Accession Number : ADD011527

Title :   Rubber Modified Epoxy Adhesive.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Crabtree,D J ; Park,E Y

Report Date : 09 Oct 1984

Pagination or Media Count : 5

Abstract : A rubber-modified epoxy adhesive and the method of making the same is disclosed for use in bonding graphite-epoxy composite structures. The adhesive comprises a two-part formulation, one part being a reaction product of a carboxyl terminated reactive liquid rubber pre-reacted with a bisphenol. A epoxy resin so that linear epoxy-rubber chains are developed. The second part of the adhesive is an amine curing agent. One effective example of the adhesive is formulated as follows: approximately 4 parts by weight of the bisphenol A epoxy resin is mixed per part of a carboxyl terminated butadiene acrylonitrile rubber and heated to 170 deg C. At 160 deg C., a catalyst of approximately 0.01 parts by weight of triphenyl phosphene per part of the rubber is added and the mixture stirred for one hour at 170 deg - 175 deg C. to provide the reaction product. After cooling to room temperature, the reaction product may be packaged in pre-measured quantities for mixture, when required, with a curing agent of cycloaliphatic diamine at a ratio of approximately 4:1.

Descriptors :   *Patents, *Adhesives, Epoxy resins, Rubber, Amines, Curing agents, Catalysts, Heat treatment, Mixtures, Adhesive bonding, Graphited materials, Epoxy composites, Composite structures, Repair

Subject Categories : Adhesives, Seals and Binders

Distribution Statement : APPROVED FOR PUBLIC RELEASE