High-functionality polyester polyol and preparation method thereof

Abstract

The invention relates to high-functionality polyester polyol and a preparation method thereof. The polyol is prepared from 400-450 parts of PTA oxidation residue, 180-210 parts of glycerol, 80-140 parts of diglycol, 20-30 parts of pentaerythritol, 50-90 parts of oleic acid and 1-2 parts of catalyst. The preparation method comprises the following steps of: extracting various raw materials according to the proportion, sending the raw materials into a reaction kettle, heating, stirring and introducing nitrogen gas; evaporating all water of the raw materials in the kettle; cooling after evaporating all water, and stopping the introduction of nitrogen gas; heating and vacuumizing the kettle to form high temperature and high vacuum; polymerizing all raw materials at high temperature and in high vacuum, and greatly increasing the molecular weight of polyester; and discharging to obtain the finished product after various indexes of the molecular weight of polyester are measured to reach specified values. The high-functionality polyester polyol has the advantages of high wear resistance, strength, stability, heat resistance, aging resistance and the like.

Description

technical field

[0001] The invention relates to the technical field of polyester polyols, in particular to high-functionality polyester polyols and a preparation method thereof. Background technique

[0002] Polyurethane resin has the characteristics of foamability, elasticity, wear resistance, adhesion, low temperature resistance, solvent resistance and biological aging resistance, so it has a wide range of uses. It is a rapidly developing polymer synthetic material. The polyurethane industry has formed a relatively large scale of production.

[0003] my country's polyurethane industry started in the late 1950s and has a history of more than 50 years. As one of the main raw materials of polyurethane, the domestic demand for polyester polyol is also expanding. In recent years, polyester polyols have been produced domestically using PTA residues and PTA oxidation residues as raw materials. It has been affirmed and praised by the majority of users for its low price and super...