Layered construction of composite interceptor motor cases, etc. (USH0000219)
Original Publication Date: 1987-Feb-03
Included in the Prior Art Database: 2008-Mar-23
US Statutory Invention Registration (SIRs)
Related DocumentsPatent/Patent Application:
Improved method of manufacturing composite rocket motor cases and laminated tructures is disclosed which includes a layered procedure wherein a high percentage of a highly flexibilized, low-modulus epoxy blend of a resin composition is employed in the matrix of the innermost layer section with a subsequent, gradual addition of a toughened (or hard) high-modulus resin to the filament impregnating bath during the filament winding process to achieve a higher-modulus resin composition in the intervening layers with the highest modulus resin composition being in the outermost layer section to achieve a gradation in mechanical properties to mechanical behavior. The resin composition employed to impregnate a fiber material as the fiber material is passed through a filament impregnating bath is comprised of a four component composition wherein a first component is selected from diglycidyl ether of bisphenol A and a thermoplastic phenol-formaldehyde resin in parts by weight from about 25 to about 95, a second component is epoxidized dimer of oleic acid in parts by weight from about 75 to about 5, a third component is a reactive plasticizer of butanediol diglycidyl ether in parts by weight of about 25, and a fourth component is an amine crosslinking agent or curative in parts by weight of about 20. The fourth component consists of a mixture of 65 weight percent 4,4'-diaminodiphenylmethane, 10 weight percent of triamines, and 25 weight percent of polyamines.