Bi-component modified waterborne polyurethane flame-retardant coating adhesive and preparation method thereof
A water-based polyurethane, two-component modification technology, applied in polyurea/polyurethane coatings, coatings, fireproof coatings, etc., can solve water resistance, alkali resistance, poor temperature resistance, difficulty in applying high-end materials, foaming and to improve flame retardancy and mechanical properties, promote and apply environmental protection and energy saving, and improve stability
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Embodiment 1
[0044] Take 10g of montmorillonite and 120mL of an aqueous solution with a mass fraction of 50% ethanol and mix them. After ultrasonic dispersion at room temperature for 0.5h, heat to 75°C and add 4g of dodecylbishydroxyethylmethylammonium chloride to the reaction system. , after reacting for 6 hours, cooling, centrifugal precipitation, repeated washing with absolute ethanol, and vacuum drying to obtain modified montmorillonite.
[0045] React 50g of HDI and 371g of polybutadiene diol with a molecular weight of 3000 at 75°C for 2.5h, then lower the temperature to 55°C, dissolve 3.2g of 1,4-butanediol with 50g of acetone and add dropwise for 20min, then continue After reacting for 1.5 h, then raising the temperature to 70° C., adding a mixed solution of 6 g of modified montmorillonite and 60 mL of N-methylpyrrolidone to react for 1.5 h to obtain a polyurethane prepolymer.
[0046] Add 550g of acetone to the modified polyurethane prepolymer to reduce the viscosity of the emulsio...
Embodiment 2
[0052] Mix 10g of montmorillonite with 120mL of 50% ethanol aqueous solution, ultrasonically disperse at room temperature for 1h, heat to 70°C, add 3g of hexadecyl dihydroxyethylammonium bromide to the reaction system, and react for 8h Finally, cooling, centrifugal precipitation, repeated washing with absolute ethanol, and vacuum drying to obtain modified montmorillonite;
[0053] React 50g of IPDI and 225g of polycaprolactone diol with a molecular weight of 2000 at 80°C for 3h, then lower the temperature to 50°C, dissolve 4g of 2,3-butanediol in 60g of acetone and add dropwise for 30min, then continue the reaction for 2h, then After raising the temperature to 75°C, add a mixed solution of 9 g of modified montmorillonite and 80 mL of N-methylpyrrolidone to react for 1.5 h to obtain a polyurethane prepolymer;
[0054] Add 350g of acetone to the modified polyurethane prepolymer to reduce the viscosity of the emulsion into drops, then add 16.2g of 50% 1,4-butanediol-2-sodium sulf...
Embodiment 3
[0060] Take 20g of montmorillonite and 120mL of 50% ethanol aqueous solution and mix them, after ultrasonic dispersion at room temperature for 0.5h, heat to 80°C, add 5g of dodecyl ammonium chloride dihydroxypropyl dimethyl to the reaction system base, after reacting for 7 hours, cooling, centrifugal precipitation, repeated washing with absolute ethanol, and vacuum drying to obtain modified montmorillonite;
[0061] React 50g of 1,4-cyclohexane diisocyanate and 540g of polyadipate-1,4-butylene adipate diol with a molecular weight of 3000 at 75°C for 2 hours, then lower the temperature to 60°C, and 4.1g of 1,3 -Propylene glycol was dissolved in 60g of acetone and added dropwise for 15min, and then continued to react for 1.5h, then added a mixed solution of 12g of modified montmorillonite and 100mL of N-methylpyrrolidone to react for 2h after raising the temperature to 65°C to obtain a modified polyurethane prepolymer body;
[0062] Add 800g of acetone to the modified polyureth...
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