A kind of preparation method of coated modified aluminum powder pigment
A technology of modification of aluminum pigments, applied in the field of pigments, to achieve the effects of thin shell, narrow particle size distribution and improved application performance
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[0022] The invention discloses a method for preparing a coated modified aluminum pigment, comprising the following steps:
[0023] (1) Raw material preparation: add aluminum pigment into absolute ethanol solution, stir to form a suspension with a solid-to-liquid ratio of 1 / 20-25, and set aside; mix styrene, butyl acrylate, methacrylic acid and 2,2′- Dissolve azobisisobutyronitrile in deionized water at a mass ratio of 2:1:0.5:0.005, stir to form a mixed monomer solution with a mass concentration of 0.3-0.5g / L, and set aside;
[0024] (2) One-stage polymerization reaction: Add the mixed monomer solution prepared in step (1) into the suspension under stirring, heat up to 40-50°C while stirring, and then add a certain amount of 2-3 : The mixture of magnesium hydroxide and tricalcium phosphate mixed with a mass ratio of 1 is used as a dispersant. After stirring at a high speed of 10000-12000r / min at a constant temperature for 30-40min, ultrasonically disperse for 1-2h to form a un...
Embodiment 1
[0028] Add 5g of aluminum pigment into 100ml of absolute ethanol solution, stir to form a suspension, and set aside; take 20g of styrene, 10g of butyl acrylate, 5g of methacrylic acid and 0.05g of 2,2'-azobisisobutyronitrile and dissolve in 120ml of deionized water , stirred to form a mixed monomer solution, set aside;
[0029] Add the above mixed monomer solution into the suspension under stirring, heat up to 40°C while stirring, and then add 5.6g of a mixture of magnesium hydroxide and tricalcium phosphate mixed at a mass ratio of 2:1. After stirring at a high speed of 10000r / min for 40min, ultrasonically disperse for 1h to form a pre-polymer with uniform texture; then place the pre-polymer in a nitrogen-protected polymerization reactor at a stirring rate of 290r / min at 95°C The polymerized product is obtained by aging for 3 hours under constant temperature conditions; the polymerized product is filtered, vacuumed, washed with absolute ethanol for 5 to 8 times, and dried at ...
Embodiment 2
[0031] Add 5g of aluminum pigment into 125ml of absolute ethanol solution, stir to form a suspension, and set aside; take 20g of styrene, 10g of butyl acrylate, 5g of methacrylic acid and 0.05g of 2,2'-azobisisobutyronitrile and dissolve in 100ml of deionized water , stirred to form a mixed monomer solution, set aside;
[0032] Add the above-mentioned mixed monomer solution into the suspension under stirring, heat up to 50°C while stirring, then add 7g of a mixture of magnesium hydroxide and tricalcium phosphate mixed in a mass ratio of 3:1 and set the temperature at 12000rr After stirring at a high speed of 30 min at a rate of 30 min, ultrasonically disperse for 2 h to form a pre-polymer with uniform texture; Aging at a constant temperature for 2 hours to obtain a polymer product; the polymer product is filtered, vacuumed, washed with absolute ethanol for 5 to 8 times, and dried at room temperature to obtain the coated modified aluminum pigment.
[0033] The thickness of the...
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