Investigation of the properties of the composition obtained based on mixtures of polyvinyl chloride

Abstract

The properties of mixtures and vulcanizates of polyvinyl chloride (PVC) and ethylene-propylene elastomers (SKEPT-40) with functional group polymers have been studied and it appears that the effectiveness of the application of functional group polymers (FQP) is characterized by the improvement of the complex properties of vulcanizates. As shown, among the FQP, the industrial scale production of PVC and the low cost of its use in the purchase of rubber mixtures based on Synthetic rubber ethylene propylene terpolymer (SREPT) have been developed. In this regard, new composition mixtures were obtained by replacing the main polymers in rubber mixtures with 5÷30 mass parts of PVC based on SREPT. The physical and mechanical properties of their technological and vulcanizates were studied. Experiments show that the sol-fraction and durability of vulcanizate in gasoline, gasoline-benzene (3:1) mixture, and meta xylol decrease with the increase of PVC content. The decrease in the sol fraction of the vulcanizate can be explained by the low swelling of PVC in the above solvents. Therefore, a vulcanizate based on a PVC blend of synthetic rubber ethylene-propylene terpolymer has a higher oil and gasoline resistance than a vulcanizate based on unmodified EPDM. It became known that 10 wt. parts in SREPT. When PVC is included, the degree of swelling of the vulcanizate is reduced by 20% in gasoline, in the mixture of gasoline-benzene (3:1), M-xylene, and "Avtol" oil, compared to the vulcanizate based on SREPT 30 mass parts and when included, the degree of swelling of the vulcanizate decreases by 2.7 times in gasoline, 2.3 times in gasoline-benzene (3:1) mixture, and 3.2 times in "Avtol-10" oil.