Polyethylene PE?

When not colored, it is milky white, translucent and waxy; the product feels smooth when touched by hand, soft and tough; it can be slightly stretched. Generally, low-density polyethylene is softer and has better transparency; high-density polyethylene is harder. ?

Common products: handbags, water pipes, oil drums, beverage bottles (calcium milk bottles), daily necessities, etc. ?

Polypropylene PP?

It is white, translucent and waxy when not colored; lighter than polyethylene. The transparency is also better than polyethylene and harder than polyethylene. ?

Common products: basins, barrels, furniture, films, woven bags, bottle caps, car bumpers, etc. ?

Polystyrene PS?

Transparent when untinted. When the product is dropped or knocked, it will have a metallic-like crisp sound. It has a good luster and transparency, similar to glass. It is brittle and easy to break. You can scratch the surface of the product with your fingernails. Modified polystyrene is opaque. ?

Common products: stationery, cups, food containers, home appliance casings, electrical accessories, etc.?

Polyvinyl chloride PVC?

The natural color is slightly yellow and translucent Shape, shiny. The transparency is better than polyethylene and polystyrene, but worse than polystyrene. Depending on the amount of additives, it is divided into soft and hard polyvinyl chloride. Soft products are flexible and tough and feel sticky, while hard products have a higher hardness than low-density polyethylene. , and lower than polypropylene, whitening will occur at the inflection point. ?

Common products: sheets, pipes, shoe soles, toys, doors and windows, wire sheaths, stationery, etc.?

Polyethylene terephthalate PET?

The transparency is very good, the strength and toughness are better than polystyrene and polyvinyl chloride, and it is not easy to break. ?

Common products: often bottle products such as cola, mineral water bottles, etc.?

Polyethylene waste?

Polyethylene is the largest and most produced plastic. A very versatile thermoplastic, it is polymerized from ethylene and is a partially crystalline material that can be processed using the same molding methods used for general thermoplastics. Polyethylene can be divided into three categories: high-density polyethylene, low-density polyethylene and linear low-density polyethylene. ?

The density of high-density polyethylene is generally higher than 0.94g/cm, while the density of low-density polyethylene and linear low-density polyethylene is between 0.91 and 0.94g/cm. There are two main sources of waste polyethylene films: scraps and defective products produced in film production. These waste materials are clean and have clear varieties. They can be crushed and compressed and sent directly to the extruder for granulation. The recycling process is relatively simple. ?

2. Waste films from the chemical industry, electrical industry, food and consumer goods industry, etc. These waste films have been contaminated, some have been colored and printed with trademarks, and some also contain impurities such as sand, sawdust or shredded paper. ?

Because polyethylene is cheap, easy to obtain, and easy to mold, its products have a wide range of applications, but the most used ones are packaging products, estimated to be more than 60. High-density polyethylene is mainly used in packaging films, bottles, and hollow containers; low-density polyethylene is mainly used in packaging films and agricultural films; linear low-density polyethylene is mainly used in films, film plastics, and pipes. And on wires and cables. ?

Polyvinyl chloride waste?

Polyvinyl chloride used to be the most widely used plastic in history. Now it is replaced by polyethylene and PET in some fields, but it is still In large-scale use, its consumption is second only to polyethylene and polypropylene. Polyvinyl chloride products are available in various forms and can be divided into three categories: hard polyvinyl chloride, soft polyvinyl chloride, and polyvinyl chloride paste. Rigid polyvinyl chloride is mainly used in extruded products such as pipes, door and window profiles, and sheets, as well as injection molded parts such as pipe joints, electrical parts, and extrusion-blown bottle products. They account for more than 65% of PVC consumption. Soft PVC is mainly used in calendered sheets, automotive interiors, handbags, films, labels, wires and cables, medical products, etc. PVC paste accounts for about 10% of PVC products, and its main products include slush molding products. ?

Polymethylmethacrylate waste?

Polymethylmethacrylate (PMMA) is commonly known as organic glass.

