Ditetrasulfide will produce toxic gases during the vulcanization process, but it is not very serious.

Double penta vulcanizing agent and double tetras vulcanizing agent are the most important two kinds of silicone rubber vulcanizing agent, and there are both differences and common points between them.

The double pentasulfide agent has high decomposition temperature and good scorch performance. Since no products with carboxyl group are produced during decomposition, the thermal stability of the compound is not affected. Double penta vulcanization agent can be used in the rubber compound containing carbon black, and the application range is very wide. When double pentaculfide is used, the vulcanized rubber has lower compression deformation and higher elongation: at the same time, double pentaculfide is a vinyl-specific vulcanizing agent.

The advantages of 24 vulcanizing agent are low decomposition temperature and fast decomposition speed, so it is a commonly used vulcanizing agent for extrusion rubber. However, due to the low decomposition temperature of the double tetrasulfide agent, the scorch performance is not good, so the amount should be as little as possible. The decomposition products are 2.4-dichlorobenzoic acid and 2.4-dichlorobenzene, which are toxic and affect the heat resistance of the compound products. Because carbon black interferes with the vulcanization of double 24 vulcanization agent, it can not be used for mixing rubber containing carbon black: double 24 vulcanization agent can be used as a universal vulcanization agent.

In addition, after the amount of peroxide exceeds the appropriate amount, the elongation and tearing strength of vulcanized rubber will decrease, and the influence of double 24 is greater. Double 24 is generally used in extrusion, double 25 is used in molding. Double 24 is generally used in the extrusion calender process, the vulcanization temperature is generally 120 ° C, double 25 is generally used for molding, the vulcanization temperature is 170 ° C. Another difference, di25, is a vinyl-specific vulcanizing agent. Double two four is universal

Below, we will simply popularize platinum silicone products and double 24 silicone products from three aspects, hoping to help you identify when you usually buy such products:

1. Transparency
Under normal circumstances, platinum silicone products will use good transparency or particularly high vapor phase silicone to make the base adhesive, the transparency of the products produced is very good; The double 24 silica gel products are mostly used as raw materials, and the products are translucent.


2. Smell
The silicone products with platinum vulcanization basically have no residual odor on the products, odorless and non-toxic, and reach the EU food grade level; The double 24 vulcanized silica gel products will remain a large pungent smell, after a long time of exposure to volatilization, there will be, it is easy to distinguish the smell difference between the two.


3. Store to see the surface volatilization
Under normal circumstances, the silicone products obtained from platinum vulcanization will not form frosting on the surface after storage for a period of time; But the double 24 vulcanized silicone products spit cream will be quite serious, of course, some manufacturers will increase the second vulcanization according to the requirements of the guests before the production and shipment, to reduce the appearance of the later spit cream, it can be said that if the storage of a period of time, a lot of spit cream on the surface of the silicone products must be double 24 vulcanized ordinary silicone products.