Preparation method of low-molecular-weight cationic polyacrylamide hydrophilic coating
A polyacrylamide, cationic technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy corrosion, strong acid and alkali corrosion resistance, insufficient hydrophilicity, etc.
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Embodiment 1
[0013] Manganese sulfate, sodium bisulfite, and azobisisobutylamidine hydrochloride aqueous solutions were prepared first, with concentrations of 20%, 10%, and 20% respectively. Add 500 kg of acrylamide, 50 kg of dimethyl diallyl ammonium chloride, 50 kg of hydroxyethyl methacrylate, 0.5 kg of metal ion chelating agent, and 1400 kg of deionized water into the reactor. Start stirring, nitrogen deoxygenation. After all the raw materials are dissolved, continue to fill with nitrogen for 30 minutes, then add 400 ml of manganese sulfate solution and 400 ml of azobisisobutylamidine hydrochloride solution, and continue to fill with nitrogen for 30 minutes. Then, feed into polyethylene plastic bags from the discharge opening of the reactor, and the capacity of the plastic bags is 20kg. Inject 200ml of sodium sulfite solution into each bag and seal the bag immediately. And put the plastic bag into water at a constant temperature of 10°C. After 2 hours, the plastic bag was tra...
Embodiment 2
[0015] Manganese sulfate, sodium bisulfite, and azobisisobutylimidazoline hydrochloride aqueous solutions were prepared first, with concentrations of 20%, 10%, and 20% respectively. Add 450 kg of acrylamide, 75 kg of dimethyl diallyl ammonium chloride, 75 kg of hydroxyethyl methacrylate, 0.3 kg of metal ion chelating agent, and 1400 kg of deionized water into the reactor. Start stirring, nitrogen deoxygenation. After all the raw materials are dissolved, continue to fill with nitrogen for 30 minutes, then add 200 ml of manganese sulfate solution and 500 ml of azobisisobutylamidine hydrochloride solution, and continue to fill with nitrogen for 30 minutes. Then, feed into polyethylene plastic bags from the discharge opening of the reactor, and the capacity of the plastic bags is 20kg. Inject 400ml of sodium sulfite solution into each bag and seal the bag immediately. And put the plastic bag into water at a constant temperature of 10°C. After 4 hours, the plastic bag was...
Embodiment 3
[0017] Take out 40kg low molecular weight cationic polyacrylamide aqueous solution from the plastic bag of embodiment 1, add in the mixing jar. Add 171kg of water-based polyurethane resin (35% solid content), 66kg of water-based polyisocyanate curing agent (38% solid content) and a small amount of defoamer to the tank. Adjust the viscosity with deionized water, apply 4 cups and measure the viscosity to be 18-24s. A hydrophilic coating is obtained. Spray the hydrophilic paint onto the epoxy resin coating as the substrate, dry it at 120°C for 30min, and measure the water contact angle as 8o.
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