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Why are plastic bottles divided into food packaging and medical packaging?

Update:02-04-2021
Summary:

Plastic is just a general term, not a compound, but a g […]

Plastic is just a general term, not a compound, but a general term of many kinds. Common ones include six kinds of PE, PP, PS, PVC, ABS, PA. They are all called plastics, but they are completely different, depending on their characteristics. the use of. Like medical containers, PE is generally used, and PP is mostly used for food, and some illegal vendors use PS and PVC to make them. They are poison lunch boxes.

PE is a polyethylene plastic with stable chemical properties. It is usually used to make food bags and various containers. It is resistant to corrosion by acid, alkali and saline solution, but it is not suitable to be wiped or soaked with strong alkaline detergents.

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PP is polypropylene plastic, non-toxic and tasteless, and can be immersed in boiling water at 100°C without deformation or damage. Common acid and alkali organic solvents have almost no effect on it. Mostly used for food utensils.

PS is a polystyrene plastic, which is easy to color and has good transparency. It is mostly used to make lampshades, toothbrush handles, toys, and electrical parts. It is resistant to acid and alkali corrosion, but is easily soluble in organic solvents such as chloroform, dichloroethylene and banana water.

PVC is a polyvinyl chloride plastic with bright color, corrosion resistance, firmness and durability. Due to the addition of some toxic auxiliary materials such as plasticizers and anti-aging agents in the manufacturing process, its products generally do not store food and medicine.

ABS is a plastic polymerized by acrylonitrile, butadiene, and styrene. It has eye-catching color, heat-resistant, strong, and the outer surface can be plated with chrome, nickel and other metal films. It can be used to make keys, buttons, knife holders, TV housings, and umbrella handles, and so on.

PA is a nylon plastic. It is tough, firm, and wear-resistant. It is often used to make combs, toothbrushes, clothes hooks, fan bones, mesh bags, and fruit outer packaging bags. Non-toxic, but not long-term contact with acid and alkali.