Mixed polyester resin and preparation method and powder coating thereof
A polyester resin and powder coating technology, applied in polyester coatings, powder coatings, coatings, etc., can solve the problems of poor coating film performance and darker resin color, and achieve stable gloss, clear and full surface, and smooth flow flat excellent effect
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[0024] Example 1
[0025] (1) The first stage: Raise the temperature of the reactor kettle to 85°C, turn on the stirring, and sequentially put in the formula amount of alcohol, acid, PET chips and esterification catalyst. After feeding, close the reactor and slowly raise the temperature to 245°C to maintain the reaction When the top temperature of the reactor drops below 60℃, the acid value is 18mgKOH / g by sampling;
[0026] (2) The second stage: Decrease the temperature of the kettle to 230°C, continue the reaction for 1.5 hours at a vacuum of -0.098MPa, and take a sample to detect the acid value of 9mgKOH / g;
[0027] (3) The third stage: firstly lower the temperature of the kettle to 210°C and put in trimellitic anhydride, continue to react for 100 minutes, then lower the temperature to 190°C and put in the curing accelerator, continue the reaction for 30 minutes, and take samples to check the acid value and viscosity.
Example Embodiment
[0028] Example 2
[0029] (1) The first stage: Raise the temperature of the reactor kettle to 90°C, turn on the stirring, and sequentially put in the formula amount of alcohol, acid, PET chips and esterification catalyst. After feeding, close the reactor and slowly raise the temperature to 246°C to maintain the reaction When the top temperature of the reactor drops below 60℃, the acid value of the sample is 17mgKOH / g;
[0030] (2) The second stage: Decrease the temperature of the kettle to 232°C, continue the reaction for 1.3 hours at a vacuum of -0.097MPa, and take a sample to detect the acid value of 10mgKOH / g;
[0031] (3) The third stage: firstly lower the temperature of the kettle to 215°C and put in trimellitic anhydride, continue to react for 90 minutes, then lower the temperature to 195°C and put in the curing accelerator, continue to react for 25 minutes, and take samples to check the acid value and viscosity.
Example Embodiment
[0032] Example 3
[0033] (1) The first stage: Raise the temperature of the reactor kettle to 90°C, turn on the stirring, and sequentially put in the formula amount of alcohol, acid, PET chips and esterification catalyst. After feeding, close the reactor and slowly raise the temperature to 247°C to maintain the reaction When the top temperature of the reactor drops below 60℃, the acid value of the sample is 19mgKOH / g;
[0034] (2) The second stage: Decrease the temperature of the kettle to 233°C, continue the reaction for 1.2 hours at a vacuum of -0.096MPa, and sample to detect the acid value of 10mgKOH / g;
[0035] (3) The third stage: firstly lower the temperature of the kettle to 220°C and put in trimellitic anhydride, continue to react for 80 minutes, then lower the temperature to 200°C and put in the curing accelerator, continue the reaction for 27 minutes, and take samples to check the acid value and viscosity.
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