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Preparation method of coated sustained-release fertilizer

A coating slow-release and preparation process technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of starch products being water-resistant, and achieve the effects of green raw materials, good hydrophobicity and mechanical properties, and improved plasticity

Inactive Publication Date: 2014-11-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water, glycerin, etc. are the most common plasticizers for starch, but hydrophilic plasticizers will make starch products not resistant to water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Castor oil and corn starch were mixed at 80°C to obtain castor oil plasticized starch, wherein the ratio of the volume of castor oil to the mass of corn starch was 0.5ml / g. At the same time, castor oil and ethyl lysine diisocyanate were mixed and reacted at 15° C. for 1.5 h to obtain vegetable oil polyurethane prepolymer; wherein the molar ratio of isocyanate group to hydroxyl group was 2.

[0032] 2) Mixing the vegetable oil plasticized starch and the vegetable oil polyurethane prepolymer in water to obtain a modified starch solution; wherein the vegetable oil plasticized starch accounts for 16% by mass of the vegetable oil polyurethane prepolymer.

[0033] 3) wrapping the modified starch solution on the surface of the fertilizer granules and drying to obtain the modified starch-coated slow-release fertilizer. Wherein the modified starch accounts for 5% by mass of the fertilizer granules.

[0034] The test results of infrared spectrum, microscopic analysis and dyna...

Embodiment 2

[0036] 1) Castor oil and corn starch were mixed at 90°C to obtain castor oil plasticized starch, wherein the ratio of the volume of castor oil to the mass of corn starch was 1.0ml / g. At the same time, castor oil and diphenylmethane diisocyanate were mixed and reacted at 25° C. for 1.5 h to obtain vegetable oil polyurethane prepolymer; wherein the molar ratio of isocyanate group to hydroxyl group was 2.75.

[0037] 2) Mixing the vegetable oil plasticized starch and the vegetable oil polyurethane prepolymer in ethanol to obtain a modified starch solution; wherein the vegetable oil plasticized starch accounts for 70% of the vegetable oil polyurethane prepolymer mass percentage .

[0038] 3) Wrap the modified starch solution on the surface of the fertilizer granules by a high-temperature drum method, and dry to obtain the modified starch-coated slow-release fertilizer. Wherein the modified starch accounts for 25% by mass of the fertilizer granules.

[0039] The test results of i...

Embodiment 3

[0041] 1) Cardanol and potato starch were mixed at 85° C. to obtain cardanol plasticized starch, wherein the ratio of the volume of cardanol to the mass of potato starch was 1.5 ml / g. At the same time, cardanol and toluene diisocyanate were mixed and reacted at 25° C. for 2 hours to obtain a vegetable oil polyurethane prepolymer; wherein the molar ratio of isocyanate group to hydroxyl group was 2.25.

[0042] 2) Mix the vegetable oil plasticized starch with the vegetable oil polyurethane prepolymer in a water / ethanol mixed solution to obtain a modified starch solution; wherein the vegetable oil plasticized starch accounts for the mass of the vegetable oil polyurethane prepolymer The percentage is 80%.

[0043] 3) Wrap the modified starch solution on the surface of the fertilizer granules by spraying, and dry to obtain the modified starch-coated slow-release fertilizer. Wherein the modified starch accounts for 95% by mass of the fertilizer granules.

[0044] The test results ...

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PUM

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Abstract

The invention discloses a preparation method of a coated sustained-release fertilizer. The method comprises the following steps: vegetable fat and starch are mixed under a temperature of 80-100 DEG C, such that vegetable fat plasticized starch is obtained; vegetable fat and diisocyanate are mixed by stirring under a temperature of 15-60 DEG C, such that a vegetable fat polyurethane prepolymer is obtained; the vegetable fat plasticized starch and the vegetable fat polyurethane prepolymer are mixed in a solvent, such that a modified starch solution is obtained; the modified starch solution is coated on the surface of fertilizer particles, and is dried, such that a modified starch coated sustained-release fertilizer is obtained. During the preparation process of the vegetable fat polyurethane prepolymer, a molar ratio of isocyanate to hydroxyl is 2-4. The modified starch prepared with vegetable fat is green and environment-friendly. The method has the advantages of simple production process, low production cost, and the like. The method provided by the invention is a novel application of vegetable fat in the fields of modified starch preparation and in sustained-release coating materials.

Description

technical field [0001] The invention relates to the technical field of coated slow-release fertilizers, in particular to a preparation method of modified starch-coated slow-release fertilizers. Background technique [0002] Since the beginning of the 21st century, in order to alleviate the dual pressure of food demand and environmental protection, countries all over the world have devoted themselves to the development of slow / controlled release fertilizers. Production cost, simplification of preparation process, reduction of environmental pollution, and development of natural degradable slow-release fertilizer coating materials have gradually become research hotspots in recent years. Starch is a natural polysaccharide whose yield is second only to cellulose in nature. It mainly comes from corn, potato, wheat, rice, cassava, etc. It has the advantages of low price, wide range of sources, biodegradability, biocompatibility, safety and non-toxicity. However, the mechanical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
Inventor 曾鸣王静李然然刘建新许清强
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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