Introduction to rubber basics and general knowledge of various gums


1. Rubber: It is an organic polymeric elastic compound with: (1) long-chain polymers (molecular weight in the tens to hundreds of thousands or more) (2) lively movement of the links of the molecular chain. (3) easy rotation and curling between the links of the molecular chain. (4) The intermolecular forces are small. (5) It is amorphous at room temperature. (6) The molecules can be cross-linked and have the necessary properties before and after cross-linking.

1. Rubber: It is an organic polymeric elastic compound with:

(1) long-chain polymers (molecular weight in the tens to hundreds of thousands or more)

(2) lively movement of the links of the molecular chain.

(3) easy rotation and curling between the links of the molecular chain.

(4) The intermolecular forces are small.

(5) It is amorphous at room temperature.

(6) The molecules can be cross-linked and have the necessary properties before and after cross-linking. 

2. Vulcanization: Under certain conditions, the rubber molecules are cross-linked from linear structure to reticular structure in the process called vulcanization.

3. Aging:

Rubber products in the molding process, long-term storage and use, due to oxygen, ozone, metal ions and other chemical substances, mechanical stress, light, high-energy radiation and other physical effects and the role of mold, insects and other biological erosion, will gradually become soft and sticky, hard, brittle or cracked, physical properties reduced, this phenomenon is called aging.

4. scorching:

In the various processing operations and storage process before vulcanization, the heat or high temperature conditions generated by mechanical action will cause early vulcanization of the rubber, resulting in a decrease in plasticity, thus making the subsequent operation difficult to carry out, this phenomenon is scorching or early vulcanization.

5. three elements of vulcanization:

That is: vulcanization time, vulcanization temperature and vulcanization pressure are called the three elements of vulcanization.

Classification of rubber: natural rubber and synthetic rubber.

1. Natural rubber (NR).

The raw material of natural rubber comes from the rubber plant tree. Its advantages are: good elasticity, high strength, good insulation, small deformation, easy processing. Its disadvantages are: not oil-resistant, poor temperature resistance, easy to age, and generally used with blending. Generally produce automobile tires and some shock-absorbing and wear-resistant rubber parts.

2. Synthetic rubber:

Synthetic rubber has: SBR, NBR, BR, EPDM, IIR, CR, ACM, HNBR, CSM, FKM, MVQ, etc.

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