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A polyimide film for high-altitude humidity detection and its preparation method

A polyimide film and humidity detection technology, which is applied in the field of polyimide film and its preparation for high-altitude humidity detection, can solve the problems of hysteresis, adsorption and desorption of water molecules, etc., and achieve rapid adsorption and removal, humidity sensitivity The effect of high and low packing density

Active Publication Date: 2016-03-30
北京航天微电科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a polyimide film for high-altitude humidity detection and its preparation method, so as to solve the problem of hysteresis in the adsorption and desorption of water molecules in high-molecular materials commonly used in the production of humidity-sensitive films in low-temperature and high-humidity environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The molar mass ratio of dianhydride and diamine in polyamic acid with a solid content of 10% is 1:1, and the molar ratio of dianhydride 6FDA to PMDA is 1:2. The polyamic acid diluted to 60cp by DMAc is thermally imidized to obtain a polyimide film, and its specific preparation method is as follows.

[0024] The first step of polyamic acid synthesis

[0025] 2.00g ODA was dissolved in 44.37g DMAc with mechanical stirring at room temperature, and then 1.48g 6FDA and 1.45g PMDA were gradually added under ice bath conditions. After complete dissolution, a polyamic acid solution with a viscosity of 1000 cp was synthesized, in which the molar ratio of 6FDA to PMDA was 1:2.

[0026] The second step is the dilution of polyamic acid

[0027] N,N'-dimethylacetamide (DMAc) was used as solvent, and 23.87g of DMAc was added to dilute the polyamic acid into a low-viscosity solution with a viscosity of 60cp.

[0028] Preparation of the third step polyamic acid film

[0029] The po...

Embodiment 2

[0033] The molar mass ratio of dianhydride and diamine in polyamic acid with a solid content of 16% is 1:1.1. The polyamic acid diluted to 60cp by DMAc is thermally imidized to obtain a polyimide film, and its specific preparation method is as follows.

[0034] The first step of polyamic acid synthesis

[0035] 2.20 g of ODA was dissolved in 23.00 g of DMAc with mechanical stirring at room temperature, and then 2.18 g of PMDA was gradually added under ice-bath conditions. After being completely dissolved, a polyamic acid solution with a viscosity of 1600cp was synthesized.

[0036] The second step is the dilution of polyamic acid

[0037] N,N'-dimethylacetamide (DMAc) was used as solvent, and 45.62g of DMAc was added to dilute the polyamic acid into a low viscosity solution with a viscosity of 60cp.

[0038] Preparation of the third step polyamic acid film

[0039] The polyamic acid diluted to a viscosity of 60cp is dropped on the surface of the substrate material, and the...

Embodiment 3

[0043] The molar mass ratio of dianhydride and diamine in polyamic acid with a solid content of 20% is 1:1, and the molar ratio of dianhydride 6FDA to PMDA is 2:1. The polyamic acid diluted to 80cp by DMF is thermally imidized to obtain a polyimide film, and its specific preparation method is as follows.

[0044] The first step of polyamic acid synthesis

[0045] 2.00 g ODA was dissolved in 22.76 g DMF with mechanical stirring at room temperature, and then 2.96 g 6FDA and 0.73 g PMDA were gradually added under ice bath conditions. After complete dissolution, a polyamic acid solution with a viscosity of 2000cp was synthesized, in which the molar ratio of 6FDA to PMDA was 2:1.

[0046] The second step is the dilution of polyamic acid

[0047] Using N,N'-dimethylformamide (DMF) as a solvent, add 42.68g of DMF to dilute the polyamic acid into a low viscosity solution with a viscosity of 80cp.

[0048] Preparation of the third step polyamic acid film

[0049] The polyamic acid di...

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Abstract

The invention discloses a polyimide film used for high-altitude humidity detection and a preparation method thereof. The polyimide film is obtained by high-temperature imidization of polyamic acid, and the polyamic acid is composed of 5%-20% It is composed of a mixture of diamine and dianhydride and 80%-95% of non-protonated solvent, wherein the molar mass ratio of diamine and dianhydride in the mixture of diamine and dianhydride is 1:0.8-1.2. The specific steps of the preparation method are: synthesizing polyamic acid, diluting polyamic acid, preparing polyamic acid film, imidizing the polyamic acid film together with the substrate material; polyimide film. The polyimide film of the present invention has good moisture absorption and dehumidification characteristics, fast adsorption and desorption of water molecules, and high humidity sensitivity; the implementation process of the preparation method is simple and easy to process, and it is suitable for use in the field of humidity detection, especially high-altitude humidity The application prospect in the field of detection is good.

Description

technical field [0001] The invention relates to a polyimide film and a preparation method thereof, in particular to a polyimide film used for high-altitude humidity detection and a preparation method thereof. Background technique [0002] The International Meteorological Organization has continuously increased the requirements for high-altitude humidity detection. It is required to improve the humidity sensitivity characteristics of the humidity-sensing film layer in the capacitive humidity detection device, including the humidity response accuracy and speed. The water molecule content in the moisture-sensitive film changes simultaneously with the ambient humidity. When the content of water molecules in the moisture-sensitive film changes, the dielectric constant of the film material changes accordingly, resulting in a change in the capacitance value. Currently known moisture-sensitive films used in capacitive humidity detection devices mainly include electrolytes, polymer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08G73/10C08J5/18
Inventor 边旭明武德珍田国峰张伟彭文武
Owner 北京航天微电科技有限公司
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