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Hydrophobic wastepaper cellulose aerogel composite material and preparation method thereof

A technology of cellulose airgel and composite materials, which is applied in the field of hydrophobic waste paper cellulose airgel composite materials and its preparation, can solve the problems of limitations and lack of hydrophobicity, and achieve good mechanics, low cost, and difficult secondary pollution effect

Inactive Publication Date: 2017-09-05
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent with the publication number CN 103709435 A provides a method for preparing light and high-strength cellulose airgel. The strength of cellulose is improved, but there is no hydrophobicity, so cellulose aerogel is like oil spill in terms of adsorption. The application of adsorption and sewage adsorption treatment is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Firstly, the waste paper is mechanically crushed, and 0.2g of waste newspaper powder is added to a mixed solution of 4g of sodium hydroxide, 7.8g of urea, and 25g of water, stirred at 85°C for 7h, and then 20ml of H 2 o 2 Decolorize, wash until neutral, and treat with a treatment solution of 2ml orthosilicate ethyl ester, 40ml of absolute ethanol, and 35ml of water, so that the waste paper cellulose is dispersed and cross-linked to a certain extent. Take methyltrimethoxysilane, absolute alcohol, H 2 The mass of O is 13.6g, 70g, and 5.4g respectively, then add hydrochloric acid, adjust the pH=1.5, stir for 0.5h, add silanized waste paper fiber, add ammonia water, adjust to pH=10.5, let it stand for 12h, Wait for the gel. The composite gel was immersed in distilled water for 24 hours, frozen at -40°C, vacuum freeze-dried at -50°C, and dried to obtain a hydrophobic waste paper cellulose airgel composite material.

Embodiment 2

[0023] First, mechanically crush the waste paper, take 0.2g of waste paper powder and add it to a mixed solution of 4g of sodium hydroxide, 7.8g of urea, and 25g of water, stir at 85°C for 7 hours, then add 20ml of H2O2 for decolorization, and then wash until neutral. The molar ratio of ethyl silicate, ethanol and water is 2ml of ethyl orthosilicate, 40ml of absolute ethanol, and 40ml of water, so that the waste paper cellulose is dispersed and cross-linked to a certain extent. Take methyltrimethoxysilane, absolute alcohol, H 2 The mass of O is 15g, 500g, and 65g respectively, then add hydrochloric acid, adjust pH = 2, stir for 0.5h, add silanized waste paper fiber, add ammonia water, adjust to pH = 11, let stand for 12h aging time, wait for coagulation glue. The composite gel was immersed in distilled water for 28 hours, frozen at -40°C, vacuum freeze-dried at -60°C, and dried to obtain a hydrophobic waste paper cellulose airgel composite material.

Embodiment 3

[0025] Firstly, the waste paper is mechanically crushed, and 2 g of waste paper powder is added to a mixed solution of 4 g of sodium hydroxide, 7.8 g of urea, and 25 g of water, stirred at 85°C for 7 hours, and then 20 ml of H2O2 is added for decolorization, and then washed until neutral, and the treatment solution is orthosilicon The molar ratio of ethyl acetate, ethanol and water is 2ml of tetraethyl orthosilicate, 50ml of absolute ethanol, and 40ml of water, so that the waste paper cellulose is dispersed and cross-linked to a certain extent. Take methyltrimethoxysilane, absolute alcohol, H 2 The masses of O are 13.6g, 70g, and 5.4g respectively, then add hydrochloric acid, adjust the pH=1.5, stir for 0.5h, add silanized waste paper fiber, add ammonia water, adjust to pH=12, let stand for 10h, Wait for the gel. The composite gel was immersed in distilled water for 28 hours, frozen at -40°C, vacuum freeze-dried at -50°C, and dried to obtain a hydrophobic waste paper cellulos...

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Abstract

The invention discloses a hydrophobic wastepaper cellulose aerogel composite material and a preparation method thereof. The hydrophobic wastepaper cellulose aerogel composite material is formed through combination of wastepaper cellulose and silica aerogel, the content is 2%-10% of the total mass of a sample, the silica aerogel is employed as a substrate, and methyldimethoxysilane, methyltrimethoxysilane or methyltriethoxysilane is taken as another sol precursor. On the basis of the technology of wastepaper cellulose and silica aerogel, two sols are fused, the wastepaper cellulose is uniformly dispersed in the sol system, and after a gel is formed, steps of aging, modification and drying and the like are performed, so that the hydrophobic wastepaper cellulose aerogel composite material is prepared. The hydrophobic wastepaper cellulose aerogel composite material solves the disadvantage that the flexibility is not enough by employing a singular cellulose aerogel, and also solves the disadvantage that the mechanical performance is deficient by employing a singular silicon aerogel, and the prepared cellulose composite aerogel has relatively good mechanical performance and hydrophobic comprehensive performance. The preparation provided by the invention has wide raw material wastepaper sources and low cost and does not easily cause secondary pollution.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a hydrophobic waste paper cellulose airgel composite material and a preparation method thereof. Background technique [0002] Cellulose is a green renewable resource with abundant reserves on the earth. It has abundant and renewable sources, good biocompatibility and degradability. Cellulose airgel is the third-generation airgel material developed in recent years. It has high Porosity, high specific surface area, low density, low thermal conductivity and other excellent properties have been widely used in energy, environmental protection, medicine, aerospace, construction and other fields. The cellulose content in waste book paper and newspapers is high, and fully extracting and utilizing the cellulose in them not only meets the needs of sustainable development and environmental protection, but also effectively reduces the cost of composite materials. [0003] The poor mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
CPCB01J20/103B01J20/24B01J20/28047B01J2220/4812B01J2220/4825B01J2220/46B01J2220/4806
Inventor 赵军郭庆杰周钰寒
Owner QINGDAO UNIV OF SCI & TECH
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