The Characteristics of Various Types of ACCELERATOR and the main varieties
1. Thiazole
Thiazole (acid) accelerator vulcanization speed, vulcanization curve flat, vulcanized rubber comprehensive performance, good anti-aging properties, wide range of applications, suitable for natural rubber and a variety of synthetic rubber, and acid carbon black with, and Furnace carbon black with the need to pay attention to the risk of scorch.
Main varieties: accelerator M, DM, MZ
2. Sulfenamides
Sulfonamides and thiazoles in the same place is to promote the same base, but more than the thiazole more than an anti-coke base and activator. The promoting group is acidic and the activator is alkaline, so the sulfenamide-based accelerator is an acid-base self-synergist, which has the advantage of both thiazole-based accelerators and overcomes the shortcomings of short scorch time The Its characteristics
(1) The induction period is long, the vulcanization speed is fast, the vulcanization curve is flat, the vulcanized rubber has good comprehensive performance;
(2) Should be combined with the furnace carbon black, with adequate safety, which will facilitate the pressure, calendering and pressure mold compound full mobility;
(3) For high temperature fast vulcanization and thick product curing;
(4) With an acid accelerator to form an activated sulfenamide cure system.
Main varieties: accelerator CZ, NOBS, NS (TBBS), DZ
3. Thiuram
The thiuram-type accelerator contains two active groups and two promoting groups. Therefore, the vulcanization speed is short and the scorch time is short, which is an over-accelerating acid accelerator. Application should pay special attention to scorch tendencies.
Main varieties: Promoters TMTD, TMTM, TRA
4. Dithiocarbamates
Dithiocarbamate accelerators have a faster cure rate than thiuram promoters and are a super accelerating grade acid accelerator. It is very short induction period, for curing at room temperature and latex products vulcanization, but also for butyl rubber, EPDM vulcanization, which gives vulcanized rubber excellent anti-aging properties.
Main varieties: accelerator PX, ZDC, ZDMC
5, Guanidine
Guanidine accelerator is active base, there is no promotion base and other functional groups, so the vulcanization started slowly, the operation safety is good, the vulcanization speed is slow. Applicable to thick product vulcanization, to improve the sponge tensile stress. Guanidine accelerator easy to make the product aging cracking, discoloration pollution.
Main varieties: Accelerator D (DPG)
6, Thiourea
Thiourea-based accelerators have low efficiency and poor scorch-scavenging properties. In addition to chloroprene rubber for promoting and crosslinking, other rubbers are rarely used.
Main varieties: Accelerator NA-22 (ETU)
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