Polyimide humidity-sensitive material and preparation method thereof

A polyimide moisture-sensitive material and polyimide moisture-sensitive technology are applied in the analysis of materials, material capacitance, and material analysis through electromagnetic means, which can solve the problems of hysteresis, large nonlinear output, poor hydrolysis resistance, Prone to degradation and other problems, to achieve the effects of improving stability, reducing adsorption, and increasing moisture absorption/dehumidification speed

Inactive Publication Date: 2015-05-06
NO 49 INST CHINESE ELECTRONICS SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems that the existing polyimide moisture-sensitive materials have large hysteresis and nonlinear output, and polyamic acid, the precursor of polyimide moisture-sensitive materials, is sensitive to water vapor, has poor hydrolysis resistance and is prone to degradation. And provide a kind of polyimide humidity sensitive material and preparation method thereof

Method used

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  • Polyimide humidity-sensitive material and preparation method thereof

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specific Embodiment approach 1

[0023] Specific Embodiment 1: A polyimide moisture-sensitive material of this embodiment, a polyimide moisture-sensitive material is firstly made of dianhydride, diamine, alcohol reagent, N,N'-diisopropyl carbon Diimine condensing agent, strong polar non-protonated solvent A and strong polar non-protonated solvent B are prepared to obtain polyamide ester powder, then polyamide ester powder is mixed with strong polar non-protonated solvent C, and solidified to obtain;

[0024] The molar ratio of the dianhydride to diamine is 1:(0.85~1.1); the mass ratio of the dianhydride to alcohol reagent is 1:(3~15); the dianhydride to N,N The molar ratio of '-diisopropylcarbodiimide condensing agent is 1:(1~10); the mass ratio of described dianhydride and strongly polar aprotonated solvent A is 1:(1~5); The mass ratio of the dianhydride to the strongly polar aprotonated solvent B is 1:(1~10); the mass ratio of the polyamide ester powder to the strongly polar aprotonated solvent C is 1:(1.5 ...

specific Embodiment approach 2

[0030] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the polyamide ester powder is specifically prepared according to the following steps: at room temperature, dianhydride is added to the alcohol reagent, and then at a temperature of Reflux at 78°C to 80°C for 1h to 12h, cool naturally to room temperature to obtain the diacid diester, place the diacid diester in an ice-water bath at a temperature of 1°C to 8°C to obtain a reaction system; dissolve the diamine In a strongly polar aprotic solvent A, a mixture A is obtained, and the N,N'-diisopropylcarbodiimide condensing agent is dissolved in a strongly polar aprotic solvent B to obtain a mixture B, at a temperature of In an ice-water bath at 1°C-8°C, first add mixture A to the reaction system, then add mixture B dropwise to the reaction system within 30min-60min, stir for 1h-2h, remove the ice-water bath, and then stir at room temperature React for 5h to 24h to obtain a reaction...

specific Embodiment approach 3

[0032] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: the alcohol reagent is methanol or ethanol. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a polyimide humidity-sensitive material and a preparation method thereof, relates to a humidity-sensitive material and a preparation method thereof, and aims at solving the problems that an existing polyimide humidity-sensitive material is in humidity hysteresis and large in nonlinear output, and a polyimide humidity-sensitive material precursor polyamide acid is sensitive to water vapor, poor in hydrolysis resistance and easy to degrade. The material is prepared from dianhydride, diamine, an alcohol reagent, an N,N'-diisopropylcarbondiimide condensing agent and a strong polar nonprotic solvent. The method comprises the following steps: adding the dianhydride to the alcohol reagent, reacting, putting into an ice water bath, and respectively dissolving the diamine and the N,N'-diisopropylcarbondiimide condensing agent into the strong polar nonprotic solvent to obtain a mixture A and a mixture B; respectively adding the mixture A and the mixture B to a reaction system in the ice water bath; washing, filtering and drying the product, and dissolving into the strong polar nonprotic solvent; and finally solidifying. The method is mainly applied to preparation of the polyimide humidity-sensitive material.

Description

technical field [0001] The invention relates to a moisture sensitive material and a preparation method thereof. Background technique [0002] Capacitive humidity sensors are widely used in industry, agriculture, meteorology, aerospace and other related fields due to their advantages such as wide test range, high sensitivity, small hysteresis, and fast response. Humidity sensitive material is an important part of humidity sensor and a key factor affecting the performance of humidity sensor. As a moisture-sensitive material, it is necessary to comprehensively consider the moisture absorption rate, air permeability, heat resistance, dielectric properties, and stability of the material. As a high-performance polymer, polyimide has low dielectric constant, small dielectric loss, high thermal stability and chemical stability, and has attracted the attention of many researchers in the field of humidity. However, the currently used polyimide moisture-sensitive materials also have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08G73/10G01N27/22
CPCC08G73/1007C08G73/1071C08L79/08G01N27/225
Inventor 王成杨金建东郑丽吴亚林司良有王亚彬
Owner NO 49 INST CHINESE ELECTRONICS SCI & TECH GRP
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