Peroxides can not only vulcanize saturated carbon chain rubbers such as EPM, heterochain rubbers such as Q, etc., but also vulcanize unsaturated rubbers such as NR, BR, NBR, CR, SBR, etc. It is used to produce various rubber products. Compared with sulfur-vulcanized vulcanizates, the cross-linking bonds in the network structure of peroxide vulcanizates are C-C bonds, with high bond energy, high thermal and chemical stability, and excellent performance. Thermal oxygen aging resistance, no vulcanization reversion, low compression set of vulcanizate, but poor dynamic performance. It is widely used in static sealing or high-temperature static sealing products; some peroxides have odor, such as DCP, which should be paid attention to when using.
Commonly used peroxide vulcanizing agents and auxiliary vulcanizing agents
Commonly used peroxide vulcanizing agents are dialkyl peroxides, diethyl peroxides and peroxyesters, etc., which can vulcanize most rubbers. The selection of peroxides generally needs to be considered in terms of the half-life, volatility, odor, the influence of acid and alkali substances on it, the safety of processing, and the physical and mechanical properties of the vulcanizate. Wherein dialkyl peroxide is widely used, such as dicumyl peroxide (DCP) is suitable for 160X: vulcanization, the price is cheap 'is a vulcanizing agent used most at present; 1,1-di-tert-butylperoxy Base-3,3,5-trimethylcyclohexane (3M), suitable for lower temperature vulcanization. Common types of peroxide curatives are shown in the table.
The cross-linking efficiency of peroxide refers to the amount (mol) of 1 mol of organic peroxide that chemically cross-links the molecules of rubber products. If 1 mol of peroxide can generate 1 mol of rubber cross-linking bonds, the cross-linking efficiency is 1.
Peroxide vulcanization is the homolysis of peroxides under the action of heat or radiation to generate free radicals, such as alkyl peroxides to generate two alkoxy radicals, diacyl peroxides to generate two acyloxy radicals, peroxyesters Then one alkoxy radical and one free radical are produced. During thermal crosslinking of rubber products, tertiary alkyl groups and tertiary oxygen groups may be further cleaved to generate alkyl radicals.
Peroxides are widely used in static sealing or high temperature static sealing products.
Disclaimer: The picture materials and articles on this platform come from the Internet, so the copyright belongs to the original author. If there is any infringement on your copyright and interests, please contact us, we will apologize and delete it quickly. Article source: Rubber Technology Network
Latest news
- The Combination and Foaming Process of
- Famous tire enterprise with multiple d
- Ministry of Commerce Initiate a final
- The Effect of Carbon Black on the Cutt
- Stop work orders encounter rising pric
- Lanzhou Petrochemical's carboxylated n
Contact us
- ADD: Room 4210, CEC Business Hall, No. 121-4, Nanjing South Street, Heping District, Shenyang
- TEL: 13644907299
- FAX: 024-25361668
- E-mail: boss@long-green.cn
> Company new