A hyperbranched anti-sagging agent and its application in one-component polyurethane waterproof coating
A polyurethane waterproof and anti-sagging technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of large amount of anti-sag additives, dust pollution, complex production process, etc., to improve acid and alkali corrosion resistance. performance, improve efficiency and reduce costs
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Embodiment approach 1
[0037] (1) Accurately weigh phthalic anhydride with an electronic balance, dissolve it in N,N-dimethylacetamide (DMAc), place it in a beaker, and dissolve it fully. Add diisoalcoholamine into the three-necked flask, and stir well. Drop fully dissolved phthalic anhydride into a three-necked flask, and react at room temperature for 3 h to obtain AB 2 monomer.
[0038] (2) Add toluene to the above system first, weigh trimethylolpropane, dissolve it fully with a small amount of DMAc, then add it to a three-necked flask, then add p-toluenesulfonic acid, heat to 130°C to condense and reflux, and condense spherically There is reflux in the tube, and the heat preservation reaction is 7-8h.
[0039] (3) Add TDI to the hyperbranched polymer obtained above, and add p-toluenesulfonic acid as a catalyst, stir evenly, react continuously at constant temperature for 6 hours, and distill under reduced pressure. A hyperbranched polymer terminated in isocyanate is obtained.
[0040] (4) Add ...
Embodiment approach 2
[0043] (1) Accurately weigh phthalic anhydride with an electronic balance, dissolve it in N,N-dimethylacetamide (DMAc), place it in a beaker, and dissolve it fully. Add diisoalcoholamine into the three-necked flask, and stir well. Drop fully dissolved phthalic anhydride into a three-necked flask, and react at room temperature for 3 h to obtain AB 2 monomer.
[0044](2) Add toluene to the above system first, weigh trimethylolpropane, dissolve it fully with a small amount of DMAc, then add it to a three-necked flask, then add p-toluenesulfonic acid, heat to 130°C to condense and reflux, and condense spherically There is reflux in the tube, and the insulation reaction is 7-8h.
[0045] (3) Add TDI to the hyperbranched polymer obtained above, and add p-toluenesulfonic acid as a catalyst, stir evenly, react continuously at constant temperature for 6 hours, and distill under reduced pressure. A hyperbranched polymer terminated in isocyanate is obtained.
[0046] (4) Add tetramet...
Embodiment approach 3
[0049] (1) Accurately weigh phthalic anhydride with an electronic balance, dissolve it in N,N-dimethylacetamide (DMAc), place it in a beaker, and dissolve it fully. Add diisoalcoholamine into the three-necked flask, and stir well. Drop fully dissolved phthalic anhydride into a three-necked flask, and react at room temperature for 3 h to obtain AB 2 monomer.
[0050] (2) Add toluene to the above system first, weigh trimethylolpropane, dissolve it fully with a small amount of DMAc, then add it to a three-necked flask, then add p-toluenesulfonic acid, heat to 130°C to condense and reflux, and condense spherically There is reflux in the tube, and the insulation reaction is 7-8h.
[0051] (3) Add TDI to the hyperbranched polymer obtained above, and add p-toluenesulfonic acid as a catalyst, stir evenly, react continuously at constant temperature for 6 hours, and distill under reduced pressure. A hyperbranched polymer terminated in isocyanate is obtained.
[0052] (4) Add tetrame...
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