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Antibacterial agent used for fertilizer and application thereof

A technology of antibacterial agent and fertilizer, applied in the field of nano-silver antibacterial agent, to achieve the effect of promoting uniform dispersion, large contact area, and maintaining the safety of the food chain

Inactive Publication Date: 2015-12-02
SHENZHEN BATIAN ECOTYPIC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although silver nanoparticles have excellent antibacterial properties, their application as antibacterial materials in biology, medicine, and agriculture has been somewhat limited due to their water insolubility, and they have hardly been involved in fertilizers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]S1 Weigh 0.2 g of the hydrophilic surface modifier polyvinylpyrrolidone (PVP) and dissolve it in 60 mL of distilled water, and then transfer it into a 250 mL three-neck round bottom flask. Under electromagnetic stirring at room temperature, take 50mL of 2.4mmol / L tannic acid solution into the flask, and then add 5mL of 0.5mol / L ammonia water. At this time, the solution is orange-yellow transparent liquid, and the measured pH is about 9.

[0039] S2 Take 30mL of 120mmol / L silver nitrate solution, and slowly add it dropwise to the above-mentioned three-neck flask with a constant pressure dropping funnel, many black fine particles appear in the solution soon, and the solution changes from orange-yellow transparent liquid to red-black suspension. After the silver nitrate solution was added dropwise, stirring was continued for 1 h, and the above solution was concentrated by rotary evaporation.

[0040] S3 Adding an appropriate amount of organic solvent to precipitate the pre...

Embodiment 2

[0043] S1 Weigh 0.3 g of the hydrophilic surface modifier polyethylene glycol (PEG), dissolve it in 50 mL of distilled water, and transfer it into a 250 mL three-neck round bottom flask. Under electromagnetic stirring at room temperature, add 50mL of 2.4mmol / L citric acid solution into the flask, and then add 7mL of 0.5mol / L ammonia water. At this time, the solution is an orange-yellow transparent liquid, making the pH about 9.

[0044] S2 Take 30mL of 120mmol / L silver acetate solution, and slowly add it dropwise to the above-mentioned three-neck flask with a constant pressure dropping funnel, many black fine particles appear in the solution soon, and the solution changes from orange-yellow transparent liquid to red-black suspension. After the silver salt solution was added dropwise, the stirring was continued for 1 h, and the sample solution was concentrated by rotary evaporation.

[0045] S3 Add an appropriate amount of propanol to precipitate the precipitate, filter with s...

Embodiment 3

[0048] S1 Weigh 0.5 g of chitosan and dissolve it in 100 mL of distilled water, and then transfer it into a 500 mL three-neck round bottom flask. Under electromagnetic stirring at room temperature, add 100mL of 2.4mmol / L tartaric acid solution into the flask, and then add 10mL of 0.5mol / L ammonia water. At this time, the solution is orange-yellow transparent liquid, making the pH about 9.

[0049] S2 Take 50mL of 120mmol / L silver nitrate solution, and slowly add it dropwise to the above-mentioned three-neck flask with a constant pressure dropping funnel, many black fine particles appear in the solution soon, and the solution changes from orange-yellow transparent liquid to red-black suspension. After the silver nitrate solution was added dropwise, the stirring was continued for 1.5 h, and the above solution was concentrated by rotary evaporation.

[0050] S3 Add an appropriate amount of ethanol to precipitate the precipitate, filter with suction, wash with the ethanol several...

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Abstract

Provided is an antibacterial agent used for a fertilizer. The antibacterial agent is mainly formed by water-soluble surface modified nano-silver particles which are formed by a hydrophilic surface modifier adhering on the surfaces of the nano-silver particles through a coupled reaction. The percentage of weight of the antibacterial agent in fertilizer is 0.5-2%. The invention also provides a manufacturing method for the antibacterial agent. Through combination of the hydrophilic surface modifier, the reducing agent, ammonium hydroxide, and a silver salt, and through precipitation, suction filtration, and washing by an organic solvent, dark red-brown powder-like water-soluble surface modified nano-silver particles are obtained. The antibacterial agent can be applied in a seed-soaking fertilizer, a water-soluble fertilizer, and a leaf fertilizer. Silver ions are uniformly distributed in the fertilizer, and can easily adhere to soil and crops, so as to maintain nutrient stability of the fertilizer and improve fertilizer utilization rate, and a function of antibiotic is realized, thereby assisting crops to resist diseases and insect pests, reducing use of pesticide, and maintaining safety of a food chain.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a nano-silver antibacterial agent which can be used as a fertilizer additive, preparation of the antibacterial agent and application in fertilizers. Background technique [0002] Silver-based antibacterial agents are well-known broad-spectrum antibacterial agents with many types, simple preparation and safe use. In order to improve the activity and dispersibility of antibacterial agents, silver-based antibacterial agents based on nanopowders have become a research hotspot. The silver-loaded inorganic antibacterial agent has high antibacterial activity and good safety, but the silver ions in this type of material are not stable enough. After being irradiated by ultraviolet rays or heated to a certain temperature, the silver ions are reduced to metallic silver, or converted to silver oxide. Its products are colored, grayed or blackened, thereby affecting the commer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00C05G3/00
Inventor 黄春艳
Owner SHENZHEN BATIAN ECOTYPIC ENG
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