SYNTHESIS AND STUDY OF PROPERTIES OF ELASTOMER-CONTAINING COMPOSITIONS BASED ON COOLIGOMERS OF POLYOXYPROPYLENE GLYCOL AND 4,4'-DIPHENYL-METHANE DIISOCYANATE

Abstract

A study was conducted in order to obtain a highly adhesive and highly elastic coating of the adhesive and sealing composition. Cooligomers of polyoxypropylene glycol and 4,4'-diphenyl-methane diisocyanate were obtained and their copolycondensation kinetics was studied. It has been established that the urethane formation reaction proceeds through a migration polymerization based on the addition of mobile hydrogen atoms of the polyester to the nitrogen atom. The morphology of the synthesized cooligomers was studied by IR spectroscopy. It was shown that the combination of cooligomer with butyl rubber (a copolymer of isobutylene and isoprene) increases the elasticity of the system, relieves shrinkage and increases the thermal and chemical resistance. In order to obtain an adhesive and highly elastic composite material, we studied mixtures of polyurethane cooligomer with butyl rubber (BK), which has high rates of heat resistance, elasticity and chemical resistance in aggressive environments. It was shown that when polyurethane copolymer is mixed with butyl rubber, a polymer system is formed, the macromolecules of which mechanically interact with each other to form so-called interpenetrating grids. This composition is also the very stable in aggressive environments, which makes its application promising. Comparison of the data of differential thermal analysis of the cooligomer and the composition of cooligomer + butyl rubber shows that the resulting composition is thermally more stable than the cooligomer. An important scientific and technical problem of improving the quality of adhesive compositions has been solved. Because of the study, recommendations have been developed for improving the properties of adhesive compositions that are competitive with existing analogues, according to the formulation of the structure, technology for the preparation and use of adhesive compositions. The compositions obtained in this way can be used in the production of polymer products for the petroleum and engineering industries.