The mechanism of desorption of a plasticizer from polyvinyl chloride and its effect on the extraction rate, which decreases after desorption of a certain proportion of the plasticizer, have been studied. Parameters of the transfer of plasticizer from polyvinyl chloride to the environment reflecting the rate and conditions for decreasing the rate of desorption have been proposed. A method for graphical determination of the plasticizer proportion, desorption of which leads to a significant decrease in the extraction rate, has been considered. An approach to substantiate a method for reducing the rate of desorption of plasticizers taking into account the limiting stage of the process has been proposed.
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