sio with bactericidal function 2 Airgel and its preparation method

An airgel and functional technology, applied in the direction of silica, silicon oxide, etc., can solve the problems of difficult industrial production, cumbersome operation, and long preparation cycle, and achieve the effect of improving stability

Active Publication Date: 2017-11-03
苏州同玄新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since atmospheric drying requires multiple gel channel solvent exchanges and surface hydrophobization treatments, the preparation cycle is long and the operation is cumbersome, it is difficult to achieve industrial production

Method used

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  • sio with bactericidal function <sub>2</sub> Airgel and its preparation method
  • sio with bactericidal function <sub>2</sub> Airgel and its preparation method
  • sio with bactericidal function <sub>2</sub> Airgel and its preparation method

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preparation example Construction

[0048] A kind of SiO with bactericidal function of the present invention 2 The preparation method of airgel comprises the steps:

[0049] (1) Partially hydrolyze orthosilicate to form polysiloxanes with different degrees of polymerization;

[0050] (2) Mix the polysiloxane with the silver nanowire alcohol solution, alcohol, and alkali catalyst evenly, and leave it to stand to form an alcohol gel;

[0051] (3) After crushing the alcohol gel into powder or granular form, mixing and stirring with liquid alkanes or fluoroalkanes to replace the alcohol in the alcohol gels, thereby obtaining alkanes gels;

[0052] (4) mixing and stirring the alkane gel with a mixed solution of a hydrophobic agent and a liquid alkane to obtain a hydrophobic alkane gel;

[0053] (5) Dry the hydrophobic alkane gel under normal pressure to obtain SiO with bactericidal function 2 airgel.

[0054] Further, the molar ratio of orthosilicate to water is preferably 1:0.8˜1:2.0.

[0055] Further, the volu...

Embodiment 1

[0087] (1) Preparation of CS silicone oil: 1 mole of ethyl orthosilicate, 1.3 mole of dilute acid solution (10 -1 mol / L), ethanol (150ml) mixed, refluxed for later use after 8 hours.

[0088] (2) Silver nanowires / SiO 2 Synthesis of composite gel: Take 10 parts of CS silicone oil, 12 parts of ethanol and 1 part of silver nanowire alcohol solution in a stirring tank, drop 100 microliters of ammonia water under stirring, stir at 50 rpm, stir for 5 minutes and let stand to form transparent alcohol gel.

[0089] (3) Solvent replacement and hydrophobization treatment of gel particles: crush the alcohol gel, add 100ml of n-hexane, stir for 4 hours, filter, then put the gel particles in 100ml of n-hexane, and slowly add 8ml of hexamethyl di Silamine, stirred for 2 hours, and filtered to obtain surface hydrophobized modified alkane gel particles.

[0090] (4) Drying of wet gel particles: The surface hydrophobized modified gel particles are dried in a blast dryer, the temperature is co...

Embodiment 2

[0092] (1) Preparation of CS silicone oil: 1 mole of methyl orthosilicate, 1.5 mole of dilute acid solution (concentration 10 -2 mol / L), ethanol (80ml) mixed, refluxed after 16 hours for subsequent use.

[0093] (2) Silver nanowires / SiO 2 Synthesis of composite gel: Take 10 parts of CS silicone oil, 20 parts of ethanol, and 5 parts of silver nanowire alcohol solution, drop 150 microliters of ammonia water under stirring, stir at 800 rpm, stir for 5 minutes, and let it stand to form an opaque alcohol gel glue.

[0094] (3) Solvent replacement and hydrophobization treatment of gel particles: crush the alcohol gel, add 150ml of n-hexane, stir for 4 hours, filter, then put the gel particles in 150ml of n-hexane, and slowly add 10ml of hexamethyl di Silamine, stirred for 2 hours, and filtered to obtain surface hydrophobized modified alkane gel particles.

[0095] (4) Drying of wet gel particles: the surface hydrophobized modified gel particles are dried in a blast dryer, the tem...

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Abstract

The present invention discloses a SiO2 aerogel with a sterilization function and a preparation method therefor. The method comprises: taking orthosilicate as a raw materials to prepare polyethoxydisiloxane with various polymerization degrees as a silicon source; uniformly mixing the silicon source, a silver nanowire alcohol solvent, alcohol and an alkali catalyst; then crushing a wet gel before replacing the same with low surface tension liquid alkoxy or fluoroalkane and modifying the gel with a hydrophobic agent; performing filtration or centrifugation at a normal pressure; and finally drying the gel to obtain various SiO2 aerogel particles with a bactericidal function. According to the present invention, continuous production of the SiO2 aerogel with the bactericidal function is achieved; the production period is short, the production cost is low, and the aerogel dislcosed by the present invention is energy-saving and environmental-friendly. The obtained composite aerogel has a nano porous structure and has restively ideal density, thermal conductivity and specific surface area, and further has the functions of conduction, microorganism prevention, sterilization and air purification while satisfies a heat insulation performance.

Description

technical field [0001] The invention relates to a preparation process of silica airgel, in particular to a method for preparing silica airgel with nanoporous structure and bactericidal function by using normal pressure drying technology, belonging to the technical field of nanoporous materials. Background technique [0002] Airgel is a highly porous nano-material, which is currently the lightest solid material with the best thermal insulation performance in the world. Because silica airgel has high specific surface area (400~1500m2 / g), high porosity (80~99.8%), low density (0.003~0.6g / cm3) and low thermal conductivity (0.013~0.038W / mk ) and other characteristics, making silica aerogels have very broad application prospects in the fields of high temperature resistant heat insulation materials, ultra-low density materials, acoustic impedance coupling materials, gas adsorption and filtration materials, catalyst carrier materials, and drug carrier materials. Usually prepared Si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00C01B33/16
Inventor 张学同王锦何伟娜
Owner 苏州同玄新材料有限公司
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