Aerogel material and preparation method thereof

A technology of airgel and carrageenan, applied in chemical instruments and methods, colloid chemistry, colloid chemistry, etc., can solve problems such as low preparation efficiency, uneven material performance, environment and personnel safety, and achieve high production efficiency and easy Promote and enhance the effect of adhesion

Inactive Publication Date: 2014-02-26
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has obvious disadvantages. For example, the alkaline environment required for crosslinking will promote the degradation of the polymer during use, and the residual toxic crosslinking agent will bring environmental and personnel safety problems. The aqueous solution system used is incompatible, and it is difficult to mix the crosslinking agent and the polymer / clay material evenly under the high viscosity system, resulting in uneven material properties and low production efficiency

Method used

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  • Aerogel material and preparation method thereof

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Effect test

Embodiment 1

[0022] First, 0.8 g of polyvinyl alcohol (Mw 31,000~50,000, alcoholysis degree 99%) was heated and dissolved in 100 mL of deionized water, 15 g of montmorillonite was added, and then stirred at high speed until it became a uniform colloid. For irradiation crosslinking of kGy, the product was snap-frozen at -78 °C (ethanol bath of dry ice) until ice crystal growth was complete, and vacuum lyophilized at room temperature to complete dryness.

Embodiment 2

[0024] First add 1 g of montmorillonite to 100 mL of deionized water, stir at high speed until a uniform suspension, then heat 20 g of polyvinyl alcohol (Mw 31,000~50,000, alcoholysis degree 99%) to dissolve in the above suspension, in Irradiation crosslinking at a total dose of 200 kGy was performed under gamma rays, and the product was snap-frozen at -78 °C (ethanol bath of dry ice) until ice crystal growth was complete, and vacuum lyophilized at room temperature until complete dryness.

Embodiment 3

[0026] First, 10 g of polyvinyl alcohol (Mw 31,000~50,000, alcoholysis degree 99%) was heated and dissolved in 100 mL of deionized water. After adding 5 g of deionized soil, it was stirred at high speed until it became a uniform colloid. The total dose was 100 under gamma rays. For irradiation crosslinking of kGy, the product was snap-frozen at -78 °C (ethanol bath of dry ice) until ice crystal growth was complete, and vacuum lyophilized at room temperature to complete dryness.

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Abstract

The invention provides an aerogel material and a preparation method thereof. The material is prepared from a polymer and clay by the steps of aqueous solution blending, irradiation crosslinking and freeze drying, wherein the polymer accounts for 5-95% of the aerogel weight, the clay accounts for 95-5% of the aerogel weight, and the aerogel density is 0.03-0.20g / cm<3>. The preparation method of the aerogel material provided by the invention sequentially comprises the following steps: (a) dissolving the polymer in deionized water, adding the clay and stirring to obtain turbid liquid in uniform distribution; (b) performing irradiation crosslinking of the turbid liquid obtained by the step (a) under high-energy rays, wherein the irradiation dosage of the high-energy rays is 1-200kGy; and (c) freezing the irradiation product obtained by the step (b), and drying to obtain the aerogel material. Since water is used as a solvent only in the preparation process and a chemical crosslinking agent is not required by the irradiation crosslinking, the crosslinking is efficient and controllable, the crosslinking density is uniform, the preparation process is green and environment-friendly, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of material preparation, in particular to an aerogel material and a preparation method thereof. Background technique [0002] Aerogel, also known as xerogel, is prepared by replacing the liquid in the gel with gas, and the gel network structure remains basically unchanged. Traditional silica aerogel was originally invented by Kistler in 1930. It has very high porosity, high specific surface area, low apparent density and refractive index. It has great application prospects in the fields of energetic materials, catalytic materials, adsorption materials, and Cherenkov threshold detectors. Traditional aerogel preparations use silicon alkoxides as raw materials, and the preparation process is divided into three steps: gelation, aging and drying. Due to the high cost of raw materials, complicated preparation process, and the need to use a large amount of solvents, the production of traditional aerogels is diffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
Inventor 陈洪兵刘波蒋树斌黄玮曾光
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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