VULCANIZING MIXTURE BASED ON FLUOROELASTOMER CONTAINING BROMINE AND/OR IODINE ATOMS IN POLYMER CHAIN Russian patent published in 1996 - IPC

FIELD: vulcanization of fluorine containing elastomers. SUBSTANCE: chained invention describes mixtures based on fluoroelastomer containing bromine and iodine in polymer chain and capable of being vulcanized under the effect of organic peroxides. During vulcanization these mixtures demonstrate insignificant liberation of toxic vapors of methyl bromide or iodide and are characterized in the they comprise, as cross linking agents, peroxides having the following formulae: (R₁)(R₂)(R₃) C O O C (R₅)(R₆)(R₇) or wherein R₁-R₁₇ are defined as follows: R₁, R₆ are the same or different C₂-C₄ alkyls, R₂, R₃, R₄, R₅ are the same or different alkyls, C₁-C₄ is C₁-C₆ alkyl, R₈, R₉, R₁₀, R₁₁ are the same or different C₁-C₃ alkyls, R₁₃, R₁₅ are the same or different C₂-C₄ alkyl, R₁₂, R₁₄, R₁₆, R₁₇ are the same or different C₁-C₄ alkyls. Vulcanizing mixture comprises 1.3- 8.5 wt parts of peroxide per 100 weight parts of elastomer. Organic peroxides include bis-(1,1- dimethylpropyl) peroxide, bis(1,1-diethyl propyl) peroxide, bis-(1-ethyl-1-1-methyl propyl) peroxide 1,1- diethylpropyl, 1-ethyl-1-methylpropyl) peroxide, 2,5- dimethyl-2,5-di-tert-amyl peroxyhexane. Vulcanizing mixture may additionally comprise 0.25-0.75 wt part of mercaptobenzthiazole disulfide per 100 wt parts of elastomer. Vulcanizing mixture may additionally comprise 1.5 wt parts of phenylmaleimide per 100 wt parts of fluoroelastomer. EFFECT: improved properties of the vulcanizing mixture. 9 cl, 8 tbl