Nano-modification chromium-free zinc-aluminium coating and preparation method thereof
A zinc-aluminum coating and nano-modification technology, applied in anti-corrosion coatings, coatings, etc., can solve problems such as the gap in coating hardness, and achieve the effect of enhancing compactness and improving hydrophobicity
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Embodiment 1
[0014] 1. After mixing 4,4'-diaminodiphenyl ether and pyromellitic anhydride in a ratio of 1:1.08, stir at room temperature with a rotation speed of 140 rpm, and then add dimethyl form into the solution Amide, the mass ratio of the solution to dimethylformamide is 1:8, the constant temperature stirring is continued for 11 hours, and after standing for 24 hours, the polyimide resin is obtained.
[0015] 2. Back up according to the following mass percentages: zinc aluminum powder: 58wt%, polyimide resin: 30wt%, titanate coupling agent: 1wt%, Tween-20: 9wt%, nano-SiO 2 : 0.6wt%, nano Al 2 o 3 : 0.8wt%, defoamer: 0.6wt%. Nano-SiO 2 and nano Al 2 o 3 The particle size is 10~15nm, the sheet diameter is 0.1~0.2nm,
[0016] 3. Add titanate coupling agent and Tween-20 to the polyimide solution in turn, stir at room temperature until the solution is light yellow and viscous, then add zinc-aluminum powder and defoamer, and continue stirring for 30 minutes.
[0017] 4. Incorporatin...
Embodiment 2
[0020] 1. After mixing 4,4'-diaminodiphenyl ether and pyromellitic anhydride in a ratio of 1:1.08, stir at room temperature with a rotation speed of 140 rpm, and then add dimethyl form into the solution Amide, the mass ratio of the solution to dimethylformamide is 1:8, the constant temperature stirring is continued for 11 hours, and after standing for 24 hours, the polyimide resin is obtained.
[0021] 2. Back up according to the following mass percentages: zinc aluminum powder: 46wt%, polyimide resin: 43wt%, titanate coupling agent: 2wt%, Tween-20: 6wt%, nano-SiO 2 : 1wt%, nano Al 2 o 3 : 1wt%, defoamer: 1wt%. Nano-SiO 2 and nano Al 2 o 3 The particle size is 10~15nm, the sheet diameter is 0.1~0.2nm,
[0022] 3. Add titanate coupling agent and Tween-20 to the polyimide solution in turn, stir at room temperature until the solution is light yellow and viscous, then add zinc-aluminum powder and defoamer, and continue stirring for 30 minutes.
[0023] 4. Incorporating nano...
Embodiment 3
[0026] 1. After mixing 4,4'-diaminodiphenyl ether and pyromellitic anhydride in a ratio of 1:1.08, stir at room temperature with a rotation speed of 140 rpm, and then add dimethyl form into the solution Amide, the mass ratio of the solution to dimethylformamide is 1:8, the constant temperature stirring is continued for 11 hours, and after standing for 24 hours, the polyimide resin is obtained.
[0027] 2. Back up according to the following mass percentages: zinc aluminum powder: 50wt%, polyimide resin: 39wt%, titanate coupling agent: 1.5wt%, Tween-20: 7wt%, nano-SiO 2 : 0.9wt%, nano Al 2 o3 : 0.9wt%,, defoamer: 0.7wt%. Nano-SiO 2 and nano Al 2 o 3 The particle size is 10~15nm, the sheet diameter is 0.1~0.2nm,
[0028] 3. Add titanate coupling agent and Tween-20 to the polyimide solution in turn, stir at room temperature until the solution is light yellow and viscous, then add zinc-aluminum powder and defoamer, and continue stirring for 30 minutes.
[0029] 4. Incorporati...
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