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Spherical zirconium silicate powder, preparation method and application thereof

A zirconium silicate and spherical technology, which is applied in the field of spherical zirconium silicate powder and its preparation, can solve the problems such as the inability to obtain spherical zirconium silicate, achieve good reflection effect, low thermal conductivity, good heat preservation and energy saving function. Effect

Inactive Publication Date: 2019-10-22
HUBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the main preparation methods of zirconium silicate are mostly solid-phase method and liquid-phase synthesis method. Among them, the zirconium silicate prepared by the solid-phase method has an irregular shape, which is square and bipyramidal, and the silicic acid prepared by the liquid-phase synthesis method The morphology of zirconium is flaky and donut-shaped, and zirconium silicate with spherical morphology cannot be obtained by both methods

Method used

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  • Spherical zirconium silicate powder, preparation method and application thereof
  • Spherical zirconium silicate powder, preparation method and application thereof
  • Spherical zirconium silicate powder, preparation method and application thereof

Examples

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preparation example Construction

[0028] The invention provides a preparation method of spherical zirconium silicate powder, comprising the following steps:

[0029] (1) mixing zirconium source with water and acid to obtain A solution;

[0030] (2) mixing the silicon source with water and / or an organic solvent to obtain a B solution;

[0031] (3) Mix the A solution with the B solution, and obtain a reaction precursor after ultrasonication;

[0032] (4) mixing the reaction precursor solution with a surfactant and a mineralizer, and carrying out a hydrothermal reaction to obtain spherical zirconium silicate powder;

[0033] The steps (1) and (2) are not limited by time sequence.

[0034] Unless otherwise specified, the raw materials used in the present invention are all commercially available.

[0035] In the invention, the zirconium source is mixed with water and acid to obtain A solution. In the present invention, the zirconium source is preferably one or more of zirconium sulfate, zirconium nitrate, zirco...

Embodiment 1

[0053] (1) Zirconium oxychloride is mixed with water and perchloric acid to obtain A solution, wherein the molar concentration of zirconium oxychloride is 0.20mol L -1 , the mol ratio of zirconium oxychloride and perchloric acid is=1:20;

[0054] (2) Sodium silicate is mixed with water to obtain solution B, wherein the molar ratio of sodium silicate to water is 1:150;

[0055] (3) Slowly add solution B to solution A, control the molar ratio of zirconium to silicon to be 1:1, and ultrasonically obtain the reaction precursor;

[0056] (4) Add sodium fluoride (the molar ratio of zirconium oxychloride to sodium fluoride is 1:0.2) and PVP (the addition amount is 5% of the total mass of the theoretical product) in the reaction precursor solution, and put it into the reaction kettle Hydrothermal reaction at 180°C for 12 hours, the filling degree of the reactor was maintained at 60%, centrifuged, washed and dried to obtain spherical zirconium silicate powder;

[0057] The steps (1) ...

Embodiment 2

[0065] 10g of spherical zirconium silicate powder prepared in Example 1 and glaze (20% of calcite, 15% of albite feldspar, 15% of potassium feldspar, 30% of calcined kaolin, 10% of barium carbonate, 10% of frit) 20g and Mix 100g of water evenly, apply it on a 2×2cm ceramic green body by spin coating (speed 600r / min, t=5min), and fire at 800°C for 20min to obtain a ceramic heat shielding material based on spherical zirconium silicate powder .

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Abstract

The invention provides spherical zirconium silicate powder, a preparation method and application thereof, and belongs to the technical field of heat shielding materials. The preparation method comprises the following steps: mixing a zirconium source with water and acid to prepare an A solution, mixing a silicon source with water and / or an organic solvent to prepare a B solution, then mixing the Asolution and the B solution, adding a surface active agent and a mineralizer for a hydrothermal reaction after ultrasonic treatment so as to obtain the spherical zirconium silicate powder, wherein theparticle size of the obtained spherical zirconium silicate powder is 0.5 to 5.0 microns and belongs to nearly submicron level, and the spherical zirconium silicate powder has relatively low heat conductivity and good reflection effect. The result of the embodiment indicates that the heat conductivity of the spherical zirconium silicate powder provided by the invention at the temperature of below400 DEG C is 0.04 to 0.149 W / (m*DEG C), the heat conductivity is reduced by nearly 10 times compared with commercial zirconium silicate, the reflectivity in a visible-near infrared region when the spherical zirconium silicate powder is used for the heat shielding material reaches more than 90%, and the spherical zirconium silicate powder has good heat preservation and energy-saving functions.

Description

technical field [0001] The invention relates to the technical field of heat shielding materials, in particular to a spherical zirconium silicate powder and its preparation method and application. Background technique [0002] Zirconium silicate (ZrSiO 4 ), commonly known as zircon, belongs to the tetragonal crystal system and is an island-shaped silicate mineral. Zirconium silicate has many excellent physical and chemical properties, such as good chemical stability, high temperature resistance, acid and alkali corrosion resistance, high melting point, high hardness, high refractive index, low thermal conductivity, low expansion coefficient, etc., and has a wide range of applications in the field of material science. use value. [0003] Studies have reported that spherical powders have the characteristics of large surface area, many pores, and good fluidity, and can be used as high-density bulk materials, biological and clinical catalysts, and adsorbent carriers. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/20C03C1/00C03C8/20C04B41/86
CPCC01B33/20C01P2004/32C01P2004/61C01P2004/62C01P2006/32C03C1/00C03C8/20C04B41/5022C04B41/86C04B41/4539C04B41/4578C04B41/0072
Inventor 雷丙龙彭珊陈仲秋高云
Owner HUBEI UNIV
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