Ambient Temperature Binder Cure Catalysts for Hydroxy Terminated Systems.
Quarterly technical rept. 2 Jan-31 Mar 70,
AEROJET SOLID PROPULSION CO SACRAMENTO CA PROPELLANT DEVELOPMENT DEPT
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A large number of compounds were screened for potential use as catalysts for the ambient temperature cure ofpolyurethane propellants. The compounds tested may be divided into three groups Metal-chelates, metal salts and alkyltin salts. Screening tests included catalytic activity tests, both with simple alcohols methanol and butanol and prepolymers, such as polyether diol PPG and hydroxyl terminated polybutadiene R-45. The isocyanates in these tests were tolylene diisocyanate, hexamethylene diisocyanate and butyl- and phenyl isocyanate. Activity tests were followed by binder cure studies in the polyether and HTPB prepolymers. Mechanical properties, swelling and aging tests were conducted on the binders. Propellant cure tests were also conducted with the same two binder systems. Potential candidates that survived the screening tests are FeAA3, PbAA2, Pb-octoate, Pb-naphthenate, tin octoate and dibutyltin-fatty acid salt. The investigation of the causes of cure failure by infrared spectroscopy has begun. Homopolymerization of the isocyanate brought about by the catalyst has also been demonstrated. Author
- Physical Chemistry
- Solid Rocket Propellants