Preparation method of highly dispersed aluminum orthophosphite crystals

A technology of aluminum phosphite and high dispersibility, which is applied in the field of materials, can solve the problems of by-products and other problems, and achieve the effects of energy saving, simple operation and reduced impact

Active Publication Date: 2013-05-15
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the metathesis method not only produces by-products, but also forms industrial waste water

Method used

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  • Preparation method of highly dispersed aluminum orthophosphite crystals
  • Preparation method of highly dispersed aluminum orthophosphite crystals

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Embodiment 1

[0023] Weigh AlCl 3 ·6H 2 Dissolve 4.1 g of O2 in 200 mL of distilled water, add 15% ammonia water to AlCl drop by drop 3 solution to a slight excess of ammonia water, filter the resulting precipitate, and wash with distilled water several times until there is no Cl in the washing liquid. - . Add 50mL of distilled water to the washed gel and stir to obtain aluminum hydroxide sol, add aluminum hydroxide sol to 25% hypophosphorous acid, stir while adding, stop adding when the pH of the solution is 3-4, continue stirring to complete the reaction. The obtained solution was filtered, and the filtrate was heated to 85° C., and aluminum phosphite was precipitated. After filtering and drying, 25.2 grams of well-dispersed aluminum phosphite crystals were obtained.

Embodiment 2

[0025] Weigh Al 2 (SO 4 ) 3 18H 2 O3 3.3 g was dissolved in 200 mL of distilled water, and 15% ammonia water was added dropwise to Al 2 SO 4 A slight excess of ammonia water in the solution, filtered to form a precipitate, washed with distilled water several times, until there is no SO in the washing liquid 4 2- . Add 80 mL of distilled water to the washed gel and stir to obtain aluminum hydroxide sol, add aluminum hydroxide sol to 50% hypophosphorous acid, stir while adding, stop adding when the pH of the solution is 4-5, and continue stirring to complete the reaction. The obtained solution was filtered, and the filtrate was heated to 90° C., and aluminum phosphite was precipitated. After filtering and drying, 25.8 grams of well-dispersed aluminum phosphite crystals were obtained.

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Abstract

The invention discloses a method for synthesizing highly dispersed aluminum orthophosphite crystals from an aluminum salt and hypophosphorous acid. The method is characterized in that the method comprises the following steps: (1) using the aluminum salt to prepare an aluminum hydroxide gel, filtering and washing till a washing solution has no anions of the aluminum salt; (2) adding distilled water into the gel after washing, stirring to get an aluminum hydroxide sol, adding the sol into the hypophosphorous acid while stirring, and continuously stirring to realize full reaction after dripping; and (3) filtering and heating an obtained solution, separating out aluminum orthophosphite, filtering, and drying to get the uniform and well-dispersed aluminum orthophosphite crystals. Compared with the prior art, the method disclosed by the invention has the advantages of simple process, energy conservation, environmental protection, high product yield and purification and short production period, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing highly dispersed aluminum phosphite crystals, belonging to the technical field of materials. Background technique [0002] Compared with anti-rust pigments red lead and zinc chromate, phosphites are a kind of economical and excellent non-toxic anti-rust pigments. It not only has the corrosion resistance, high temperature resistance and rust resistance performance of other inorganic pigments, but also has good stability, pollution-free and easy preparation. Adding phosphite to the primary preservative will significantly improve the anti-corrosion, anti-rust and anti-bubble properties of the coating without reducing the stability of the coating. Therefore, the research and development of phosphite pigments have broad prospects. Among them, when aluminum phosphite is used as an antirust pigment, its antirust performance can rival the best industrial zinc chromate antirust agent. [0003] At present, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/163
Inventor 郭爱红白丽梅田力男牛福生
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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