PMMA has unique properties that other plastics do not have: excellent transparency (close to glass); good toughness, chemical resistance, and weather resistance. Therefore, it has been widely used in automobiles, medical equipment, indoor swimming pools, etc. With the development of automobiles and other related industries, the usage of PMMA is also increasing. There are three main categories of PMMA products: sheets made by casting or extrusion methods; specific products that already contain additives such as modifiers and pigments; paints and coatings. ?

Polystyrene waste Polystyrene is a homopolymer of styrene and a general-purpose thermoplastic plastic. Its output is second only to polyethylene, polypropylene and polyvinyl chloride. Polystyrene has a wide range of applications. It can be roughly divided into the following four aspects:?

General-purpose polystyrene: it is used in a large number of daily products as well as transparent products such as home appliances, computers, and medical care. ?

High-impact polystyrene: Its impact strength and elongation at break are greatly improved. The products are widely used in electrical accessories, home appliance casings, food containers, etc. ?

Extruded foamed polystyrene sheets and their thermoformed products: Thick sheets are mainly used as thermal insulation, sound insulation, and shock-proof materials. Thermoformed products are widely used in food packaging and fast food containers. ?

Expandable polystyrene foam products: products are used in shock-proof packaging for electrical appliances and thermal insulation materials in construction, refrigeration and other industries. ?

The first two types of polystyrene products have a long service life and can be recycled by conventional recycling methods, so they put less pressure on the environment. The latter two types of polystyrene products are mostly disposable packaging, which are large in size and consume a lot. If they are directly discarded without processing, they will cause great pressure on the environment. A large part of what people often call "white pollution" is styrofoam. ?

Polyethylene terephthalate waste?

Polyethylene terephthalate (PET) is terephthalic acid or dimethyl para The condensation polymer of polyterephthalate and ethylene glycol ester is a linear thermoplastic. PET is usually a crystalline plastic, but in bottles and film products, in order to make it highly transparent, special process conditions can be used to make it an amorphous plastic. ?

PET has a wide range of uses due to its excellent performance and low cost. According to its product form, it can be divided into four categories: polyester fiber, film, engineering injection molded parts, and bottles. PET bottles have replaced some traditional packaging materials due to their advantages such as light weight, non-breakability, and low energy consumption. They are widely used in food, beverages, and other fields. Especially for beverage bottles, PET has an absolute advantage. Beverage bottles are single-use, so the amount of waste is huge. ?

The recycling technology of PET bottles has reached a very high level abroad, and the recycling rate in the United States, Germany and other countries has now reached more than 80%. Not only that, in order to facilitate recycling, these countries have also formulated some local regulations, which have mandatory regulations on the disposal, collection, use, design and manufacturing of PET bottles. ?

A simple classification of the sources of waste plastics[/B]?

Plastics, especially thermoplastic plastics, will generate waste or waste in every link such as synthesis, molding processing, circulation and consumption. products, collectively referred to as "plastic waste", the vast majority of which are generated during consumption and use, and packaging materials, agricultural films and disposable products have the largest amount of waste. ?

Generation of waste plastics: ?

1. Waste produced in resin production; ?

2. Waste produced in molding process;?

3. Waste materials generated during compounding and recycling processing;?

4. Waste materials generated during secondary processing;?

5. Industrial post-consumer plastics Waste materials;?

This kind of waste materials come from a wide range of sources and are used in complex situations. They must be processed before they can be recycled and reused.

This type of waste includes:?

1) Bags, barrels, etc. used in the chemical industry;?

2) Containers, waste rayon, etc. in the textile industry;?

3) Packaging materials, foam anti-shock pads, etc. in the home appliance industry;?

4) Building materials, pipes, etc. in the construction industry;?

5) Shrink film, stretch film, etc. in the filling industry;?

6) Turnover boxes, egg trays, etc. in the food processing industry;?

7) Mulch film, Greenhouse films, fertilizer bags, etc.;?

8) Fishing nets, floating balls, etc. in the fishery;?

9) Bumpers, fuel tanks, and battery boxes removed from scrapped vehicles wait. ?

6. Waste plastics after daily consumption