Tough cement-based piezoelectric composite material, preparation method and application thereof

A piezoelectric composite material, cement-based technology, applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve the problems of high brittleness and poor adhesion of concrete structures, and achieve the effects of good flexibility, reduced safety hazards, and high sensing accuracy.

Active Publication Date: 2020-03-17
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a tough cement-based piezoelectric composite material, which not only has excellent piezoelectric performance, but also has high toughness and good compatibility with concrete materials, which solves the problem of the existing cement-based piezoelectric materials being brittle and brittle. The problem of poor integration with the concrete structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The organic-inorganic metal halide perovskite used in this example is CH 3 NH 3 PB 3 , the preparation method is as follows: first weigh 7.9g of methylamine iodide, 23.15g of lead iodide powder and 40mL of DMF solution; place methylamine iodide, lead iodide and DMF solution in a 100mL beaker, and heat to 60 °C, the stirring time and temperature were 12 h and 60 °C, respectively, until a transparent yellow liquid was formed to construct the perovskite CH 3 NH 3 PB 3 ; Open the mouth of the beaker and continue heating and stirring until the solvent is completely volatilized into a powder, and finally put it into a vacuum drying oven at 60 ° C for 24 hours to obtain CH 3 NH 3 PB 3 Powder. After drying, pulverize the perovskite CH 3 NH 3 PB 3 The crystal particle size is 60-100nm.

[0026] The preparation method of the tough cement-based piezoelectric composite material of this embodiment is specifically:

[0027] Dissolve 5g of PVDF in 100g of DMF and stir even...

Embodiment 2

[0030] After dissolving 10g PVDF in 100g DMAc and stirring evenly, introduce 15g of the CH prepared in Example 1 3 NH 3 PB 3 Mix well with 10g of sulfoaluminate cement and pour it into a disc shape. The stirring temperature is 65°C. Finally, put it in room temperature water for curing for 48 hours. After 7 days, take it out and let it dry naturally to obtain a tough cement-based piezoelectric composite material.

[0031] In this example, the product made of tough cement-based piezoelectric composite material was obtained according to the method of Example 1, and its piezoelectric constant was 16.23 pC / N.

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PUM

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Abstract

The invention discloses a tough cement-based piezoelectric composite material, a preparation method and application thereof. The composite material is prepared by dispersing perovskite piezoelectric crystals and cement in certain proportion into a PVDF-based piezoelectric material. The composite material not only has excellent piezoelectric properties, but also has high toughness and good compatibility with a concrete material, and solves the problems of high brittleness and poor combination with overall concrete structure in existing cement-based piezoelectric materials. Also the composite material can be applied to preparation of a sensor for a concrete building structure in civil engineering, the prepared sensor has high sensitivity and sensing precision, and potential safety hazards are reduced.

Description

technical field [0001] The invention belongs to the technical field of functional composite materials, and in particular relates to a tough cement-based piezoelectric composite material for civil engineering sensors and a preparation method thereof. Background technique [0002] Cement-based piezoelectric composites refer to composite materials in which functional powders with piezoelectric effects are uniformly dispersed in a three-dimensional continuous cement matrix. It has good compatibility with concrete, and is simple to prepare, uniform in structure, controllable in composition, and low in cost. , offshore oil production platforms and port facilities, etc.) for long-term safety detection and monitoring, and can also detect the speed and load of vehicles passing on road bridges online to ensure the service life, operating economy and traffic safety of road bridges. At present, although the interface and acoustic impedance of traditional cement piezoelectric materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06B28B1/14
CPCC04B28/04C04B28/06B28B1/14C04B24/12C04B24/2682
Inventor 祝瑜张召才王东刘仁俊陈旭张津瑞李宗津
Owner HENAN POLYTECHNIC UNIV
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