Preparation method for fiber reinforced silica aerogel oil absorbing sponge

A fiber reinforced, silicon aerogel technology, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problems of poor dispersion and compatibility of reinforcement materials, low elasticity and strength of silicon aerogel sponge, and increased processing costs. , to achieve the effect of promoting the hydrolysis and polycondensation reaction, solving the problem of low mechanical strength and reducing the probability of cracks

Active Publication Date: 2015-11-04
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the following problems exist in the existing technology for preparing fiber-reinforced silicon airgel oil-absorbing sponge: (1) the reinforcement material needs to undergo complicated pretreatment, which increases the processing cost; (2) the dispersibility of the reinforcement material in acidic medium and the Poor compatibility, it is difficult to form polycondensate with silicon precursor; (3) The elasticity and strength of the prepared silicon airgel sponge are relatively low

Method used

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  • Preparation method for fiber reinforced silica aerogel oil absorbing sponge
  • Preparation method for fiber reinforced silica aerogel oil absorbing sponge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0027] 1) Hydrolysis reaction of cellulose reinforced phase

[0028] The microcrystalline cellulose is ground in a mortar, then passed through a 100-mesh sieve, and the under-sieve is taken. Take 0.04g of microcrystalline cellulose after grinding and add it into 50mL oxalic acid solution in which 2.7g of dodecyltrimethylammonium bromide is dissolved, stir vigorously for 10min, carry out ultrasonic solubilization for 10min, then continue stirring for 10min and then again Ultrasonic solubilization was performed for 10 min, and this operation was repeated 3 times.

[0029] 2) Hydrolysis reaction of silicon precursor

[0030] While stirring, add 10 mL of methyltrimethoxysilane, 6.33 mL of dimethyldimethoxysilane, and 1 mL of trimethylmethoxysilane to the hydrolyzate prepared in 1) above, and stir at room temperature for 1 h.

[0031] 3) Polycondensation reaction between cellulose reinforced phase and silicon precursor

[0032] 16.7g of urea was added to the sol solution prepare...

Embodiment example 2

[0036] 1) Hydrolysis reaction of cellulose reinforced phase

[0037]Put microcrystalline cellulose and methyl cellulose into a mortar and grind, then pass through a 100-mesh sieve, and take the under-sieve. Add 0.08g of microcrystalline cellulose and 0.24g of methyl cellulose after grinding to 100mL acetic acid solution dissolved with 6.4g of hexadecyltrimethylammonium bromide, stir vigorously for 15min and then ultrasonically induce dissolution for 15min , and then continue to stir for 15 minutes and then sonicate for another 15 minutes, and repeat this operation 3 times.

[0038] 2) Hydrolysis reaction of silicon precursor

[0039] While stirring, add 20 mL of methyltriethoxysilane, 12.66 mL of dimethyldiethoxysilane, and 2 mL of trimethylethoxysilane to the hydrolyzate prepared in 1) above, and stir at room temperature for 2 h.

[0040] 3) Polycondensation reaction between cellulose reinforced phase and silicon precursor

[0041] Add 33.4 g of urea to the sol solution pr...

Embodiment example 3

[0045] 1) Hydrolysis reaction of cellulose reinforced phase

[0046] Put microcrystalline cellulose and propyl cellulose into a mortar and grind, then pass through a 150-mesh sieve, and take the under-sieve. Take 0.04g of microcrystalline cellulose and 0.08g of propyl cellulose after grinding and add them to 50mL formic acid solution dissolved with 2.7g of dodecyltrimethylammonium chloride, stir vigorously for 20min and then ultrasonically induce dissolution for 20min , and then continue to stir for 20 minutes and then sonicate for another 20 minutes, and repeat this operation 2 times.

[0047] 2) Hydrolysis reaction of silicon precursor

[0048] While stirring, add 10 mL of methyltrimethoxysilane, 6.33 mL of dimethyldimethoxysilane, and 1 mL of trimethylmethoxysilane to the hydrolyzate prepared in 1) above, and stir at room temperature for 1 h.

[0049] 3) Polycondensation reaction between cellulose reinforced phase and silicon precursor

[0050] 5 mL of formamide with a m...

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Abstract

The invention relates to a preparation method for fiber reinforced silica aerogel oil absorbing sponge. The material is applied to oil and water separation, belonging to the technical field of environment, A specific process of the method comprises the following steps: hydrolyzing a cellulose reinforced phase in an acidic catalytic liquid added with a dispersant to obtain a cellulose hydrolysate; then carrying out heating reaction on a silicon precusor and the cellulose hydrolysate under the action of an alkaline catalyst to obtain a fiber reinforced silica wet gel; and mechanically squeezing and drying the fiber reinforced silica wet gel at normal pressure and normal temperature to obtain the fiber reinforced silica aerogel oil absorbing sponge. According to the preparation method provided by the invention, the original Si-O bond in the silica aerogel and the aldehyde acetal group C=O in the cellulose reinforced phase are combined in form of a covalent bond, so that the prepared fiber reinforced silica aerogel oil absorbing sponge not only has excellent oil absorbing performance and oil retaining ability, and moreover, the mechanical strength of the material is improved and the application field of the material is expanded. Moreover, the raw materials of the preparation method are wide in source and low in cost, and the technical route is simple.

Description

technical field [0001] The invention relates to a high-strength reusable oil-absorbing sponge material and a preparation method thereof, in particular to a fiber-reinforced silicon airgel oil-absorbing sponge with cellulose as a space network structure reinforcing phase and methyl as a hydrophobic group and its preparation method. Preparation. It belongs to the field of environmental technology. Background technique [0002] Silica airgel is a new type of nanoporous material with controllable structure, low refractive index and thermal conductivity, high acoustic impedance, and excellent adsorption performance. Although it has high porosity (>90%), low density (<0.3g / cm 3 ) and high specific surface area (about 1600m 2 / g) and other characteristics, and the adsorption capacity of organic oil pollutants can be greatly improved through further surface chemical group modification, but there are still few research reports on its use for adsorption of soluble petroleum p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
Inventor 王辉刘碧涛卞兆勇丁爱中
Owner BEIJING FORESTRY UNIVERSITY
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