Century Creation (International) Co., Ltd

Principle of Rubber Vulcanization Process

21-04-2020

  The terms of vulcanization process (vulcanization) is commonly used in rubber industry and occupies an important position in rubber chemical industry. Rubber vulcanization is a process that assumes the plasticity between rubber molecules as the elasticity and dimensional stability of raw rubber through chemical crosslinking, to make the vulcanized rubber have stable physical properties and wide application temperature range.

  The molecular chain reaction ability between rubber vulcanization (crosslinking) depends on its structure. Unsaturated diene rubber (e.g. natural rubber, styrene-butadiene rubber and nitrile rubber) contains unsaturated double bonds, whose molecular chains form intermolecular crosslinking with organic peroxides such as sulfur and phenolic resin through substitution or addition reaction. Saturated rubber generally has certain free radical energy, such as organic peroxide crosslinking and high energy radiation. Rubber containing special functional groups (e.g. chloro-sulfonated polyethylene, etc.) reacts crosslinking with specific forms of given materials through various functional groups, for example, the sulfonamides in rubber are crosslinked by reaction with metal oxides and amines.

  Rubber is embrittled by heating, cooling and hardening, which is not easy to form but easy to wear, easy to dissolve in organic solvents such as gasoline, has double bonds in its molecule that is easy for addition reaction, and easy to aging. In order to improve the performance of rubber products, a series of processing must be carried out on the raw rubber in the production. Under certain conditions, the raw rubber and the rubber vulcanizing agent undergo chemical reaction, to form the three-dimensional reticular macromolecular structure by crosslinking macromolecules with linear structure, to make the rubber material have excellent properties such as high strength, high elasticity, high wear resistance, corrosion resistance and the like, which the processing is called rubber vulcanization.

  The vulcanization processing is generally divided into four stages: induction of vulcanization, pre-vulcanization, normal vulcanization and over-vulcanization. In order to complete this reaction, the vulcanization temperature must be reached, and then the rubber insulation layer is allowed to complete vulcanization within the temperature range.


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