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Preparation method of multifunctional organic silicon elastic aerogel

An organic silicon and aerogel technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., to achieve the effects of good elasticity, short production cycle and high strength

Inactive Publication Date: 2018-09-14
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the preparation of silica aerogels in the prior art, and to provide a method for preparing multifunctional organic silicon elastic aerogels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 0.15g of dodecyltrimethylammonium bromide and 1.68g of ethylenediamine in 3.5mL of 8mM aqueous acetic acid solution. After mixing evenly, add 0.62g of isooctyltriethoxysilane and 0.49g of diphenyl Dimethoxysilane, magnetically stirred (400rpm) at 25°C for 1h to obtain organosilicon sol; put the organosilicon sol at 80°C for 36h to obtain organosilane hydrogel, and then hydrogel the organosilane The gel was washed with water and alcohol in sequence, and dried under normal pressure at 60°C to obtain a superhydrophobic silicone elastic airgel sample.

[0029] Various performance measurements were carried out according to the aforementioned method: the water contact angle of the silicone elastic airgel sample was 152.3°, the rolling angle was 2°; the thermal conductivity was 0.039 W m -1 K -1 ; After 600 80% reciprocating compression cycles on the sample, it can still fully return to the original shape, and the compressive strength is still as high as 120KPa, so ...

Embodiment 2

[0031] Dissolve 0.5g of tetradecyltrimethylammonium chloride and 0.01g of sodium hydroxide in 5.7mL of 3.5mM phosphoric acid aqueous solution. After mixing evenly, add 1.48g of aminopropyltrimethoxysilane and 0.5g of dimethoxysilane Methyldiethoxysilane, magnetically stirred for 10min, and then 2mL ferric oxide nanoparticles were added to the above solution, and mechanically stirred at 500rpm at room temperature for 65min to obtain a magnetic organosilicon sol, which was then reacted at 65°C After 48 hours, the magnetic organosilane hydrogel can be obtained, and then washed with water and alcohol, and dried under normal pressure at 60° C., to obtain the magnetic superhydrophobic organosilicon elastic airgel.

[0032] Various performance measurements were carried out according to the aforementioned method: the water contact angle of the silicone elastic airgel sample was 151.9°, the rolling angle was 1°; the thermal conductivity was 0.035 W m -1 K -1 ; Airgel moves with the mov...

Embodiment 3

[0034] Dissolve 4.6mg of didodecyldimethylammonium chloride and 2mg of urea in 8.7mL of 4mM hydrochloric acid aqueous solution. After mixing evenly, add 0.8g of propyltriethoxysilane and 0.5g of methylvinyl di Methoxysilane, after magnetic stirring at 600rpm at 30°C for 1 hour, the organosilicon sol was obtained, and then reacted at 90°C for 30 hours to obtain the organosilicon hydrogel; and then dried under normal pressure at 60°C to obtain the super Elastic silicone elastic airgel. The measurement results show that after 600 80% reciprocating compression cycles, the material can still fully recover to its original shape, indicating excellent elasticity.

[0035] Carry out various performance measurements according to the aforementioned method: the water contact angle of the organic silicon elastic airgel sample is 153.2 °, the rolling angle is 1 °; the thermal conductivity is 0.032W m -1 K -1 . After 600 80% reciprocating compression cycles on the sample, it can still fu...

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Abstract

The invention discloses a preparation method of multifunctional organic silicon elastic aerogel. The preparation method includes the steps: taking tri-functional organic silane and bi-functional organic silane as co-precursors, taking nano-particles as functional factors, and performing normal-temperature hydrolysis to obtain organic silane sol under existing of a trace catalyst and a surface active agent in an aqueous-phase system; performing reaction at a certain temperature to convert the sol into gel, and separating the sol and the gel to obtain organic silane hydrogel; washing the organicsilane hydrogel by water and / or ethyl alcohol, drying the washed organic silane hydrogel in normal pressure to obtain the multifunctional organic silicon elastic aerogel. The prepared organic siliconelastic aerogel has excellent compressive strength, elasticity and stability, further has various functionalities such as super-hydrophobicity, super-amphiphobic performance, low heat conductivity and high electric conduction and is widely applied to the fields such as heat insulation, oil and water separation, lithium batteries and flexible electronic devices. The preparation method of the aerogel is low in cost, high in efficiency, green and environmentally friendly, and mass production of the organic silicon elastic aerogel is facilitated.

Description

technical field [0001] The invention relates to a preparation method of organosilicon airgel, in particular to a green preparation method of multifunctional organosilicon elastic airgel, which belongs to the technical field of composite materials. Background technique [0002] Silica airgel is a three-dimensional porous solid material with a spatial network structure composed of colloidal particles or polymer molecules cross-linked with each other. Its porosity can reach 80-99.9%. At the same time as the glue performance, it also combines the excellent characteristics of the silane coupling agent itself, such as low density, thermal insulation performance, insulation and so on. Therefore, silica aerogels prepared from organosilane coupling agents have received extensive attention. However, the disadvantages of silica airgel, such as fragility and inelasticity, limit the practical application of the material. Therefore, giving it a certain degree of elasticity can effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585C01P2006/32
Inventor 张俊平李凌霄胡涛李步成
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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