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Water-retaining chitosan bacteriostatic antibiotic fertilizer and preparation method thereof

A chitosan, water-retaining technology, applied in fertilizer mixtures, layered/coated fertilizers, fertilization devices, etc., can solve the problems of inability to promote and long-term application of bacteriostatic agents, difficult residues to degrade, and large soil impact. , to achieve the effect of easy promotion and long-term application, widely adjustable release cycle, and high gel strength

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

AI Technical Summary

Problems solved by technology

However, salicylaldehyde is a toxic and dangerous substance, which is harmful to the environment. Long-term use has a greater impact on the soil, and the residue is not easy to degrade. This determines that the bacteriostatic agent cannot be widely promoted and used for a long time.

Method used

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  • Water-retaining chitosan bacteriostatic antibiotic fertilizer and preparation method thereof
  • Water-retaining chitosan bacteriostatic antibiotic fertilizer and preparation method thereof
  • Water-retaining chitosan bacteriostatic antibiotic fertilizer and preparation method thereof

Examples

Experimental program
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Effect test

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 80°C, the PVA solution and a certain amount of mixed solution of crosslinking agent and initiator were added, and reacted at 75°C for 5 hours to obtain a PEG / PVA / PAA reaction solution. Put the chitosan granules with a particle size of 20 mesh into the coating machine, and spray the PEG / PVA / PAA reaction solution at 20 rpm, wherein the chitosan and the reaction solution are mixed uniformly in a mass ratio of 100:5; Heating and drying until the water content is no more than 5.0%; the bacteriostatic and antibacterial particles of PEG / PVA / PAA composite water-absorbing resin-coated chitosan 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 70°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 chitosan particles with a particle size of 200 mesh into the coating machine, and spray the PEG / PVA / PAA reaction solution at 60 rpm, wherein the chitosan and the reaction solution are mixed uniformly in a mass ratio of 100:40; Heating and drying until the water content is no more than 5.0%; PEG / PVA / PAA composite water-absorbing resin-coated chitosan antibacterial and antibacterial particles can be obtained.

Embodiment 3

[0040] 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 75°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 chitosan particles with a particle size of 50 mesh into the coating machine, spray the PEG / PVA / PAA reaction solution at 40 rpm, wherein the chitosan and the reaction solution are mixed evenly in a mass ratio of 100:10; Heating and drying until the water content is no more than 5.0%; the bacteriostatic and antibacterial particles of PEG / PVA / PAA composite water-absorbing resin-coated chitosan can be obtained.

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Abstract

The invention discloses a water-retaining chitosan bacteriostatic antibiotic 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 chitosan 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 chitosan bacteriostatic antibiotic 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 chitosan antibacterial and antibacterial fertilizer and a preparation method thereof. 【Background technique】 [0002] At present, there have been relevant papers and patent reports on the application of chitosan in agriculture. The traditional application of chitosan in agriculture is mainly to use chitosan as a seed dressing agent to dress seeds together with plant seeds. As a natural alkaline polysaccharide polymer, it has good biodegradability, bioactivity and biocompatibility However, due to its poor solubility in neutral water, the application of chitosan is largely limited. The traditional application in agriculture is mainly to use chitosan as a seed dressing agent to dress seeds together with plant seeds. Although this simple physical mixing can have a temporary antibacterial effect, but because chitosan is exposed to the ...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05G3/00C05G5/37
Inventor 牛育华赵冬冬崔文娟
Owner SHAANXI UNIV OF SCI & TECH
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