Black pearlescent pigment and its preparation method and application
A pearlescent pigment and black technology, which is applied in pigment preparation, inorganic pigment treatment, chemical instruments and methods, etc., can solve the problems of insufficient blackness and brightness, limit the application range of black pearlescent pigments, poor temperature resistance, etc., and achieve high blackness and brightness, increased reflection and refraction, and convenient processing and operation
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[0057] According to one aspect of the present invention, a kind of preparation method of black pearlescent pigment, described method comprises the following steps:
[0058] First, add water to the pigment base material to make a slurry, and then use the method of hydrolytic coating in sequence according to the layered sequence of the black pearlescent pigment from the inside to the outside. 1, a silicon-doped cobalt oxide layer, a second ferric oxide layer and a second cobalt oxide layer are coated on the pigment substrate, and then an outer protective layer is optionally coated to obtain a black pearlescent pigment.
[0059] The preparation method of the black pearlescent pigment provided by the present invention, the preparation method uses the method of hydrolytic coating in sequence according to the layered sequence of the black pearlescent pigment from the inside to the outside, the indium oxide layer, the first ferric oxide layer, the first oxide The cobalt layer, the si...
Embodiment 1
[0078] Under stirring conditions, add 100 g of fluorphlogopite mica with a particle size range of 5-45 μm (average particle size is 27 μm) into 2 L of soft water, and heat to 80 ° C, and adjust the pH value to 3.0 with 1:1 hydrochloric acid, Then slowly meter in 200ml 5% indium trichloride solution, adopt 30% sodium hydroxide solution to carry out constant pH value constant,
[0079] After the addition, continue to slowly meter in 900ml of 10% ferric chloride solution. During this period, use 30% sodium hydroxide solution to keep the pH constant, and then increase the pH to 8.0, then slowly meter in 200ml of 5% Cobalt chloride solution, simultaneously with 30% sodium hydroxide control and keep PH=8.0 constant;
[0080] Continue to stir for half an hour after the addition, use 1:1 hydrochloric acid to reduce the pH value to 3.0, continue to slowly add 900ml of 10% ferric chloride solution, and use 30% sodium hydroxide solution to keep the pH value unchanged.
[0081] Continue ...
Embodiment 2
[0085] Under stirring conditions, add 100 g of fluorphlogopite mica with a particle size range of 5-45 μm (average particle size is 27 μm) into 2 L of soft water, and heat to 80 ° C, and adjust the pH value to 3.0 with 1:1 hydrochloric acid, Then slowly meter in 200ml 5% indium trichloride solution, adopt 30% sodium hydroxide solution to carry out constant pH value constant,
[0086] After the addition, continue to slowly meter in 900ml of 10% ferric chloride solution. During this period, use 30% sodium hydroxide solution to keep the pH constant, and then increase the pH to 8.0, then slowly meter in 200ml of 5% Cobalt chloride solution, while using 30% sodium hydroxide to control and keep pH=8.0 constant.
[0087] Continue stirring for half an hour after the addition, at this pH value, slowly meter in 500 ml of 20% sodium silicate solution while controlling and keeping the pH at 8.0 with 5% cobalt chloride solution.
[0088] Continue to stir for half an hour after the additio...
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Abstract
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