Block lignin-silicon dioxide composite aerogel

A composite aerogel and silica technology, applied in aerogel preparation, silicon compound, colloid chemistry, etc., can solve the complex operation, limited application range, poor strength of modified silica aerogel felt, etc. problems, to achieve the effect of simple preparation method, high near-infrared reflectivity, and low thermal conductivity

Active Publication Date: 2021-10-22
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, bulk silica felt is the main body, lignin is used as the reinforcing filler material, and the method is complicated to operate, and the prepared modified silica airgel felt has poor strength and limited application range

Method used

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  • Block lignin-silicon dioxide composite aerogel
  • Block lignin-silicon dioxide composite aerogel
  • Block lignin-silicon dioxide composite aerogel

Examples

Experimental program
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Effect test

preparation example Construction

[0052] Blocky lignin-silicon dioxide composite airgel, the preparation method of which comprises:

[0053] Dissolving lignin, cross-linking agent and catalyst in polyol, and chemically cross-linking to construct lignin pre-crosslinking network to obtain pre-crosslinking lignin liquid;

[0054] Add silica precursor, silane coupling agent and deionized water to the pre-crosslinked lignin liquid to carry out hydrolysis and polycondensation reaction to obtain lignin / silica cogel network;

[0055] Fully contact the lignin / silica cogel network with a neutral or acidic aqueous solution to carry out hydrophobic self-assembly of the lignin network and in-situ mineralization of the silica gel. After the reaction is sufficient, dry and anneal to obtain a block In the lignin-silicon dioxide composite aerogel, the aqueous solution is a solution that cannot or hardly dissolves lignin.

[0056] The polyol is a good solvent for lignin, which can well dissolve or disperse lignin and lignin pr...

Embodiment 1

[0083] Example 1: Preparation of three-dimensional bulk lignin / silica composite airgel (LigSi-1)

[0084] The lignin is enzymatic lignin derived from corncobs (Shandong Longli Biotechnology Co., Ltd.), the cross-linking agent is propylene glycol diglycidyl ether (PGDE), the solvent is 1,4-butanediol, and the catalyst is triethylamine , Methyltrimethoxysilane (MTMS) is selected as the silica precursor, and 3-aminopropyltrimethoxysilane (APTMS) is selected as the silane coupling agent.

[0085] Dissolve 2 g of enzymatic lignin in 11 mL of 1,4-butanediol, then add 3 g of PGDE and 0.1 g of triethylamine, and stir at 60 °C for 1 h to form a pre-crosslinked lignin network. Add 1 g of deionized water to the above solution and stir at room temperature for 1 h, then add 2 g of MTMS and 0.5 g of APTMS in turn, and continue stirring for 20 min to promote the dissolution and hydrolysis of silane in the solution, and then the obtained homogeneous sol Transfer to a polystyrene container, a...

Embodiment 2

[0088] Example 2: Preparation of three-dimensional bulk lignin / silica composite airgel (LigSi-2)

[0089] The lignin is enzymatic lignin derived from corncobs (Shandong Longli Biotechnology Co., Ltd.), the cross-linking agent is propylene glycol diglycidyl ether (PGDE), the solvent is 1,4-butanediol, and the catalyst is triethylamine , Methyltrimethoxysilane (MTMS) is selected as the silica precursor, and 3-aminopropyltrimethoxysilane (APTMS) is selected as the silane coupling agent.

[0090] Dissolve 2 g of enzymatic lignin in 19 mL of 1,4-butanediol, then add 3 g of PGDE and 0.1 g of triethylamine, and stir at 60 °C for 1 h to form a pre-crosslinked lignin network. Add 1.7 g of deionized water to the above solution and stir at room temperature for 1 h, then add 6 g of MTMS and 1.5 g of APTMS in turn, and continue stirring for 20 min to promote the dissolution and hydrolysis of silane in the solution, and then the obtained homogeneous The sol was transferred to a polystyrene...

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Abstract

The invention discloses a block lignin-silicon dioxide composite aerogel. Lignin, a cross-linking agent and a chemical cross-linking catalyst are dissolved in polyol, a lignin pre-cross-linked network is constructed through chemical cross-linking to obtain a pre-cross-linked lignin liquid, then a silicon dioxide precursor, a silane coupling agent and deionized water are added, a hydrolytic polycondensation reaction is performed to obtain a lignin/silicon dioxide co-gel network, the lignin/silicon dioxide co-gel network is in full contact with an aqueous solution, hydrophobic self-assembly of the lignin network and in-situ mineralization of silicon dioxide gel are carried out, after the reaction is sufficient, and drying and annealing are carried out to obtain the blocky lignin-silicon dioxide composite aerogel. The preparation of the uniform three-dimensional blocky lignin/silicon dioxide composite aerogel is realized for the first time, and the lignin/silicon dioxide composite aerogel is high in porosity, high in strength, hydrophobic, self-cleaning, low in heat conductivity coefficient and high in infrared reflection capability, and can be developed into a novel light heat-insulating, heat-preserving, fireproof and noise-reducing material.

Description

technical field [0001] The invention relates to a novel material, in particular to a bulk lignin-silicon dioxide composite airgel. Background technique [0002] According to statistics, the energy consumed for building buildings and maintaining a pleasant indoor environment accounts for more than 40% of the world's total energy consumption (Apostolopoulou Kalkavora et al., Adv. Mater. 2020, 2001839), while producing a large amount of greenhouse gases ( Jelle, Energ. Buildings, 43(2011), 2549–2563 2011). Thermal insulation materials can significantly reduce heat transfer in residential and commercial buildings, thereby achieving energy savings (Smalyukh, Adv. Mater. 2020, 2001228). At present, most thermal insulation materials are derived from non-renewable petroleum-based raw materials, which will also cause serious environmental problems after being discarded (Zhao et al., Angew. Chem., Int. Ed., 2018, 57, 7580). Therefore, seeking high-performance and renewable thermal i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C08H7/00B01J13/00
CPCC01B33/1585C08H6/00B01J13/0091
Inventor 王清文樊奇欧荣贤郝笑龙刘涛易欣郭垂根孙理超
Owner SOUTH CHINA AGRI UNIV
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