Two-layer coated water-retaining sustained-release fertilizer and preparation method thereof

A double-coated, slow-release fertilizer technology, applied to fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of high toxicity, loss of fertilizer nutrients, short duration, etc., achieve good water retention and moisture retention, and improve water absorption capacity , the effect of improving the utilization rate

Inactive Publication Date: 2012-04-25
SHANDONG XIFENGTIAN ECOLOGY FERTILIZER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of the above-mentioned controlled-release fertilizers are: some organic solvents used in production, such as benzene, xylene and halogenated hydrocarbons, are highly toxic, and have even been banned at home and abroad.
Due to the relatively concentrated rainfall in m

Method used

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  • Two-layer coated water-retaining sustained-release fertilizer and preparation method thereof
  • Two-layer coated water-retaining sustained-release fertilizer and preparation method thereof
  • Two-layer coated water-retaining sustained-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of double-coated water-retaining slow-release urea fertilizer

[0030] Put 90 parts of urea granules with a diameter of 1-2 mm in a disc granulator (Zhengzhou Ruiheng Machinery Manufacturing Co., Ltd., ZL10), spray atomized water to wet the surface of urea granules, and pass 10 parts through 110 mesh The sieved carrageenan powder is added to the disc granulator for rolling coating, so that it is wrapped on the fertilizer core, because urea and water produce ammonium ions (NH 4 + ), cross-linked carrageenan. Finally, 10 parts of the prepared water-absorbent resin powder (agricultural superabsorbent resin, NIPPO, Nippon Shokubai) were added to the disc for rolling coating, so that the water-absorbent resin powder was wrapped on the outer layer of the fertilizer particles as the outer coating of the fertilizer. Then, it is dried at room temperature to obtain the finished product of double-coated water-retaining slow-release urea fertilizer.

[0031] ...

Embodiment 2

[0045] (1) Preparation of double-layer coated water-retaining slow-release compound fertilizer

[0046] Put 92 parts of nitrogen, phosphorus and potassium compound fertilizer particles (provided by Shandong Xitiantian Ecological Fertilizer Co., Ltd.) with a diameter of 1-2mm in the disc granulator (Zhengzhou Ruiheng Machinery Manufacturing Co., Ltd., ZL10), spray into the mist After the surface of the granule is wetted with water, add 8 parts of carrageenan powder that has passed through a 110 mesh sieve into the disc granulator for rolling coating, so that it is wrapped on the kernel of the fertilizer, and spray 5% KCl aqueous solution on the carrageenan. Carry out cross-linking, consumption is 8% of carrageenan dry weight, cross-linked carrageenan. Finally, 10 parts of the prepared water-absorbent resin powder (agricultural superabsorbent resin, NIPPO, Nippon Shokubai) were added to the disc for rolling coating, so that the water-absorbent resin powder was wrapped on the o...

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Abstract

The invention discloses a two-layer coated water-retaining sustained-release fertilizer and a preparation method thereof. The two-layer coated water-retaining sustained-release fertilizer comprises fertilizer particles and two-layer coatings coating the surfaces of the fertilizer particles; an inner-membrane controlled-release layer is made of carrageenan and soluble potassium salt or soluble ammonium salt; and an outer-membrane water-retaining layer is made of high water absorption resin. The two-layer coated water-retaining sustained-release fertilizer provides various nutrient elements required by plants, and improves the sustained release property of the nutrient elements; meanwhile, through the combination of the fertilizer and the water absorption resin, the two-layer coated water-retaining sustained-release fertilizer has multiple functions of absorbing and retaining water, performing sustained release, conditioning soil and the like.

Description

[0001] technical field [0002] The invention relates to the technical field of slow-release fertilizers, in particular to a water-retaining slow-release fertilizer with a double-layer coating and a preparation method thereof. Background technique [0003] Fertilizers play an important role in agricultural production. The Food and Agriculture Organization of the United Nations concluded that about 55% of the increase in food production in developing countries comes from chemical fertilizers. At present, in the seasonal utilization rate of chemical fertilizers in my country, nitrogen is about 30% to 35%, phosphorus is 10% to 25%, and potassium is 35% to 50%, which are far below the level of developed countries in the world. The main cause of low fertilizer utilization rate is leaching loss, especially nitrogen and potassium fertilizers. People are trying to find ways to improve fertilizer use efficiency, one of which is to modify the fertilizer itself to develop new fertiliz...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/80
Inventor 曹郁
Owner SHANDONG XIFENGTIAN ECOLOGY FERTILIZER IND
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