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Waterborne polypyrrole cement-based conductive composite material, preparation method and application

A conductive composite material, polypyrrole technology, applied in conductive materials, conductive materials, conductors and other directions, can solve the problems of inability to improve the conductive properties of composite materials, reduce mechanical properties, etc., achieve good pressure-sensitive properties and electrical-thermal properties, improve The effect of electrical conductivity and durability

Active Publication Date: 2018-06-22
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of cement-based composite materials using conductive polymers as conductive fillers has not yet been reported. The reasons are as follows: ①Cement belongs to an alkaline environment, while conductive polymers such as polyaniline need to be developed under acidic conditions. It has good electrical properties; ② Conductive polymers are generally insoluble in water and have hydrophobicity, which is difficult to disperse in the cement matrix and will be agglomerated in a large amount in the matrix, which not only cannot improve the electrical conductivity of the composite material, but will reduce its mechanical properties. performance

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  • Waterborne polypyrrole cement-based conductive composite material, preparation method and application
  • Waterborne polypyrrole cement-based conductive composite material, preparation method and application

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[0024] Another embodiment of the present invention provides a preparation method of water-based polypyrrole cement-based conductive composite material, comprising the following steps: (1) get the purified pyrrole monomer and place it in a round-bottomed flask, add an aqueous solution of sodium lignosulfonate, ice Under the condition of stirring in a water bath, FeCl was added dropwise 3 Aqueous solution, reacted for 8-12 hours under stirring conditions at room temperature, and made water-based polypyrrole polymer through suction filtration, drying, and grinding; (2) dissolving the water-based polypyrrole polymer prepared in step (1) in distilled water, adding Put it into a clean paddle mixer containing Portland 425 cement, stir at a slow speed for 120 seconds, then pause for 15 seconds and turn to medium and high speed for 120 seconds; (3) pour the stirred cement-based composite material into the mold, and vibrate , steam curing process, made of water-based polypyrrole cement-...

Embodiment 1

[0031] (1) Take 0.5mL of purified pyrrole monomer and place it in a 250mL round bottom flask, add 5mL of 1mol / L sodium lignosulfonate aqueous solution, and add 1mol / L of FeCl dropwise under the condition of stirring in an ice-water bath 3 5mL of aqueous solution, reacted at room temperature for 8 hours, then filtered, dried, and ground to make water-based polypyrrole polymer;

[0032] (2) Dissolve the water-based polypyrrole polymer prepared in step (1) in 10mL of distilled water, add it to a clean paddle mixer containing 1300g of Portland 425 cement, stir at a slow speed for 120 seconds, then pause for 15 seconds and turn to Stir at medium and high speed for 120 seconds;

[0033] (3) Pouring the stirred cement-based composite material into a mould, and undergoing vibration and steam curing processes to make a water-based polypyrrole cement-based conductive composite material.

Embodiment 2

[0035](1) Take 1 mL of purified pyrrole monomer and place it in a 250 mL round bottom flask, add 5 mL of 1 mol / L sodium lignosulfonate aqueous solution, and add 1 mol / L of FeCl dropwise under the condition of stirring in an ice-water bath 3 5mL of aqueous solution, reacted at room temperature for 8 hours, then filtered, dried, and ground to make water-based polypyrrole polymer;

[0036] (2) Dissolve the water-based polypyrrole polymer prepared in step (1) in 10mL of distilled water, add it to a clean paddle mixer containing 1300g of Portland 425 cement, stir at a slow speed for 120 seconds, then pause for 15 seconds and turn to Stir at medium and high speed for 120 seconds;

[0037] (3) Pouring the stirred cement-based composite material into a mould, and undergoing vibration and steam curing processes to make a water-based polypyrrole cement-based conductive composite material.

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Abstract

The invention relates to the field of materials, in particular to a waterborne polypyrrole cement-based conductive composite material as well as a preparation method and application thereof. The composite material which has good electrical conductivity, self-sensing performance and mechanical property is prepared by preparing a waterborne polypyrrole conductive polymer with good electrical conductivity and water solubility, taking the waterborne polypyrrole conductive polymer as a conductive filler and adding the waterborne polypyrrole conductive polymer into a cement matrix. The waterborne polypyrrole cement-based conductive composite material is prepared from waterborne polypyrrole and cement, wherein the mass ratio of the waterborne polypyrrole to the cement is equal to 1 to (800 to 5000); the waterborne polypyrrole is obtained by carrying out aqueous polymerization on a pyrrole monomer. The waterborne polypyrrole can be evenly dispersed into the cement matrix and forms a three-dimensional space conductive network, so that the electrical conductivity of the cement-based composite material is greatly improved, and the cost is low.

Description

technical field [0001] The invention belongs to the field of conductive materials, and in particular relates to a cement-based conductive composite material, in particular to a water-based polypyrrole cement-based conductive composite material, a preparation method and an application. Background technique [0002] Self-sensing cement-based composite material is an intelligent cement-based composite material that integrates structure and sensing functions. By adding an appropriate amount of conductive filler to the ordinary cement matrix, and using a certain process to disperse the filler in the matrix. production. Under the action of the force field, the microstructure in the composite material changes, which affects the conductive path, which leads to regular changes in its resistivity, and has two sensory characteristics: pressure sensitive and pull sensitive. [0003] At present, the widely used conductive fillers include carbon black, carbon fiber, carbon nanotubes, ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C08G73/06H01B1/12
CPCC04B28/04C08G73/0611H01B1/127C04B24/28
Inventor 冯超万菲刘强蔡祥钟丽杰
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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