Modified polyester, preparation method thereof, and modified polyester film preparation method
A modified polyester and polyester technology, applied in the field of polyester, can solve the problems of weak hydroxyl activity, low reactivity, difficult polymerization of modified polyester, etc., and achieve fast polymerization speed, good esterification effect, and not easy to evaporate Effect
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Embodiment 1
[0024] Example 1: 350 grams of terephthalic acid, 130 grams of spiroglycol, 22 grams of NPG, 170 grams of ethylene glycol, 0.0175 grams of monobutyltin oxide were added to a 2L reactor, and the esterification temperature was 200°C to 260°C. Esterification under the esterification pressure (gauge pressure) of 2.5 MPa. When the water output reaches the theoretical value, the esterification is terminated, released to normal pressure, 0.0261 g of phosphoric acid is added, and stirring is continued for 10 minutes. After adding 0.13 g of ethylene glycol antimony, gradually Heating up and turning into low vacuum stage. After low vacuum time is about 45 minutes, it enters high vacuum polycondensation stage (vacuum <100Pa), polycondensation temperature is 270℃~290℃, and the material is discharged when the stirring power reaches the rated value. The synthesized modified polyester glass The transition temperature is 100.3°C, the intrinsic viscosity is 0.762dL / g, the carboxyl group is 38mo...
Embodiment 2
[0026] Example 2: 350 grams of terephthalic acid, 160 grams of spiroglycol, 19 grams of NPG, 160 grams of ethylene glycol, 0.070 grams of monobutyltin oxide were added to a 2L reactor, and the esterification temperature was 200°C to 260°C. Esterification under the esterification pressure (gauge pressure) of 2.5 MPa. When the water output reaches the theoretical value, the esterification is terminated, released to normal pressure, 0.0175 grams of phosphoric acid is added, and stirring is continued for 10 minutes. After adding 0.13 grams of ethylene glycol antimony, gradually Heating up and turning into low vacuum stage. After low vacuum time is about 45 minutes, it enters high vacuum polycondensation stage (vacuum <100Pa), polycondensation temperature is 270℃~290℃, and the material is discharged when the stirring power reaches the rated value. The synthesized modified polyester glass The transition temperature is 105.2°C, the intrinsic viscosity is 0.751dL / g, the carboxyl end gr...
Embodiment 3
[0028] Example 3: 350 grams of terephthalic acid, 200 grams of spiroglycol, 10 grams of NPG, 160 grams of ethylene glycol, 0.044 grams of monobutyltin oxide were added to a 2L reactor, and the esterification temperature was 200°C to 260°C. Esterification under esterification pressure (gauge pressure) 2.5MPa, when the water output reaches the theoretical value, end the esterification, release to normal pressure, add 0.035 grams of phosphoric acid, continue stirring for 10 minutes, add 0.15 grams of ethylene glycol antimony, gradually Heating up and turning into low vacuum stage. After low vacuum time is about 45 minutes, it enters high vacuum polycondensation stage (vacuum <100Pa), polycondensation temperature is 270℃~290℃, and the material is discharged when the stirring power reaches the rated value. The synthesized modified polyester glass The transition temperature is 110°C, the intrinsic viscosity is 0.699dL / g, the carboxyl end group is 41mol / t, and the color value (L / a / b) ...
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