Method for preparing aluminum hypophosphite

A technology of aluminum hypophosphite and sodium hypophosphite, applied in the direction of hypophosphorous acid, phosphorus oxyacid, etc., to achieve the effect of high yield, good quality and cheap raw materials

Inactive Publication Date: 2012-11-21
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to overcome the defects existing in the preparation method of aluminum hypophosphite, and provide a new preparation method of aluminum hypophosphite. The technical problem to be solved is to make th

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  • Method for preparing aluminum hypophosphite
  • Method for preparing aluminum hypophosphite

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add 7.7 g of sodium hypophosphite and 110 mL of water into a 500 mL four-necked flask equipped with a serpentine reflux condenser, an electric stirrer and a thermometer, stir to dissolve, and add sulfuric acid dropwise to adjust the pH to 3.

[0029] Heat the sodium hypophosphite solution to 40°C, add 50 mL of a solution containing 8.3 g of aluminum sulfate octadecahydrate, and react for 2 h to obtain a white precipitate. Filter, wash, and dry to obtain a white powder product. The yield was 80.9%.

Embodiment 2

[0031] Add 7.7 g of sodium hypophosphite and 110 mL of water into a 500 mL four-neck flask equipped with a serpentine reflux condenser, an electric stirrer and a thermometer, stir to dissolve, and adjust the pH to 3.

[0032] Heat the sodium hypophosphite solution to 50°C, add dropwise 50 mL of a solution containing 8.3 g of aluminum sulfate octadecahydrate, and react for 2 h to obtain a white precipitate. Filter, wash, and dry to obtain a white powder product. The yield was 91.9%.

Embodiment 3

[0034] Add 7.7 g of sodium hypophosphite and 110 mL of water into a 500 mL four-necked flask equipped with a serpentine reflux condenser, an electric stirrer and a thermometer, stir to dissolve, and adjust the pH to 4.

[0035] Heat the sodium hypophosphite solution to 80°C, add dropwise 50 mL of a solution containing 8.3 g of aluminum sulfate octadecahydrate, and react for 2 h to obtain a white precipitate. Filter, wash, and dry to obtain a white powder product. The yield was 95.9%.

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Abstract

The invention relates to a method for preparing aluminum hypophosphite. The method includes the following steps of firstly, preparing sodium hypophosphite solution with concentration of 2-6mol/L, adjusting pH (potential of hydrogen) to be 3-5 preferentially within 3-6.5; secondly, preparing aluminum sulfate solution; and thirdly, subjecting the sodium hypophosphite solution and the aluminum sulfate solution to reaction by heating on the acid condition to generate aluminum hypophosphite. The aluminum sulfate is added into the sodium hypophosphite solution for reaction within a certain temperature range, so that harms caused by volatilization of hypophosphorous acid during preparing of the aluminum hypophosphite are avoided, operation is simplified, yield of products is high, cost is low and industrialization is easy to realize.

Description

technical field [0001] The invention relates to a preparation method of a compound, in particular to a preparation method of aluminum hypophosphite. Background technique [0002] The phosphorus content in aluminum hypophosphite is high, and the thermal stability and hydrolytic stability are good. It adopts the condensed phase flame retardant method, which can catalyze the carbonization of the body substances. It can complement the advantages and enhance the flame retardant performance when used in conjunction with other flame retardants. It is a highly efficient synergistic flame retardant. [0003] In 2011, Cheng Xiantao and others reported the flame retardancy of aluminum hypophosphite synergistic melamine cyanurate on EPDM rubber. Because of its white color and small addition amount, the prepared flame retardant has good processing performance and flame retardancy. Performance and mechanical properties (Cheng Xiantao, Jiang Hongwei. Research on flame retardant EPDM rubbe...

Claims

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Application Information

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IPC IPC(8): C01B25/165C08K3/32C08L101/00
Inventor 职慧珍杨锦飞黄小冬
Owner NANJING NORMAL UNIVERSITY
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