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Slow release fertilizer coating material, preparation method thereof, slow release fertilizer and preparation method thereof

A technology of coated materials and slow-release fertilizers, applied in fertilizer mixtures, layered/coated fertilizers, nitrogen fertilizers, etc., can solve the problems of surface eutrophication, low fertilizer utilization rate, groundwater pollution, etc., and achieve improved diffusion capacity, Effect of improving compatibility and improving mechanical properties

Inactive Publication Date: 2018-03-27
CHANGSHA QIUDIANBING INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of slow-release fertilizer coating material and preparation method thereof and slow-release fertilizer and preparation method thereof, to solve the one-time mass supply of fertilizer after fertilization, causing the utilization rate of fertilizer to be low, resulting in not only direct economic impact Cause losses, and the lost fertilizers often enter the soil and water bodies, causing surface eutrophication and serious pollution of groundwater, etc.

Method used

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  • Slow release fertilizer coating material, preparation method thereof, slow release fertilizer and preparation method thereof
  • Slow release fertilizer coating material, preparation method thereof, slow release fertilizer and preparation method thereof

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preparation example Construction

[0030] The preparation method of the first coating material comprises: 1) mixing starch with water to prepare a starch paste; 2) adding propylene oxide dropwise to the starch paste in the presence of nitrogen to mix, and then placing it at a temperature of After reacting at 45-55°C for 6-10 hours, let it stand still, take the precipitate and dry it to obtain modified starch; 3) Mix the modified starch, polyvinyl alcohol, polypropylene and cross-linking agent to obtain the first coating material ;

[0031] The preparation method of the second coating material comprises: 1) soaking bentonite in an aqueous solution of sodium salt and filtering, taking the filter residue and drying to obtain modified bentonite; II) mixing shale powder, modified bentonite and urea solution Roasting after mixing to obtain the second coating material.

[0032] The present invention has the following beneficial effects: the present invention drops propylene oxide in the starch, reduces the glass tran...

Embodiment 1

[0046] 1) Stir and mix 100 parts by weight of starch and 120 parts by weight of water at a temperature of 60°C to prepare a starch paste; 2) Add 50 drops / min to 100 parts by weight of starch paste in the presence of nitrogen Add 2 parts by weight of propylene oxide dropwise at a rate of 15°C and stir and mix for 0.5h at 15°C, then place it at 45°C for 6h and let it stand, take the precipitate and dry it to obtain modified starch; 3 ) Mix 100 parts by weight of modified starch, 30 parts by weight of polyvinyl alcohol, 5 parts by weight of polypropylene and 5 parts by weight of maleic anhydride to prepare the first coating material A11;

[0047] I) bentonite is placed in the aqueous solution of sodium carbonate (concentration is 3mol / L) and filters after soaking, gets filter residue to dry, makes modified bentonite; II) with 100 weight parts of shale powder, 30 weight parts of modified bentonites and 5 parts by weight The urea solution in parts by weight (the content of urea is ...

Embodiment 2

[0049] 1) Stir and mix 100 parts by weight of starch and 240 parts by weight of water at a temperature of 80°C to prepare a starch paste; 2) Add 150 drops / min to 100 parts by weight of starch paste in the presence of nitrogen 6 parts by weight of propylene oxide was added dropwise at a rate of 6 weight propylene oxide and stirred and mixed for 1.5 hours at 30°C, then placed at a temperature of 55°C for 10 hours and left to stand, and the precipitate was dried to obtain modified starch; 3 ) Mix 100 parts by weight of modified starch, 60 parts by weight of polyvinyl alcohol, 15 parts by weight of polypropylene and 10 parts by weight of maleic anhydride to prepare the first coating material A21;

[0050] I) bentonite is placed in the aqueous solution of sodium carbonate (concentration is 3mol / L) and filters after soaking, and the filter residue is dried to obtain modified bentonite; II) 100 parts by weight of shale powder, 40 parts by weight of modified bentonite and 20 parts by w...

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Abstract

The invention provides a slow release fertilizer coating material, a preparation method thereof, a slow release fertilizer and a preparation method thereof. The preparation method of the slow releasefertilizer coating material comprises a first coating material preparation method and a second coating material preparation method; the first coating material preparation method comprises the following steps of 1) mixing starch and water to prepare a starch paste; 2) under the condition in presence of nitrogen, dropwise adding propylene epoxide in the starch paste for mixing, putting a mixture inthe condition with a temperature being 45-55 DEG C for reaction for 6-10h, then performing standing, taking precipitates, and drying precipitates to obtain modified starch; and 3) mixing the modifiedstarch, polyvinyl alcohol, polypropylene and a crosslinking agent to prepare a first coating material; and the second coating material preparation method comprises the following steps of I) putting bentonite in an aqueous solution of sodium salt for soaking, filtering soaked bentonite, taking filter residues, and drying the filter residues to prepare modified bentonite; (II) mixing shale powder, the modified bentonite and a urea solution, performing roasting to prepare a second coating material. By adopting the slow release fertilizer coating material, the effects of control in release rate ofa fertilizer and high environmental friendly degree are realized.

Description

technical field [0001] The invention relates to the field of slow-release fertilizers, in particular to a slow-release fertilizer coating material and a preparation method thereof, and a slow-release fertilizer and a preparation method thereof. Background technique [0002] As a large agricultural and populous country, our country needs to use limited arable land to support the huge population's demand for food. As the population continues to increase, the area of ​​arable land cannot increase. Therefore, in order to feed the increasing population with limited arable land and achieve sustainable and efficient development, the innovation and development of fertilizer technology has important strategic significance for the development of agricultural industrialization. In the use of fertilizer, the fertilizer will directly enter the soil after fertilization, providing a large amount of nutrients at one time, while the utilization of the nutrients of the plant itself is a cont...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05C9/00C05G5/30
Inventor 卯志华
Owner CHANGSHA QIUDIANBING INFORMATION TECH CO LTD