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Polymerized sustained-release compound fertilizer and preparation method thereof

A technology for slow-release compound fertilizers and chemical fertilizers, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of inefficient absorption and utilization, limitation of fertilizer utilization rate, fertilizer loss and volatilization, etc., to prevent loss, reduce application amount, reduce The effect of dosage

Inactive Publication Date: 2014-09-10
福建省龙创农业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] According to the above, the current slow-release coated fertilizers for new fertilizers in my country all use traditional chemical fertilizer raw materials. Although polymers are used for coating, crops cannot absorb and utilize them efficiently in a short period of time. After the coating is dissolved or degraded, the fertilizer nutrients can Released, the loss of fertilizer is still unavoidable, and the utilization rate of fertilizer is limited
The current synergistic fertilizers are all simply mixed and added with polymer synergists. Although the synergists are mixed and added to the fertilizer, the fertilizer itself is not polymerized, so a large amount of fertilizer will still be lost and volatilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of polymerization slow-release compound fertilizer, its composition is as follows:

[0031] 40% urea, 30% starch, 15% humic acid, 10% polyacrylic acid, 2% trace elements, 2% urease inhibitor, 1% plant growth regulator, cross-linking agent N,N-methylenebisacrylamide 0.03%, initiator ammonium persulfate 0.01%.

[0032] Its preparation method steps are as follows:

[0033] (1) Add 30% starch, 15% humic acid, 10% polyacrylic acid, 0.03% cross-linking agent N,N-methylene bisacrylamide, 0.01% initiator ammonium persulfate into the reaction kettle, pass Inject nitrogen, remove the oxygen in the reaction kettle, use microwave radiation for 1~2min, send the material into another reaction kettle, cool to room temperature, and obtain polyacrylic acid-starch-humic acid graft polymer;

[0034] (2), heat and melt 40% urea, add it to the polyacrylic acid-starch-humic acid graft polymer obtained in step (1), set the stirring speed at 100r / min~150r / min, keep at room temperature...

Embodiment 2

[0038] A kind of polymerization slow-release compound fertilizer, its composition is as follows:

[0039] Ammonium nitrate 50%, starch 20%, humic acid 20%, polyacrylic acid 5%, trace elements 2%, nitrification inhibitor 2%, plant growth regulator 1%, crosslinking agent glyoxal 0.05%, initiator sodium sulfite 0.01%.

[0040] Its preparation method steps are as follows:

[0041] (1) Add 20% starch, 20% humic acid, 5% polyacrylic acid, 0.05% cross-linking agent glyoxal, and 0.01% initiator sodium sulfite to the reactor, and nitrogen gas is introduced to remove the oxygen in the reactor. Exclude, utilize microwave radiation 1~2min, send material into another reactor, cool to room temperature, obtain polyacrylic acid-starch-humic acid graft polymer;

[0042] (2), heat and melt 50% ammonium nitrate, add it to the polyacrylic acid-starch-humic acid graft polymer obtained in step (1), set the stirring speed at 100r / min~150r / min, keep at room temperature, After fully reacting for 1~...

Embodiment 3

[0046] A kind of polymerization slow-release compound fertilizer, its composition is as follows:

[0047] Monoammonium phosphate 55%, starch 15%, humic acid 15%, polyacrylic acid 8%, trace elements 4%, nitrification inhibitor 1%, phosphorus accelerator 1%, plant growth regulator 1%, cross-linking agent pentadiene Aldehyde 0.02%, initiator potassium persulfate 0.02%.

[0048] Its preparation method steps are as follows:

[0049] (1) Add 15% starch, 15% humic acid, 8% polyacrylic acid, 0.02% crosslinking agent glutaraldehyde, 0.02% initiator potassium persulfate into the reaction kettle, blow nitrogen into the reaction kettle The oxygen is removed, and the material is sent to another reaction kettle by microwave radiation for 1~2min, and cooled to room temperature to obtain polyacrylic acid-starch-humic acid grafted polymer;

[0050] (2) Heat and melt 55% monoammonium phosphate, add it to the polyacrylic acid-starch-humic acid graft polymer obtained in step (1), set the stirri...

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PUM

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Abstract

The invention belongs to the field of crop fertilizers, and in particular relates to a polymerized sustained-release compound fertilizer and a preparation method thereof. The polymerized sustained-release compound fertilizer is mainly prepared by performing graft modification treatment on a polymer polyacrylic acid with gelatinized starch and humic acid, wherein in the graft modification process, humic acid is inserted into modified molecules; further adding chemical fertilizers and nutrient additives for thermal polymerization, and thus combining with a polyacrylic acid-starch-humic acid graft polymer, thereby preparing the polymerized sustained-release compound fertilizer. By adopting the polymerized sustained-release compound fertilizer disclosed by the invention, great loss of the fertilizer in soil is avoided, the utilization rate of the fertilizer is improved, the use amount of the fertilizer is reduced, the roots of plants are activated, and the absorption on the fertilizer is improved. As the graft polymer of polyacrylic acid and the starch has the water solubility, can be slowly dissolved in a soil solution and can also be degraded, environment pollution is avoided, and great meaning is achieved for improving the crop yield.

Description

technical field [0001] The invention belongs to the field of fertilizers for crops, and more precisely relates to a polymerized slow-release compound fertilizer. Background technique [0002] my country is a country with a large population and agriculture. In order to meet the needs of human life, vigorously developing agriculture is an important measure for our country. Chemical fertilizers play an important role in increasing the yield of food crops. The amount of chemical fertilizers in my country has grown rapidly, and sales account for 20% to 30% of the world's total fertilizer consumption. However, the utilization rate of fertilizers in the current season is very low, and nitrogen fertilizer is only 30% to 35%. %, phosphate fertilizer is about 10%~20%, potash fertilizer is 35%~50%, which is 15%~20% lower than the world average. After chemical fertilizers are applied to the soil, a large amount of them are lost in the soil and the air, causing pollution to the environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 陈庆张芝媛
Owner 福建省龙创农业科技有限公司
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