Method for preparing laminar alpha-Al2O3 pearlescent pigment base material by use of compound aluminum salt

A flaky, aluminum salt technology, applied in the field of materials, can solve the problems of small particle size of flaky alumina, small particle size, and increased raw material cost, so as to reduce transformation and growth temperature, reduce raw material cost, and facilitate crystal seeds Easy to get effect

Inactive Publication Date: 2015-09-23
TSINGHUA UNIV
View PDF12 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the methods used in the domestic invention patents involved (CN 1150165A, CN 101541681A, CN 1936114A and CN 101660204A) choose simple inorganic aluminum salts as the aluminum source, such as aluminum sulfate, and need to add a mixture of potassium sulfate and sodium sulfate as an additional Molten salt medium, one or two of titanyl sulfate, tin sulfate, zinc sulfate and sodium phosphate are crystal growth regulators, and then calcined at high temperature, the process is relatively complicated, and the prepared flaky α-Al 2 o 3 The properties are mixed, and the thin-flaky α-Al obtained by high-temperature calcination 2 o 3 The properties basica

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing laminar alpha-Al2O3 pearlescent pigment base material by use of compound aluminum salt
  • Method for preparing laminar alpha-Al2O3 pearlescent pigment base material by use of compound aluminum salt
  • Method for preparing laminar alpha-Al2O3 pearlescent pigment base material by use of compound aluminum salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) 46.5g KAl(SO 4 ) 2 12H 2 O was dissolved in 150mL deionized water to obtain KAl(SO 4 ) 2 12H 2 O saturated aqueous solution, then add 0.11g TiOSO 4 (purity 93%) or 3.7gTiCl 4 The aqueous solution (mass percentage concentration is 3.2%), after it dissolves, fully stirs 30min, obtains suspension a;

[0050] 2) 15.6g anhydrous Na 2 CO 3 and 0.27g Na 3 PO 4 12H 2 O was dissolved in 150mL deionized water to prepare solution b;

[0051] 3) Add solution b to suspension a and fully stir at room temperature to carry out hydrolysis reaction. The reaction time is 1 hour. After the reaction is completed, a gel mixture is obtained. Evaporate and dry the above-mentioned gel mixture, grind the dried gel into powder and pass through a 100-mesh standard sieve (2 o 3 .

[0052] The flaky α-Al 2 o 3 The thickness is 0.2μm-0.5μm, the average particle size is 11μm and the distribution is uniform, the aspect ratio is greater than 20, and there is no twinning and agglomerat...

Embodiment 2

[0054] 1) 46.5g KAl(SO 4 ) 2 12H 2 O was dissolved in 150mL deionized water to obtain KAl(SO 4 ) 2 12H 2 Saturated aqueous solution of O, add 0.11g TiOSO 4 (purity 93%) or 3.7gTiCl 4 aqueous solution (mass percentage concentration is 3.2%), after it dissolves, add 0.25g flake α-Al 2 o 3 As a seed crystal, stir thoroughly for 30 minutes to obtain a suspension a; the flaky α-Al used as a seed crystal in this step 2 o 3 Seed crystal is the product obtained in Example 1;

[0055] 2) 15.6g anhydrous Na 2 CO 3 and 0.13g Na 3 PO 4 12H 2 O was dissolved in 150mL deionized water to prepare solution b;

[0056] 3) Add solution b to suspension a and fully stir at room temperature to carry out hydrolysis reaction. The reaction time is 1 hour. After the reaction is completed, a gel mixture is obtained. Evaporate and dry the above gel mixture, grind the dried gel into powder and pass through a 100-mesh standard sieve (2 o 3 .

[0057] The flaky α-Al 2 o 3 The X-ray diffr...

Embodiment 3-8

[0060] The method of Examples 3-8 is similar to that of Example 2, except that the amount of additives is different, and the detailed conditions are as described in Table 1. The obtained flaky α-Al 2 o 3 The characteristics are shown in Table 2.

[0061] Table 1, embodiment 1-8 experimental conditions

[0062]

[0063]

[0064] In table 1, the molar ratio of titanium source / aluminum source (molar ratio) that is crystal growth regulator and water-soluble composite aluminum salt;

[0065] Na 3 PO 4 12H 2 O / Al source (molar ratio) also Na 3 PO 4 12H 2 O and step 1) in the mol ratio of water-soluble composite aluminum salt;

[0066] Seed crystal / aluminum source (molar ratio) that is, flake α-Al 2 o 3 The mol ratio of crystal seed and described water-soluble composite aluminum salt;

[0067] Table 2, the obtained flaky alumina characteristics of Examples 1-8

[0068] Example

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing a laminar alpha-Al2O3 pearlescent pigment base material by use of compound aluminum salt. The compound aluminum salt (aluminium potassium sulfate or aluminum sodium sulfate) is selected as the aluminium source, and is hydrolyzed to produce a required fused salt in situ; under the condition of adding laminar alpha-Al2O3 seed crystals and crystal growth regulators (a titanium salt and a phosphate), a gel produced by reaction is dried and calcined at 850-1100 DEG C to prepare laminar alpha-Al2O3 with favorable properties, so that the method is simple in process. The obtained laminar alumina (0.2-0.5 [mu]m in average thickness, 11-15 [mu]m in average particle diameter, larger than 20 in diameter-to-thickness ratio and no clustering or crystal twinning) can serve as the pearlescent pigment base material.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for preparing flake-shaped α-Al by using a composite aluminum salt 2 o 3 Method for pearlescent pigment substrates. Background technique [0002] Due to the fact that natural mica contains impurities and has an uneven diameter-thickness ratio after grinding, traditional mica titanium pearlescent pigments have defects in pearlescent properties such as color and color saturation, while artificially synthesized flake substrates (such as flake iron oxide, Flaky titanium oxide, flake aluminum oxide) have become new research hotspots for pearlescent pigment substrates due to their high refractive index. In particular, flaky α-Al 2 o 3 Due to the advantages of high melting point, high hardness, high stability, crystal morphology and controllable diameter-thickness ratio during the synthesis process, it becomes an ideal substrate for high-quality pearlescent pigments, which can be fur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01F7/02
Inventor 王毅李磊祁光霞袁超雷雪飞徐辉孙应龙尹丽丹
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap