How to choose a vulcanization accelerator?

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Time of issue:2019-07-22 11:34
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(Summary description)The accelerator should make the rubber have a wide vulcanization flat curve during the most suitable vulcanization period, that is, the performance of the vulcanized rubber should not change significantly during this period, which is especially important for thick rubber products. Rubber is a poor conductor of heat. The surface of the vulcanized rubber material is inconsistent with the internal heat. The wide vulcanization flatness is a guarantee to avoid sulfur and make the product parts vulcanized uniformly.

How to choose a vulcanization accelerator?

Categories:Industry Information
Author:
Origin:
Time of issue:2019-07-22 11:34
Views:

Information

Three factors to consider when choosing an accelerator

1. Vulcanization flatness

The accelerator should make the rubber have a wide vulcanization flat curve during the most suitable vulcanization period, that is, the performance of the vulcanized rubber should not change significantly during this period, which is especially important for thick rubber products. Rubber is a poor conductor of heat. The surface of the vulcanized rubber material is inconsistent with the internal heat. The wide vulcanization flatness is a guarantee to avoid sulphur and make the parts of the product evenly vulcanized.

2. Dispersibility

Accelerators with poor dispersion properties not only require a longer mixing time in the rubber compound, which increases the power consumption of the equipment, but also tends to cause uneven vulcanization of the product due to uneven mixing. Generally, the low melting point accelerator in the glue is easy to melt and diffuse, so the dispersibility is good. For high melting point accelerators, it is best to use small particle size powder products. For some accelerators that are difficult to disperse, it can be used as a masterbatch.

3. Frost

The frosting of the mixture will cause poor adhesion in the subsequent process and reduce the appearance quality of the final product. It should be avoided as much as possible. The spraying of accelerator is related to the compatibility of accelerator and rubber. Non-polar EPDM is easy to spray, while polar nitrile rubber and neoprene are difficult to spray. Among the accelerators, especially the accelerators TMTD and ZDMC will be miscible with rubber, causing glue spray. The compatibility of ZDEC with ZDBC and rubber is better than that of TMTD and ZDMC, and the amount of spraying is less.

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