Low acetaldehyde copolyester for bottles and preparation method thereof

• Main Author: WANG HUIWU
• Format: Patent
• Language: Chinese; English
• Published: 10.11.2010
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention discloses low acetaldehyde copolyester for bottles and a preparation method thereof. The copolyester is prepared by adopting PET production equipment and processes in the prior art, using dicarboxylic acid and dihydric alcohol to form a basic repeated unit, introducing 0 to 3 weight percent of third monomer, preferably 1.5 to 2.3 weight percent of isophthalic acid and 1 to 3 weight percent of fourth monomer, preferably 1.3 to 2.3 weight percent of diglycol to perform esterification reaction and adding toner, stabilizer, hindered phenol antioxidant and catalyst before condensation polymerization reaction when the esterification conversion rate reach over 96 percent. The copolyester has excellent liquidity. The liquidity of the polyester melt is greatly improved by optimizing a formula and adjusting a polymerization process, the thermal stabilizer and the antioxidant are added at the same time, and the content of acetaldehyde (AA) produced by thermal degradation and thermo-oxidative degradation du