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Anisotropic polyvinyl alcohol aerogel material and preparation method thereof

A polyvinyl alcohol, anisotropic technology, applied in the field of polyvinyl alcohol airgel materials, can solve problems such as limiting the scope of use of PVA airgel

Active Publication Date: 2018-04-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the PVA airgel prepared is isotropic, and the mechanical properties of this airgel are isotropic, which makes it unable to meet the requirements of different properties of materials in various directions under certain complex application conditions. Severely limit the scope of use of PVA airgel

Method used

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  • Anisotropic polyvinyl alcohol aerogel material and preparation method thereof
  • Anisotropic polyvinyl alcohol aerogel material and preparation method thereof
  • Anisotropic polyvinyl alcohol aerogel material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Preparation of polyvinyl alcohol aerogel by freezing method

[0040] 1. Prepare a 6wt% aqueous solution of PVA

[0041] Take 10g of polyvinyl alcohol, add 156.7g of deionized water, fully swell, heat and stir to dissolve the polyvinyl alcohol.

[0042] 2. Preparation of polyvinyl alcohol aerogel by freezing method

[0043] The 6wt% aqueous PVA solution prepared in step 1 was poured into the mold. Prepare a mixture of dry ice and ethanol as a freezing liquid in a large container, and prepare a freezing liquid with a temperature of -70°C according to the amount of dry ice added. Put a mold containing a 6wt% PVA aqueous solution into a container containing a freezing liquid at -70°C, the liquid level of the freezing liquid is higher than the liquid level in the mold, and the freezing direction from the periphery of the mold to the center of the mold is realized.

[0044] When the solution in the mold is completely frozen into a solid, put it in a freeze dryer for freeze ...

Embodiment 2

[0045] Example 2 Preparation of polyvinyl alcohol aerogel by freezing method

[0046] 1. PVA aqueous solution with a concentration of 8wt%

[0047] Take 10 g of polyvinyl alcohol, add 115 g of deionized water, fully swell, heat and stir to dissolve the polyvinyl alcohol.

[0048] 2. Preparation of polyvinyl alcohol aerogel by freezing method

[0049] The PVA aqueous solution with a concentration of 8 wt% prepared in step 1 is poured into the mold. Prepare a mixture of dry ice and ethanol as a freezing liquid in a large container, and prepare a freezing liquid with a temperature of -60°C according to the amount of dry ice added. Put the mold containing the 8wt% PVA aqueous solution into the container containing the freezing liquid at -60°C, the liquid level of the freezing liquid is higher than the liquid level in the mold, and the freezing direction from the periphery of the mold to the center of the mold is realized.

[0050] When the solution in the mold is completely frozen into a ...

Embodiment 3

[0051] Example 3 Preparation of polyvinyl alcohol aerogel by freezing method

[0052] 1. PVA aqueous solution with a concentration of 10wt%

[0053] Take 10g of polyvinyl alcohol, add 90g of deionized water, fully swell, heat and stir to dissolve the polyvinyl alcohol.

[0054] 2. Preparation of polyvinyl alcohol aerogel by freezing method

[0055] Pour the 10wt% PVA aqueous solution prepared in step 1 into the mold. Prepare a mixture of dry ice and ethanol as a freezing liquid in a large container, and prepare a freezing liquid with a temperature of -65°C according to the amount of dry ice added. The mold containing the PVA aqueous solution with a concentration of 10wt% is placed in a container containing a freezing liquid at -65°C. The liquid level of the freezing liquid is higher than the liquid level in the mold to realize the freezing direction from the periphery of the mold to the center of the mold.

[0056] When the solution in the mold is completely frozen into a solid, put i...

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Abstract

The invention discloses an anisotropic polyvinyl alcohol aerogel material and a preparation method thereof, and belongs to the field of aerogel materials. The preparation method includes the steps: (1) dissolving polyvinyl alcohol in deionized water to obtain polyvinyl alcohol water solution; (2) pouring the polyvinyl alcohol water solution prepared in the step (1) into molds, placing the molds into a container with refrigerating fluid to freeze the molds, and freeze-drying the molds after the water solution in the molds are freezed into frozen solid to obtain the anisotropy polyvinyl alcoholaerogel material. The polyvinyl alcohol aerogel material is prepared by a specific freezing method, the polyvinyl alcohol water solution is frozen by the aid of refrigerating fluid in a specific direction, and the aerogel material prepared by controlling a frozen direction has anisotropy structures and performances. The polyvinyl alcohol aerogel material has wide application prospects in the fields of matter adsorption, matter separation, heat insulation protection, acoustic damping, catalysts, drug carriers and the like.

Description

Technical field [0001] The invention belongs to the field of aerogel materials, and specifically relates to an anisotropic polyvinyl alcohol aerogel material. Background technique [0002] Aerogel is a new type of solid porous material that fills most of its internal space with air medium. It has the characteristics of extremely low density, high porosity, and low thermal conductivity. It is used in heat insulation materials, gas separation and filtration. , Catalysts and drug carriers, substance adsorption and acoustic damping have a wide range of application prospects. [0003] Polyvinyl alcohol (PVA) is a non-toxic, non-corrosive, and biodegradable water-soluble organic polymer. Polyvinyl alcohol aerogel is an organic aerogel mainly composed of polyvinyl alcohol material. Compared with inorganic aerogels, polyvinyl alcohol aerogels have good toughness, biodegradable, water-soluble, low thermal conductivity and excellent thermal insulation properties. Because polyvinyl alcohol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L29/04
CPCC08J9/286C08L29/04C08J2201/0484C08J2329/04
Inventor 刘鹏波余智吴鹏陈少康邹华维
Owner SICHUAN UNIV
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