Waste plastic is in civil, industrial and other USES, used and eventually eliminated or replaced plastic collectively. Plastic, which takes 500 to 1,000 years to decay, often causes widespread contamination.
Recyclable waste plastic recycling can be divided into four levels:
Primary recycling refers to the use of the usual processing methods to recycle waste plastics (scraps, etc.) into new materials with the same or similar performance of the product.
Secondary recycling refers to the waste plastics (scraps, etc.) processed by one or more processing methods into products with slightly worse performance than new materials.
Three-stage recycling refers to recycling the chemical components of waste plastics to make them monomer or fuel.
Level 4 recycling refers to recycling energy from waste plastics through incineration.
Introduction to the
Waste plastic is in civil, industrial and other USES, used and eventually eliminated or replaced plastic collectively. It can be divided into: 1. Recycled plastic, 2. Reprocessed plastic, 3. Recycled plastic, 4. Reusable plastic, 5. Recyclable plastic, 6.
Thermoplastic plastics that are processed in advance by factory molding, extrusion, etc., and then reprocessed in a secondary processing plant with scraps or defective molding products.
2. Reprocess plastics
Thermoplastics prepared from waste industrial plastics by a non-raw processor.
Plastic made from washed and crushed waste products.
4. Reusable plastics
Plastic that can be used repeatedly after molding and whose properties meet the requirements of relevant regulations.
5. Recyclable plastic
A type of plastic that is allowed to be recycled and reprocessed after certain treatment.
6. Don't recycle plastic
A type of plastic that is not allowed to be recycled or reprocessed after being discarded.
The specific chemical composition and differentiation methods of different plastics are as follows:
Commonly used waste plastics are PE, PP, PVC, PET, EPS, PA, ABS
1. PET polyethylene terephthalate, also known as PET, is commonly found in special bottles.
Properties: the molecular structure is highly symmetrical and has certain crystal orientation ability, so it has high film-forming property and sex. PET has good optical properties and weather resistance, and amorphous PET has good optical transparency. In addition, PET has excellent abrasion resistance, dimensional stability and electrical insulation. The bottle made of PET is widely used because of its strong strength, good transparency, non-toxic, anti-permeability, light quality and high production efficiency.
2. HDPE and PE are basically divided into three categories: high pressure low density polyethylene (LDPE), high density polyethylene (HDPE) and linear low density polyethylene (LLDPE). Film is its main processing products, followed by sheet and coating, bottles, cans, drums and other hollow containers and other injection and blow molding products, pipe and wire, cable insulation and sheath. Mainly used in packaging, agriculture and transportation sectors.
HDPE high density polyethylene is commonly found in lotion containers, milk bottles, supermarket plastic bags.
LDPE low density polyethylene (LDPE) is commonly found in toothpaste or facial cleanser hose packaging.
3, PVC polyvinyl chloride - for example: water pipes, curtains, credit CARDS, packaging, kettles, flexible film.
PVC is common in pipes, outdoor furniture, raincoats.
Polypropylene is commonly found in bottle caps, straws, and microwave food boxes. Properties: cheap, light, good processability and wide range of applications. Catalysts and new process development further promote the expansion of application fields. It is said that "as long as there is a product whose material is replaced by plastic, then the product has the potential to use polypropylene". Main USES: woven bags, waterproof cloth, durable consumer goods, such as cars, home appliances and carpets.
5, PS polystyrene is divided into unfoamed or foamed. Unfoamed polystyrene, commonly found in some beverage containers (such as yakult); Already foamed bubble is commonly known as foamed gum, commonly seen in packaging with gelatine, disposable heat preservation rubber cup, packaging frozen meat container, lunch box.
Features: excellent electrical insulation (especially high frequency insulation), colorless, transparent, light transmittance after organic glass, coloration water resistance, good chemical stability, strength, but qualitative fragile brittle, easy to produce stress will not endure the benzene. Gasoline and other organic solvents. Suitable for making insulating transparent. Decoration and chemical equipment. Spare parts such as optical instruments.
6. Other recyclable plastics include PMMA acrylic: Lighting appliances, signs advertising, building Windows and doors, lie between the stairs a degree board, daylighting wave plate, roof cover, building decoration daylighting with boards, furniture, often supplies, electrical machinery industry product (machine transparent covers, helmets, optics, polycarbonate (PC), poly lactic acid (PLA), Nylon (Nylon) and glass fiber reinforced plastic (FRP), modified polystyrene plastic, high impact polystyrene (not brittle glue), general purpose polystyrene, Nylon, polyamide, polyformaldehyde, steel, organic glass, the strength, polycarbonate - (bulletproof glue) two-way stretch polylactic acid membrane (BOPLA), etc.