USE OF MECHANICAL ACTIVATION OF POLYVINYL CHLORIDE IN THE PRODUCTION OF TENT MATERIALS

Abstract

Physical and mechanical characteristics of tent materials depend on the quality of raw materials, which varies depending on its mechanical processing. A mathematical model of the process of dispersed materials activation is proposed, which describes the kinetics of change both during processing and dur-ing the further storage of the product of one or a number of factors characterizing physicochemical prop-erties of the material. The process of mechanical activation and verification of the adequacy of mathe-matical model proposed was carried out on emulsion polyvinyl chloride in a disintegrator unit. When processing PVC-E in a disintegrator, physicochemical processes take place, leading both to an increase and to a decrease in the viscosity of PVC-E solutions. The processes of dehydrochlorination breaking molecules, lead to a decrease in viscosity, and the formation of organic acids and copolymers - to in-crease. And these processes are irreversible. Conformational transformations of macromolecules con-tribute to the growth of viscosity of PVC-E solutions and are reversible. The adequacy of the proposed mathematical model describing the process of mechanical activation of dispersed materials is shown on the example of viscosity change of PVC-E solutions. Calculations show that increasing the loading speed, it is possible to maximize viscosity of PVC-E solutions in the minimum number of treatment cycles. If the number of processing cycles is more than one, then the rate of each subsequent loading should increase. The use of PVC-E, treated once in a disintegrator at a speed of 140 m / s, allows increasing physical and mechanical parameters of tent materials.