Preparation method for nano white carbon black modified polyether type aqueous polyurethane for coating
A technology of nano-silica and water-based polyurethane, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy yellowing and poor storage stability of water-based polyurethane, so as to improve the bonding fastness and prevent yellowing , Improve the effect of storage stability
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Embodiment 1
[0032] (1) Preparation of phosphated polyethylene glycol:
[0033] Accurately weigh 8.886g of polyethylene glycol (PEG) into a dry 250ml Erlenmeyer flask, add 20ml of N, N-dimethylformamide (DMF) to dissolve, and then add 1.082g of polyphosphoric acid (PPA ), and then placed on a magnetic stirrer at 85°C for 3 hours to fully react to obtain phosphated polyethylene glycol.
[0034] (2) Preparation of modified nano-silica:
[0035] Be that the white carbon black aqueous solution of 5% is joined in the 250ml four-necked flask that electric stirrer, thermometer, reflux condenser, nitrogen tube are housed by mass fraction, then add the phosphorylated polyethylene glycol of 0.095g, the four-necked flask The surface modification reaction was carried out under high-speed stirring in an oil bath at 80°C. After reacting for 4 hours, unreacted phosphorylated polyethylene glycol was removed by filtration, and then rinsed with distilled water for 2-3 times until it was washed clean, and ...
Embodiment 2
[0041] (1) Preparation of phosphated polyethylene glycol:
[0042] Accurately weigh 5.012g of polyethylene glycol in a dry 250ml Erlenmeyer flask, add 20ml of N,N-dimethylformamide to dissolve, add 0.564g of polyphosphoric acid after dissolution, and place on a magnetic stirrer Fully react at 80°C for 3 hours to obtain phosphated polyethylene glycol.
[0043] (2) Preparation of modified nano-silica:
[0044]Be that the white carbon black aqueous solution of 5% is joined in the 250ml four-necked flask that electric stirrer, thermometer, reflux condenser, nitrogen tube are housed by mass fraction, then add the phosphorylated polyethylene glycol of 0.097g, the four-necked flask The surface modification reaction was carried out under high-speed stirring in an oil bath at 80°C. After reacting for 4 hours, unreacted phosphorylated polyethylene glycol was removed by filtration, and then rinsed with distilled water for 2-3 times until it was washed clean, and then vacuum-dried at 70...
Embodiment 3
[0048] (1) Preparation of phosphated polyethylene glycol:
[0049] Accurately weigh 8.886g of polyethylene glycol (PEG) into a dry 250ml Erlenmeyer flask, add 20ml of DMF to dissolve, add 1.082g of polyphosphoric acid (PPA) after dissolution, and then place it on a magnetic stirrer at 90 It was fully reacted at ℃ for 3h to obtain phosphorylated polyethylene glycol.
[0050] (2) Preparation of modified nano-silica:
[0051] Be that the white carbon black aqueous solution of 5% is joined in the 250ml four-necked flask that electric stirrer, thermometer, reflux condenser, nitrogen tube are housed by mass fraction, then add the phosphorylated polyethylene glycol of 0.095g, the four-necked flask The surface modification reaction was carried out under high-speed stirring in an oil bath at 80°C. After reacting for 4 hours, unreacted phosphorylated polyethylene glycol was removed by filtration, and then rinsed with distilled water for 2-3 times until it was washed clean, and then va...
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