SYNTHESIS METHOD OF HIGH FUNCTIONAL POLYOL USING THE CASTOR OIL AND POLYOL AND POLYURETHANE PRODUCED BY THAT METHOD

摘要

A method for preparing high-functional bio-degradable polyol by using castor oil is provided to obtain a target polyol from which unreacted alcohol is removed and to realize eco-friendly characteristics by using vegetable oil. A method for preparing high-functional bio-degradable polyol by using castor oil comprises the steps of: (i) agitating a polyhydric alcohol or amine with a catalyst to remove water and adding castor thereto to perform transesterification; (ii) adding a polyhydric alcohol to the reaction mixture of step (i) to perform additional transesterification; and (iii) adding a polyhydric acid and catalyst to the reaction mixture of step (ii) to perform esterification. In step (i), the polyhydric alcohol is at least one selected from pentaerythritol, dipentaerythritol, alpha-methylglucoside, xylitol, sorbitol and sucrose; the polyhydric amine is at lest one selected from ethylenediamine, diethylene triamine, triethanolamine, ortho-toluene diamine, diphenylmethanediamine and diethanol amine; and the catalyst for transesterification is selected from KOH, NaOH, CH3ONa and CH3OK. In step (ii), the polyhydric alcohol is at least one selected from ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, glycerine and trimethylolpropane. In step (iii), the polyhydric acid is at least one selected from adipic acid, glutaric acid, succinic acid, sebacic acid, azelaic acid, isophthalic acid, phthalic anhydride and terephthalic acid; and the catalyst for esterification is selected from organotitanium catalysts including tetraisopropyl titanate(TPT), tetra-n-butyl titanate(TBT) and tetra (2-ethyl-hexyl)titanate(TOT), and organotin catalysts including tributyltin(TBT) and tetramethyl tin(TMT).