Carboxyl-terminated polyester resin for hammer grain powder coating and preparation method thereof
A technology of carboxyl-terminated polyester and powder coatings, which is applied in powder coatings, fireproof coatings, epoxy resin coatings, etc., and can solve the problem of single process, affecting the coating effect, service life and aesthetics, and the preparation process of carboxyl-terminated polyester resin Complicated issues
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Embodiment 1
[0027] Mix neopentyl glycol, polyethyl silicone resin (weight-average molecular weight: 10,000) and stannous chloride, add terephthalic acid and adipic acid after melting, and then, under a nitrogen atmosphere, start from room temperature at 5°C / min The heating rate was raised to 180°C; then, the temperature was raised to 235°C at a heating rate of 10°C / min, and maintained at 235°C for 12h (the acid value of the system during the heat treatment was 10mgKOH / g); adding the 1,4-cyclo After hexanedicarboxylic acid, keep the temperature of the system at 235°C for 4 hours (the acid value of the system is 36 mgKOH / g), then vacuumize the system and perform polycondensation for 4 hours (the acid value of the system is 30 mgKOH / g); Carboxyl-terminated polyester resin for grain powder coatings, denoted as A1;
[0028] Among them, the weight ratio of neopentyl glycol, polyethyl silicone resin, terephthalic acid, adipic acid, 1,4-cyclohexanedicarboxylic acid and stannous chloride is 1:0.2:...
Embodiment 2
[0030] Mix 2-methyl-1,3-propanediol, polymethyl silicone resin (weight average molecular weight: 20,000) and dibutyltin dilaurate, add isophthalic acid and 1,4-cyclohexane after melting After diformic acid, under a nitrogen atmosphere, the temperature was raised from room temperature at a rate of 7 °C / min to 185 °C; then, the temperature was raised to 245 °C at a rate of 12 °C / min, and maintained at 245 °C for 10 h (the acid in the system during heat treatment Value is 20mgKOH / g); after adding trimellitic anhydride, keep the system temperature at 245°C for 3h (system acid value is 38mgKOH / g), vacuumize the system and polycondensate for 5h (system acid value is 32mgKOH / g); finally , vacuum polycondensation into carboxyl-terminated polyester resin for hammer grain powder coating; denoted as A2;
[0031] Among them, the weight ratio of 2-methyl-1,3-propanediol, polymethyl silicone resin, isophthalic acid, 1,4-cyclohexanedicarboxylic acid, trimellitic anhydride and dibutyltin dila...
Embodiment 3
[0033] Mix and melt ethylene glycol, polymethyl silicone resin (weight average molecular weight: 10,000) and zinc oxide, add terephthalic acid and adipic acid, and then raise the temperature from room temperature at a rate of 8°C / min under a nitrogen atmosphere to 190°C; then, heat up to 255°C at a heating rate of 15°C / min, and maintain at 255°C for 8h (the acid value of the system during heat treatment is 25mgKOH / g); after adding the trimellitic anhydride, the temperature of the system is maintained at 255°C After maintaining the temperature for 2 hours (the acid value of the system is 40 mgKOH / g), the system is evacuated and polycondensed for 6 hours (the acid value of the system is 35 mgKOH / g); finally, the carboxyl-terminated polyester resin for hammer grain powder coating is formed by vacuum polycondensation; Make A3.
[0034] Wherein, the weight ratio of ethylene glycol, polymethyl silicone resin, terephthalic acid, adipic acid, trimellitic anhydride and zinc oxide is 1:...
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