Polyester polyols are an important chemical raw material, mainly used for the production of polyurethane materials. Aliphatic (mostly referring to diacid polyester) polyester diols are mostly used for the production of castable polyurethane elastomers, thermoplastic polyurethane elastomers, microporous polyurethane soles, PU leather resins, polyurethane adhesives, polyurethane inks and color pastes, fabric coatings, etc. Aromatic polyester polyols refer to polyester polyols produced by polymerizing of phthalic anhydride with diols or triols. Due to the presence of rigid benzene ring groups in the molecules, they can play a reinforcing role, and their prices are cheaper than diacid polyester. Therefore, ethylene dicarboxylic acid polyester can be used to replace or partially replace the aromatic polyester polyols for hard foam, adhesives and elastomers. They have the effect of increasing the strength, heat resistance and reducing costs of the products. In summary, polyester polyols are the key raw materials for the production of rigid polyurethane foams which are used in building insulation materials and refrigeration equipment. At the same time, they can also be used in coatings and adhesives, as well as textiles and leather. The properties of polyester polyols can be optimized by adjusting their molecular weight and functionality to meet the requirements of various applications.
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