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Ammonium polyphosphate and laminated dihydroxyl hydroxide nano-composite and preparation method thereof

A nanocomposite, ammonium polyphosphate technology, applied in the direction of phosphorus compounds, chemical instruments and methods, alumina/aluminum hydroxide, etc., can solve the problems of low ammonium polyphosphate yield and high water solubility of ammonium polyphosphate, etc. Achieve the effects of low cost, improved flame retardant effect, and simple raw materials

Active Publication Date: 2013-09-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Due to the large amount of urea used in this method, the yield of ammonium polyphosphate is not high, about 50%. This method generally obtains a mixture of type I ammonium polyphosphate and type II ammonium polyphosphate, and The obtained ammonium polyphosphate is more water soluble

Method used

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  • Ammonium polyphosphate and laminated dihydroxyl hydroxide nano-composite and preparation method thereof
  • Ammonium polyphosphate and laminated dihydroxyl hydroxide nano-composite and preparation method thereof
  • Ammonium polyphosphate and laminated dihydroxyl hydroxide nano-composite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Add 1,580 grams of phosphorus pentoxide, 1,400 grams of diammonium hydrogen phosphate, 180 grams of urea, and 350 grams of magnesium-aluminum-type layered double hydroxide into the reactor, raise the temperature to 250°C and start passing ammonia, and maintain the ammonia pressure at normal pressure , and then continue to heat up to 300°C, and ammonium for 90 minutes to obtain ammonium polyphosphate and layered double hydroxide nanocomposite, in which the layered double hydroxide is completely peeled off, and the purity of crystalline type I ammonium polyphosphate is 100 %, its X-ray diffraction pattern is as figure 1 shown.

Embodiment 2

[0044] Add 1,580 grams of phosphorus pentoxide, 1,400 grams of diammonium hydrogen phosphate, and 350 grams of calcium-aluminum type layered double hydroxyhydroxide into the reaction system, heat up to 200°C and start passing ammonia, maintain the ammonia pressure at 0.1 MPa, and then continue to heat up to Ammonium polyphosphate and layered double hydroxide nanocomposites were obtained by ammoniation at 300°C for 90 minutes, in which the layered double hydroxide was completely peeled off, and the purity of crystalline type I ammonium polyphosphate was 100%, and its X-ray Diffraction pattern such as figure 1 shown.

Embodiment 3

[0046] Add 474 grams of phosphorus pentoxide, 440 grams of diammonium hydrogen phosphate, and 60 grams of urea into the reactor, raise the temperature to 250°C and start passing ammonia, keep the ammonia pressure at normal pressure, then continue to heat up to 300°C, and then add 105 grams of zinc Aluminum-type layered double hydroxyhydroxide is added to the reaction kettle, and it is ammoniated for 90 minutes. The purity of the obtained crystalline type II ammonium polyphosphate is 100%, and its X-ray diffraction pattern is as follows: figure 2 shown.

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Abstract

The invention relates to an ammonium polyphosphate and laminated dihydroxyl hydroxide (hydrotalcite-like) nano-composite and a preparation method thereof, and belongs to the technical field of purification, stabilization and concentration of phosphorus compounds. The nano-composite comprises 70-99% of ammonium polyphosphate and 1-30% of dihydroxyl laminated hydroxide based on 100% total weight of the nano-composite. The nano-composite provided by the invention is simple in process, simple in raw material and low in cost. The nano-composite reduces the water solubility of ammonium polyphosphate prepared, and has the effect of improving the flame retardance in flame retardancy of polymer materials.

Description

technical field [0001] The invention relates to a nanocomposite of ammonium polyphosphate and layered double hydroxyhydroxide (hydrotalcite-like) and a preparation method thereof, belonging to the technical field of purification, stabilization and concentration of phosphorus compounds. Background technique [0002] Ammonium polyphosphate (ammonium polyphosphate), abbreviated as APP, its general formula is (NH 4 ) n+2 P n o 3n+1 , when n is large enough, it can be written (NH 4 PO 3 ) n , whose structure is as follows. [0003] [0004] Ammonium polyphosphate is white powder, long-chain ammonium polyphosphate is difficult to dissolve in water, and the solubility of general industrial ammonium polyphosphate in water is 1.3 g / 100 ml (15°C) or 3.0 g / 100 ml (25°C). The hygroscopicity of ammonium polyphosphate decreases with the increase of the degree of polymerization, and the hygroscopicity of industrial ammonium polyphosphate is less than 10% when stored in air at 25°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/38C01F7/02B82Y30/00
Inventor 仪德启杨荣杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY