It is elastic at room temperature, and can produce large deformation under the action of small external force, and can be restored to its original state after removing external force. Rubber is a completely amorphous polymer with low glass transition temperature (T g) and high molecular weight, exceeding several hundred thousand.
Rubber is divided into natural rubber and synthetic rubber. Natural rubber is made from rubber tree, rubber grass and other plants after extracting gum; Synthetic rubber is polymerized from various monomers. Rubber products are widely used in all aspects of industry or life.
Development:
Rubber industry is one of the important basic industries of national economy. Not only provide people with daily necessities, medical and other light industrial rubber products, but also provide various rubber production equipment or rubber parts to heavy industries and emerging industries such as mining, transportation, construction, machinery and electronics. It can be seen that there are many kinds of products in the rubber industry, and the backward industries are very broad.
In recent years, the rubber industry has made great progress. The existing sub-industries have risen steadily, and the new rubber sub-industries have developed rapidly. At the same time, there are still some problems in rubber industry, such as environment, resources, disasters and innovation.
In 2004, the total planting area of natural rubber in China was 696,200 hectares, the cutting area was 45 1.9 million hectares, and the dry rubber output was 573,300 tons. Among them, the planting area of rubber in state farms is 4 1. 1.00 million hectares, and that in private enterprises is 285,200 hectares, accounting for 59.03% and 40.97% of the total rubber area in China respectively.