Ambient Temperature Cure Catalysts for Carboxy Binder Systems. Selection and Evaluation of Catalysts for the Ambient Cure of Epoxy-Carboxy Binders.
Abstract
An extensive series of organometallic compounds and metal carboxylates are being screened to determine their utility as catalysts for the ambient temperature cure of carboxylic acid-epoxide binders. Chromium salts have thus far been found to be the most effective, giving complete and stoichiometric reaction at the 1% level at 25C in less than 7 days in both model studies and binder cure reactions. Iron salts, notably ferric octoate, give good rate control up to approximately 75% conversion after which there is a deviation in stoichiometry (epoxide is consumed faster than acid) and apparent destruction of the catalyst. All other materials examined were poor ambient temperature catalysts for the epoxide-carboxylic acid reaction. Chromium 2-ethyl hexanoate (octoate) has been selected for primary evaluation in the carboxylic acid-epoxide binder propellant studies. The Telagen prepolymer was found in gumstock studies to cure at ambient temperature with the tri-epoxide ERLA 0510 in 1 week with 0.40% and in 2 weeks with 0.37% chromium octoate cure catalyst. Several 1-lb. propellant mixes containing 14.5% binder were processed and cured successfully at 26C (79F). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1970
- Accession Number
- AD0875990
Entities
People
- C. Weis
- H. Gilbert
- R. E. Foscante
- T. Comfort
- W. Wiegand
Organizations
- MRIGlobal