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Polyimide aerogel having infrared radiation resisting property and preparation method thereof

A radiation characteristic and polyimide technology, which is applied in the field of airgel with anti-infrared radiation characteristics and its preparation, can solve the problem of low density, weak thermal radiation resistance and reduced heat insulation performance of polyimide airgel and other problems, to avoid a sharp increase in thermal conductivity, good flexibility and mechanical properties, and expand the use of the effect

Active Publication Date: 2014-08-06
GUANGDONG ALISON HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the polyimide aerogels prepared by the existing methods have very low density and high porosity, they do not have the ability to resist thermal radiation.
When used at a higher temperature (150°C-300°C), the infrared radiation generated by the heating element directly passes through the polyimide airgel, resulting in a sharp drop in its thermal insulation performance, and a rapid increase in thermal conductivity (at 300°C can reach 0.045w / above), so the polyimide aerogels prepared by the existing methods all have the disadvantages of weak thermal radiation resistance and poor heat insulation performance when used at higher temperatures, which greatly limits the use in insulation Range of use in the thermal field

Method used

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  • Polyimide aerogel having infrared radiation resisting property and preparation method thereof

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Effect test

Embodiment 1

[0041] A preparation method of polyimide airgel with anti-infrared radiation characteristics, comprising the steps of:

[0042] (1) The reactor is dehydrated, and the vacuum is set below <40Pa;

[0043] (2) Under the protection of an inert gas, PMDA and ODA are put into a reactor at a molar ratio of 1:1.0 to carry out a polymerization reaction. The conditions of the polymerization reaction are: the temperature is controlled at 25° C., stirred for 5 hours, and a lyosol is formed;

[0044] (3) Add nano-carbon airgel micropowder according to 3% of the sol mass, and use ultrasonic vibration for 30min to measure the intrinsic viscosity of the mixed solution sol to be 0.8418g / dL;

[0045] (3) inject the mixed liquid sol into the mould, and age for 48 hours to obtain a gel;

[0046] (4) Place the gel in the reactor, introduce acetone to immerse the gel, and keep the vacuum below <40Pa for pressure impregnation for 4 hours;

[0047] (5) Discard the solvent, then vacuumize the solven...

Embodiment 2

[0050] A preparation method of polyimide airgel with anti-infrared radiation characteristics, comprising the steps of:

[0051](1) The reactor is dehydrated, and the vacuum is set below <40Pa;

[0052] (2) Under the protection of an inert gas, PMDA and ODA are put into a reactor at a molar ratio of 1:1.0 to carry out a polymerization reaction. The conditions of the polymerization reaction are: the temperature is controlled at 25° C., stirred for 5 hours, and a lyosol is formed;

[0053] (3) Add nano-titanium dioxide gel micropowder according to 3% of the sol mass, and use ultrasonic vibration for 30min to measure the intrinsic viscosity of the mixed solution sol to be 0.8402g / dL;

[0054] (3) inject the mixed liquid sol into the mould, and age for 48 hours to obtain a gel;

[0055] (4) Place the gel in the reactor, introduce acetone to immerse the gel, and keep the vacuum below <40Pa for pressure impregnation for 4 hours;

[0056] (5) Discard the solvent, then vacuumize the ...

Embodiment 3

[0059] A preparation method of polyimide airgel with anti-infrared radiation characteristics, comprising the steps of:

[0060] (1) The reactor is dehydrated, and the vacuum is set below <40Pa;

[0061] (2) Under the protection of an inert gas, PMDA and ODA are put into a reactor at a molar ratio of 1:1.0 to carry out a polymerization reaction. The conditions of the polymerization reaction are: the temperature is controlled at 25° C., stirred for 5 hours, and a lyosol is formed;

[0062] (3) Add nano-iron oxide airgel micropowder and nano-alumina airgel micropowder (1:1 ratio) according to 3% of the sol mass, and use ultrasonic vibration for 30min to measure the intrinsic viscosity of the mixed solution sol as 0.8518g / dL;

[0063] (3) inject the mixed liquid sol into the mould, and age for 48 hours to obtain a gel;

[0064] (4) Place the gel in the reactor, introduce acetone to immerse the gel, and keep the vacuum below <40Pa for pressure impregnation for 4 hours;

[0065] (...

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Abstract

The invention discloses polyimide aerogel having an infrared radiation resisting property and a preparation method thereof. The preparation method comprises the following steps: dehydrating through a reactor, carrying out a polymerization reaction to generate lyosol, preparing an infrared radiation blocker, aging the lyosol to obtain gel, and carrying out pressure infiltration, vacuum treatment and supercritical drying on the gel. The polyimide aerogel having the infrared radiation resisting property prepared by the preparation method disclosed by the invention is low in density, good flexibility and mechanical performance; the polyimide aerogel contains the nano-scale infrared radiation blocker which is uniformly distributed, and has properties of reflecting and absorbing infrared radiation at relatively high temperature, so that the aerogel is better than normal polyimide aerogel in heat insulating performance and is wider in using temperature range.

Description

technical field [0001] The invention relates to the technical field of polyimide materials, in particular to an airgel with anti-infrared radiation characteristics and a preparation method thereof. Background technique [0002] Polyimide has excellent heat resistance, mechanical properties, electrical properties and corrosion resistance. It is one of the organic polymer materials with the best comprehensive performance. , no obvious melting point, high insulation performance. Therefore, it is widely used in various applications as molding materials, composite materials, electrical and electronic materials, optical materials, and the like. However, most of the polyimide products currently on the market appear as the characteristics of polyimide resins, and their density is relatively high. [0003] The emergence of polyimide airgel greatly overcomes this shortcoming. It not only maintains the characteristics of high insulation and high temperature resistance of polyimide r...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L79/08C08K3/22C08K3/04C08K3/36C08G73/10
Inventor 张秋华陈文军卫荣辉刘平
Owner GUANGDONG ALISON HI TECH
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