Several concepts about rubber
1. Rubber: The definition of rubber commonly used in the world is quoted from the American National Standards ASTM-D1566 (America Society of Test and Material). The definition is as follows:
Rubber is a material that recovers its deformation quickly and vigorously under large deformation and can be modified (vulcanized). The modified rubber is substantially insoluble (but swellable) in a solvent such as boiling benzene, methyl ethyl ketone or ethanol-toluene mixture. The modified rubber is stretched to twice the original length at room temperature (18~29 °C) and after removing the external force for one minute, it can recover to less than 1.5 times the original length in one minute. The material with the above characteristics Called rubber.


Note:
1) Rubber is a material with specific properties and processing properties and is an organic polymer material.
2) The rubber has high elasticity at room temperature.
3) The ability of rubber to be modified means that it can be vulcanized.
4) The modified rubber, that is, the vulcanizate, does not dissolve but swells.


2. Raw rubber: Rubber that has not been added with a compounding agent and has not been crosslinked.
It is generally composed of a linear macromolecule or a linear macromolecule with a branch and is soluble in an organic solvent.


3. Mixing rubber: rubber with raw rubber and compounding agent processed and mixed uniformly and not crosslinked.
Commonly used compounding agents include vulcanizing agents, accelerators, active agents, reinforcing fillers, anti-aging agents, and the like.


4. Vulcanized rubber: A rubber obtained by cross-linking a linear macromolecule into a three-dimensional network structure under the action of a certain temperature, pressure and time. Generally insoluble in solvents.


Related technical articles read:
Mixing sequence and process standard of rubber compound
Rubber mixing and rubber parking precautions
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