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Chitosan coating material with adjustable slow release performance and preparation method thereof

A technology of chitosan coating and slow-release performance, which is applied in layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc. The effect of improving utilization rate, reducing pollution and simple preparation process

Inactive Publication Date: 2015-06-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nowadays, there are many types of organic coating materials used in fertilizer slow-release coatings. Organic coating materials include polymers (polyolefin resin, polyethylene, polystyrene , alkyd resin, etc.), tar, rubber, latex, paraffin, asphalt, oil, etc. These organic materials are difficult to adjust the slow-release performance of fertilizers and cannot be degraded, which will cause pollution to the soil environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Step 1. Modification of chitosan: Disperse 6g of chitosan in toluene solvent, and stir until uniform, add 5g of butyl ketene dimer, 0.06g of sodium hydroxide, heat up the reaction to 70°C, react 4h. The chitosan derivatives were obtained after the reaction was completed and separated and dried.

[0012] Step 2. Dissolve 2g of chitosan derivatives and 0.17g of blocked isocyanate in 100g of 2% dilute acetic acid solution to obtain a slow-release coating solution.

Embodiment 2

[0014] Step 1. Disperse 6g of chitosan in chloroform solvent, and stir until uniform, add 10g of dodecenone dimer, 0.12g of sodium hydroxide, heat up to 90°C, and react for 5h. After the reaction, separate and dry to obtain chitosan derivatives.

[0015] Step 2. Dissolve 2g of chitosan derivatives and 0.15g of blocked isocyanate in 100g of 2% dilute acetic acid solution to obtain a slow-release coating solution.

Embodiment 3

[0017] Step 1. Disperse 6g of chitosan in toluene solvent, and stir until uniform, add 12g of tetradecenone dimer, 0.18g of potassium hydroxide, heat up to 100°C, and react for 6h. The chitosan derivatives were obtained after the reaction was completed and separated and dried.

[0018] Step 2. Dissolve 2g of chitosan derivatives and 0.13g of blocked isocyanate in 100g of 2% dilute acetic acid solution to obtain a slow-release coating solution.

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PUM

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Abstract

The invention discloses a chitosan coating material with adjustable slow release performance and a preparation method thereof. The method comprises the following steps: modifying the chitosan by the alkyl ketene dimers to obtain a hydrophobic chitosan slow release material, reacting the alkyl ketene dimers with active hydroxyl and amino in the chitosan chain and introducing a long-chain hydrophobic gene in the chitosan chain; and mixing a terminated isocyanate cross-linking agent and a modified chitosan derivative to prepare the slow release coating solution. The grafting ratio of the chitosan is different, the hydrophobic ability of the chitosan derivative is different, and the cross-linking degree of the material can be changed according to the dosage of the cross-linking agent, so that the slow release performance of the coating material can be adjusted and the purpose for adapting to different crop growth cycles can be reached.

Description

technical field [0001] The invention belongs to the field of slow-release coatings for fertilizers, and relates to a chitosan coating material with adjustable slow-release performance and a preparation method thereof. Background technique [0002] Nowadays, there are many types of organic coating materials used in fertilizer slow-release coatings. Organic coating materials include polymers (polyolefin resin, polyethylene, polystyrene, alkyd resin, etc.), tar, rubber, latex, paraffin, Asphalt, oil, etc. These organic materials are difficult to adjust the slow-release performance of fertilizers and cannot be degraded, which will cause pollution to the soil environment. [0003] Chitosan has very rich biological sources and is a biodegradable material. It can be widely used in the fields of medicine, surfactant, separation material and the like. Due to the existence of a large number of amino groups and hydroxyl groups on the chitosan chain, the hydrophilic ability is strong,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05G5/37
Inventor 徐卫兵黄暄暄陈凯周正发马海红任凤梅
Owner HEFEI UNIV OF TECH
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