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Shape memory aerogel material and preparation method thereof

An aerogel, memory technology, applied in aerogel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of high chemical activity of memory resin, unsuitable for use environment, etc., achieve low density, low cost, porosity, etc. high rate effect

Active Publication Date: 2018-06-29
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the polyurethane shape memory airgel material is a thermoplastic shape memory airgel material, and the shape memory material used in some environments such as space technology must be a thermosetting material. Iridine ester shape memory airgel materials are not suitable for such use environment
More importantly, thermosetting shape memory resin has high chemical activity and is easy to cross-link to form a network structure instead of a nanoporous three-dimensional network skeleton structure, so it has not been used to prepare aerogels with a nanoporous three-dimensional network skeleton structure. Material

Method used

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  • Shape memory aerogel material and preparation method thereof
  • Shape memory aerogel material and preparation method thereof
  • Shape memory aerogel material and preparation method thereof

Examples

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preparation example Construction

[0029] The present invention provides a kind of preparation method of shape memory airgel material in the first aspect, described method comprises the following steps:

[0030] (1) dissolving the shape memory resin in the first solvent to obtain a sol;

[0031] (2) adding a curing agent to the sol obtained in step (1) and stirring to a gel state to obtain a wet gel; and

[0032] (3) The wet gel obtained in step (2) is sequentially subjected to gelation, aging and solvent replacement steps to obtain an elastic gel, and then the elastic gel is dried to obtain a shape memory airgel material.

[0033] According to some preferred embodiments, the shape memory resin is a thermotropic shape memory resin, and the thermotropic shape memory resin is preferably bisphenol A epoxy resin (also known as bisphenol A diglycidyl ether); The first solvent is selected from the group consisting of N,N-dimethylformamide, acetone and ethanol; preferably, the first solvent is N,N-dimethylformamide; ...

Embodiment 1

[0050] ① Preparation of epoxy resin wet gel

[0051] Bisphenol A type epoxy resin (the trade mark is E-51) 5g is dissolved in the N of 50g, N-dimethylformamide (DMF) solvent, magnetic force stirs 10 minutes under room temperature, obtains sol; Slowly pour 0.88 g of curing agent triethylenetetramine (purity 69%) into the sol, stir slowly for 10 minutes, and dissolve in a transparent gel state to obtain a wet gel. Remove the ice bath and seal with a plastic wrap.

[0052] ②Gelation, aging and solvent replacement of wet gel

[0053] Place the wet gel prepared in ① not wrapped in plastic wrap in an oven at 60°C for 24 hours at a constant temperature, then take it out and let it stand at room temperature for 72 hours; add N,N-dimethylformamide every 24 hours (5mL) to prevent the gel from drying and cracking; separate the gel from the container boundary, take out the gel, and perform solvent replacement on the aged gel, first remove the excess solvent in the gel, add 10 times the v...

Embodiment 18

[0058] Embodiment 18 is basically the same as Embodiment 2, except that the curing agent is not added dropwise under the condition of ice bath.

[0059] Table 1: Raw material ratios of Examples 1-18 and performance indexes of the prepared shape-memory airgel materials.

[0060]

[0061] In particular, the symbol - indicates that there is no such component.

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Abstract

The invention relates to a shape memory aerogel material and a preparation method thereof. The preparation method comprises following steps: (1) dissolving shape memory resin in a first solvent to obtain sol; (2) adding a curing agent into the sol, and stirring the sol until the sol reaches a gel state to obtain wet gel; and (3) subjecting the wet gel to steps of gelling, aging, and solvent displacement to obtain elastic gel, and finally drying the elastic gel to obtain the shape memory aerogel material. A soil-gel method is adopted to combine a shape memory material and an aerogel structure to prepare the shape memory aerogel material. The preparation process is simple, and the cost is low. The prepared shape memory aerogel material has the advantages of high porosity (88-99%), high shaperecovery rate (90-100%), and adjustable deformation and recovery temperatures (glass-transition temperature: 40-120 DEG C).

Description

technical field [0001] The invention belongs to the technical field of airgel preparation, and in particular relates to a shape memory airgel material and a preparation method thereof. Background technique [0002] Airgel is a new type of lightweight nanoporous amorphous solid material formed by the aggregation of nanoscale ultrafine particles, and its porosity can be as high as 98%. The nano three-dimensional network skeleton structure of this kind of material makes it have excellent characteristics such as low refractive index, low dielectric constant, high optical transmittance, low density and low thermal conductivity. Since the first discovery of airgel in 1931, after nearly a century of development, various types of airgel materials have been prepared, ranging from inorganic silica, alumina, titanium oxide, iron oxide and their hybrid composites, Carbon aerogels can be prepared by sintering organic polymer aerogels under an inert gas protective atmosphere. The divers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 张恩爽刘韬裴雨辰李文静郭慧刘斌赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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