Nano-diamond filled polyimide based compound aerogel material and preparation method thereof

A nano-diamond and composite airgel technology, which is applied in the field of nano-diamond-filled polyimide-based composite airgel materials and its preparation, can solve the problems of expensive cross-linking agents and limited use, and achieve design ideas Ingenious, low cost, strong water dispersion effect

Inactive Publication Date: 2017-05-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the crosslinking agent used in the preparation process of polyimide airgel is expensive and limited in use, and proposes a method of polyimide composite airgel reinforced with nano-diamonds

Method used

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  • Nano-diamond filled polyimide based compound aerogel material and preparation method thereof
  • Nano-diamond filled polyimide based compound aerogel material and preparation method thereof
  • Nano-diamond filled polyimide based compound aerogel material and preparation method thereof

Examples

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Embodiment 1

[0029] This embodiment includes the following steps:

[0030] by N,N -Dimethylacetamide is used as a solvent, and 4,4'-diaminodiphenyl ether and pyromellitic anhydride are used as monomers to carry out condensation polymerization in an ice-water bath to prepare polyamic acid filaments. The specific process is as follows: at room temperature, 8 g (0.04 mol) of 4,4′-diaminodiphenyl ether was fully dissolved in 95 g N,N -Dimethylacetamide, based on the clarity of the solution and the absence of particles. Then 8.85 g (0.046 mol) pyromellitic anhydride was added slowly, and then the reaction was moved to an ice-water bath and stirred for 2 h. Then add 0.04 mol triethylamine, continue to stir and react for about 2 h, and prepare a polyamic acid solution with a solid content of 15%. The prepared polyamic acid solution is sealed and stored, and after standing for two days, it is slowly poured into ice water, washed, frozen, and dried to obtain a water-soluble polyamic acid filam...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] The steps for preparing water-soluble polyamic acid are the same as in Example 1.

[0036] The steps of preparing polyimide-nanometer diamond composite airgel are as follows:

[0037] Take 40 mg of nano-diamonds and add them to 30 mL of deionized water, sonicate for 0.5 h to disperse the nano-diamonds evenly. Add 2 g of polyamic acid and 1 g of triethylamine into the obtained nanodiamond dispersion, sonicate for 1 h, and stir for 0.5 h to disperse the polyamic acid evenly, and obtain a polyamic acid-nanodiamond aqueous solution. All the other steps are the same as in Example 1. Obtain polyimide-nanometer diamond composite airgel, denoted as PI / ND 2% .

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] The steps for preparing water-soluble polyamic acid are the same as in Example 1.

[0041] The steps of preparing polyimide-nanometer diamond composite airgel are as follows:

[0042] Take 80 mg of nano-diamonds and add them to 30 mL of deionized water, and sonicate for 0.5 h to disperse the nano-diamonds evenly. All the other are with embodiment 2. Obtain polyimide-nanometer diamond composite airgel, denoted as PI / ND 4% .

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Abstract

The invention belongs to the technical field of porous compound aerogel and specifically relates to a nano-diamond filled polyimide based compound aerogel material and a preparation method thereof. The compound aerogel provided by the invention comprises the following raw materials: one or more of water-soluble polyimide precursor-polyamide acids and one or more of nano-diamonds. The preparation method of the compound aerogel comprises the following steps: preparing nano-diamond dispersion liquid; preparing polyamide acid-nano-diamond aerogel through a sol-gel process; preparing polyamide acid-nano-diamond aerogel through freeze drying; and preparing polyimide-nano-diamond compound aerogel through thermal amidation. The method provided by the invention is simple in process and low in cost; the compounding process is green and environment-friendly; the microstructure of the prepared compound aerogel is uniform; the aerogel is easy to stably disperse in water; and in addition, the compound aerogel has excellent mechanical strength and heat resistance and is an ideal heat-insulating flame-resistant material.

Description

technical field [0001] The invention belongs to the technical field of porous composite airgel, and in particular relates to a polyimide-based composite airgel material filled with nano-diamond and a preparation method thereof. Background technique [0002] Polymer aerogels based on natural or synthetic polymers are a new type of porous gel materials, which have the characteristics of easy molding, high porosity, high specific surface area, low density, low thermal conductivity and low dielectric constant. . Therefore, polymer airgel has gradually received attention in the fields of heat insulation, sound insulation and dielectric materials. However, polymer aerogels generally have problems such as poor mechanical properties, poor thermal stability, and flammability. The reason is mainly caused by the poor mechanical properties of the polymer matrix and the low thermal decomposition temperature. [0003] Among many polymer materials, polyimide, as an engineering plastic, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08K3/04C08L79/08
CPCC08J9/28C08J2379/08C08K3/04C08K2201/011C08L2203/14C08L79/08
Inventor 刘天西左立增樊玮郜伟鲁恒毅顾华昊赖飞立
Owner FUDAN UNIV
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