Method of preparing nano-silver water solution

A technology of aqueous solution and nano-silver, which is applied in the field of nano-materials to achieve the effect of small particle size, simple preparation method and good stability

Inactive Publication Date: 2010-08-25
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the process of preparing nano-silver aqueous solution, the following problems generally exist at present: (1) a suitable dispersant must be selected to disperse nano-silver to prevent the agglomeration of nano-silver; (2) it is often necessary to select a suitable reducing agent to make silver ions (3) When applied to the preparation of nano-silver functional materials, it is also necessary to select a suitable adhesive to fix the nano-silver on the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Place 52ml of polyamino compound divinyltriamine in a 250ml three-necked flask, cool in an ice-water bath, and place in N 2 Under protection, use a constant pressure funnel to slowly add a mixed solution of 43ml methyl acrylate and 100ml methanol dropwise, and react at room temperature for 4 hours after the dropwise addition to obtain light yellow transparent AB 2 and AB 3 type monomer. Then it was transferred to a rotary evaporator eggplant-shaped flask, methanol was removed under reduced pressure, the temperature was raised to 150°C to continue the reduced-pressure reaction for 4 hours, and the reaction was stopped to obtain a viscous light yellow amino-terminated hyperbranched compound.

[0020] Mix 50ml of the above-mentioned amino-terminated hyperbranched compound aqueous solution with a mass percentage of 0.4% and 10ml of a silver nitrate solution with a mass molar concentration of 0.05mol / L, and stir at 50°C for 40min to obtain a nano-silver aqueous solution wit...

Embodiment 2

[0022] Place 52ml of polyamino compound diethylenetriamine in a 250ml three-necked flask, cool in an ice-water bath, and place in N 2 Under protection, use a constant pressure funnel to slowly add 10.8g of succinic anhydride in N,N-dimethylformamide solution, and react at room temperature for 4 hours after the addition, to obtain milky white viscous AB 2 type monomer. Then transfer to a rotary evaporator eggplant-shaped flask, remove N,N-dimethylformamide under reduced pressure, raise the temperature to 150°C to continue the reduced-pressure reaction for 4 hours, stop the reaction, and obtain a viscous light yellow amino-terminated hyperbranched compound.

[0023] Mix 100ml of the above-mentioned amino-terminated hyperbranched compound aqueous solution with a mass percentage of 0.2% and 20ml of a silver nitrate solution with a mass molar concentration of 0.01mol / L, and stir at 50°C for 60min to obtain a nano-silver aqueous solution with a particle size of 5-20nm.

Embodiment 3

[0025] Put 10 g of the amino-terminated hyperbranched compound prepared by diethylenetriamine and methyl acrylate into a three-necked flask, add a certain amount of water to completely dissolve the amino-terminated hyperbranched compound, stir to dissolve, and then dropwise add 12 g of quaternary The aqueous solution of ammonizing reagent glycidyltrimethylammonium chloride (GTMAC) was stirred and reacted at 30°C for 5 minutes to obtain an amino-terminated hyperbranched compound quaternary compound with a degree of amino substitution of about 80%, a number-average molecular weight and a mass-average molecular weight of 5356 and 12223, respectively. ammonium salt solution.

[0026] Mix 100ml of the above-mentioned amino-terminated hyperbranched compound quaternary ammonium salt aqueous solution with a mass percentage of 0.2% and 20ml of a silver nitrate solution with a mass molar concentration of 0.01mol / L, stir at 50°C for 60min, and obtain a nano-silver aqueous solution with a ...

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Abstract

The invention relates to a preparation method of nano-silver solution and belongs to the nanophase material field. The technical scheme is as following: the amino end group overspending compound water solution with the mass percentage of 0.01 percent to 5 percent is mixed with the silver nitrate solution with the mass molality of 0.01 to 0.5 mol / L, the mixture is stirred for 1 to 120 minutes at the temperature of 10 to 100 DEG C to obtain the nano-silver solution with the particle diameter of 1 to 100nm. The method has the advantages of simple technique and high efficiency, the nano-silver solution obtained by the method has the advantages of little impurity, high stability, small particle diameter and uniform dispersion, which can be widely used in the fields of electronic products, spinning, health and medical, food, painting and plastics, etc.

Description

technical field [0001] The invention relates to a method for preparing a nano-silver aqueous solution, which belongs to the field of nano-materials. Background technique [0002] Metal nanomaterials are an important branch of nanomaterials, represented by precious metals gold, silver, and copper, among which nano-silver has received the most attention because of its broad application prospects. Nano-silver can be used in many ways: adding a small amount of nano-silver to chemical fiber can improve certain properties of chemical fiber products and make it have a strong bactericidal ability; doping an appropriate amount of nano-silver in the silicon oxide film can make The glass coated with this film has a certain photoluminescence; good results can be obtained by coating burn wounds and hemorrhoids that have not healed for a long time with nano-silver dressing. Therefore, nano-silver has broad application prospects in the fields of antibacterial materials, high-efficiency ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 张峰陈宇岳吴晓岚
Owner SUZHOU UNIV
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