Manufacturing method of polyester polyol at low temperature using perovskite catalyst

The present invention (1) perovskite material is a metal precursor and citric acid's catalyst a mixture of (citric acid) to afford a compound of the gel (gel phase); (2) obtaining a perovskite catalyst represented by the following general formula (1) by firing the compound on the resulting gel at a temperature of 600 to 1000 ℃; (3) a polyvalent carboxylic acid to melt at from 1 to 100 parts by weight and a molecular weight of 100 to 150 ℃ by mixing 40 to 55 000 of the polyhydric alcohol of 1 to 500 parts by weight: and (4) a page lobe obtained above in the molten mixture Sky poured from 0.0001 to 10.0 parts by weight, based on the bit molten mixture of the catalyst reacting at 160 to 210 ℃; discloses a production method of a polyester polyol comprising a. Production method of the polyester polyols according to the present invention can lower the reaction temperature by use of a specific perovskite catalyst, thus providing the effect to improve the color increase the recovery rate of the polyester polyol. Formula 1 ABO (Note that the formula A and B as the element are not equal to each other, each of which is one selected from La, Mo, and Mn.)