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In-situ preparation method of cellulose-silicon dioxide composite aerogel

A technology of composite airgel and silica, which is applied in the field of in-situ preparation of cellulose-silica composite airgel and the preparation of composite airgel, which can solve the problem of increasing the cost of composite materials, limiting the scope of application, and long-term preparation cycle and other issues, to achieve the effects of saving preparation costs, strong bond force, and a wide range of sources

Inactive Publication Date: 2015-03-25
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica airgel has been developed for nearly a hundred years, and has broad application prospects in aerospace, catalyst carrier, heat insulation and other fields. However, its poor mechanical properties greatly limit its application range.
These methods directly increase the cost of composite materials and require a long preparation cycle

Method used

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  • In-situ preparation method of cellulose-silicon dioxide composite aerogel
  • In-situ preparation method of cellulose-silicon dioxide composite aerogel
  • In-situ preparation method of cellulose-silicon dioxide composite aerogel

Examples

Experimental program
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Effect test

Embodiment 1

[0042] 1. After the cotton linter cellulose is rinsed repeatedly with distilled water and absolute ethanol, and fully dried, the cellulose, NaOH / thiourea / water solution (NaOH mass fraction 9.5%, thiourea mass fraction 4.5%, water mass percentage 83%), after pre-cooling at -15°C for 30 minutes, the cellulose was added to the NaOH / thiourea / water solution so that the mass percentage of the cellulose was 3%. Stir at 750r / min for 10min to obtain a cellulose solution, and then add 7.46ml of TEOS liquid (40TS%). Continue to stir to make the cellulose solution and TEOS solution evenly mixed.

[0043] 2. Sonicate the homogeneous cellulose / TEOS mixed liquid at 25°C for 20 minutes, then freeze at -18°C for 24 hours, place at room temperature, thaw, and age for 3 days. After repeated washing with dilute nitric acid and distilled water, the composite hydrogel was obtained, and freeze-dried to obtain the cellulose-SiO 2 Composite airgel, wherein the freeze-drying temperature is -65°C and ...

Embodiment 2

[0045] 1. Rinse the resinous cellulose with distilled water and absolute ethanol repeatedly and fully dry it, then take the cellulose, NaOH / urea / water solution (7% by mass fraction of NaOH, 12% by mass fraction of thiourea, and 79% by mass of water) , After pre-cooling at -18°C for 20 minutes, add the cellulose to the NaOH / urea / water solution so that the mass percentage of the cellulose is 2%. Stir at 750r / min for 10min to obtain a cellulose solution, and then add 7.46ml of TEOS liquid (40TS%). Continue to stir to make the cellulose solution and TEOS liquid mix evenly.

[0046] 2. Sonicate the homogeneous cellulose / TEOS mixed liquid at 25°C for 20 minutes, then freeze at -18°C for 24 hours, place at room temperature, thaw, and age for 3 days. After repeated washing with dilute nitric acid and distilled water, the composite hydrogel was obtained, and freeze-dried to obtain the cellulose-SiO 2 Composite airgel, wherein the freeze-drying temperature is -65°C and the pressure is...

Embodiment 3

[0048] 1. Rinse the bagasse cellulose with distilled water and absolute ethanol repeatedly, and fully dry it, then take the cellulose and NaOH / water solution (NaOH mass fraction 8%, water mass percentage 90%), and pre-cool at -12°C for 40 minutes Add cellulose to the NaOH / water solution so that the mass percentage of cellulose is 2%. Stir at 750r / min for 10min to obtain a cellulose solution, and then add 3.31ml of TMOS (40TS%) liquid. Then continue to stir, so that the cellulose solution and the TMOS liquid are evenly mixed.

[0049] 2. Sonicate the homogeneous cellulose / TMOS mixed liquid at 25°C for 20 minutes, then freeze it at -18°C for 24 hours, place it at room temperature, thaw it, and age it for 3 days. After repeated washing with dilute nitric acid and distilled water, the composite hydrogel was obtained, and freeze-dried to obtain the cellulose-SiO 2 Composite airgel, wherein the freeze-drying temperature is -65°C and the pressure is 10Pa.

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Abstract

The invention discloses an in-situ preparation method of cellulose-silicon dioxide composite aerogel. The cellulose-SiO2 composite aerogel is prepared from cellulose and organic silicon alkoxide as raw materials and aqueous alkali as a solvent and a catalyst; the porosity of the composite aerogel can be up to 96.6%; and the density is 0.052g / cm<3>. The in-situ preparation method is simple, feasible, energy-saving and environment-friendly; the defects of poor dispersing uniformity, low controllability of composite content, poor stability of a composite phase and the like in the prior art are overcome; the prepared composite aerogel material has relatively low heat-conducting coefficient and good heat-insulating property, and has wide application prospects in the fields of civil industry and medium-low temperature heat protection with special requirements; and a basis is provided for application of the composite aerogel material in the field of heat insulation.

Description

technical field [0001] The invention belongs to the field of natural polymer functional materials, and relates to a method for preparing a composite airgel, in particular to a method for in-situ preparation of a cellulose-silicon dioxide composite airgel. Background technique [0002] Cellulose is the most abundant natural polymer material in nature. It is widely used in textiles, food, construction and other fields. Due to its environmental protection and renewable nature, it has gradually become an important raw material in material synthesis. Silica airgel has been developed for nearly a hundred years, and has broad application prospects in aerospace, catalyst carrier, heat insulation and other fields, but its application range is greatly limited due to its poor mechanical properties. [0003] About Polymer-SiO 2 The research on composite materials has been widely concerned, but most of the polymers used are artificially synthesized non-renewable materials, which bring p...

Claims

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Application Information

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IPC IPC(8): C08L1/02C08K3/36C08J9/28C08J3/075
Inventor 卢凌彬林润俊曹阳李昂何边阳林冲郑婷婷
Owner HAINAN UNIVERSITY
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