A kind of aqueous hyperbranched polyester-based epoxy curing agent and preparation method thereof
A polyester-based epoxy and hyperbranched polyester technology, applied in the direction of epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of poor water resistance, insufficient long-term anti-corrosion performance, brittle coating film, etc., and achieve stable Good performance, good toughness and high adaptability
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Embodiment 1
[0029] 26g of carboxyl-terminated hyperbranched resin was added to a 250mL three-necked flask equipped with a stirrer and a condenser, 6g of propylene glycol methyl ether acetate was added, and the oil bath was heated to 90° C. to dissolve the resin. 0.13 g of single-end epoxy polydimethylsiloxane (epoxy value n=0.025) was added, and boron trifluoride ether was added, stirred evenly, heated to 110° C., and kept for reaction for 5 hours. Cool to room temperature, add 4 g of triethylamine to neutralize the reaction for 30 minutes, and then add deionized water at high speed (6000-7500 rpm) to disperse for 30 minutes to obtain a colorless and transparent water dispersion with a solid content of 55%.
Embodiment 2
[0031] 26g of carboxyl-terminated hyperbranched resin was added to a 250mL three-necked flask equipped with a stirrer and a condenser, 6g of propylene glycol methyl ether acetate was added, and the oil bath was heated to 90° C. to dissolve the resin. Then add 0.26g of single-end epoxy polydimethylsiloxane (epoxy value n=0.025), stir evenly, add boron trifluoride ether, then heat up to 110°C, and keep reacting for 4-5h. Cool to room temperature, add 4 g of triethylamine to neutralize the reaction for 30 minutes, and then add deionized water at high speed (6000-7500 rpm) to disperse for 30 minutes to obtain a colorless and transparent water dispersion with a solid content of 55%.
Embodiment 3
[0033] 26g of carboxyl-terminated hyperbranched resin was added to a 250mL three-necked flask equipped with a stirrer and a condenser, 6g of propylene glycol methyl ether acetate was added, and the oil bath was heated to 90° C. to dissolve the resin. Then add 0.52 g of single-end epoxy polydimethylsiloxane (epoxy value n=0.025), stir evenly, then add boron trifluoride ether, then heat up to 110° C., and keep reacting for 4-5 hours. Cool to room temperature, add 4 g of triethylamine to neutralize the reaction for 30 minutes, and then add deionized water at high speed (6000-7500 rpm) to disperse for 30 minutes to obtain a colorless and transparent water dispersion with a solid content of 55%.
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