A method for film-coating aluminum powder pigments with an anchoring agent
An anchoring agent and film coating technology, applied in the direction of inorganic pigment treatment, chemical instruments and methods, fibrous fillers, etc., can solve the problems of product quality and safe production, and achieve excellent storage stability, good metallic luster, Coated film and uniform effect
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Embodiment 1
[0032] Embodiment 1 (comparison formula)
[0033] 100g aluminum silver paste (containing 74%wt% aluminum powder, surface area 343m 2 ) and 200g of isopropanol were evenly mixed into the reactor, and stirred at 40°C for 1h. Add dropwise at a constant rate within 4 hours: ① a mixed solution of 30ml (0.1346mol) ethyl orthosilicate, 20ml (0.08547mol) silane coupling agent KH550 and 50ml isopropanol, ② 16ml water, 7.1ml concentrated ammonia water and 50ml isopropanol mixed solution of propanol. Then react at a constant temperature of 40°C for 6h. Finally, it was naturally cooled to room temperature, aged for 12 hours, and suction-filtered to obtain an inorganic / organosilicon-coated aluminum powder pigment. Particle size distribution: 10μm~35μm.
Embodiment 2
[0035] Aluminum silver paste 100g (surface area 343m 2 ), and 200ml of isopropanol were evenly mixed into the reactor, and stirred at 40°C for 1h. Add 60ml of ammonia-ammonium sulfate buffer solution with pH=8.8 at a constant rate within 25 minutes to dissolve 1g (0.004mol) CuSO4 ·5H 2 O the resulting solution; then add dropwise a mixed solution of 30ml (0.1346mol) ethyl orthosilicate, 20ml (0.08547mol) silane coupling agent KH550 and 50ml of isopropanol at a constant rate within 3h, react at a constant temperature of 40°C for 6h, and then suction filter , to get aluminum powder pigment. Particle size distribution: 12μm~30μm.
Embodiment 3
[0037] Aluminum silver paste 100g (surface area 343m 2 ) and 200ml of isopropanol were evenly mixed into the reactor, and stirred at 40°C for 2h. Add 60ml of ammonia-ammonium chloride buffer solution with pH=9.2 at a constant rate within 25 minutes to dissolve 0.6g (0.0024mol) CuSO 4 ·5H 2 O the resulting solution; then add dropwise a mixed solution of 30ml (0.1346mol) ethyl orthosilicate, 20ml (0.08547mol) KH550 and 50ml isopropanol at a constant rate within 3h, and suction filter after constant temperature reaction at 40°C for 6h to obtain aluminum powder pigment. Particle size distribution: 11 μm ~ 28 μm.
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