Weather resistant polyester resin with excellent water-boiling resisting performance and method for preparing same
A polyester resin, weather-resistant technology, applied in the field of polyester resin, can solve the problem of few patents on polyester resin and so on
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Some specific examples are enumerated below to illustrate the present invention. Table 1 shows examples of polyester resins, and A to F show comparative examples of different monomers and process combinations. In a 10-liter reactor, add neopentyl glycol, 2-methyl-1,3-propanediol, ethylene glycol, 1,4-cyclohexanedimethanol, trimethylol Propane, heat up until the material melts; then add terephthalic acid, adipic acid, and butyl tin oxide in sequence, and continue to heat up the reaction with nitrogen gas. Esterification water begins to form and distill at around 180°C, and then gradually heat up to 250°C. React for 5-10 hours until 95% of the esterification water is discharged, the acid value reaches 6-23 mgKOH / g, add acidolysis agent, react for 3-5 hours, the acid value reaches 40-50 mgKOH / g, vacuum polycondensation for about 1-4 hours , the acid value reaches 28 ~ 36mgKOH / g, the reaction can be stopped.
Acid value: 28~36mgKOH / g; glass transition temperature: 60~75℃; softenin...
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