Three-phase conductive composite material, preparation method and application

A conductive composite material, three-phase technology, applied in the direction of conductive materials, conductive materials, conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of inability to improve the electrical conductivity of composite materials, reduce mechanical properties, etc., and achieve good compression Sensitivity and electro-thermal properties, low cost, excellent electrical conductivity

Active Publication Date: 2018-09-04
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Abstract
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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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  • Three-phase conductive composite material, preparation method and application
  • Three-phase conductive composite material, preparation method and application

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preparation example Construction

[0025] Another embodiment of the present invention provides a method for preparing a carbon nanotube / water-based polypyrrole / cement three-phase conductive composite material, comprising the following steps: (1) weighing the purified pyrrole monomer in a round bottom flask, adding Sodium lignosulfonate aqueous solution, under the condition of stirring in an ice-water bath, add FeCl dropwise 3 Aqueous solution, reacted at room temperature for 8-12 hours, filtered, dried, and ground to make water-based polypyrrole; (2) dissolve the water-based polypyrrole prepared in step (1) in distilled water, and add to the Portland-containing In the clean paddle mixer of 425 cement and purified carbon nanotubes, 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 and other processes to make carbon nanotube / polypyrrole / cement three-phase ...

Embodiment 1

[0032] (1) Measure 0.5 mL of purified pyrrole monomer into 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 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;

[0033](2) Dissolve the water-based polypyrrole prepared above in 10 mL of distilled water, add 1300 g of Portland 425 cement and 0.8 g of purified carbon nanotubes to a clean paddle stirrer, stir at a slow speed for 120 seconds, then pause for 15 seconds and turn to medium Stir at high speed for 120 seconds;

[0034] (3) Pouring the stirred cement-based composite material into a mold, and through processes such as vibration and steam curing, a carbon nanotube / water-based polypyrrole / cement three-phase conductive composite material is produced.

Embodiment 2

[0036] (1) Measure 0.8 mL of purified pyrrole monomer in a 250 mL round bottom flask, add 5 mL of 1.5 mol / L sodium lignosulfonate aqueous solution, and add 1.5 mol / L of FeCl dropwise under stirring in an ice-water bath 3 5mL of aqueous solution, reacted at room temperature for 10 hours under stirring conditions, and made water-based polypyrrole through suction filtration, drying and grinding;

[0037] (2) Dissolve the water-based polypyrrole prepared above in 10 mL of distilled water, add 1300 g of Portland 425 cement and 0.8 g of purified carbon nanotubes to a clean paddle stirrer, stir at a slow speed for 120 seconds, then pause for 15 seconds and turn to medium Stir at high speed for 120 seconds;

[0038] (3) Pouring the stirred cement-based composite material into a mold, and through processes such as vibration and steam curing, a carbon nanotube / water-based polypyrrole / cement three-phase conductive composite material is produced.

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Abstract

The invention relates to the field of materials, in particular to a three-phase conducting composite material. An aqueous polypyrrole conducting polymer with good conductivity and water-soluble performance is prepared; the aqueous polypyrrole conducting polymer is used as a conducting filler to be added into a cement base body together with a carbon nano tube; the composite material with good conductivity, self sensing performance and mechanical performance is obtained. The mass ratio of aqueous polypyrrole to cement is 1:(800 to 5000); the mass ratio of the carbon nano tube to the cement is (0.8 to 1.2):(1300 to 1500); the aqueous polypyrrole is obtained from pyrrole monomers through aqueous polymerization. The aqueous polypyrrole and the carbon nano tube are jointly added into the cement base body; a space conducting network of a polypyrrole-carbon nano tube dual conducting channel is formed; the electrical conductivity is improved by 5 to 7 times than a cement base composite material with the same carbon nano tube content; 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 carbon nanotube / water-based polypyrrole / cement three-phase conductive composite material. 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, steel fibers, steel sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04H01B1/18H01B1/12C08G73/06
CPCC04B28/04C04B2111/94C08G73/0611H01B1/127H01B1/18C04B14/026C04B24/28
Inventor 冯超黄微波万菲赵斌刘强蔡祥李亚男
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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