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Water-retaining slow-release fertilizer and preparation method thereof
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A slow-release fertilizer and fertilizer technology, which is applied in fertilizer mixtures, layered/coated fertilizers, solid/semi-solid fertilizers, etc., can solve the problems of slow degradation, poor strength, and poor slow-release effect of fertilizers, and improve water retention. The effect of improving the connection strength and excellent water retention performance
Active Publication Date: 2022-03-25
LOMON LAND AGRI
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[0010] This application is used to solve the defects of poor strength, slow degradation speed, and poor slow-release effect of fertilizers in the coating materials used in current water-retaining slow-release fertilizers
Method used
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[0040] Second, the invention provides a kind of preparation method of water-retaining slow-release fertilizer, comprises the steps:
[0042] Take the fertilizer granules and place them in a coating machine, add polycaprolactone-polyurethane block copolymer solution, perform coating treatment, dry and cool to obtain the coating;
[0043] (2) The water-retaining layer covers the slow-release layer
[0044] The coated material is placed in a coating machine, subjected to secondary coating treatment, dried and cooled to obtain a water-retaining slow-release fertilizer.
[0045] Among the present invention, in (2), the preparation method of water-retaining layer solution is,
[0046] (i) Halloysite is blended with sulfuric acid solution, and stirred at 85°C for 3 to 7 hours. After the reaction is completed, it is washed with distilled water and dried to obtain activated halloysite;
[0047] (ii) The organic solvent is placed...
Embodiment 1
[0054] A water-retaining slow-release fertilizer, comprising a fertilizer core, a slow-release layer and a water-retaining layer, the innermost layer is a fertilizer core, the inner layer is a slow-release layer, and the outer layer is a water-retaining layer; the fertilizer core is fertilizer granules, and the slow-release layer is polyethylene Lactone-polyurethane block copolymer; the water-retaining layer is cyclodextrin-halloysite-polyacrylonitrile resin.
[0055] Its preparation method is,
[0056] (1) Preparation of sustained-release layer solution:
[0057] Dissolve stannous octoate, polyethylene glycol and ε-caprolactone in toluene to form a raw material solution, pass the raw material solution into argon gas, seal it, react at 150°C for 24 hours, and dissolve it with chloroform after cooling. Precipitate with absolute ethanol, repeat 2-4 times, and dry to obtain the intermediate; dehydrate the polyether polyol and cool down to 40-50°C, add the intermediate and stir q...
Embodiment 2
[0069] The difference between this example and Example 1 is that the molar mass ratio of each component raw material of polycaprolactone-polyurethane block copolymer is different, stannous octoate: polyethylene glycol: ε-caprolactone: polyether multi-component Alcohol: toluene diisocyanate: propylene glycol is 1:7.2:90:85:40:7.
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Abstract
The invention relates to the technical field of fertilizers, and discloses a water-retaining slow-release fertilizer, which includes a fertilizer core, a slow-release layer and a water-retaining layer, the innermost layer is a fertilizer core, the inner layer is a slow-release layer, and the outer layer is a water-retaining layer; the fertilizer core is Fertilizer granules, the slow-release layer is polycaprolactone-polyurethane block copolymer; the water-retaining layer is cyclodextrin-halloysite-polyacrylonitrile resin. Also disclosed is a method for preparing a water-retaining slow-release fertilizer. The fertilizer granules are placed in a coating machine, polycaprolactone-polyurethane block copolymer solution is added, coating treatment is performed, and the coating is obtained by drying and cooling; the coating is placed in In the coating machine, perform secondary coating treatment, dry and cool to obtain water-retaining slow-release fertilizer. The water-retaining and slow-release fertilizer of the present application, by coating the fertilizer core, the first layer of coating forms a slow-release layer, and the second layer of coating forms a water-retaining layer. The slow-release and water-retaining fertilizer of the present application can ensure good slow-release On the basis of speed, it also has excellent water retention performance.
Description
technical field [0001] The invention relates to the technical field of fertilizers, in particular to a water-retaining slow-release fertilizer and a preparation method thereof. Background technique [0002] The current slow-release fertilizers are mainly divided into the following four types, (1) coated type, for example, sulfur coated urea, resin coated urea, compound coated urea, ammonium phosphate potassium salt coated urea, etc.; (2) synthetic type Slightly soluble type, such as urea-formaldehyde, magnesium ammonium phosphate, etc.; (3) chemical inhibitor type, such as stabilized fertilizer, etc.; (4) matrix composite and cemented controlled release type, such as loss-controlling fertilizer, humic acid type fertilizer, etc. [0003] In particular, film-coated fertilizers are one of the mainstream fertilizer types of slow-release fertilizers, which are formed by coating the surface of fertilizer particles with a film. According to different coating materials, coated slow...
Claims
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Application Information
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