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Nano silver capable of being dispersed in hydrophilic system and preparation method thereof

A nano-silver and hydrophilic technology, applied in the field of nano-materials, can solve the problems that have not been mentioned, and achieve the effect of reliable method, simple process and low cost

Inactive Publication Date: 2013-03-06
中科广化(重庆)新材料研究院有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic and foreign scientific research workers have proposed some solutions for the dispersion of nano-silver in the hydrophilic polymer system, 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 dispersed in hydrophilic system and preparation method thereof
  • Nano silver capable of being dispersed in hydrophilic system and preparation method thereof
  • Nano silver capable of being dispersed in hydrophilic system and preparation method thereof

Examples

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Effect test

example 1

[0048] Example 1 Preparation of spherical nano-silver that can be dispersed in a hydrophilic system

[0049] 1. Synthesis of nano-silver modifier:

[0050] Take 4.2g MPEG2000 (methoxy polyethylene glycol 2000), 3.2g DMAP (4-dimethylaminopyridine), 4.2g EDC HCl (-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride salt), 2.1g of thioglycolic acid, put them into a 250ml reaction flask, add 180ml of dichloromethane, place at room temperature, stir at high speed for 2 days, then stop the reaction, take out the sample and wash and purify to remove unreacted thioglycolic acid and catalyst DMAP , EDC hydrochloride. According to the esterification reaction of methoxypolyethylene glycol and thioglycolic acid, the nano-silver modifier of the following structural formula can be obtained:

[0051]

[0052] where Z=50;

[0053] 2. Synthesis of spherical nano silver:

[0054] Dissolve 0.17g of silver nitrate in 20ml of deionized water, take 20ml of hydrazine hydrate aqueous solu...

example 2

[0060] Example 2 Preparation of linear nano-silver that can be dispersed in a hydrophilic system

[0061] 1. Synthesis of nano-silver modifier:

[0062] Under anhydrous and oxygen-free conditions, add 0.21g of mercaptoethanol to 20ml of dichloromethane and 0.3g of triethylamine, add 0.21g of dibromoisobutyryl bromide under stirring at 35°C, and then stir at 0°C for 24 hour, then stop the reaction, add 20ml of water, then extract the product of the reaction with toluene, then wash 4 times with saturated ammonium chloride solution, then dry with anhydrous magnesium sulfate, and then vacuum dry to obtain mercaptoethanol-dibromo Isobutyryl bromide is an ATRP initiator containing a mercapto group.

[0063] Then get 0.125g of purified ATRP initiator and join in 50ml of chloroform, then add 12g of acrylamide and 0.1g of chlorinated ketone, then feed inert gas for deoxygenation, then add 0.12g of deoxygenated bispyridine, Stir and react at 70°C for 24 hours, then wash and centrifuge...

example 3

[0073] Example 3 Preparation of Rod-shaped Nano-Silver Dispersible in Hydrophilic System

[0074] 1. Synthesis of modifiers:

[0075] Take 160ml of vinyl acetate, 150mg of initiator AIBN (azobisisobutyronitrile), 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 Completely replace the oxygen therein, and then heat the water bath to 60°C under the protection of nitrogen and slow stirring to start the polymerization reaction. After 60 min, the water bath was replaced with an ice bath to terminate the reaction to obtain thioacetic acid polyvinyl acetate. Then configure the sodium hydroxide aqueous solution whose mass concentration is 10g / L, mix and stir the prepared thioacetic acid polyvinyl acetate and the prepared alkaline solution according to the volume ratio of 1:1 for 4 hours, and the thioacetic acid polyvinyl acetate Vinyl esters are...

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Abstract

The invention discloses nano silver capable of being dispersed in a hydrophilic system and a preparation method thereof. The preparation method of the nano silver comprises: the nano silver capable of being dispersed in the hydrophilic system is obtained by adding a modifying agent at the later stage of the synthetic process of the nano silver, at the moment, the surface activation of the nano silver is high, and the dispersion performance of the modified nano silver obtained is good, so that the nano silver can be uniformly dispersed in the hydrophilic system and can exist stably. In the invention, the method and the technique are simple, and the cost is low, so that wide application can be achieved. According to the invention, a series of defects of the prior art are overcome.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to nanometer silver that can be dispersed in a hydrophilic system and a preparation method thereof. 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] Most of the silver currently used in the industrial field is micron-level silver powder. Compared with micron-level silver powder, nano-level nano-silver has excellent special effects such as quantum size effect, surface effect, small size effect and macroscopic quantum tunneling effect. Therefore, nano-scale silver powder has good applications in microelectronics, optoelectronics, catalysis, biosensors, data storage, magnetic devices, surface-enhanced Raman s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00
Inventor 胡继文邹海良刘锋李银辉肖定书胡美龙
Owner 中科广化(重庆)新材料研究院有限公司
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