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Method for preparing core-shell type silicon dioxide coated ammonium phosphate based on reversed-phase micro-emulsion method

A technology for coating ammonium phosphate and silicon dioxide, which is applied in chemical instruments and methods, dyeing low-molecular-weight organic compound treatment, inorganic pigment treatment, etc. It can solve the problems of large particle size and wide particle size distribution, and achieve thermal stability. High property, increase decomposition temperature and reduce water solubility

Inactive Publication Date: 2016-04-20
王虹 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle size of the product obtained by this method is 5-50 microns, the particle size is relatively large, and the particle size distribution is relatively wide

Method used

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  • Method for preparing core-shell type silicon dioxide coated ammonium phosphate based on reversed-phase micro-emulsion method
  • Method for preparing core-shell type silicon dioxide coated ammonium phosphate based on reversed-phase micro-emulsion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of core-shell silica-coated ammonium phosphate in this embodiment is carried out according to the following steps:

[0026] (1) Under normal temperature conditions, take 4g of n-hexane, 2.4g of Span-80 and 0.6g of Tween-80, mix and stir for 15min, then add 1g of phosphoric acid, add 0.9g of n-pentanol after stirring for 15min, continue to stir for 0.5h, and get transparent 的 Reverse Microemulsion A;

[0027] (2) Under normal temperature conditions, take 3g of n-hexane, 1.7g of Span-80 and 0.6g of Tween-80, mix and stir for 15 minutes, then add a diluted ammonia solution of 0.7g of ammonia and 0.7g of ethanol, and continue to stir for 0.5h to obtain a transparent 的 Reverse Microemulsion B;

[0028] (3) The temperature is controlled to 10℃, and the inverse microemulsion A is poured into a four-necked flask with a stirrer. The stirring speed is set to 350r / min and kept for 10 minutes, and then the inverse microemulsion B is added dropwise to the fourth bottl...

Embodiment 2

[0032] The preparation method of core-shell silica-coated ammonium phosphate in this embodiment is carried out according to the following steps:

[0033] (1) Under normal temperature conditions, take 4g of n-hexane, 2.4g of Span-80 and 0.6g of Tween-80, mix and stir for 15min, then add 1g of phosphoric acid, add 0.9g of n-pentanol after stirring for 15min, continue to stir for 0.5h, and get transparent 的 Reverse Microemulsion A;

[0034] (2) Under normal temperature conditions, take 3.2g of n-hexane, 1.8g of Span-80 and 0.6g of Tween-80, mix and stir for 15min, then add dilute ammonia prepared by 0.75g of ammonia and 0.75g of ethanol, and continue to stir for 0.5h to obtain Transparent reverse microemulsion B;

[0035] (3) Control the temperature to 0-20℃, pour the reverse microemulsion A into a four-necked bottle with a stirrer, set the stirring speed to 300r / min, keep it for 10 minutes, and then add the reverse microemulsion B dropwise Into the four-necked flask, the dropping rate...

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Abstract

The invention discloses a method for preparing core-shell type silicon dioxide coated ammonium phosphate based on a reversed-phase micro-emulsion method. The method comprises the following steps: (1) preparing reversed-phase micro-emulsion A of non-ionic surfactant / n-hexane / phosphoric acid; (2) preparing reversed-phase micro-emulsion B of non-ionic surfactant / n-hexane / ammonia water; (3) mixing the reversed-phase micro-emulsion A and the reversed-phase micro-emulsion B to obtain dispersion liquid of nano-particles; (4) dropwise adding a n-hexane solution of tetraethyl orthosilicate into the dispersion liquid of the nano-particles to obtain dispersion liquid of core-shell type silicon dioxide coated ammonium phosphate; and (4) dropwise adding a n-hexane solution of a silane coupling agent into the dispersion liquid of the core-shell type silicon dioxide coated ammonium phosphate, and then carrying out emulsion breaking, separation and drying treatments to obtain surface modified core-shell type silicon dioxide coated ammonium phosphate. The particle size of the core-shell type silicon dioxide coated ammonium phosphate prepared by the method disclosed by the invention can be controlled to be 100-800nm, and the core-shell type silicon dioxide coated ammonium phosphate is relatively small in particle size, narrow in distribution and good in dispersity.

Description

Technical field [0001] The invention relates to a method for preparing ammonium phosphate, in particular to a method for preparing core-shell silica-coated ammonium phosphate based on a reverse microemulsion method. Background technique [0002] The preparation methods of ultrafine ammonium phosphate are mainly divided into two categories: physical methods and chemical methods. Commonly used physical methods include pulverization, mechanical alloying, and evaporation and condensation. The first two methods are simple to operate and low in cost, but the product quality is low and the uniformity of particle size is poor. Evaporation and condensation can produce high-quality nanoparticles with controllable particle size, but high technical requirements. Chemical preparation methods can be divided into two types: homogeneous system reaction method and heterogeneous system reaction method. The former includes precipitation method and solvent evaporation method; the latter includes so...

Claims

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Application Information

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IPC IPC(8): C09C1/00C09C3/06C09C3/08C09C3/04C08K9/10C08K3/32
CPCC09C1/00C08K3/32C08K9/10C08K2003/322C09C3/006C09C3/043C09C3/063C09C3/08
Inventor 吴昊然王虹隋明君
Owner 王虹
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