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| CURE-RITE IBM |
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| N,N,N',N' - tetraisobutylthiuram monosulfide |
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Cure-Rite IBM is a non-staining ultra accelerator for EPDM, SBR, Nitrile, and Natural rubbers that produces very low levels of nitrosoamines (100 times less than common thiurams).
Cure-Rite IBM is a fast curing accelerator that creates shorter sulfur-sulfur crosslinks in rubber vulcanizates.
When IBM is used in combination with sulfenamide accelerators, it not only increases cure rate but also increases the scorch safety beyond that of the sulfenamide alone.
This allows for safer working environments while at the same time improving processing conditions of mechanical rubber goods.
Possible accelerators that IBM may replace include TMTD, TETD, DPTT, TMTM, TBzTD and some dithiocarbamates.
The outstanding scorch protection combined with good cure time of the IBM allows for higher processing temperatures and mold temperatures which may translate to shorter cycle times or allow successful molding of hard-to-process stocks.
Curerite IBM is also remarkable in that it results in much less reversion of natural rubber compounds than comparable accelerators: again this may allow shorter, higher temperature cures.
In combination with Cure-rite 18, natural rubber compounds with excellent scorch safety can be made with flat-plateau cure curves at 350'F.
Being a higher molecular weight accelerator, more IBM by weight should be used if replacing other thiurams (1.6 x TMTD phr
1.85 x TMTM: 1.33x TETD).
The exception is the replacement of TBzTD would require only 0.70 as much IBM.
A formula with a sulfenamide (TBBS, CBTS, OBTS) and sulfur cure can be accelerated to cure faster with no loss or even some improvement in scorch delay by replacing 20% of the ulfenamide with Curerite IBM. |
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Appearance : yellow powder
Heat Loss : 1.0%
Melting Point: 60-65'C
Solubility: negligible in Water |
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