Method for determining hydroxyl value of vegetable oil-based and derivative-based polyols thereof

The invention belongs to the technical field of polyol hydroxyl value determination, and particularly relates to a method for determining a polyol hydroxyl value of vegetable oil-based and derivative-based polyols thereof. According to the method for determining the hydroxyl value of the plant oil-based and derivative-based polyol, firstly, an epoxy bond which is not subjected to ring opening in a to-be-determined polyol sample is completely destroyed through epoxy value determination, and the hydroxyl value change value caused by the epoxy bond part when the hydroxyl value of the sample is determined by an acylation method is calculated according to the epoxy value; the partial hydroxyl change value is deducted from the total hydroxyl value measured by the open-loop sample of the polyol, so that the influence of epoxy bonds on the hydroxyl value test result of the sample is effectively eliminated, and the accuracy of measuring the hydroxyl value of the vegetable oil-based polyol sample ...