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Earlier we reported (ref. 1) on the development of stabilising and plasticising composites for polymers based on chloroparaffins. We found that the use of epoxidised oils has a favourable effect on the properties of chloroparaffins, the properties of the Sinstad composite, and, ultimately, on products manufactured from polyvinyl chloride (PVC). For the Volgograd region, we chose to use sunflower oil as epoxidised vegetable oil. We studied the possibility of its epoxidation (ref. 2) and showed that the most important quality criteria of the feedstock are the acid and iodine numbers. The process of preparing the oil for epoxidation includes the removal of free fatty acids from it by treatment with an alkaline solution. In this case we established that this treatment can be carried out both with the raw oil and with its toluene solution, which is used in the epoxidation procedure. With purification of the toluene solution of the oil, the oil/toluene ratio met the requirements of laboratory oil epoxidation technology. In effectiveness, this method does not differ substantially from purification of the oil (ref. 2), and the acid number was also reduced considerably. However, both the oil and its toluene solution have low transparency before purification, which, according to our observations, has an adverse effect on epoxidation. We found that, as a result of purification, the degree of transparency of sunflower oil can be improved at the same time. Thus, in our experiments, the transparency increased from 4 fem before purification to 1.8 fem after purification. The results of purification of the oil are given in Table 1.

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