Gas-sensitive conducting composite material of aqueous polyurethane group and preparation method

A conductive composite material and water-based polyurethane technology are applied in the field of water-based polyurethane-based gas-sensing conductive composite materials and their preparation to achieve excellent electrical conductivity and reduce the effect of percolation value.

Inactive Publication Date: 2008-07-16
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] However, filled gas-sensitive conductive polymer composites usually only show strong gas-sensing responses to good solvents of matrix polymer materials.

Method used

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  • Gas-sensitive conducting composite material of aqueous polyurethane group and preparation method
  • Gas-sensitive conducting composite material of aqueous polyurethane group and preparation method
  • Gas-sensitive conducting composite material of aqueous polyurethane group and preparation method

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Embodiment Construction

[0023] The ratio table 1 of embodiment 1~8, its preparation method concrete steps are as follows:

[0024] 1. Synthesis of permanent polyurethane prepolymer: Add the dried oligomer polyol and diisocyanate into the reaction kettle according to the ratio of 6:1 to 2:1, add the catalyst, and react at 70-120°C 8-14 hours, the amount of catalyst used is 0.5% of the amount of polyol.

[0025] 2. Add pre-dried conductive carbon black to the reaction kettle and continue to react for 8-14 hours.

[0026] 3. Cool down to below 50°C, add neutralizing agent triethylamine to neutralize for 1 hour

[0027] 4. Add deionized water for emulsification, and at the same time add chain extender ethylenediamine for chain extension reaction for 3 to 6 hours.

[0028] 5. Emulsion discharge is filtered to obtain composite material emulsion, which is stored for later use.

[0029] 6. The emulsion is coated on the electrode plate and dried at room temperature for 2 weeks to obtain a composite materia...

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Abstract

A composition formula and preparation method for high polymer composite of air-sensitive conduction are disclosed by the present invention. The composite can be prepared by using water polyurethane containing polar hard section and nonpolar soft section as base body to compound with conductive packing.

Description

technical field [0001] The invention relates to a composition formula and a manufacturing method for preparing a conductive polymer composite material with broad-spectrum gas-sensing properties by using conductive carbon black to fill a water-based polyurethane matrix. Background technique [0002] Conductive polymer composite materials with gas-sensitive response characteristics composed of conductive fillers (such as carbon black, etc.) High responsivity and other characteristics, its working principle is that in a certain organic solvent vapor, the matrix polymer of the composite material swells, resulting in an increase in the distance between the conductive fillers that were in close contact, which is manifested as an increase in the resistance of the composite material. On this basis, the gas-sensitive conductive polymer composite material composed of conductive filler filled polymer blend matrix can significantly reduce the percolation value of the composite material,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08G18/10C08K3/22
Inventor 章明秋陈仕国胡继文容敏智
Owner SUN YAT SEN UNIV
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