Preparation of Urethane Adhesives. Revision.
ALLIED BENDIX AEROSPACE KANSAS CITY MO
Pagination or Media Count:
Both the Union Carbide Corporation and the Lawrence Livermore Laboratory LLL are continuing work on urethane adhesives to replace the Adiprene L-100MOCA system E. I. du Pont de Nemours Company. Several alternate adhesives are in the final stages of development. Two prepolymers, Halthane 73 and Halthane 87, used in these adhesive systems, were scaled-up from laboratory synthesis to pilot plant production. Several physical properties of the prepolymers were determined. Physical properties of the prepolymers prepared in the laboratory are very similar to prepolymers prepared in the pilot plant. The shear storage modulus of the cured adhesives was measured at various temperatures. The Halthane 73 adhesives have glass transition temperatures of -30 deg to -50 deg C with almost constant shear modulus from -10 deg to 120 deg C. Halthane 87 adhesive has a lower glass transition temperature of -60 deg to -70 deg C, but does not have as constant a shear modulus at higher temperatures as tne Halthane 73 adhesive. Nineteen liter quantities of Halthane prepolymers required for additional test programs were prepared in the pilot plant and shipped to LLL. jg p7
- Adhesives, Seals and Binders
- Physical Chemistry
- Polymer Chemistry