Water-retaining humic acid controlled-release fertilizer and preparation method thereof

A controlled-release fertilizer and humic acid technology, which is applied in organic fertilizers, fertilizer mixtures, layered/coated fertilizers, etc., can solve problems such as damage, easy slipping of coatings, and short release cycles of slow-release fertilizers, achieving a long release cycle. Adjustment, high gel strength, and the effect of meeting environmental protection requirements

Active Publication Date: 2016-08-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method utilizes lignin leftovers from paper mills to realize waste reuse and improve soil water and fertilizer retention performance; however, the formation principle of the slow-release fertilizer coating is to use binders such as bentonite or attapulgite powder, without forming mutual cross-linking Covalent bond, the coating is easily slipped or damaged due to external influences, which determines the release period of the slow-release fertilizer is short

Method used

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  • Water-retaining humic acid controlled-release fertilizer and preparation method thereof
  • Water-retaining humic acid controlled-release fertilizer and preparation method thereof
  • Water-retaining humic acid controlled-release fertilizer and preparation method thereof

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preparation example Construction

[0029] A method for preparing a water-retaining humic acid controlled-release fertilizer of the present invention. First, PEG, PVA, and AA are used under the action of an initiator and a cross-linking agent to prepare a reaction solution of a composite water-absorbing resin, and the humic acid is mixed before the reaction solution stops stirring. Put the granules into the coating machine, spray the reaction solution for preparing the water-absorbing resin while rotating, stir evenly, heat up, and dry until the water content is not more than 5.0%; you can get PEG / PVA / PAA composite water-absorbing resin-coated humic acid Water-retaining controlled-release granules of acid. Polyethylene glycol: polyvinyl alcohol: initiator: crosslinking agent = 100:10:15:1.1:0.3.

[0030] The reaction solution of the composite water-absorbing resin is made of polyethylene glycol (PEG), acrylic acid (AA) and polyvinyl alcohol (PVA) with a neutralization degree of 70-85% as raw materials, and the n...

Embodiment 1

[0036] Firstly, acrylic acid with a neutralization degree of 75% is miscible with a certain amount of water and placed in a 500ml three-necked flask, and the same amount of initiator in the PEG solution is added to the acrylic acid at 50°C and stirred for 15 minutes. When the temperature was raised to 70°C, the PVA solution and a certain amount of cross-linking agent and initiator mixed solution were added, and reacted at 75°C for 5 hours to obtain a PEG / PVA / PAA reaction solution. Put the humic acid particles with a particle size of 20 mesh into the coating machine, and spray the PEG / PVA / PAA reaction solution at 20 rpm, wherein the humic acid and the reaction solution are mixed evenly at a mass ratio of 100:5; Heating up and drying until the water content is no more than 5.0%; the water-retaining and controlled-release particles of humic acid coated with PEG / PVA / PAA composite water-absorbing resin can be obtained.

Embodiment 2

[0038]Firstly, acrylic acid with a neutralization degree of 75% is miscible with a certain amount of water and placed in a 500ml three-necked flask, and the same amount of initiator in the PEG solution is added to the acrylic acid at 50°C and stirred for 15 minutes. When the temperature is raised to 85°C, the PVA solution and a certain amount of mixed solution of cross-linking agent and initiator are added. React at 75°C for 10 h to obtain a PEG / PVA / PAA reaction solution. Put the humic acid granules with a particle size of 200 mesh into the coating machine, and spray the PEG / PVA / PAA reaction solution at 60 rpm, wherein the humic acid and the reaction solution are mixed evenly at a mass ratio of 100:40; Heating up and drying until the water content is no more than 5.0%; the water-retaining and controlled-release particles of humic acid coated with PEG / PVA / PAA composite water-absorbing resin can be obtained.

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Abstract

The invention discloses a water-retaining humic acid controlled-release fertilizer and its preparation method. The preparation method comprises the following steps: firstly preparing a reaction solution of complex water-absorbent resin from PEG, PVA and AA under the action of an initiator and a cross-linking agent; putting humic acid particles into a coating machine before stopping stirring the reaction solution; and spraying the prepared reaction solution of water-absorbent resin while rotating, uniformly stirring, heating up, and drying until water content is not more than 5.0% so as to obtain PEG/PVA/PAA complex water-absorbent resin coated humic acid water-retaining controlled-release particles. The coating in the invention has water-saving, water-retaining and biodegradable properties. Thus, soil structure is improved but not affected; loss of nutrients is prevented; and the coating has a strong effect of absorbing nutritive elements such as K<+>, NH4<+> and NO3<+>, etc. In addition, the coating material is a composite material with a three-dimensional special network structure. The coating material has high jelly strength, is not easy to damage and can prolong controlled-release period.

Description

【Technical field】 [0001] The invention belongs to the field of agricultural fertilizer preparation technology, in particular to a water-retaining humic acid controlled-release fertilizer and a preparation method thereof. 【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. The traditional method of humic acid sustained-release granules is mainly to prepare humic acid and humic acid salts and polymerizable monomers (such as acrylic acid, acrylamide, methylenebisacrylamide, etc.) , the granule has the function of water retention and slow release, but the gel strength and compressive capacity are insufficient, resulting in the granule being easily broken after absorbing water, thus losing the effect of water retention and slow release, and some raw materials are difficult to degrade, which is unfavorable to soil properties after use influence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/80
CPCC05F11/02C05G3/80C05G5/30
Inventor 牛育华赵冬冬李媛
Owner SHAANXI UNIV OF SCI & TECH
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