TMXDI, curing agent for hydroxy terminated propellant binders

Details TMXDI, curing agent for hydroxy terminated propellant binders TMXDI, curing agent for hydroxy terminated propellant binders

1989-09-25

1990-04-03

Lechert, Jr., Stephen J.

Explosive and thermic compositions or charges

Structure or arrangement of component or product

Solid particles dispersed in solid solution or matrix

149 42, 149 44, 149 76, C06F 9510

Patent

active

049137530

ABSTRACT:
The compound m-tetramethylxylene diisocyanate (m-TMXDI), is a domestically, commercially produced aliphatic diisocyanate process produced by a non-phosgenation process for the polyurethane industry with suggested applications in reaction injection molding, surface coatings, and in soft polyurethanes with specialty applications (e.g. as solar cell encapsulants). Applicant's discovery relates to the use of m-TMXDI in an amount from about 0.5 to about 2.0 weight percent for curing a composite rocket propellant composition comprising other ingredients in weight percentages of a high solids loading of aluminum metal fuel (0-20%) and ammonium perchlorate oxidizer (65-88%), hydroxy-terminated polymer binder (7-15%) with antioxidant (0.15 to 1.0% of polymer), plasticizer (0-4%), burn rate catalyst (0.05-6%), and quick cure catalyst system of about 0.02% maleic acid (MA) or maleic anhydride (MAN) and 0.02% triphenyl bismuthine (TPB).
The unexpected increase in pot life of m-TMXDI cured propellants as compared with the commonly used curing agent isophorone diisocyanate (IPDI) with less sensitivity to temperature change makes m-TMXDI a preferred curing and crosslinking agent for composite rocket propellant. Additionally, mechanical properties measured at -40.degree. C., 25.degree. C., and 60.degree. C. are equal to or superior for those values of stress (psi), strain (maximum/break), and modulus measured for IPDI cured composite propellant composition as control.

REFERENCES:
patent: 4019933 (1977-04-01), Cuksee et al.
patent: 4042619 (1977-08-01), Miegel
patent: 4090893 (1978-05-01), Cocksee et al.
patent: 4410470 (1983-10-01), Sayles
patent: 4597811 (1986-07-01), Ducote
patent: 4655858 (1987-04-01), Sayles
"M-- 36and P-TMXDI: Two New Isocyanates for the Polyurethane Industry", by olker D. Arendt, Raymond E. Logan, and Robert Saxon, Journal of Cellular Plastics, Nov./Dec. 1982.

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