Microcapsule nano silver bactericide preparation method

A nano-silver and fungicide technology, which is applied in the direction of botany equipment and methods, biocide, disinfectant, etc., can solve the problems not mentioned, and achieve the effect of low concentration, stable bactericidal effect, and easy transportation and storage

Inactive Publication Date: 2016-02-03
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art disclosed in the above documents, silver fungicides can only be used in special occasions such as medical hygiene, medicine, disinfection and sterilization, etc., and there are requirements for the use environment, and it is not mentioned that natural water can be used as a medium, and it does not need to be used in the dark. condition

Method used

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  • Microcapsule nano silver bactericide preparation method
  • Microcapsule nano silver bactericide preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Preparation of nano silver fungicide solution

[0021] Dissolve 0.4g chitosan in 100ml water, add 1ml acetic acid, stir to dissolve. 0.14gAgNO 3 Dissolved in 40ml of water, the AgNO 3 The solution was added dropwise into the chitosan solution, and then 10ml of ethanol was added dropwise, and reacted at 80° C. for 6 hours to obtain a golden yellow nano-silver fungicide solution.

[0022] 2) Preparation of microcapsule nano-silver bactericide

[0023] Mix 10g of nano-silver fungicide solution and 3g of formaldehyde evenly and add it to 150ml of n-hexane, slowly add 6.2g of urea and stir it with electric motor for 20min, slowly heat to 40°C and keep it for 30min, then slowly heat to 60°C, add quantitative Styrene-maleic anhydride copolymer, and adjust the pH to 3.0 with dilute hydrochloric acid. After the reaction is finished, centrifuge and dry to obtain a dry powder microcapsule nano-silver fungicide with polythiourea as the wall material.

Embodiment 2

[0025] 1) Preparation of nano-silver bactericide: adopt the nano-silver aqueous solution prepared in Example 1.

[0026] 2) Preparation of microcapsule nano-silver bactericide

[0027] Mix 18g of nano-silver fungicide solution and 3g of formaldehyde evenly and add it into 150ml of n-hexane, slowly add 6.2g of urea and stir it with electric motor for 20min, slowly heat to 40°C and keep it for 30min, then slowly heat to 60°C, add quantitative Styrene-maleic anhydride copolymer, and adjust the pH to 3.0 with dilute hydrochloric acid. After the reaction is finished, centrifuge and dry to obtain a dry powder microcapsule nano-silver fungicide with polythiourea as the wall material.

Embodiment 3

[0029] In aquaculture water, there are a lot of mechanical impurities and soluble impurities. Sterilization and disinfection with silver ions will produce a lot of precipitation, and a large amount of nano-silver will be absorbed by mechanical impurities with general nano-silver; adopt the nano-silver prepared in Example 2 to sterilize The agent neither precipitates nor is adsorbed, and the concentration is extremely low, which is harmless to fish and shrimp in water. Every 1000m 3 The water consumption is 300-500ml, and the concentration is 0.0002-0.0003ppm. Because it does not contain silver ions, it is absolutely safe for fish and shrimp at this concentration. The sterilization and disinfection effects of the nano-silver bactericide of the present invention are very thorough, and after 24 hours of use, the death of fish and shrimp can be prevented. If the water is not changed, the water can maintain a sterile state for a long time. Since silver is harmless to tiny insects...

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Abstract

The present invention discloses a microcapsule nano silver bactericide preparation method comprising two steps: 1) an aqueous solution of chitosan is added with acetic acid and dissolved with stirring to obtain a chitosan acetic acid solution; 0.2-0.5wt% AgNO3 solution is slowly added dropwise into the chitosan acetic acid solution, ethanol is added after the dropping addition is complete, the solution is warmed to 50-70 DEG C for constant temperature reaction for 6-10h to obtain a nano silver bactericide solution; 2) a certain amount of the nano silver bactericide solution is taken and mixed with formaldehyde, then added into to n-hexane, stirred evenly, slowly added with urea, first slowly heated to 35-45 DEG C and maintained for 20-40min, then slowly heated to 55-65 DEG C, and adjusted to pH of 3.0 with an acidic solution, and after the reaction, a dry powdery microcapsule nano silver bactericide is obtained by centrifugation and drying. The microcapsule nano silver bactericide can be efficient in sterilization and high in stability, can be slowly released, and is less limited by the media and environmental.

Description

Technical field: [0001] The invention relates to a microcapsule nano-silver bactericide, a preparation method and application thereof. Background technique: [0002] As a fungicide, silver ions have the characteristics of high efficiency, broad spectrum, safety, and no drug resistance. Nano-silver particles have unique physical and chemical properties, and are widely used in catalysis, optoelectronics, optics, biological sciences, and pharmaceuticals. It is of great significance to study the preparation method of nano silver. At present, nano-silver particles can be prepared by physical (steam-condensation method, ball milling method, sputtering method, discharge explosion method), chemical (liquid phase reaction method, gas phase reaction method, template synthesis method), photocatalysis and biological methods. However, the bactericidal effect of nano-silver fungicides is often limited to soluble impurities in water. For example, Ag+ will interact with soluble impurities ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01N25/28A01P1/00A01N43/16A01N37/02
Inventor 张磊潘月秋
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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