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Surface coating method of ammonium salts

A technology of surface coating and ammonium salt, which is applied in the fields of ammonium salt preparation, special surface, and device for coating liquid on the surface, etc. It can solve the problems of high processing cost and unsuitable implementation, and achieve the effect of uniform surface coating layer.

Inactive Publication Date: 2011-09-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The operating pressure of the coating treatment process is 9-11MPa, obviously the treatment cost is relatively high, and it is not suitable for implementation under industrial conditions

Method used

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  • Surface coating method of ammonium salts
  • Surface coating method of ammonium salts
  • Surface coating method of ammonium salts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] At room temperature, weigh 5g of formaldehyde solution with a content of 49%, add it to a 50ml round bottom flask, add quantitative solid potassium silicate therein, the ratio of potassium silicate to formaldehyde is 2:3 according to the ratio of the amount of substance Calculate (based on the content of potassium oxide therein), stir for 10-20 minutes until all solids are dissolved, and then prepare for emulsification of the coating solution. Add 100g of petroleum ether (boiling point 60-90 degrees) into the emulsifier, then add 0.5g of Span 80 emulsifier, start the stirring of the emulsifier and add the pre-prepared potassium silicate formaldehyde mixed solution evenly within 5 minutes In the organic phase, after the emulsification treatment was continued for 20 minutes, the material was in a translucent state, and the emulsification of the coating liquid was completed. After the emulsification is completed, immediately add 100 g of ammonium perchlorate spherical part...

Embodiment 2-11

[0040] Ammonium perchlorate was coated with the same process as in Example 1, and different dispersion media were used for comparison. The comparison results of treatment conditions and coating effects are shown in the following table.

Embodiment 2-10

[0041] Table 1 embodiment 2-10 main process conditions and results

[0042] Example

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Abstract

The invention relates to a surface coating method of ammonium salts. The method comprises emulsifying a mixture of a disperse medium, an aqueous formaldehyde solution and a silicate solution through a conventional emulsification method to obtain a water in oil type emulsion or a water in oil type microemulsion, adding ammonium salt particles, which need to be coated, into the emulsion or the microemulsion, mixing the ammonium salt particles and the emulsion or the microemulsion at a normal temperature to make a surface of each one of the ammonium salt particles be coated with a uniform and dense coating layer, and treating the resulting products by separating and drying processes to make surfaces of the ammonium salt particles be coated with water-insoluble silica coating layers. Comparedwith other physical coating methods, the method provided by the invention has the characteristics of uniform and dense coating layer, no agglomeration between particles and controllability of a coating thickness, and a moisture rate of a sample coated through the method provided by the invention is far lower than moisture rates of samples coated through other methods.

Description

technical field [0001] The invention belongs to the surface treatment technology of inorganic salts, in particular to the surface coating treatment technology of ammonium salts. Background technique [0002] The surface treatment and coating of ammonium salts has been a technical issue that has been widely concerned by many researchers for a long time. The treatment can control the release rate of active ingredients in the soil and become a slow-release fertilizer. Therefore, it is of great significance to improve the coating treatment effect of the ammonium salt surface. [0003] The research reports on the surface treatment and coating of inorganic salts mainly use physical methods to coat a layer of polymer coating agents on the surface of ammonium salts, but these methods are difficult to avoid the mutual agglomeration of particles and the uniformity of the coating layer. Also difficult to control. Yue Jinwen et al. used acrylonitrile monomer precipitation polymerizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/28B01J2/30
Inventor 蔺向阳潘仁明郑文芳李生有
Owner NANJING UNIV OF SCI & TECH
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