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Nano silver capable of being scattered in hydrophobic system and preparation method and application thereof

A hydrophobic, nano-silver technology, applied in the field of nano-materials, can solve the problems that have not been mentioned, narrow application range, reduce the conductivity of nano-silver, etc., and achieve the effect of good dispersion and strong chemical bonding ability

Inactive Publication Date: 2011-05-18
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming that the present invention mentions nano-silver dispersing method is: the obtained nano-silver is mainly granular, and its dispersibility is to utilize polyvinylpyrrolidone or polycarboxy group class comb type polymer to the coating of nano-silver to realize, handle like this The nano-silver is basically covered by an insulating polymer, so that the conductivity of the nano-silver is lost.
In this paper, PVA is used as a dispersant, and there are the following problems: (1) After PVA coats nano-silver, although it will improve its dispersion in polymers, it will reduce the conductivity of nano-silver; (2) PVA and nano-silver The bonding force is relatively weak, which will make the surface modifier easy to fall off; (3) the nano-silver prepared by it is mainly nano-silver between 0.3 and 1 μm, and the application range is narrow
At present, scientific researchers at home and abroad have proposed many solutions for the dispersion of nano-silver in hydrophobic polymer systems, but according to the existing domestic and foreign literature and patent reports, it has not been mentioned that it can effectively simultaneously Solve the dispersion problem of nano-silver in polymers with different shapes (such as: spherical, granular, linear, rod, dendritic, hedgehog, cylindrical, etc.)

Method used

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  • Nano silver capable of being scattered in hydrophobic system and preparation method and application thereof
  • Nano silver capable of being scattered in hydrophobic system and preparation method and application thereof
  • Nano silver capable of being scattered in hydrophobic system and preparation method and application thereof

Examples

Experimental program
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Effect test

example 1

[0059] 1. Synthesis of nano-silver modifier:

[0060] Take 4.2g polyoxyethylene 400 fatty acid ester, 2.5g N-tert-butyl-L-serine, 3.2gDMAP, 4.2gEDC HCl, put them into a 250ml reaction flask, add 180ml dichloromethane, and place at room temperature, The reaction was stopped after 2-3 days of high-speed stirring, and the sample was taken out and washed and purified to remove unreacted serine and catalysts DMAP and EDC hydrochloride. Obtain the desired one end containing amino group, the other end contains the nano-silver modification agent of hydrophobic component. The structural formula of the modifier is as follows:

[0061]

[0062] 2. Synthesis of spherical nano silver:

[0063] Dissolve 0.17g of silver nitrate in 20ml of deionized water, put it in a 100ml reaction bottle, stir at a high speed at 25°C, then slowly add 20ml of hydrazine hydrate (purity: 60%) to the aqueous solution of silver nitrate, and the addition ends Then react for about 2-3 hours. The TEM photogr...

example 2

[0078] 1. Synthesis of nano-silver modifier:

[0079] Feed nitrogen into the 500ml three-necked reaction flask, and maintain high-speed mechanical stirring, remove the oxygen in the reaction flask, then dissolve 0.121mol N-tert-butyl-L-serine and 0.109mol triethylamine in 300ml treated anhydrous Tetrahydrofuran, and the solution was added to the above-mentioned three-necked reaction flask, then it was placed under cooling and stirring at -20°C, and 0.198mol of treated anhydrous lauroyl chloride was slowly added, and the reaction was maintained at -20°C for 10 hours, and then reacted at -5°C for 5 hours, and then distilled off the solvent in the system under reduced pressure. Obtain the initial product lauroyl-N-tert-butyl-L-serine, then take 60.2mmol of lauroyl-N-tert-butyl-L-serine and 0.301mol of trifluoroacetic acid, add to 100cm 2 Reaction in dichloromethane at room temperature for about one hour, and then remove the unreacted TFA in the solution system. Then use 4mol·dm...

example 3

[0095] 1. Synthesis of modifiers:

[0096] Take 160ml of styrene, 150mg of initiator AIBN (azobisisobutyronitrile), and 510mg of chain transfer agent thioacetic acid, make a solution and add it to a 250ml single-port reaction flask, and continuously feed nitrogen gas for 1h under ice-water bath conditions to thoroughly Oxygen was replaced therein, and then the water bath was heated to 60° C. under the protection of nitrogen and stirring slowly to start the polymerization reaction. After 60min, change the water bath into an ice bath to terminate the reaction to obtain thioacetoxypolystyrene. The structural formula of the modifier is shown in the figure below, where n=10000:

[0097]

[0098] 2. Synthesis of rod-shaped silver nanoparticles

[0099] Take 5ml of ethylene glycol with water removed, add it to a 25ml single-necked reaction flask, stir at 180°C for about 1 hour, then add 0.5ml of ethylene glycol solution containing sodium sulfide (concentration: 1mM), after 5min,...

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Abstract

The invention discloses nano silver capable of being scattered in a hydrophobic system and a preparation method and the application thereof. The preparation method comprises the steps of: adding modifiers during the later period of preparing conventional nano silver so as to obtain the nano silver capable of being scattered in the hydrophobic system. Because the modifiers are added during the later period of preparing the conventional nano silver, the obtained modified nano silver has high surface activation, good scattering performance, and excellent electric conduction performance. The method has broad range of applications, and can be used for modifying various features of nano silver. The nano silver capable of being scattered in the hydrophobic system has strong washing fastness and still keeps good scattering performance after being washed for several times, the preparation method of the nano silver has simple technology, low cost, and broad application range. The invention overcomes a series of defects of the prior art.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a kind of nanometer silver which can be dispersed in a hydrophobic system and its preparation method and application. Background technique [0002] Due to its unique microstructure, nanoparticles have small size effect, surface effect, quantum size effect and macroscopic quantum tunneling effect, so they will show thermal, optical, electrical, magnetic, catalytic and sensitive effects different from conventional materials. [0003] In the field of conductive metals, silver is not only one of the metal materials with the best conductivity, but also the only metal material whose oxides can also conduct electricity. A very important industrial raw material, it plays a very important role in national production and life. [0004] Most of the silver currently used in the industrial field is micron-level silver powder. Compared with micron-level silver powder, nano-level ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 胡继文邹海良李银辉肖定书胡美龙
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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