Waterborne polyurethane toughened waterborne epoxy resin anticorrosive coating and preparation method thereof
A water-based epoxy resin and water-based polyurethane technology, used in epoxy resin coatings, polyurea/polyurethane coatings, anti-corrosion coatings, etc. Material brittleness and other problems, to achieve the effect of preventing fine cracks in the coating, high elongation at break, and increased tensile strength
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Embodiment 1
[0024] 1) Preparation of nonionic-anionic waterborne polyurethane:
[0025] Add 0.09mol of polytetramethylene ether glycol (oligomer polyol) with a molecular weight of 2000, 0.01mol of polyester diol with a molecular weight of 2000, and 0.3mol of isophorone diisocyanate in the reactor at 50°C (Polyisocyanate), 0.065mol dimethylol propionic acid, 0.035mol 1,4 butanediol, 0.03mol polyethylene glycol monomethyl ether (hydrophilic monomer containing ethoxy group) with a molecular weight of 500 react completely to generate For the isocyanate-terminated prepolymer, add 20% of the mass of the prepolymer in acetone to dilute and add 0.06mol of triethylamine (TEA) to 600g of water and stir vigorously for 5 minutes, then add dropwise 0.085mol of diethylenetriamine (amine chain extender) Chain extension, and vacuum removal of acetone to obtain an amine-based aqueous polyurethane emulsion with a particle size of 50 nm.
[0026] 2) Preparation of waterborne polyurethane toughened epoxy re...
Embodiment 2
[0031] 1) Preparation of anionic waterborne polyurethane:
[0032] Add 0.1 mol of polytetramethylene ether glycol (oligomer polyol) with a molecular weight of 2000 (oligomer polyol), 0.3 mol of isophorone diisocyanate (polyisocyanate) and 0.11 mol of dimethylol in the reaction kettle at 50°C. Propionic acid (DMPA) was fully reacted at 80°C, adding 20% of the weight of the prepolymer in acetone to dilute, and adding 0.11mol of triethylamine (TEA) for neutralization, adding 560g of water and stirring vigorously for 5 minutes to disperse into an emulsion, and after emulsification, add 0.06 mol of isophorone diamine (amine chain extender) increases the molecular weight of polyurethane, and at the same time introduces a certain amount of amine groups on the polyurethane, and removes all the acetone by vacuuming to obtain water-based polyurethane, which realizes the preparation of polyurethane emulsion particles The diameter is 90nm.
[0033] 2) The preparation method of waterbor...
Embodiment 3
[0036] 1) Preparation of anionic waterborne polyurethane:
[0037]At 50 DEG C, add 0.05mol molecular weight 2000 polybutylene adipate diol, 0.05mol molecular weight 2000 polypropylene glycol, 0.1mol xylene diisocyanate, 0.2mol isophorone diisocyanate (polyethylene glycol) in the reaction kettle isocyanate), after stirring at a constant speed for 30 minutes, heat up to 80°C for 1 hour, cool down to 60°C and add 0.1mol dimethylol butyric acid (DMBA) to fully react until -NCO reaches the theoretical value, cool down to room temperature, and add 20% polyurethane mass Dilute with acetone (solvent), add 0.1mol triethylamine to neutralize, add 600g water to emulsify for 5 minutes, add dropwise 0.08mol isophordione diamine to continue the reaction for 1 hour, then vacuumize to remove the solvent acetone to obtain a polyurethane emulsion with a particle size of 80nm .
[0038] 2) The preparation method of waterborne polyurethane toughened epoxy resin emulsion is the same as 1.
[003...
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