| abstract |
The invention discloses PEPA, the application of its preparation method and the polyalcohol.In some respects, the polyalcohol comes from thermoplastic polyester or aromatic polyvalent acid source, dihydric alcohol and lignin, tannin or its mixture comprising repeat unit.Alternatively, the polyalcohol includes the repeat unit of hydrophobe.The polyalcohol is made up of one or more steps；In some respects, thermoplastic polyester or aromatic polyvalent acid source and dihydric alcohol react first, are then reacted again with lignin, tannin or its mixture.The present invention can manufacture the high polyalcohol for reclaiming content and having satisfactory performance, for preparing the polyurethane products including two component polyurethane coating.Polyalcohol of the present invention provides sustainable substitute for the polyalcohol of biological or petrochemistry base. |