Where did the rubber come from?

We all have this experience, physical education class will change into sneakers, because the soles of sneakers are wear-resistant, elastic and non-slip, which can not only improve sports performance, but also effectively protect knees. Maybe you will ask, does the car have shoes? The answer is yes. The four tires of a car are equivalent to the shoes of a car. What's more interesting is that car shoes and our sneakers are made of the same material-yes, rubber.

Natural rubber comes from nature. In nature, there are as many as 2000 kinds of plants containing rubber, but few of them are really valuable for collection. At present, rubber has been extracted from 500 kinds of plants, including dandelion, which we are familiar with. I don't know if you tried it when you were a child. Dandelion will secrete some white liquid when it is cut off. When you touch it with your hand, it feels sticky. This is rubber. There is also a tall tree-Eucommia ulmoides Oliv. Some people are familiar with it because it is a medicinal plant. In addition, it can extract gum from seeds, leaves and bark. However, the gum yield of these plants is relatively low, and there are other plants that can really meet 98% of the world's industrial milk sources. What is this? This is a rubber tree with three leaves.

Hevea brasiliensis, also known as Hevea brasiliensis, belongs to Hevea brasiliensis of Euphorbiaceae. Compared with other rubber trees, rubber trees have two advantages: first, they are tall and contain a large amount of rubber; Second, long life, a tree can provide rubber for human beings for 30 to 40 years.

Hevea brasiliensis is native to the Amazon river basin in Brazil. Back to 1000 years ago, rubber trees grew silently in the depths of Amazon forest in South America. After the bark is cut, the white latex will drop drop by drop, just like tears. Therefore, it is called "weeping tree" in ancient Indian. Ancient Indians have learned to use some primitive methods to extract glue and make some products, such as playing elastic balls, elastic bottles, and even coating them on clothes or feet to play a waterproof role.