Flexible polymer type modified epoxidized soybean oil polymer plasticizer as well as preparation method and application thereof

The invention discloses a flexible polymer type modified epoxidized soybean oil polymer plasticizer as well as a preparation method and application thereof, the preparation method of the flexible polymer type modified epoxidized soybean oil polymer plasticizer is characterized in that epoxidized soybean oil rosin ester and a long-carbon-chain bifunctional epoxy compound react in a nitrogen atmosphere, the reaction temperature is 105-130 DEG C, the reaction time is 2-3 hours, and the flexible polymer type modified epoxidized soybean oil polymer plasticizer is obtained. The reaction time is 1.5 to 3 hours. When the plasticizer is prepared, no solvent is needed, the activity of raw materials is high, about 100% conversion can be achieved, treatment such as purification is not needed, and the raw materials are wide in source, low in cost and renewable; the plasticizer has the advantages of favorable plasticization performance on polyvinyl chloride, low dosage, favorable plasticization effect, favorable stability