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Preparation method of leucite

A technology of leucite and analcite, applied in the field of dental materials, can solve the problems of uneven particle size distribution of leucite powder, high energy consumption, difficult particle size control, etc., and is suitable for large-scale popularization and application. Low consumption and adjustable particle size

Inactive Publication Date: 2016-01-27
HENAN 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 provide a preparation method of leucite, so as to solve the problem of preparing leucite powder in the prior art, which requires calcining and grinding processes, high energy consumption, uneven particle size distribution of leucite powder, and unmanageable problem

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  • Preparation method of leucite
  • Preparation method of leucite
  • Preparation method of leucite

Examples

Experimental program
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Embodiment 1

[0028] The preparation method of the leucite of the present embodiment may further comprise the steps:

[0029] 1) Add 30 mL of 10 mol / L sodium hydroxide solution into a single-necked flask, add 24 g of aluminum hydroxide powder under stirring conditions (the molar ratio of sodium hydroxide to aluminum hydroxide is 1.0), heat and reflux for 7 hours, and then put The obtained suspension solution was subjected to suction filtration, washed with water for 3 times, and the filtrate was collected to obtain a sodium metaaluminate solution, which was diluted to 1.5 mol / L;

[0030] 2) At a stirring speed of 200r / min, add the sodium metaaluminate solution obtained in step 1) dropwise to the mixed solution of sodium silicate solution and PVP, and then stir and react for 10 minutes after the dropwise addition to form a milky white gel Mixture; wherein, the concentration of sodium silicate solution is 1.5mol / L, every 1.5mol sodium silicate is added PVP12g, and the molar ratio of sodium si...

Embodiment 2

[0034] The preparation method of the leucite of the present embodiment may further comprise the steps:

[0035] 1) Add 30 mL of 10 mol / L sodium hydroxide solution into a single-necked flask, add 26 g of aluminum hydroxide powder under stirring conditions (the molar ratio of sodium hydroxide to aluminum hydroxide is 1.1), heat and reflux for 9 hours, and then put The obtained suspension solution was subjected to suction filtration, washed with water for 3 times, and the filtrate was collected to obtain a sodium metaaluminate solution, which was diluted to 1.5 mol / L;

[0036] 2) At a stirring speed of 250r / min, add the sodium metaaluminate solution obtained in step 1) dropwise to the mixed solution of sodium silicate solution and PVP, and then stir and react for 10 minutes after the dropwise addition to form a milky white gel Mixture; wherein, the concentration of sodium silicate solution is 2.0mol / L, every 2.0mol sodium silicate is added PVP20g, and the molar ratio of sodium si...

Embodiment 3

[0040] The preparation method of the leucite of the present embodiment may further comprise the steps:

[0041] 1) Add 30 mL of sodium hydroxide solution with a concentration of 10 mol / L into a single-necked flask, add 26 g of aluminum hydroxide powder under stirring (the molar ratio of sodium hydroxide to aluminum hydroxide is 1.1), heat and reflux for 5 hours, and then put The obtained suspension solution was subjected to suction filtration, washed with water for 3 times, and the filtrate was collected to obtain a sodium metaaluminate solution, which was diluted to 3mol / L;

[0042]2) At a stirring speed of 300r / min, add the sodium metaaluminate solution obtained in step 1) dropwise to the mixed solution of sodium silicate solution and PVP, and then stir and react for 12 minutes after the dropwise addition to form a milky white gel Mixture; wherein, the concentration of sodium silicate solution is 3.0mol / L, every 3.0mol sodium silicate is added PVP20g, and the molar ratio of ...

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Abstract

The application discloses a preparation method of leucite. The method comprises the following steps: 1) adding aluminium hydroxide into a sodium hydroxide solution, carrying out a heating reflux reaction, filtering, washing, and collecting a filtrate to obtain a sodium metaaluminate solution; 2) adding the sodium metaaluminate solution into a mixed solution of a sodium silicate solution and polyvinylpyrrolidone, stirring and reacting to obtain a mixture; 3) carrying out a hydrothermal reaction on the mixture at 150-220 DEG C for 3-6 h, filtering, washing, and drying to obtain analcite; and 4) adding analcite into a potassium nitrate solution and carrying out a hydrothermal reaction at 150-250 DEG C for 3-6 h, filtering, washing and drying so as to obtain leucite. According to the method, leucite is prepared by combination of a hydrothermal method and an ion exchange method. The method has characteristics of low reaction temperature, easy operation, low energy consumption and no pollution. Particle size of leucite powder is controllable and small, and particle size distribution is narrow.

Description

technical field [0001] The invention belongs to the technical field of dental materials, and in particular relates to a preparation method of leucite. Background technique [0002] Dental ceramics have excellent light transmission and light reflection properties, can reproduce the translucency and color of natural teeth, have good biocompatibility, do not degrade in the oral environment, polished and glazed porcelain surfaces are smooth, and have the same wear resistance as natural teeth Approximation and other significant advantages. In the 1950s, research found that leucite crystals (molecular formula: K(AlSi 2 o 6 )) can increase the thermal expansion coefficient of porcelain, so that it can be fused to certain alloys to make a strong and beautiful restoration, marking the birth of metal-based porcelain restoration technology. Since then, most dental ceramics for porcelain restorations have used leucite as the main crystalline phase. At the same time, leucite has good...

Claims

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Application Information

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IPC IPC(8): C04B35/16C04B35/626
Inventor 杜西刚王春伟徐锐米刚张军姚海瑞李华博
Owner HENAN UNIV OF SCI & TECH
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