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Release controlled coated fertilizer and its composition and preparation method

A technology for controlled-release fertilizers and fertilizers, which is applied in fertilizer mixtures, fertilizer forms, and fertilization devices, etc., can solve the problems of high cost, cumbersome process, and excessive film thickness.

Inactive Publication Date: 2005-08-24
方连明 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides one to several kinds of fertilizers which can overcome the above-mentioned defects of excessive film thickness, cumbersome process and high cost, and have good controlled-release effect and can control the release rate of fertilizers and their preparation methods.

Method used

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  • Release controlled coated fertilizer and its composition and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1: monolayer film

[0066] Weigh 36 parts of urea granule fertilizer as the core, weigh 4 parts of sulfur, heat to 150°C, and melt slowly. On the granular urea, a coated urea fertilizer is obtained; after drying, the weight of the coated layer is 10% of the total weight of the coated fertilizer.

Embodiment 2

[0067] Embodiment 2: monolayer film

[0068] Take 60 parts of compound fertilizer as the core, weigh 40 parts of sulfur, heat to 165 ° C, and slowly melt, after all of them are melted into liquid, use compressed air to spray the spray liquid on the granular fertilizer with a sprayer to obtain A layer of coated compound fertilizer; after drying, the weight of the coated layer is 40% of the total weight of the coated fertilizer.

Embodiment 3

[0069] Embodiment 3: monolayer film

[0070] Weigh 28 parts of diammonium phosphate as the core, weigh 7 parts of sulfur, heat to 130°C, and melt slowly. After all of them are melted into liquid, spray the spray liquid on the granular urea with a sprayer using compressed air , to obtain coated urea fertilizer; after drying, the weight of the coated layer is 20% of the total weight of the coated fertilizer.

[0071] Effect: Weigh 100 grams of uncoated common urea in this example and put it into 1000 milliliters of water for dissolution test. At the same time, weigh 100 grams of coated urea prepared in this embodiment of the present invention, put it into 1000 milliliters of water under the same room temperature condition, and measure the urea concentration in water after different time. The results show that the time for the coated urea of ​​the present invention to completely dissolve is 29,000 times longer than that of ordinary urea.

[0072] Field tests show that compared ...

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Abstract

A release-controlled coated fertilizer is composed of fertilizer core and the coated layer which consisting of thermofused sulfur layer, sealing layer made of thermofused polyvinyl wax, and elastic thermofused polyethene layer. Its preparing process is also disclosed.

Description

technical field [0001] The invention relates to a fertilizer capable of controlling the release of fertilizer effect, in particular to a single-layer, two-layer or more-coated controlled-release fertilizer and its combination and preparation method. Background technique [0002] In recent years, many coated or coated fertilizers have been developed, that is, granular fertilizers are coated or coated with organic or inorganic materials to control the slow dissolution of these fertilizers and achieve the effect of improving fertilizer utilization. [0003] For example, one is to use polyolefin resin or polyvinyl dichloride-ethylene copolymer to coat granular fertilizers. The amount of this fertilizer coating is small and it is easier to adjust the dissolution rate. However, these polymer materials are difficult to decompose and may cause environmental pollution. negative effect. SU1784616 discloses a mixture of coated mineral fertilizer granules containing polyvinyl alcohol, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/10C05G5/00
Inventor 方连明
Owner 方连明
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