What catalyst is used for polyester polyol
Polyester polyols, organic substances, are usually formed by the condensation (or transesterification) of organic dicarboxylic acids (anhydrides or esters) and polyols (including diols) or the polymerization of lactones and polyols. The dibasic acid includes phthalic acid or phthalic anhydride or its ester, adipic acid, halogenated phthalic acid and the like. Polyols include ethylene glycol, propylene glycol, diethylene glycol, trimethylolpropane, pentaerythritol and the like. Different varieties of polyester polyols have different properties due to different types or different preparation processes. Several important indicators for polyester polyols are hydroxyl value, acid value, moisture, viscosity, molecular weight, density and chromaticity, etc. . Characteristics and uses of polyester polyols: Polyester polyurethane contains more polar groups such as ester groups and amino groups in the molecule, and has strong cohesive strength and adhesion, and has high strength and wear resistance.