Preparation method of hydrophobic nano cellulose aerogel

A technology of nanocellulose and airgel, which is applied in the field of preparation of hydrophobic nanocellulose airgel, can solve the problems of long preparation period, complex process and expensive price, and achieve good hydrophobicity, simple equipment and process requirements, The effect of good mechanical properties

Active Publication Date: 2016-06-01
东莞市创进塑胶五金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cellulose aerogels often use freeze-drying or supercritical drying processes, which have a long preparation cycle, high cost, complicated process, and expensive special equipment

Method used

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  • Preparation method of hydrophobic nano cellulose aerogel
  • Preparation method of hydrophobic nano cellulose aerogel
  • Preparation method of hydrophobic nano cellulose aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Mix 200g of rod-shaped nano-microcrystalline cellulose hydrosol (6% solid content) with 200g of deionized water at room temperature to obtain a diluted hydrosol of nano-microcrystalline cellulose;

[0033] (2) adding 4 g of ammonium zirconium carbonate to the diluted hydrosol obtained in step (1) to obtain a mixed solution;

[0034] (3) Mix 40g of dimethyldiethoxysilane and 800g of n-hexane evenly, add to the mixed solution in step (2), heat and stir at 50°C for reaction, and the reaction time is 2.5h;

[0035] (4) After the reaction, the solution is separated and the water layer is removed to obtain a cellulose wet gel;

[0036] (5) The cellulose wet gel was dried at 100°C for 2 hours to obtain a hydrophobic nano-cellulose airgel.

[0037] figure 1 It is a transmission electron microscope picture of rod-like nanocrystalline cellulose. by attaching figure 2 It can be seen that the prepared hydrophobic nanocellulose airgel has excellent hydrophobic properties, a...

Embodiment 2

[0043] (1) Mix 100g of rod-shaped nano-microcrystalline cellulose hydrosol (8% solid content) with 500g of deionized water at room temperature to obtain a diluted hydrosol of nano-microcrystalline cellulose;

[0044] (2) Add 0.6g of 2D resin to the diluted hydrosol obtained in step (1) to obtain a mixed solution;

[0045] (3) Mix 120g of methyltriethoxysilane and 120g of n-hexane and n-heptane mixed solution evenly, add to the mixed solution of step (2), heat and stir at 30°C for reaction, and the reaction time is 1.5h;

[0046] (4) After the reaction, the solution is separated and the water layer is removed to obtain a cellulose wet gel;

[0047] (5) The cellulose wet gel was dried at 180°C for 1 hour to obtain hydrophobic nanocellulose airgel.

[0048] Test Results:

[0049] Density: 0.05g / cm 3 ;

[0050] Specific surface area: 800m 2 / g;

[0051] Thermal conductivity: 0.022W / mK.

Embodiment 3

[0053] (1) Mix 100g spherical nano-microcrystalline cellulose hydrosol (10% solid content) with 300g deionized water at room temperature to obtain a diluted hydrosol of nano-microcrystalline cellulose;

[0054] (2) Add 12g of ammonium zirconium carbonate to the diluted hydrosol obtained in step (1) to obtain a mixed solution;

[0055] (3) Mix 40g of dimethyldimethoxysilane and 120g of n-heptane evenly, add to the mixed solution in step (2), heat and stir at 70°C for a reaction time of 0.5h;

[0056] (4) After the reaction, the solution is separated and the water layer is removed to obtain a cellulose wet gel;

[0057] (5) The cellulose wet gel was dried at 80°C for 6 hours to obtain a hydrophobic nano-cellulose aerogel.

[0058]Test Results:

[0059] Density: 0.2g / cm 3 ;

[0060] Specific surface area: 600m 2 / g;

[0061] Thermal conductivity: 0.04W / mK.

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Abstract

The invention discloses a preparation method of a hydrophobic nano cellulose aerogel. The method comprises the following steps: sequentially adding a mixture of a crosslinking agent, organosilane compounds and a low-surface-tension solvent in a certain ratio into a nano microcrystalline cellulose hydrosol, heating and stirring to react, removing water, and finally, carrying out normal-pressure drying on the wet gel to obtain the hydrophobic nano cellulose aerogel. The density of the aerogel is 0.01-0.2 g / cm<3>, the specific area is 600-1200 m<2> / g, and the heat-conducting heat-insulation coefficient is 0.013-0.055 W / mk. By adopting the normal-temperature drying technique, the preparation method disclosed by the invention has the advantages of low preparation cost, simple technological requirements for equipment and high operational safety.

Description

technical field [0001] The invention relates to a preparation method of airgel, in particular to a preparation method of hydrophobic nano-cellulose airgel. Background technique [0002] Airgel is a kind of solid material with nanoporous network structure formed by the coalescence of inorganic or organic molecules. It has the characteristics of nano-scale porous structure and high porosity, and is one of the solid materials with the smallest density known so far. Because of its low density, low thermal conductivity, high porosity, and large specific surface area, in practical applications, airgel materials have very broad application prospects, and can be used as heat insulation materials, sound insulation materials, catalyst carriers, adsorption materials, etc. . [0003] Cellulose airgel is a new type of airgel material developed in recent years. Cellulose is a green renewable resource with abundant reserves on the earth. In addition to many advantages of traditional air...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/05C08B15/10
CPCC08B15/05C08B15/10
Inventor 刘云晖彭新斌
Owner 东莞市创进塑胶五金有限公司
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