What is one of the materials used in photography?

1845 Cybertron, a chemist who lives in Basel, a city in the northwest of Switzerland, came across concentrated sulfuric acid and concentrated nitric acid on the table when he was 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 the original 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.

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.

The invention of plastic bags has brought great convenience to human life, but more and more people don't know how to use them effectively, which leads to the globalization of plastic bag pollution.

Compared with traditional plastic bags, environmental protection bags have the following advantages:

1, water solubility can be designed and selected, completely soluble in water, non-toxic and pollution-free;

2. Strong tensile strength and good tension;

3, high transparency and good luster;

4, high softness and good touch;

5. Good oil resistance, solvent resistance, heat sealing and printability;

6. Low permeability coefficient and good gas barrier;

7. Plastic snap buttons or adhesive bags can be added;

8. Excellent antistatic performance, no vacuuming, etc.

9. It can be degraded by water, air, sunlight and biology. Generally, it can be decomposed into harmless substances in a month or so.