Origin of plastic

I believe everyone has encountered this situation. After packing a dish in a restaurant, I found a big hole in the bottom of the plastic lunch box after returning home. It is estimated that the plastic lunch box is of poor quality and melted by the high temperature of the oil. He even joked that he probably ate half plastic and half vegetables, and he didn’t know what material it was made of.

These easy-to-break packaging boxes are basically foam boxes, which are made of foamed polystyrene resin. I wonder if you have noticed that in recent years, this kind of box seems to be used less and less, especially for takeaways. , all using transparent boxes.

The editor also discovered an interesting situation when checking relevant information. In 1999, foam tableware was stipulated to be eliminated by the end of 2000, which meant that it was no longer allowed to be used or produced. The white pollution was too serious. The ban was lifted on February 26, 2013, so although it is used less now, it is still used.

Nowadays, there are lunch boxes made of various materials, some are marked PP, some are PS, and some are made of PVC material. I don’t know the difference between them, nor do I know which ones are harmful to the human body.

Plastic is an indispensable part of our lives today. Literally, it can be understood as a material that can be shaped. It is a polymer material whose main component is a synthetic polymer compound, also called synthetic resin. In order to increase Some properties of the product will be added with some additives to change its properties. So what exactly is plastic and how to distinguish various plastic materials.

The earliest plastic appeared in the 19th century. People put camphor and a small amount of alcohol into natural cellulose to make artificial plastic. This material has plasticity and can be molded into various products under hot pressing. It was named celluloid. From then on The history of human use of plastics began, and polymer synthetic plastics began to appear in the 20th century.

Plastic is a kind of polymer in terms of molecular structure, which makes plastic very easy to shape. It can also be understood literally as a material that can be shaped, especially under high temperature and high pressure. Most plastics are made from fossils. Derived from fuels, oil and natural gas are the main raw materials, making them perfect materials for plastics.