Ambient Temperature Binder Cure Catalysts for Hydroxy Terminated Systems.
Abstract
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: Fe(AA)3, Pb(AA)2, 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1970
- Accession Number
- AD0869515
Entities
People
- Adolf E. Oberth
- Edmund J. Mastrolia
Organizations
- Aerojet Rocketdyne Holdings