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Polyorganoalkoxysilane reinforced hybrid silica airgel and preparation method thereof

A technology of organoalkoxysilane and silica airgel, which is applied in the field of polyorganoalkoxysilane-reinforced hybrid silica airgel and its preparation, can solve the problems of increased thermal conductivity, poor mechanical properties, and specific Surface area reduction and other issues, to achieve the effect of low thermal conductivity at room temperature, excellent thermal insulation performance, high specific surface area

Active Publication Date: 2021-06-11
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problems of reduced specific surface area, increased thermal conductivity and poor mechanical properties caused by traditional polymer-enhanced silica aerogels, and to provide a high specific surface area, low thermal conductivity and Polyorganoalkoxysilane reinforced hybrid silica airgel with good mechanical properties and preparation method thereof

Method used

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  • Polyorganoalkoxysilane reinforced hybrid silica airgel and preparation method thereof
  • Polyorganoalkoxysilane reinforced hybrid silica airgel and preparation method thereof
  • Polyorganoalkoxysilane reinforced hybrid silica airgel and preparation method thereof

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Embodiment 1

[0043] This embodiment provides a preparation method of polyorganoalkoxysilane reinforced hybrid silica airgel (the operation process is as follows figure 1 shown), which includes the following steps,

[0044] The first step is to prepare high molecular weight polyvinylmethyldimethoxysilane polymer:

[0045] Use vinylmethyldimethoxysilane and tert-butyl peroxide initiator to synthesize high molecular weight polyvinylmethyldimethoxysilane polymer by hydrothermal method, and the reaction temperature of hydrothermal method is controlled at 120°C , the molar ratio of initiator to vinylmethyldimethoxysilane is controlled at 0.100:1, and the reaction time is controlled at 72 hours to obtain high molecular weight polyvinylmethyldimethoxysilane with a weight average molecular weight of about 8000. thing;

[0046] The second step is to prepare a homogeneous sol:

[0047] 2.1, prepare the silane mixture, fully mix the high molecular weight polyvinylmethyldimethoxysilane polymer and m...

Embodiment 2

[0056] This embodiment provides a method for preparing a polyorganoalkoxysilane-reinforced hybrid silica airgel, which includes the following steps,

[0057] The first step is to prepare high molecular weight polyvinylmethyldimethoxysilane polymer:

[0058] Use vinylmethyldimethoxysilane and tert-butyl peroxide initiator to synthesize high molecular weight polyvinylmethyldimethoxysilane polymer by hydrothermal method, and the reaction temperature of hydrothermal method is controlled at 120°C , the molar ratio of initiator to vinylmethyldimethoxysilane is controlled at 0.125:1, and the reaction time is controlled at 72 hours to obtain high molecular weight polyvinylmethyldimethoxysilane with a weight average molecular weight of about 7000. thing;

[0059] The second step is to prepare a homogeneous sol:

[0060] 2.1, prepare the silane mixture, mix the high molecular weight polyvinylmethyldimethoxysilane polymer and methyltriethoxysilane fully and evenly to obtain the silane ...

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Abstract

The invention discloses a polyorganoalkoxysilane reinforced hybrid silica airgel and a preparation method thereof, and aims to provide a polyorganoalkoxysilane reinforced polyorganoalkoxysilane with high specific surface area, low thermal conductivity and good mechanical properties. Hybrid silica airgel and its preparation method. The airgel of the present invention is a polyorganosiloxane porous material, and its components include a polyvinylpolymethylsiloxane reinforcement and a polymethylsilsesquioxane body. The preparation method comprises four steps of preparing high-molecular-weight polyvinylmethyldimethoxysilane polymer, preparing homogeneous sol, performing gel and gel aging on the sol, and performing solvent replacement and supercritical drying on the aged gel. The airgel prepared by the method of the invention has good mechanical properties, higher specific surface area and lower thermal conductivity, and can greatly promote the application range of the silicon oxide airgel material. The method of the invention is environmentally friendly, non-toxic, cheap and economical.

Description

technical field [0001] The invention relates to the technical field of mechanically reinforced hybrid silica airgel, in particular to a polyorganoalkoxysilane reinforced hybrid silica airgel and a preparation method thereof. Background technique [0002] Silica aerogels are a class of multifunctional materials with high porosity, low density, high specific surface area, low thermal conductivity, and low dielectric constant. Based on these obvious advantages, silica aerogels can be applied to Cherenkov radiation experiments, and can be used as thermal insulation materials for blocking space light and thermal insulation windows, as well as carriers for batteries, catalysts, sensors and adsorbents. In addition, due to the relative advantages of low thermal conductivity and low density, silica airgel is an attractive material for space applications. [0003] However, pure silica aerogels have low strength and high brittleness, making it difficult to achieve large-scale practica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J3/075C08F130/08C08G77/04C08G77/06C08L83/04C08L43/04
CPCC08F130/08C08G77/04C08G77/06C08J3/075C08J9/28C08J2383/04C08J2443/04
Inventor 冯坚王鲁凯冯军宗姜勇刚李良军
Owner NAT UNIV OF DEFENSE TECH
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