued in China.

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