Once, twice and thrice vulcanization, what's the difference ~ ~

Primary vulcanization, secondary vulcanization and tertiary vulcanization refer to the three stages of vulcanization.

1. fluidity: the fluidity of the primary vulcanizate is good, the fluidity of the secondary vulcanizate is relatively poor, and the tertiary vulcanizate begins to cross-link and loses fluidity.

2. Crosslinking degree: the crosslinking degree of primary vulcanization is low, the crosslinking degree of secondary vulcanization is relatively general, and the crosslinking degree of tertiary vulcanization is the best.

3. Physical properties: the physical properties of primary vulcanization are weak, the physical properties of secondary vulcanization gradually get better, and the comprehensive balance of properties is achieved by tertiary vulcanization.

Extended data

According to the curing conditions, it can be divided into three types: cold curing, room temperature curing and thermal curing. Cold curing can be used to cure film products. When curing at room temperature, the curing process is carried out at normal temperature and pressure, such as bicycle inner tube joints and room temperature curing rubber slurry (mixed rubber solution) for repair. Thermal vulcanization is the main method of vulcanization of rubber products.

References:

Baidu encyclopedia-vulcanization