Correct understanding of plastics, toxic and non-toxic, good distinction, plastic products

Plastic products have long been involved in all aspects of our lives, and the media often reveal the safety issues of plastic products. In addition to the problems of plastic products themselves, it is obviously also important to correctly understand the properties of plastics. This article will make a small popularization of plastic-related knowledge.　　1, PET, polyethylene terephthalate 　　 main application: 　　 is most commonly used as a beverage bottle, screen protection film and other transparent protective film. PET can also be spun, which is what we often call polyester, so during the Olympics there is a saying that beverage bottles will be recycled to make clothing. Many sportswear pursuing breathability and lightness are made of polyester. The popular clothing material 'Queenliang' was also this thing a long time ago. However, due to the backward spinning methods at that time, the clothing of Zhenliang was not as comfortable to wear as it is now. In addition, PET also has many engineering applications.　　Caution for use: 　　 is non-toxic, but monomers, low molecular oligomers and side reaction products such as diethylene glycol may remain in the synthesis process. These are all toxic. The PET raw materials used in beverage bottles have strict national standards.　　 PET has a higher melting point in plastics. But general bottles are not recommended to be reused, especially for boiling water. Because PET bottles are generally thin and are manufactured by blow molding, when the bottle body is heated to about 90°C, due to the rearrangement of the PET molecular chain and internal stress, the bottle body will twist and shrink, and use at this time will easily cause burns. In addition, higher temperatures increase the risk of hazardous substances leaching out of the material.　　2, PE, polyethylene (high-density polyethylene: HDPE; low-density polyethylene: LDPE) 　　Main application: 　　 At present, PE is the most widely used plastic. With different modification methods, PE can be used in all aspects of daily life. More representative ones include plastic barrels, films, inner walls of paper cups, water pipes and cable sheaths.　　 Use caution: 　　 PE itself is non-toxic. However, some processing or modification additives, such as fillers, stabilizing additives or pigments, are used in production. Some additives are toxic. Since PE products will soften or even melt at higher temperatures, use at temperatures 100°C higher than the boiling water temperature should be avoided as much as possible. 3. The main application of PVC and polyvinyl chloride: 　　PVC is now mostly used to make some cheap artificial leather, foot pads, sewer pipes, etc.; due to its good electrical properties and certain flame retardant properties, it is widely used in the manufacture of wire and cable sheaths . In addition, PVC is widely used in industrial fields, especially in places with high requirements for acid and alkali corrosion.　　 Use attention: 　　 PVC production will use a lot of plasticizers (plasticizers, such as DOP) and heat stabilizers containing heavy metals, and the synthesis process is difficult to eliminate the existence of free monomers, these are considered to be toxic. Therefore, PVC is gradually being replaced by PP and PE in the application of human body contact, especially in medical and food applications.　　PVC is a kind of plastic that is not resistant to high temperatures and cannot be used in places with higher temperatures.　　4, PP, polypropylene　　 main application: 　　PP is also widely used, daily necessities such as packaging, toys, washbasins, buckets, hangers, water cups, bottles, etc.; engineering applications such as car bumpers. PP spun into silk is called polypropylene and is very common in textiles, non-woven fabrics, ropes, fishing nets and other products.　　Caution for use: 　　PP and PE have similar processing methods and scope of use, and they are also non-toxic. The possible threat comes from the additives in processing and modification. Especially due to the poor weather resistance of PP, anti-aging agents containing heavy metals may be used in production. Compared with PE products, PP products have slightly better heat resistance. Typical LOCKu0026LOCK water cups can be used at a temperature of 110°C, but no matter how high the temperature is, there is a danger of softening and melting, and should be avoided as much as possible.　　5, PS, polystyrene 　　 main applications: 　　 cheap transparent products, foam plastic, CD boxes, water cups, fast food boxes, insulation linings, etc.　　Caution for use: 　　The raw materials used to synthesize polystyrene are poisonous. Through a suitable synthesis process, the residual monomer of polystyrene is very small, but this material is rarely used in water cups.　　 Polystyrene is flammable, especially PS after foaming. Burning will produce a lot of toxic gas. In some high-rise fire house accidents, because the widely used PS foam board is used as the insulation material, a large amount of smoke and toxic gas generated after the fire have become the main cause of a large number of casualties.　　 The following items are combined into the “other” item in the recycling label: 　　6, ABS, acrylonitrile-butadiene-styrene copolymer 　
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