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Preparation method of water-retention slow-release fertilizer

A technology for slow-release fertilizers and preparation steps, which is applied in the field of preparation of water-retaining and slow-release fertilizers. It can solve problems such as the difficulty in firmly combining water-retaining agents and fertilizer particles, reducing the water-retaining and slow-release effects of fertilizers, and the slow-release films being damp, so as to increase adsorption and Effects of curing effect, compact structure, and improved slow-release performance

Inactive Publication Date: 2018-04-20
CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main technical problem to be solved by the present invention is that in view of the low fertilizer utilization rate at present, most of the common water-retaining slow-release fertilizers are directly combined with water-retaining agents and fertilizer granules, but it is difficult to firmly combine water-retaining agents and fertilizer granules, and water-retaining materials are easy to transport Or fall off during storage, and the slow-release film is easy to be damp, thereby greatly reducing the defects of the water-retaining and slow-release effect of fertilizers, and providing a preparation method for water-retaining and slow-release fertilizers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Mix phosphorus pentoxide and absolute ethanol at a mass ratio of 1:6, put them into an ultrasonic oscillator, and vibrate and react at an ultrasonic frequency of 30 kHz for 2 hours to obtain a reaction solution, and mix calcium chloride with a mass ratio of 10:1 Mix with the reaction liquid, stir and disperse for 20 minutes to obtain a dispersion liquid; heat the dispersion liquid to 70°C and add dropwise ammonia water with a mass fraction of 30% to the dispersion liquid to adjust the pH of the dispersion liquid to 9.0, and then fill the dispersion liquid after adjusting the pH Put into the high-shear emulsification disperser and disperse and react for 30min. After the reaction, stand and age at 70°C for 12h, filter and separate to obtain a filter cake, and obtain nano-apatite powder after spray-drying; the mass ratio is 5:1: 1:10 weighed black rice leaves, bean curd residues, grape skins and water and mixed them into a tissue grinder for 1 hour to obtain a mixed slurry....

example 2

[0025]Mix phosphorus pentoxide and absolute ethanol at a mass ratio of 1:6, put them into an ultrasonic oscillator, and vibrate and react at an ultrasonic frequency of 35kHz for 2 hours to obtain a reaction solution, and mix calcium chloride with a mass ratio of 10:1 Mix with the reaction liquid, stir and disperse for 25 minutes to obtain a dispersion liquid; heat the dispersion liquid to 75°C and add dropwise ammonia water with a mass fraction of 30% to the dispersion liquid to adjust the pH of the dispersion liquid to 9.3, and then fill the dispersion liquid after adjusting the pH Put into the high-shear emulsification disperser and disperse and react for 35min. After the reaction, stand and age at 75°C for 15h, filter and separate to obtain a filter cake, and obtain nano-apatite powder after spray-drying; the mass ratio is 5:1: 1:10 Weigh the leaves, bean curd residue, grape skin and water and mix them into a tissue grinder for 1 hour to obtain a mixed slurry, put the mixed ...

example 3

[0027] Mix phosphorus pentoxide and absolute ethanol at a mass ratio of 1:6, put them in an ultrasonic oscillator, and vibrate and react at an ultrasonic frequency of 40kHz for 3 hours to obtain a reaction solution, and mix calcium chloride with a mass ratio of 10:1 Mix with the reaction liquid, stir and disperse for 30 minutes to obtain a dispersion liquid; heat the dispersion liquid to 80°C and add dropwise ammonia water with a mass fraction of 30% to the dispersion liquid to adjust the pH of the dispersion liquid to 9.5, and then fill the dispersion liquid after adjusting the pH Put into the high-shear emulsification disperser and disperse and react for 40min. After the reaction, stand and age at 80°C for 18h, filter and separate to obtain a filter cake, and obtain nano-apatite powder after spray-drying; the mass ratio is 5:1: 1:10 Weigh the black rice leaves, bean curd residue, grape skin and water and mix them into a tissue grinder for 2 hours to obtain a mixed slurry, put...

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Abstract

The invention relates to the technical field of fertilizer preparation, specifically to a preparation method of a water-retention slow-release fertilizer. The method comprises: firstly, preparing sea-urchin-like nanometer apatite powder having a high specific surface area; then in the self-crosslinking function of microorganisms, introducing a hydrophilic active group to the surface of nanometer apatite; then, mixing nanometer apatite with fused urea; and crystallizing the mixture and urea via a hydrogen bond association mechanism to form eutectic. In a loose structure of urea, a nanometer base material is filled, so that the loose structure of urea is changed, the structure of urea becomes more compact, and the unordered structure is turned into an ordered structure. Thereby, the thermostability and water stability of urea are improved, the volatility of urea is reduced, and the process that ammonium nitrogen is converted to nitrate nitrogen is delayed. The discharge capacity of nitrous oxide is minimized, and the utilization efficiency of nitrogen is improved. Furthermore, the fertilizer can improve the adsorption and solidification effect of soil on ammonium ions. The adsorptionand solidification amount of ammonium ions is increased, so that the stability of urea is improved. The fertilizer is obviously improved in slow-releasing performance and has bright application prospects.

Description

technical field [0001] The invention relates to the technical field of fertilizer preparation, in particular to a preparation method of water-retaining slow-release fertilizer. Background technique [0002] my country is a large agricultural country, and chemical fertilizers and water resources are the important material basis for the development of modern agriculture. There is an old saying that "there is no harvest depends on water, and more or less depends on fertilizer". However, the nutrient utilization rate of my country's chemical fertilizers is low in the current season, which is far behind other developed countries. The low fertilizer utilization rate not only causes environmental pollution such as water eutrophication and ozone layer destruction, but also wastes a lot of manpower, financial resources and resources. Studies have shown that the application of slow-release urea can effectively improve nitrogen use efficiency, which is in line with the policy of devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G3/04C05G3/80C05G3/90
CPCC05C9/00C05G3/80C05G3/90C05F11/02Y02P60/21
Inventor 龙春牙林茂兰
Owner CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH