Pearlescent pigment, preparation method and coloring pearlescent pigment for cosmetics prepared from same
A pearlescent pigment and cosmetic technology, applied in the field of cosmetic pigments, can solve the problems of organic matrix organic pigment fading, product color migration, poor tolerance, etc., and achieve the effects of alleviating color change and color migration, convenient processing and operation, and strong economy.
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[0046] According to one aspect of the present invention, a kind of preparation method of above-mentioned pearlescent pigment, described method comprises the following steps:
[0047] First, the synthetic mica is added with water to make a slurry, then the tin oxide layer and the silicon-doped titanium dioxide layer are sequentially coated on the synthetic mica by the method of hydrolysis coating, and then the calcium borate layer is coated by the co-precipitation method of the metal compound. A pearlescent pigment is obtained.
[0048] The preparation method of the pearlescent pigment provided by the present invention comprises the following steps: firstly, adding water to the synthetic mica to make a slurry, then coating the tin oxide layer and the silicon-doped titanium dioxide layer on the synthetic mica in sequence by using a hydrolytic coating method, and then The calcium borate layer is coated by the co-precipitation method of the metal compound to obtain the pearlescent...
Embodiment 1
[0069] A kind of pearlescent pigment, the preparation method of described pearlescent pigment is as follows:
[0070] (1) Under stirring conditions, add 100g of fluorophlogopite mica with a particle size ranging from 5 to 45μm (average particle size is 27μm) into 2L of soft water, and heat to 60°C to adjust the pH value of the solution to 1.5. Add 100mL 2.5% tin tetrachloride aqueous solution, maintain the pH value of the solution with 30% NaOH solution, and hydrolyze the coated tin oxide layer;
[0071] (2) Warm up the solution coated with the tin oxide layer to between 75°C, adjust the pH value of the solution between 1.8, add 450ml of 2mol / L titanium tetrachloride solution dropwise at a rate of 1mL / min, and % NaOH solution (wherein the content of sodium silicate is 1.5%) maintains the pH value of the solution constant, and hydrolyzes and coats the silicon-doped titanium dioxide layer;
[0072] (3) Adjust the pH of the solution coated with the silicon-doped titanium dioxide...
Embodiment 2
[0076] A kind of pearlescent pigment, the preparation method of described pearlescent pigment is as follows:
[0077] (1) Under stirring conditions, add 100g of fluorophlogopite mica with a particle size ranging from 5 to 45μm (average particle size is 27μm) into 2L of soft water, and heat to 60°C to adjust the pH value of the solution to 1.8. Add 100mL 2.5% tin tetrachloride aqueous solution, maintain the pH value of the solution with 30% NaOH solution, and hydrolyze the coated tin oxide layer;
[0078] (2) Warm up the solution coated with the tin oxide layer to between 85°C, adjust the pH value of the solution between 2.0, add 450ml of 2mol / L titanium tetrachloride solution dropwise at a rate of 1mL / min, and % NaOH solution (wherein the content of sodium silicate is 1.5%) maintains the pH value of the solution constant, and hydrolyzes and coats the silicon-doped titanium dioxide layer;
[0079] (3) Adjust the pH of the solution coated with the silicon-doped titanium dioxide...
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