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Double-layered coated water-retention slow-released fertilizer capable of releasing negative ions and preparation method of double-layered coated water-retention slow-released fertilizer

A double-coated, slow-release fertilizer technology, applied in the direction of layered/coated fertilizers, potash fertilizers, nitrogen fertilizers, etc., can solve the complex production process of controlled-release materials, large-scale application restrictions, high prices of controlled-release fertilizers, etc. problems, to achieve the effect of improving long-term sustained-release performance, improving water absorption and water retention, reducing volatilization and leaching loss

Inactive Publication Date: 2017-05-24
张明玉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although slow-release and controlled-release fertilizers have good potential economic and social benefits and have been commercialized, their large-scale application in agriculture is still limited, accounting for less than 0.5% of the world's total fertilizer consumption. The production process is complex, resulting in high prices for controlled-release fertilizers

Method used

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Experimental program
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Embodiment Construction

[0024] A double-coated water-retaining slow-release fertilizer capable of releasing negative ions, consisting of the following raw materials in parts by weight: urea 65, ammonium phosphate 25, acrylic acid 33, wheat straw 20, distilled water, potassium hydroxide 5, sodium borohydride 1, Humic acid 14, anhydrous sodium sulfite 9, formaldehyde solution 7, ammonium persulfate 6, N,N'-methylenebisacrylamide 2, sodium alginate 13, 5% calcium chloride aqueous solution, paraffin 3, tourmaline powder 7 , Inorganic clay 3, nano negative ion powder 3, Korean pine polyphenol 2, 10% sodium hydroxide solution in proper amount.

[0025] Specific steps are as follows:

[0026] (1) Straw pretreatment:

[0027] Crush the wheat straw, add distilled water with a mass ratio of 60 times the wheat straw, place the suspension in a water bath at 65°C, filter after 16 hours, add the filtrate to an aqueous solution containing potassium hydroxide and sodium borohydride, Under mechanical stirring for 3...

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Abstract

The invention discloses double-layered coated water-retention slow-released fertilizer capable of releasing negative ions. The double-layered coated water-retention slow-released fertilizer is prepared from the following raw materials in parts by weight: 55 to 70 parts of urea, 20 to 30 parts of ammonium phosphate, 30 to 40 parts of acrylic acid, 14 to 25 parts of wheat straw, a proper amount of distilled water, 2 to 7 parts of potassium hydroxide, 0.5 to 2 parts of sodium borohydride, 12 to 16 parts of humic acid, 5 to 10 parts of anhydrous sodium sulfite, 5 to 10 parts of a formaldehyde solution, 3 to 7 parts of ammonium persulfate, 1 to 3 parts of N,N'-methylene-bisacrylamide, 10 to 16 parts of sodium alginate, a proper amount of a 5 percent calcium chloride water solution, 2 to 4 parts of paraffin wax, 4 to 8 parts of tourmaline powder, 2 to 5 parts of inorganic clay, 2 to 4 parts of nano negative ion powder, 1 to 3 parts of red pine polyphenol and a proper amount of a 10 percent sodium hydroxide solution. According to the double-layered coated water-retention slow-released fertilizer, the humic acid is subjected to modification treatment so that the water solubility is improved; the fertilizer effect of the urea and the utilization rate of nitrogen are improved; the water absorption and water retention properties, and salt resistance of the slow-released fertilizer are improved.

Description

technical field [0001] The invention relates to the technical field of slow-release fertilizers, in particular to a double-layer coated water-retaining slow-release fertilizer capable of releasing negative ions and a preparation method thereof. Background technique [0002] Slow release fertilizer refers to a new type of fertilizer that can slow down or control the release rate of nutrients. Slow-release fertilizers have low solubility in water, and the nutrients are released slowly in the soil, reducing the loss of nutrients; the fertilizer effect is long-term and stable, and the energy can continuously supply the nutrient needs of plants throughout the growth period; suitable for different types of soil and plants , effectively prevent soil compaction. Although slow-release and controlled-release fertilizers have good potential economic and social benefits and have been commercialized, their large-scale application in agriculture is still limited, accounting for less than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G3/00C05G3/04C05G3/80C05G3/90
CPCC05B7/00C05G3/80C05G3/90C05G5/30C05C3/00C05C9/00C05D1/00C05D3/00C05D9/00C05F11/00C05F11/02C05G3/00
Inventor 张明玉
Owner 张明玉
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