Polyester resin for anti-yellowing thermosetting powder coating and preparation method of polyester resin
A technology of thermosetting powder and polyester resin, applied in the field of polyester resin, can solve the problems of shortened service life and no water resistance, and achieve the effects of increasing heat resistance, increasing water resistance, and increasing resistance to pyrolysis.
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Embodiment 1
[0034] S1: Preparation of phosphite / porous TPU: (1) stirring and dissolving potassium hydroxide in an aqueous solution, adding ethanol solution and mixing evenly to obtain an ethanol-alkali aqueous solution. Add the TPU waste to the ethanol-alkali aqueous solution, set the stirring speed to 100rmp, the reaction temperature to 80°C, and the hydrolysis time to 30 minutes, filter, wash with ethanol solution, and dry; circulate the hydrolysis-drying process 3 times to obtain porous TPU, Standby; (2) under the ice-water bath, add the phosphorus trichloride, triethylamine, tetrahydrofuran that take by weighing in the reaction flask successively, set up nitrogen atmosphere, mix reactant evenly under stirring speed is 150rmp; Slowly add 2 , 4-di-tert-butylphenol solution, set the reaction temperature to 0°C and react for 24 hours. After the reaction precipitated, extract the supernatant; remove the solvent by distillation under reduced pressure to obtain the phosphite intermediate, and...
Embodiment 2
[0041] S1: Preparation of phosphite / porous TPU: (1) stirring and dissolving potassium hydroxide in an aqueous solution, adding ethanol solution and mixing evenly to obtain an ethanol-alkali aqueous solution. Add the TPU waste to the ethanol-alkali aqueous solution, set the stirring speed to 150rmp, the reaction temperature to 90°C, and the hydrolysis time to 40 minutes, filter, wash with ethanol solution, and dry; cycle the hydrolysis-drying process 3 times to obtain porous TPU, Standby; (2) under the ice-water bath, add the phosphorus trichloride, triethylamine, tetrahydrofuran that take by weighing in the reaction flask successively, set up nitrogen atmosphere, mix reactant evenly under stirring speed is 200rmp; Slowly add 2 , 4-di-tert-butylphenol solution, set the reaction temperature to 0°C and react for 24 hours. After the reaction precipitated, extract the supernatant; remove the solvent by distillation under reduced pressure to obtain the phosphite intermediate, and set...
Embodiment 3
[0048] S1: Preparation of phosphite / porous TPU: (1) stirring and dissolving potassium hydroxide in an aqueous solution, adding ethanol solution and mixing evenly to obtain an ethanol-alkali aqueous solution. Add the TPU waste to the ethanol-alkali aqueous solution, set the stirring speed to 100-150rmp, the reaction temperature to 85°C, and the hydrolysis time to 35 minutes, filter, wash with ethanol solution, and dry; circulate the hydrolysis-drying process 3 times to obtain porous TPU, standby; (2) under the ice-water bath, add the phosphorus trichloride, triethylamine, tetrahydrofuran that take by weighing in the reaction flask successively, set up nitrogen atmosphere, mix the reactants evenly under the stirring speed of 180rmp; Slowly drop Add 2,4-di-tert-butylphenol solution, set the reaction temperature to 0°C and react for 24 hours. After the reaction precipitates, extract to obtain the supernatant; distill the solvent under reduced pressure to obtain the phosphite interm...
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