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Hydrothermal synthesis of zinc phlogopite

A technology of phlogopite and hydrate, which is applied in the field of hydrothermal synthesis of zinc phlogopite, which can solve the problems of smoothness, transparent crystal formation, thinness of sheet matrix, temperature and pressure unsatisfactory

Inactive Publication Date: 2015-12-02
BASF SE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the method presented therein is not satisfactory in terms of the morphology of the sheet material, the smoothness of the sheet, the transparency, the purity of the crystal formation, the length of the preparation time, the diameter, the thinness of the sheet matrix, and the required temperature and pressure. satisfying

Method used

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  • Hydrothermal synthesis of zinc phlogopite
  • Hydrothermal synthesis of zinc phlogopite
  • Hydrothermal synthesis of zinc phlogopite

Examples

Experimental program
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Embodiment 1

[0309] The starting reagent is Al(NO 3 ) 3 , Zinc Sulfate Heptahydrate, Potassium Hydroxide and Colloidal Silicon Dioxide. The 6M KOH solution was added to the zinc sulfate heptahydrate and the mixture was stirred for about 5 minutes. Add 6MKOH to Al(NO 3 ) 3 medium and swirl the contents to mix. Combine the two mixtures. The reaction mixture was transferred to a stirred Parr reactor and colloidal silica was added, forming a gel. The reactor was heated for 8 hours to reach a temperature of 200°C and held at this temperature for 24 hours. When cooled to room temperature, the reaction was filtered and washed with D.I. water to give a white powder. The reactants are added in non-stoichiometric ratios. The preparation followed that in Komarneni et al., Clays and ClayMinerals, Vol. 51, #6, 693, 2003, except that colloidal silicon dioxide was substituted for H 2 SiO 3 as a source of silicon. The size distribution is d(10): 1.5 μm, d(50): 5.5 μm, and d(90): 16.7 μm.

[03...

Embodiment 2

[0312] Example 2 used aluminum nitrate as the source of aluminum, was run under static mixing conditions and colloidal silica as the source of silicon. The reactants are added in stoichiometric ratios. FIG. 3 shows the morphology of the sheet-shaped body formed in Example 2. FIG. The morphology of these platelets is very different from that shown in Figure 1 . The particle size distribution is: d(10): 0.8 μm, d(50): 2.9 μm, d(90): 27.1 μm.

[0313] Zinc Phlogopite KZn 3 AlSi 3 o 10 (OH) 2 Synthesis

[0314] Table 1—Reactants and reaction conditions of Examples 1-4

[0315]

Embodiment 3

[0317] The flakes formed by the hydrothermal method of the present invention are coated with TiO according to well-known methods of the prior art. 2 Coated to form effect pigments.

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Abstract

This invention relates to a synthetically derived zinc phlogopite platelets, of superior platelet diameter, effect pigments comprising such synthetically derived platelets and methods of forming said substrates. More specifically the disclosure describes an improved hydrothermal synthesis of zinc phlogopite suitable as a platelets for interference pigments, barrier and flame retardant applications.

Description

[0001] This application claims the benefit of US Provisional Application Serial No. 61 / 776,228, filed March 11, 2013, which is hereby incorporated by reference in its entirety. technical field [0002] The application relates to the synthesis of zinc phlogopite flakes and an improved method for preparing synthetic zinc phlogopite flakes by means of low-temperature, low-pressure hydrothermal conditions. Background technique [0003] Natural mica is mined in the presence of sand, kaolin, feldspar and other silicates and contains various impurities such as iron oxides and heavy metals. Due to the presence of these other impurities, mica is usually discolored. This discoloration is of course an undesirable characteristic of natural materials, especially when mica is used as platelet, core or matrix for interference pigments, barrier coatings and the like. [0004] In addition, natural mica must be ground to produce flakes. This grinding does not allow tight control over the sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/00C01B33/38C01F7/00C09C1/04C09D7/61
CPCA61K8/27A61K8/0254A61K8/26A61K2800/10A61Q19/00C01B33/26C01P2002/72C01P2004/03C01P2004/20C01P2006/60C08K3/22C08K3/346C08K9/02C08K9/10C09C1/0015C09C1/0024C09C1/04C09D5/00C09D7/1216C09D7/1291C09D11/037C09D11/17C09D11/322C30B7/10C30B29/34C30B29/64Y10T428/2982C08K2201/016C09D7/70C09D7/61
Inventor M·C·麦圭尔I·布尔G·M·约翰逊
Owner BASF SE