Overview of HCR Silicone Rubber

HCR silicone rubber refers to its vulcanization temperature between 165-190C, using peroxide as the vulcanizing agent, and produced through high-temperature molding. The rubber material is a mixed silicone rubber without vulcanizing agent. We refer to this solid rubber as high-temperature solid rubber.

HCR silicone rubber has many advantages, such as good breathability; It can be vulcanized at 170 ° C, fast and convenient; High tear resistance; Good resistance to yellowing, etc. Common peroxide vulcanizing agents used for high-temperature solid adhesives include 2.5-di-tert-butylperoxyhexane, abbreviated as "di-2-5", with an dosage of 0.5-1.0%; 2.4 Dichloroperoxybenzol, abbreviated as "bis (2,4)", with an dosage of 1.0% -1.5%;

There are also many determinations for HCR silicone rubber, such as:

1. When using the "Double 25" vulcanizing agent, a large amount of harmful waste gas is generated during the production process due to the decomposition of the vulcanizing agent, which affects the operating environment.

2. The molding vulcanization temperature can reach as high as 165-190 ° C, which consumes a lot of power resources and also causes an increase in the temperature of the molding production environment.

3. The residual decomposition products of vulcanizing agents in silicone rubber products produce unpleasant odors that require secondary sulfur addition to be removed. If the "Double 25" vulcanizing agent is impure or mixed with benzoyl peroxide, then male silicone rubber products are also prone to "frost spraying" phenomenon, which is the decomposition products of vulcanizing agents that move to the surface of silicone rubber, forming color crystals.

4. The use of "Double Two Four" vulcanizing agent generates a large amount of harmful waste gas during the production process due to the decomposition of the vulcanizing agent, which affects the operating environment.

5. The residual decomposition products of vulcanizing agents in silicone rubber products require secondary sulfur addition to be removed. Silicone rubber products are also prone to "frost spraying", especially black silicone products, which may appear to have "mold" on the surface after being left for several months.