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What material is PVC

2019-07-10 11:40:47
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PVC is the abbreviation of the English trade name of polyvinyl chloride, POLYVINYL CHLORIDE, and is a very commonly used plastic among the five general plastics. In the synthesis process, there are two production methods: suspension method and emulsion method according to the dispersed carrier. According to the source of raw materials, it can be divided into calcium carbide method and petroleum gas cracking method. There are seven commonly used models produced by the suspension method on the market, which are used according to the requirements of the product's soft and hard products. For example, soft products use 2-4 types, such as shoe soles, plastic sandals and slippers, and wire and cable sheaths. Type 5-7 for hard products. Such as hard pipes, plates, etc. The emulsion method is only used in paint and slush products, such as soft plastic dolls.

The production process of PVC products includes injection, for example, shoe soles, slippers, etc., and the calendering process includes artificial leather and soft plates. Extrusion processes include tubes, plate profiles, and films. Blow molding processes include plastic cans, bottles and films, as well as molding, casting, laminating, molding, slush molding and other processing techniques.

What kind of material is food PVC? Generally speaking, soft PVC is non-toxic, and rigid is toxic. Polyvinyl chloride is also a kind of plastic that is often used. It is a resin composed of polyvinyl chloride resin, plasticizer and antioxidant, and it is not toxic. However, the main auxiliary materials such as plasticizers and antioxidants are toxic. The plasticizers in daily PVC plastics mainly use dibutyl terephthalate and dioctyl phthalate. These chemicals All are toxic, and lead stearate, the antioxidant of polyvinyl chloride, is also toxic. Lead is precipitated when PVC products containing lead salt antioxidants come into contact with ethanol, ether and other solvents. Lead-containing PVC is used for food packaging and encounters with fried dough sticks, fried cakes, fried fish, cooked meat products, cakes and snacks, which will cause lead molecules to diffuse into the grease, so PVC plastic bags cannot be used Contain food, especially food containing oil.

  In addition, polyvinyl chloride plastic products will slowly decompose hydrogen chloride gas at a higher temperature, such as about 50 degrees, which is harmful to the human body, so polyvinyl chloride products are not suitable for food packaging. Bakelite (phenolic plastic) contains free phenol and formaldehyde, which is toxic to the human body, and is not suitable for food storage and food packaging. Although electric jade (urine-formaldehyde plastic) is odorless and tasteless, free formaldehyde will precipitate when it is used in 100 degrees boiling water or used to hold vinegar food, which is harmful to the human body, so it is not suitable for food or food packaging. Renewal products of waste plastics (some may add a little new material), because of their complex composition, it is difficult to guarantee that they are not toxic, so generally they cannot be used as food containers and packaging

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