Who invented the convenient bag (plastic bag) and when?

1845 Sernbo, a chemist who lives in Basel, a city in the northwest of Switzerland, accidentally encountered concentrated sulfuric acid and concentrated nitric acid on the table while doing experiments at home. He quickly picked up his wife's cloth apron and wiped the mixed acid on the table. In a hurry, he hung his apron by the fire to dry, but it suddenly caught fire and turned to ashes in an instant. Cybertron returned to the laboratory with this "great discovery" and had "accidents" again and again. After many experiments, Cybertron finally found the reason: the main component of cloth apron was cellulose, which contacted with the mixed solution of concentrated nitric acid and concentrated sulfuric acid to produce nitrocellulose ester, which was later widely used as nitrocellulose. Thainber discovered the plasticity of nitrocellulose, what's more, things made of nitrocellulose are not waterproof. He made some beautiful rice bowls, cups, bottles and teapots with it. He admired his masterpiece so much that he even wrote a letter to his good friend and famous scientist Faraday. It's a pity that Faraday didn't care until a photographer appeared. Environmental protection plastic bag

Photographer Alexander Parks has many hobbies, and photography is one of them. In the19th century, people can't buy ready-made photographic films and chemicals as they do today. They must always make what they need. So every photographer must also be a chemist. One of the materials used in photography is "collodion", which is a kind of "nitrocellulose" solution, that is, nitrocellulose solution in alcohol and ether. At that time, it was used to stick photosensitive chemicals on glass and make photographic film equivalent to today. In the 1950s of 19, Parks studied different methods to treat collodion. One day, he tried to mix collodion with camphor. To his surprise, a flexible hard material was produced after mixing. Parks called this substance "Paxsin", which was the earliest plastic. Parks made all kinds of objects with Paxsin: combs, pens, buttons and jewelry patterns. However, Parks is not very business-conscious. He lost money in his business venture. In the 20th century, people began to explore new uses of plastics. Almost everything in the house can be made of some kind of plastic. Leave it to other inventors to continue to develop Parks' achievements and profit from them. John wesley Heath, a printer from New York State, saw this opportunity in 1868, when a billiards company complained about the shortage of ivory. Heath improved the manufacturing process and gave Paxsin a new name-celluloid. He got a ready-made market from billiards manufacturers, and soon he made various products out of plastic. Early plastic caught fire easily, which limited the range of products made from it. The first plastic that can successfully resist high temperature is "Beckett". Leo Baekeland obtained this patent on 1909. 1909, phenolic plastics were synthesized for the first time in Baekeland, USA. In 1930s, nylon came out again, which was called "a kind of fiber composed of coal, air and water, thinner than spider silk, harder than steel and better than silk". Their appearance laid the foundation for the invention and production of various plastics. Due to the development of petrochemical industry in World War II, the raw material of plastics replaced coal with oil, and the plastic manufacturing industry also developed rapidly. Plastic is a very light substance, which can be softened by heating at a very low temperature and made into various shapes at will. Plastic products are bright in color, light in weight, not afraid of falling, economical and durable. Its appearance not only brings a lot of convenience to people's lives, but also greatly promotes the development of industry. However, plastics were invented less than 100 years ago. If people were ecstatic about their birth at that time, now they have to deal with these things that are full of life and pose a great threat to the living environment of mankind. In 2008, supermarkets said no to plastic bags.

Plastic is a chemical petroleum product extracted from petroleum or coal, and it is difficult to degrade naturally once it is produced. Plastics buried in the ground for 200 years will not rot and degrade. A large amount of plastic garbage buried in the ground will destroy the permeability of soil, harden the soil and affect the growth of plants. If domestic animals eat plastic mixed with feed or left in the wild by mistake, they will also die because of digestive tract obstruction.