Preparation method of high-reflectivity flaky pearlescent pigment bismuth oxychloride

Abstract

The invention relates to a preparation method of bismuth oxychloride, particularly a preparation method of high-reflectivity flaky pearlescent pigment bismuth oxychloride. The invention aims to solve the problem of high technical cost required by high-brightness high-dispersity uniform-size clear-edge high-refractivity flaky bismuth oxychloride crystals incapable of aggregation when being placed in a liquid medium for a long time. The method comprises the following steps: 1. preparing a bismuth nitrate solution; 2. preparing a sodium lauryl sulfate solution; 3. preparing a suspension solution; 4. preparing a mixed solution; 5. preparing a magnesium chloride brine, pouring into the mixed solution, keeping the temperature at 0-70 DEG C, filtering, and taking the solid-phase substance; and 6. cleaning the solid-phase substance with deionized water, and drying to to obtain the high-reflectivity flaky pearlescent pigment bismuth oxychloride, thereby finishing the preparation method of the high-reflectivity flaky pearlescent pigment bismuth oxychloride. The invention is applied to the field of chemical engineering.

Description

technical field

[0001] The invention relates to a preparation method of bismuth oxychloride. Background technique

[0002] High-reflectivity flaky bismuth oxychloride is an important inorganic pigment used in high-grade cosmetics, coatings, plastic additives, artificial pearls, whitening for pearlescent glazes, glaze seasonings, and paint toning. High brightness, high dispersion, uniform size, clear edges, no agglomeration and agglomeration after long-term placement in liquid media, high refractive index flake bismuth oxychloride crystals are basically synthesized by hydrothermal or solvothermal methods, both of which require High temperature and high pressure, and complex operation, need to prepare precursors, long production cycle, the whole process takes more than ten hours, and the organic solvent used in solvothermal will pollute the environment. Contents of the invention

[0003] The present invention aims to solve the problems of complex operation and long producti...

Examples

specific Embodiment approach 1

[0008] Specific embodiment one: the preparation method of high-reflectance flaky pearlescent pigment bismuth oxychloride of this embodiment, carry out according to the following steps: one, bismuth nitrate is dissolved in the nitric acid solution that mass percentage content is 50~65%, then Dilute with water until the concentration of bismuth nitrate solution is 0.005-200g / L to obtain bismuth nitrate solution; 2. Dissolve sodium lauryl sulfate in water at 0-100°C to obtain dodecyl sulfate with a concentration of 0.0001-20g / L Sodium sulfate solution; 3. Add sodium lauryl sulfate solution to the bismuth nitrate solution in step 1 at 0-70°C, add water to dilute until no precipitation occurs, and obtain a suspension solution; Add the nitric acid that the mass percent content is 65% to the precipitate completely disappears in the suspended solution; Five, the preparation concentration is the magnesium chloride aqueous solution of 0.1~100g / L, then pours in the solution after the nitr...

specific Embodiment approach 2

[0010] Embodiment 2: This embodiment differs from Embodiment 1 in that the concentration of the nitric acid solution in Step 1 is 50-65%. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, sodium lauryl sulfate is dissolved in water at 60-80°C to obtain dodecyl sulfate with a concentration of 0.002-2g / L sodium sulfate solution. Other steps and parameters are the same as those in Embodiment 1 or 2.

technical field

[0001] The invention relates to a preparation method of bismuth oxychloride. Background technique

[0002] High-reflectivity flaky bismuth oxychloride is an important inorganic pigment used in high-grade cosmetics, coatings, plastic additives, artificial pearls, whitening for pearlescent glazes, glaze seasonings, and paint toning. High brightness, high dispersion, uniform size, clear edges, no agglomeration and agglomeration after long-term placement in liquid media, high refractive index flake bismuth oxychloride crystals are basically synthesized by hydrothermal or solvothermal methods, both of which require High temperature and high pressure, and complex operation, need to prepare precursors, long production cycle, the whole process takes more than ten hours, and the organic solvent used in solvothermal will pollute the environment. Contents of the invention

[0003] The present invention aims to solve the problems of complex operation and long producti...

Examples

specific Embodiment approach 1

[0008] Specific embodiment one: the preparation method of high-reflectance flaky pearlescent pigment bismuth oxychloride of this embodiment, carry out according to the following steps: one, bismuth nitrate is dissolved in the nitric acid solution that mass percentage content is 50~65%, then Dilute with water until the concentration of bismuth nitrate solution is 0.005-200g / L to obtain bismuth nitrate solution; 2. Dissolve sodium lauryl sulfate in water at 0-100°C to obtain dodecyl sulfate with a concentration of 0.0001-20g / L Sodium sulfate solution; 3. Add sodium lauryl sulfate solution to the bismuth nitrate solution in step 1 at 0-70°C, add water to dilute until no precipitation occurs, and obtain a suspension solution; Add the nitric acid that the mass percent content is 65% to the precipitate completely disappears in the suspended solution; Five, the preparation concentration is the magnesium chloride aqueous solution of 0.1~100g / L, then pours in the solution after the nitr...

specific Embodiment approach 2

[0010] Embodiment 2: This embodiment differs from Embodiment 1 in that the concentration of the nitric acid solution in Step 1 is 50-65%. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, sodium lauryl sulfate is dissolved in water at 60-80°C to obtain dodecyl sulfate with a concentration of 0.002-2g / L sodium sulfate solution. Other steps and parameters are the same as those in Embodiment 1 or 2.

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