Preparation method of degradable sustained-release granules of humic acid

A technology of slow-release granules and humic acid, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problem of short release cycle, and achieve the effect of prolonging the slow-release cycle and improving soil performance.

Active Publication Date: 2013-11-13
XIAN JIBANG NEW AGROCHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method reduces environmental pollution and reduces losses such as volatilization, loss, and decomposition of active substances; however, the formation principle of the controlled-release capsule coating is that sodium alginate and calcium chloride form calcium alginate precipitates, and no covalent bond crosslinking is formed. This determines that the release period of the capsule is relatively short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) First, put the humic acid particles with a particle size of 20-200 mesh into the coating machine, spray the aqueous solution of guanidine collagen powder with a mass concentration of 0.1% at the rotation speed of the coating machine at 20 rpm, and mix evenly; heat up, Dried so that the water content is less than or equal to 5.0%, to obtain dry granules, wherein the mass ratio of humic acid granules and guanidine collagen powder aqueous solution is 100:10;

[0017] 2) Then add the dry granules to 5% borax aqueous solution, soak for 5 minutes, filter, and dry the obtained solid to make the water content less than or equal to 5.0%, to obtain degradable humic acid sustained-release granules.

Embodiment 2

[0019] 1) First put the sodium humate particles with a particle size of 20-200 mesh into the coating machine, spray the hydroxypropyl guar gum aqueous solution with a mass concentration of 0.3% at the rotation speed of the coating machine at 40 rpm, and mix well Heating and drying to make the water content less than or equal to 5.0%, to obtain dry granules, wherein the mass ratio of sodium humate granules to hydroxypropyl guar gum aqueous solution is 100:20;

[0020] 2) Then add the dry granules to 8% boric acid aqueous solution, soak for 10 minutes, filter, and dry the obtained solid to make the water content less than or equal to 5.0%, to obtain degradable humic acid sustained-release granules.

Embodiment 3

[0022] 1) First, put potassium humate granules with a particle size of 20-200 mesh into the coating machine, spray an aqueous solution of guanidine collagen powder with a mass concentration of 0.5% at a rotation speed of 30 rpm, and mix evenly; heat up , drying so that the water content is less than or equal to 5.0%, to obtain dry granules, wherein the mass ratio of potassium humate granules and guanidine collagen powder aqueous solution is 100:5;

[0023] 2) Then add the dried granules into the boron-containing cross-linking agent aqueous solution with a mass concentration of 1%, soak for 20 minutes, filter, and dry the obtained solid to make the water content less than or equal to 5.0%, to obtain degradable humic acid sustained-release granules .

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Abstract

The invention discloses a preparation method of degradable sustained-release granules of humic acid. The method comprises the following steps: firstly, putting humid acid granules into a coating machine; secondly, spraying a water solution of guar gum, with a mass concentration between 0.1 and 1.0%, into the coating machine while rotating the coating machine, evenly mixing the mixture, and heating and drying the mixture to obtain dry granules, wherein the mass ratio of the humic acid to the water solution of guar gum is 100 to between 5 and 30; and finally, adding the dry granules into a Boron cross-linker water solution with a mass concentration between 0.1 and 10.0% for soaking and then filtering, and drying the mixture to obtain the degradable sustained-release granules of humic acid. The coating provided by the invention is degradable, and thus the coating can improve rather than have bad influence on the soil properties. Besides, material of the coating can extend the period of sustained release after being cross-linked with boron compounds. Meanwhile, boron contained in the cross-linker is an essential element of boron-containing fertilizers.

Description

technical field [0001] The invention belongs to the field of agricultural fertilizer preparation, in particular to a preparation method of degradable coated humic acid slow-release granules. Background technique [0002] At present, the preparation methods of humic acid sustained-release granules or sustained-release capsules have been reported in relevant papers and patents. Humic acid sustained-release granules are mainly prepared by polymerizing humic acid and polymerizable monomers (such as acrylic acid, acrylamide, methylenebisacrylamide, etc.) in aqueous solution, drying, and pulverizing. Slow release, water retention, etc., but the polymer introduced by it cannot be degraded, which has an adverse effect on soil properties. Humic acid sustained-release capsules (such as Chinese patent 200810038416.7) are mixed aqueous solution of humic acid, glucose and other mixtures with sodium alginate aqueous solution, and then added to calcium chloride solution to prepare elastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 王晨李小瑞沈一丁牛育华李培枝杨晓武
Owner XIAN JIBANG NEW AGROCHEM IND
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