Double-layer enveloped slow/controlled release fertilizer and preparation method thereof

A technology of controlled-release fertilizer and double-layer coating, which is applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of reduced grain yield and low utilization rate of natural precipitation, and achieves improved utilization rate, good degradability, and extended irrigation cycle. Effect

Inactive Publication Date: 2015-08-26
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In China, the traditional method of flood irrigation has been adopted for many years, resulting in the effective utilization rate of agricultural water in my country being only a

Method used

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  • Double-layer enveloped slow/controlled release fertilizer and preparation method thereof
  • Double-layer enveloped slow/controlled release fertilizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Preparation of starch-modified polyacrylic acid water-absorbent resin

[0019] Add 40g of cornstarch to the reaction flask, add distilled water, stir and gelatinize in a water bath with a constant temperature of 80°C for 20min, after the gelatinization is complete, lower the temperature of the system to 40°C; add 50g of sodium hydroxide solution with a mass concentration of 20% Neutralized acrylic acid with a neutralization degree of 60%, then add 0.2g of crosslinking agent N, N-methylenebisacrylamide and 0.5g of initiator ammonium persulfate, then raise the temperature of the system to 70°C for constant temperature polymerization for 1.5h, Shred, dry at 70°C, pass through a 100-mesh sieve after crushing to obtain a starch-modified polyacrylic acid water-absorbing resin;

[0020] (2) Preparation of double-layer coated slow / controlled release fertilizer

[0021] Add 60g of urea granules with an average particle size of 2mm into the coating machine, spray rosin e...

Embodiment 2

[0023] (1) Preparation of starch-modified polyacrylic acid water-absorbent resin

[0024] Add 40g of cornstarch to the reaction flask, add distilled water, stir and gelatinize in a water bath with a constant temperature of 80°C for 20min, after the gelatinization is complete, lower the temperature of the system to 40°C; add 50g of sodium hydroxide solution with a mass concentration of 20% Neutralized acrylic acid with a neutralization degree of 60%, then add 0.2g of crosslinking agent N, N-methylenebisacrylamide and 0.5g of initiator ammonium persulfate, then raise the temperature of the system to 70°C for constant temperature polymerization for 1.5h, Shred, dry at 70°C, pass through a 100-mesh sieve after crushing to obtain a starch-modified polyacrylic acid water-absorbing resin;

[0025] (2) Preparation of double-layer coated slow / controlled release fertilizer

[0026] Add 60g of urea particles with an average particle size of 2mm into the coating machine, spray rosin etha...

Embodiment 3

[0028] (1) Preparation of starch-modified polyacrylic acid water-absorbent resin

[0029] Add 40g of cornstarch to the reaction flask, add distilled water, stir and gelatinize in a water bath with a constant temperature of 80°C for 20min, after the gelatinization is complete, lower the temperature of the system to 40°C; add 50g of sodium hydroxide solution with a mass concentration of 20% Neutralized acrylic acid with a neutralization degree of 60%, then add 0.2g of crosslinking agent N, N-methylenebisacrylamide and 0.5g of initiator ammonium persulfate, then raise the temperature of the system to 70°C for constant temperature polymerization for 1.5h, Shred, dry at 70°C, pass through a 100-mesh sieve after crushing to obtain a starch-modified polyacrylic acid water-absorbing resin;

[0030] (2) Preparation of double-layer coated slow / controlled release fertilizer

[0031]Add 50g of urea particles with an average particle size of 2mm into the coating machine, spray rosin ethan...

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Abstract

The invention discloses a double-layer enveloped slow/controlled release fertilizer and a preparation method thereof, belonging to the technical field of slow/controlled release fertilizer for agriculture. The key points of the technical scheme are that the double-layer enveloped slow/controlled release fertilizer is mainly made from the raw materials in parts by weight: 50-60 parts of urea, 20-40 parts of magnesium phosphate, 15-25 parts of starch-modified polyacrylic acid water-absorbent resin and 1-2 parts of rosin ethanol solution with the binder mass concentration of 10%, wherein the inner core of the double-layer enveloped slow/controlled release fertilizer is urea particles, the inner-layer envelope is magnesium phosphate, the outer-layer envelope is starch-modified polyacrylic acid water-absorbent resin. The invention also discloses a preparation method of the double-layer enveloped slow/controlled release fertilizer. As the double-layer envelope is adopted, the inner-layer envelope guarantees the slow-release property of the urea inner core, the outer-layer envelope after absorbing water can be swelled, the soil moisture can be kept while the slow-release property of the fertilizer is further adjusted, the irrigation period is prolonged, and dual-significance is obtained for increasing utilization rate of fertilizers and water in China.

Description

technical field [0001] The invention belongs to the technical field of agricultural slow / controlled release fertilizers, in particular to a double-layer coated slow / controlled release fertilizer and a preparation method thereof. Background technique [0002] Fertilizers are an important guarantee for increasing grain production. In today's world, chemical fertilizers contribute 50% to increasing grain production. China is the country that fertilizes the most in the world, but the fertilizer utilization rate in our country is generally low at present. According to statistics, the seasonal utilization rate of chemical fertilizers is about 30%-35% for nitrogen, about 10%-20% for phosphorus, and about 35%-50% for potassium, among which the loss of nitrogen fertilizer is the most serious. Nutrient loss accelerates lake eutrophication and ecological imbalance, and aggravates environmental pollution. Therefore, it is of great significance to improve fertilizer use efficiency. ...

Claims

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Application Information

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IPC IPC(8): C05G3/00C08F251/00
Inventor 梁蕊岳芳芳张有娟王玉停轩小朋席国喜
Owner HENAN NORMAL UNIV
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