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ACTOR-TDDS
cas no: 51988-14-8 Vulcanizing Agent
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| Cost-Effective, High-Performance Vulcanizing Agent |
| for Chlorinated Polyethylene |
| ACTOR-TDDS vulcanizing agent is designed for use with halogenated elastomers such as chlorinated |
| polyethylene (CPE). It is supplied as an off-white powder with a specific gravity of 1.46. ACTOR-TDDS is a |
| blend of esters of 2,5-dimercapto-1,3,4-thiadiazole. In general, CPE compounds exhibit good resistance to oil, heat, |
| and ozone. The appropriate choice ofvulcanization system and formulating ingredients is the key to the ultimate performance |
| and costeffectiveness of CPE compounds. Peroxides have commonly been used as the cross-linker for CPE in |
| applications requiring optimum compression set and heat resistance. For less stringent applications, the |
| use of ACTOR-TDDS allows for a more highly-extended, lower-cost compound than is possible with peroxides. |
| The resultant vulcanizates cured with ACTOR-TDDS are high-performance compounds with heat resistance only |
| slightly less than that obtained by peroxide cures. |
| The Advantages of the ACTOR-TDDS Cure System are: |
| - Single pass mixing. |
| - No bloom or surface stains. |
| - Cure rate that can be accelerated. |
| - Cures not inhibited by oxygen. |
| - Lead-free compounds. |
| - Low compound cost. |
| COMPOUNDING WITH ACTOR-TDDS VULCANIZING AGENT |
| ACTOR-TDDS functions as a di-nucleophile, vulcanizing any elastomer containing replaceable halogen atoms. |
| Because of this, many inexpensive fillers, oils, and plasticizers can be used with ACTOR-TDDS. The cure |
| mechanism of ACTOR-TDDS involves hydrolysis of the thioester bonds within ACTOR-TDDS to form a |
| dimercaptide intermediate. This di-nucleophilic species then displaces halogens on the elastomer |
| backbone to become a cross-link. |
| ACTOR-TDDS should be used in conjunction with an amine accelerator and a basic metal oxide acid |
| acceptor/cure activator. The cure rate can be increased by increasing the level of the amine accelerator or |
| of the metal oxide; however, this often results in reduced heat-aging performance. Cure rate can also be |
| accelerated by including a water donor such as Epsom salts in the formulation. |
| To illustrate the compounding flexibility of ACTOR-TDDS, Table I lists the physical properties and aging |
| performance of model compounds. |
