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Controlled-release polymer nitrogen fertilizer and preparation method thereof

A technology of polymers and cross-linked polymers, applied in the direction of nitrogen fertilizer, agricultural gas emission reduction, etc., can solve the problems of unstable fertilizer release, soil compaction, unfavorable crop growth, etc., to achieve easy industrial production and market application, high fertilizer efficiency , the effect of increasing yield and drought resistance

Active Publication Date: 2015-03-04
河南绿盈现代农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the defects that the current slow-release fertilizers have sudden release of fertilizer effect, unstable release of fertilizer effect and cause soil compaction, which is not conducive to the growth of crops, the present invention proposes a slow-release polymer nitrogen fertilizer and a preparation method thereof. In order to achieve the above-mentioned purpose, the present invention will Starch dextrin with different degrees of polymerization is grafted with semicarbazide to obtain semicarbazide polysaccharide, and then a cross-linking agent is added to obtain a new type of slow-release polymer nitrogen fertilizer through cross-linking polymerization. The nitrogen fertilizer has stable fertilizer release and high fertilizer efficiency. , high utilization rate, easy to degrade, and can improve the soil environment

Method used

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  • Controlled-release polymer nitrogen fertilizer and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0027] (1). Add 50 parts by weight of starch dextrin into the reaction kettle, add appropriate amount of distilled water, dissolve at a speed of 100r / min for 5 minutes, and add 45 parts by weight of semicarbazide and 1 part by weight of initiator peroxidation after completely dissolving Lauroyl, keep the rotation speed for 7 minutes, after the semicarbazide is completely dissolved, adjust the pH value of the solution to an alkaline environment of 10 with potassium hydroxide, increase the stirring speed to 200r / min, carry out the esterification reaction at a temperature of 60°C for 2 hours, and form Semicarbazide polysaccharide.

[0028] (2). After the reaction in step (1), 5 parts by weight of sodium borate was added, and a cross-linking reaction was carried out at a temperature of 75° C. for 40 minutes to obtain a cross-linked polymer solution.

[0029] (3). The cross-linked polymer solution obtained in step (2) is dried and then granulated to obtain a slow-release polymer ni...

Embodiment 2

[0031] (1). Add 40 parts by weight of starch dextrin into the reaction kettle, add an appropriate amount of distilled water, dissolve at a speed of 50r / min for 3 minutes, and add 40 parts by weight of semicarbazide and 2 parts by weight of initiator persulfuric acid after completely dissolving Ammonium, keep the speed for 4 minutes, after the semicarbazide is completely dissolved, adjust the pH value of the solution to an alkaline environment of 8 with sodium hydroxide, increase the stirring speed to 150r / min, and carry out the esterification reaction at a temperature of 50°C for 1 hour to generate amino Ureapolysaccharide.

[0032] (2). After the reaction in step (1), 3 parts by weight of potassium borate was added, and a cross-linking reaction was carried out at a temperature of 60° C. for 25 minutes to obtain a cross-linked polymer solution.

[0033] 3. The cross-linked polymer solution obtained in step (2) is dried and then granulated to obtain a slow-release polymer nitro...

Embodiment 3

[0035] (1). Add 45 parts by weight of starch dextrin into the reaction kettle, add an appropriate amount of distilled water, dissolve at a speed of 80r / min for 4 minutes, and add 44 parts by weight of semicarbazide and 3 parts by weight of initiator azo Diisobutyronitrile, keep the rotation speed for 6 minutes, adjust the pH value of the solution to an alkaline environment of 9 with ammonia water after the semicarbazide is completely dissolved, increase the stirring speed to 160r / min, and carry out the esterification reaction at a temperature of 55°C for 1.5h, semicarbazide

[0036] (2). After the reaction in step (1), 4 parts by weight of ammonium borate was added, and a cross-linking reaction was carried out at a temperature of 70° C. for 30 minutes to obtain a cross-linked polymer solution.

[0037] (3). The cross-linked polymer solution obtained in step (2) is dried and then granulated to obtain a slow-release polymer nitrogen fertilizer.

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Abstract

The invention relates to a controlled-release polymer nitrogen fertilizer and a preparation method thereof. The preparation method comprises the specific steps of grafting amylodextrin of different polymerization degrees with semicarbazide to obtain semicarbazide polysaccharide, adding a cross-linking agent, and carrying out cross-linking polymerization, so as to obtain the novel controlled-release polymer nitrogen fertilizer. The controlled-release polymer nitrogen fertilizer has the advantages that the fertilizer efficiency is stably released and high, the use ratio is high, the degradation is easy, and the soil environment can be improved.

Description

technical field [0001] The invention relates to the field of agricultural chemical fertilizers, in particular to a slow-release polymer nitrogen fertilizer and a preparation method thereof. Background technique [0002] As we all know, fertilizer, as an important means of agricultural production, plays a vital role in ensuring the sustainable and stable development of agriculture. Fertilizers usually refer to conventional fertilizers, and the specific types are mainly organic fertilizers (farmyard fertilizers) and chemical fertilizers (inorganic fertilizers). In recent years, with the continuous expansion of the field of plant nutrition and fertilization research and the continuous innovation of new chemical fertilizer production processes, the market demand for fertilizers is undergoing some changes. The development of modern agriculture also has diversified requirements for fertilizers, so the development of new Fertilizer, providing high-efficiency and high-quality fert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C11/00C08B31/00
CPCC05C11/00C08B31/00Y02P60/21
Inventor 陈庆李兴文
Owner 河南绿盈现代农业科技有限公司