Charcoal-base polyaspartic acid slow-release urea as well as preparation method and application thereof

A technology of polyaspartic acid and slow-release urea, which is applied in application, fertilizer mixture, fertilization equipment, etc., can solve the problems that cannot meet the needs of high-quality agricultural product production, aggravate soil acidification, soil compaction, and land non-point source pollution. Achieve the effect of improving soil physical and chemical properties, promoting crop growth, and reducing pollution

Active Publication Date: 2014-05-21
CNSG ANHUI HONG SIFANG FERTILIZER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the utilization rate of chemical fertilizers in my country is only 30-40%, and the rest is fixed or leached by the soil, resulting in waste of resources, and environmental problems such as water pollution or land non-point source pollution.
Moreover, with economic development, partial application of chemical fertilizers will not only fail to meet the needs of high-quality agricultural products, but will intensify soil acidification and soil compaction.

Method used

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  • Charcoal-base polyaspartic acid slow-release urea as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Biochar-based polyaspartic acid slow-release urea and its preparation

[0035] Include the following steps:

[0036] 1. Use agricultural waste branches as biomass raw materials to carbonize at 500°C to form porous biochar, cool and grind through an 80-mesh sieve;

[0037] 2. Add urea and formaldehyde into the flask at a molar ratio of 1:2, adjust the pH to weak alkaline with lye, and react at 45°C for 3 hours to prepare modified urea;

[0038] 3. Add 0.12 parts of L-modified manganese polyaspartate to the solution containing 4 parts of modified urea;

[0039] 4. Soak 100 parts of biochar particles in the above solution for 10 hours, then dry;

[0040] 5. Add 3 parts of starch to 100 parts of water, add 0.3 parts of sodium hypochlorite solution dropwise at 35°C, stir and keep warm for 2 hours to make a coating solution;

[0041] 6. Add 100 parts of dried biochar granules loaded with modified urea and polytetramethylene to the oxidized starch coating solution...

Embodiment 2

[0042] Example 2 Biochar-based polyaspartic acid slow-release urea and its preparation

[0043] Include the following steps:

[0044] 1. Use agricultural waste peanut shells as biomass raw materials to carbonize at 400°C to form porous biochar, which is cooled and ground through a 60-mesh sieve;

[0045] 2. Add urea and formaldehyde into the flask according to the molar ratio of 1:1.5, adjust the pH to weak alkaline with lye, and react at 40°C for 3 hours to prepare modified urea;

[0046] 3. Add 0.03 parts of sodium polyaspartate to the solution containing 10 parts of modified urea;

[0047] 4. Soak 100 parts of biochar particles in the above solution for 8 hours, then dry;

[0048] 5. Add 4 parts of starch to 100 parts of water, add 0.15 parts of sodium hypochlorite solution dropwise at 45°C, and keep stirring for 1 hour to make a coating solution;

[0049] 6. Add 100 parts of dried biochar granules loaded with modified urea and polytetramethylene to the oxidized starch coa...

Embodiment 3

[0050] Example 3 Biochar-based polyaspartic acid slow-release urea and its preparation

[0051] Include the following steps:

[0052] 1. Use agricultural waste straw as biomass raw material to carbonize at 450°C to form porous biochar, which is cooled and ground through an 80-mesh sieve;

[0053] 2. Add urea and formaldehyde into the flask at a molar ratio of 1:1, adjust the pH to weak alkaline with lye, and react at 45°C for 3 hours to prepare modified urea;

[0054] 3. Add 0.06 parts of calcium polyaspartate to the solution containing 8 parts of modified urea;

[0055] 4. Soak 100 parts of biochar particles in the above solution for 3 hours, then dry;

[0056] 5. Add 2.5 parts of starch to 100 parts of water, add 0.05 parts of sodium hypochlorite solution dropwise at 40°C, stir and keep warm for 2 hours to make a coating solution;

[0057] 6. Add 100 parts of dried biochar granules loaded with modified urea and polytetramethylene to the oxidized starch coating solution, g...

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Abstract

The invention provides charcoal-base polyaspartic acid slow-release urea. The preparation method comprises the steps of 1) charring agricultural waste which is taken as a biomass raw material at 400-600 DEG C to obtain porous charcoal particles; 2) carrying out a reaction between urea and formaldehyde to obtain a modified urea solution; 3) adding polyaspartic acid and derivative thereof to the modified urea solution; 4) soaking the charcoal particles in the mixing solution obtained from the step 3) for 3-10 hours, and drying the soaked charcoal particles; 5) implementing a reaction between starch and a sodium hypochlorite solution to obtain an oxidized starch solution which serves as a binder; and 6) adding the dried charcoal particles to the binder, pelleting and drying to obtain the charcoal-base polyaspartic acid slow-release urea. The preparation method disclosed by the invention is low in cost, and can relieve conversion from NH4+-N to NO3--N, inhibit rapid decomposition and loss of the urea, prolong fertilizer efficiency, improve nitrogen use efficiency and relieve non-point source pollution; results of field experiments show that the slow-release urea product disclosed by the invention can effectively increase both production and income, and can achieve a yield-increasing effect under a circumstance of reducing application of fertilizer.

Description

technical field [0001] The invention relates to the field of fertilizer preparation, in particular to a biochar-based polyaspartic acid slow-release urea, its preparation method and application. Background technique [0002] Fertilizer is the grain of crops and an indispensable basic means of production in agricultural production. However, the utilization rate of chemical fertilizers in my country is only 30-40%, and the rest is fixed or leached by the soil, resulting in waste of resources, and environmental problems such as water pollution or land non-point source pollution. Moreover, with economic development, partial application of chemical fertilizers will not only fail to meet the needs of high-quality agricultural products, but will intensify soil acidification and soil compaction. However, chemical fertilizers are indispensable for the growth of crops, so the application of slow-release chemical fertilizers has become an effective way to solve this problem. Slow-rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 刘宏斌杨晋辉王洪媛陈艳雪翟丽梅刘申陈秉翼
Owner CNSG ANHUI HONG SIFANG FERTILIZER IND CO LTD
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