A kind of airgel material and preparation method thereof

An aerogel and polymer technology, applied in chemical instruments and methods, colloidal chemistry, colloidal chemistry, etc., can solve the problems of uneven material properties, low preparation efficiency, environmental and personnel safety, etc., and achieve easy promotion and production efficiency. High, enhanced adhesion effect

Inactive Publication Date: 2016-08-17
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • 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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  • A kind of airgel material and preparation method thereof

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Effect test

Embodiment 1

[0022] Firstly, 0.8 g of polyvinyl alcohol (Mw 31,000~50,000, degree of alcoholysis 99%) was heated and dissolved in 100 mL of deionized water, and 15 g of montmorillonite was added and stirred at high speed until uniform colloid, and the total dose of 1 KGy irradiation cross-linking, the product was quickly frozen at -78 °C (dry ice ethanol bath) until the ice crystals grew completely, and vacuum freeze-dried at room temperature until completely dry.

Embodiment 2

[0024] First, add 1 g of montmorillonite into 100 mL of deionized water, stir at high speed until a uniform suspension is formed, then heat and dissolve 20 g of polyvinyl alcohol (Mw 31,000~50,000, degree of alcoholysis 99%) in the above suspension, A total dose of 200 kGy was used for irradiation crosslinking under gamma rays, and the product was quickly frozen at -78 °C (dry ice ethanol bath) until the ice crystals grew completely, and then vacuum freeze-dried at room temperature until completely dry.

Embodiment 3

[0026] Firstly, 10 g of polyvinyl alcohol (Mw 31,000~50,000, alcoholysis degree 99%) was heated and dissolved in 100 mL of deionized water, then 5 g of calcine was added and stirred at high speed until uniform colloid, and the total dose was 100 g under gamma rays. KGy irradiation cross-linking, the product was quickly frozen at -78 °C (dry ice ethanol bath) until the ice crystals grew completely, and vacuum freeze-dried at room temperature until completely dry.

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Abstract

The invention provides an airgel material and a preparation method thereof. The material is prepared by blending a polymer and clay in an aqueous solution, irradiating cross-linking, and freeze-drying, wherein the polymer is 5% by airgel weight. ‑95%, clay 95‑5% by weight of airgel, airgel density between 0.03‑0.20 g / cm 3 . The preparation method of the airgel material of the present invention comprises the following steps in turn: a dissolving the polymer in deionized water, adding clay, and stirring until a uniformly distributed suspension; b dissolving the suspension obtained in step a) in Carry out irradiation cross-linking under high-energy rays, the irradiation dose of high-energy rays is 1 kGy-200 kGy; c freeze the irradiated product obtained in step b) and freeze-dry to form the desired product. Since only water is used as a solvent in the preparation process, chemical cross-linking agents are not required for radiation cross-linking, the cross-linking is highly efficient and controllable, the cross-linking density is uniform, the preparation process is green and environmentally friendly, and the production efficiency is high.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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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