Preparation method of pearlescent pigment taking flaky alpha-aluminum oxide as matrix

A pearlescent pigment and aluminum oxide technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of affecting the pearl luster of pearlescent pigments, affecting the gloss of pearlescent pigments, and the weather resistance needs to be improved, achieving remarkable results. Pearlescent effect, more cool and individual appearance, high chemical stability and mechanical stability

Active Publication Date: 2022-07-08
GUIYANG VOCATIONAL & TECHNICAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional ordinary pigments can no longer meet people's requirements. Due to different color rendering principles, pearlescent pigments have optical characteristics such as pearlescent effect, angle-dependent color effect, metallic flash effect, color transfer effect, and color enhancement effect. They can be used in cosmetics. , automotive paint, paint, packaging, printing and other fields that have high requirements for color
However, since the first generation of pearlescent pigments is made of natural or synthetic mica, it has the following disadvantages: ①It has a large thickness and a wide range of thickness distribution
These impurities will affect the gloss of pearlescent pigments, and the removal of impurities is not only time-consuming and expensive
③The crushing and grading process is easy to damage the surface, increase the surface roughness, and finally affect the pearl luster of pearlescent pigments
④The heat resistance is not high (the mechanism is destroyed at around 800°C). Although there are already some pearlescent pigments with certain weather resistance on the market, these pearlescent pigments are still irresistible for outdoor products such as automobiles. Sun exposure, its weather resistance needs to be improved
This greatly limits its scope of application

Method used

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  • Preparation method of pearlescent pigment taking flaky alpha-aluminum oxide as matrix
  • Preparation method of pearlescent pigment taking flaky alpha-aluminum oxide as matrix
  • Preparation method of pearlescent pigment taking flaky alpha-aluminum oxide as matrix

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Effect test

preparation example Construction

[0044] like figure 1 As shown, a method for preparing pearlescent pigments based on flaky α-alumina, which comprises the following steps:

[0045] s1, in sheet α-Al 2 O 3As the base liquid, add adsorbent and acidic pH adjuster I to prepare flaky α-Al 2 O 3 Aqueous suspension solution with negative charge on the surface;

[0046] s2, adding a metal salt solution and an alkaline pH regulator II to the aqueous suspension solution to carry out a hydrolysis coating reaction to obtain a pearlescent pigment precursor;

[0047] s3, filtering, washing and drying the pearlescent pigment precursor, and calcining the dried precursor to obtain the pearlescent pigment.

[0048] specifically,

[0049] First, continuously heat the matrix solution, add adsorbent and acidic pH adjuster I, and perform ultrasonic dispersion and vigorous stirring; preferably, the continuous heating temperature is kept at 60-90 °C, and ultrasonic dispersion should be performed for 15 minutes before preparing ...

Embodiment 1

[0071] Take 5g of flake α-Al 2 O 3 , 0.03g of sodium polyacrylate was added to 100ml of deionized water, and the pH value of the solution was adjusted to 2. First, vigorously stir with a magnetic stirrer for 60 min, and then ultrasonically disperse for 15 min. During this process, the temperature of the solution is kept at 80°C. While maintaining the slow stirring of the suspension with a magnetic stirrer, slowly add 50 ml of ferric chloride with a mass fraction of 10%, and at the same time add a 10% mass fraction of sodium hydroxide solution to adjust the pH value, so that the pH value is changed from 2.0 slowly rises to 3.0. Continue to stir slowly for 5min, stop stirring, filter out the suspended solid while hot, wash with water and then dry to obtain Fe 2 O 3 / Al 2 O 3 The precursor of iron-based pearlescent pigments.

[0072] The pearlescent pigment precursor was placed in a muffle furnace for calcination at 830 °C for 60 min. The calcined product is taken out as ...

Embodiment 2

[0074] No adsorbent is added;

[0075] Take 5g of flake α-Al 2 O 3 , was added to 100 ml of deionized water, and the pH value of the solution was adjusted to 2. First, vigorously stir with a magnetic stirrer for 60 min, and then ultrasonically disperse for 15 min. During this process, the temperature of the solution is kept at 80°C. While maintaining the slow stirring of the suspension with a magnetic stirrer, slowly add 50 ml of ferric chloride with a mass fraction of 10%, and at the same time add a 10% mass fraction of sodium hydroxide solution to adjust the pH value, so that the pH value is changed from 2.0 slowly rises to 3.0. Continue to stir slowly for 5min, stop stirring, filter out the suspended solid while hot, wash with water and then dry to obtain Fe 2 O 3 / Al 2 O 3 The precursor of iron-based pearlescent pigments.

[0076] The pearlescent pigment precursor was placed in a muffle furnace for calcination at 830 °C for 60 min. The calcined product is taken ou...

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Abstract

The invention discloses a method for preparing pearlescent pigment by taking flaky alpha-aluminum oxide as a matrix, which comprises the following steps: firstly, taking flaky alpha-Al2O3 as a matrix liquid, and adding an adsorbent and an acidic pH regulator I to prepare a water suspension solution with negative charges on the surface of the flaky alpha-Al2O3; adding a metal salt solution and an alkaline pH regulator II into the aqueous suspension solution, and carrying out hydrolysis coating reaction to obtain a pearlescent pigment precursor; and finally, filtering, washing, drying and calcining the pearlescent pigment precursor to obtain the pearlescent pigment. The prepared pearlescent pigment can present a remarkable pearlescent effect, and the pigment has relatively high chemical stability and mechanical stability; and the application range is wide, and the coating can be applied to long-term outdoor service products and high-temperature environments.

Description

technical field [0001] The invention relates to a method for preparing pearlescent pigments based on flake α-alumina, belonging to the field of pigment preparation. Background technique [0002] With the advent of the "face-seeing" era, people gradually put forward higher requirements for color. Traditional ordinary pigments can no longer meet people's requirements. Pearlescent pigments have optical characteristics such as pearlescent effect, varicoloration effect, metallic glitter effect, color transfer effect, and color enhancement effect due to different color rendering principles, which can be used in cosmetics. , automotive paint, coating, packaging, printing and other fields that have higher requirements for color. However, since the first generation of pearlescent pigments is made of natural or synthetic mica as the matrix, it has the following disadvantages: 1. It has a large thickness and a wide range of thickness distribution. Therefore, when the metal oxide is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00C09C3/04C09C3/06
CPCC09C1/0021C09C3/063C09C3/043C09C3/006C09C2200/1004C09C2200/401C09C2200/505
Inventor 刘风坤龙开琳姚建波黄毅崔博文朱化强何美琪陈志豪
Owner GUIYANG VOCATIONAL & TECHNICAL COLLEGE
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