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A doped composite oxide-coated mica pearlescent composite pigment and its preparation

A technology of composite oxides and composite pigments, applied in the direction of inorganic pigment treatment, fibrous fillers, chemical instruments and methods, etc., can solve problems such as complex processes and multi-layer coatings, and achieve simple processes, improved performance, and excellent performance Effect

Inactive Publication Date: 2015-12-09
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a doped composite oxide-coated mica pearlescent composite pigment and its preparation, which combines the performance advantages of doped cobalt chrome green and pearlescent mica pigments, and solves the problem of traditional pearlescent mica pigments requiring multi-layer coating and technical problems. Complex issues while improving the temperature resistance, weather resistance and corrosion resistance of composite pigments

Method used

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  • A doped composite oxide-coated mica pearlescent composite pigment and its preparation
  • A doped composite oxide-coated mica pearlescent composite pigment and its preparation
  • A doped composite oxide-coated mica pearlescent composite pigment and its preparation

Examples

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Effect test

Embodiment 1

[0027] (1) Mica pretreatment: 70-80°C water bath temperature, 5% hydrochloric acid to mica liquid-solid mass ratio of 20, stir for 30 minutes, wash and dry. Take 30g of pretreated mica (with a particle size of 5-25μm) to prepare 10wt% mica slurry.

[0028] (2) Composite pigment Co .0.9 Zn 0.1 Cr 2 o 4 / Mica precursor preparation, preparation of cobalt chromium zinc ion solution: 5.24gCo(NO 3 ) 2 .6H 2 O, 0.59gZn(NO 3 ) 2 .6H 2 O and 16gCr(NO 3 ) 3 .9H 2 O was added to 100ml of deionized water to form a mixed solution; 8g of sodium hydroxide was dissolved in water to form a solution equal in volume to the cobalt-chromium-zinc ion solution. Heat the mica slurry in a water bath to 70°C, under the condition of mechanical stirring at 300rmp, slowly add the cobalt-chromium-zinc solution and the sodium hydroxide solution dropwise at the same time, the dropping time is 1.5h, the dropping is completed, adjust the pH to 8.5-9.5, and mature for half an hour. After washing w...

Embodiment 2

[0031] (1) Mica pretreatment: 70-80°C water bath temperature, 5% hydrochloric acid to mica liquid-solid mass ratio of 20, stir for 30 minutes, wash and dry. Take 30g of pretreated mica (with a particle size of 5-25μm) to prepare 10wt% mica slurry.

[0032] (2) Composite pigment Co 0.7 Zn 0.3 Cr 2 o 4 / Mica precursor preparation, preparation of cobalt chromium zinc ion solution: 4.07gCo(NO 3 ) 2 .6H 2 O, 1.78gZn(NO 3 ) 2 .6H 2 O and 16gCr(NO 3 ) 3 .9H 2 O was added to 100ml of deionized water to form a mixed solution; 8g of sodium hydroxide was dissolved in water to form a solution equal in volume to the cobalt-chromium-zinc ion solution. Heat the mica slurry in a water bath to 70°C, under the condition of mechanical stirring at 300rmp, slowly add the cobalt-chromium-zinc solution and the sodium hydroxide solution dropwise at the same time, the dropping time is 1.5h, the dropping is completed, adjust the pH to 8.5-9.5, and mature for half an hour. After washing wit...

Embodiment 3

[0035] (1) Mica pretreatment: 60-70°C water bath temperature, 2% hydrochloric acid to mica liquid-solid mass ratio of 20, stir for 30 minutes, wash and dry. Take 30g of pretreated mica (with a particle size of 5-25μm) to prepare 10wt% mica slurry.

[0036] (2) Composite pigment Co 0.5 Zn 0.5 Cr 2 o 4 / Mica precursor preparation, preparation of cobalt chromium zinc ion solution: 2.91gCo(NO 3 ) 2 .6H 2 O, 2.97gZn(NO 3 ) 2 .6H 2 O and 16gCr(NO 3 ) 3 .9H 2 O was added to 100ml of deionized water to form a mixed solution; 8g of sodium hydroxide was dissolved in water to form a solution equal in volume to the cobalt-chromium-zinc ion solution. Heat the mica slurry in a water bath to 70°C, under the condition of mechanical stirring at 300rmp, slowly add the cobalt-chromium-zinc solution and the sodium hydroxide solution dropwise at the same time, the dropping time is 1.5h, the dropping is completed, adjust the pH to 8.5-9.5, and mature for half an hour. After washing wit...

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Abstract

The invention discloses a coated mica pearlescent compound paint doped with a composite oxide and preparation thereof. The method comprises the following steps: adopting a precipitation method, heating mica pulp serving as a substrate to 65-75 DEG C, slowly dropwise adding cobalt, chromium and a mixed solution doped with metal ions while stirring; simultaneously dropwise adding an alkali solution, and then adjusting pH value to 8.5-9.5; filtering, washing and drying, calcining at 800 DEG C to obtain the compound paint, wherein nano-scale doped chromium cobalt green Co1-xMxCr2-yAlyO4 particles are formed on the surface of the compound paint; x is smaller than or equal to 0.5 and more than or equal to 0; y is smaller than or equal to 0.5 and more than or equal to 0; one of x and y is zero, and x and y are not 0 simultaneously; the doped metal M is one of Ni, Zn and Mg; a cladding layer at the surface of mica is compact and even; the doped compound paint is of green yellow color phase and shows soft pearly luster; the color phase value of the compound paint changes with the variety, the doping content and the coating rate of the doped elements, the compound paint with a plurality of color phases can be obtained; the compound paint is a novel high-performance mica pearlescent compound paint which is superior to a common mica pearlescent paint in performance and is simple in preparation technology.

Description

technical field [0001] The invention relates to a doped composite oxide-coated mica pearlescent composite pigment and its preparation, belonging to the field of preparation of micro-nano composite inorganic pigment particles. Background technique [0002] Mica is a layered silicate mineral containing sodium, potassium, aluminum, magnesium, iron, lithium and other metal elements. It has good high temperature resistance, good insulation and stable chemical properties. Pearlescent mica pigment is a composite pigment formed by coating mica with metal oxide on the surface of mica. It not only has the flashing effect of metallic pigments, but also produces the soft color of natural pearls, and has good acid and alkali resistance. , heat resistance, weather resistance. Pearlescent mica pigments can be divided into silver-white type, iridescent type and organic / inorganic coloring type according to the color category. The coloring type not only has a wide variety, but also has a com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/40C09C3/06
Inventor 叶明泉刘春兰韩爱军陈昕李志涛
Owner NANJING UNIV OF SCI & TECH
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