Prevention of unwanted cure catalysis in isocyanate cured binder

Explosive and thermic compositions or charges – Structure or arrangement of component or product – Solid particles dispersed in solid solution or matrix

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149 194, 149 199, 149 20, C06B 4510

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active

045978115

ABSTRACT:
This disclosure identifies certain dicarboxylic acids (e.g., maleic and oic) and methods of use to obtain extended pot life in diisocyanate cured polymer systems such as hydroxy terminated polybutadienes, polyesters etc. These compounds also prevent catalysis of the urethane reaction by cure inducing materials such as catocene, iron oxide, ferric floride, etc. without interfering with the function of the cure catalyst triphenylbismuthine.
With use of one of these compounds, TPB catalyst can be used even with the more reactive isocyanates. This can be highly desirable since TPB appears to promote the urethane reaction and hence because of this selectivity potentially reduces undesirable side reactions.
Typically pot life is changed from 0-2 hours to 12-15 hours.
The acids must be preblended with the curing agent 30 minutes to 1 hour for more reactive diisocyanates, and 30 minutes to 3 hours for slow reacting diisocyanates such as IPDI to prevent gassing in the propellant.
Pot life increase of the same type has been found to apply to a crosslinked double base propellant and a propellant using a polyester binder.

REFERENCES:
patent: 4070213 (1978-01-01), Cucksee et al.
patent: 4110135 (1978-08-01), Graham et al.
patent: 4181545 (1980-01-01), Anderson

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