Method for improving thermoelectric properties of cement-based composite material by ionic liquid

A technology of composite materials and ionic liquids, which is applied in the field of preparation of cement-based composite materials, can solve the problems of poor thermoelectric performance and achieve the effects of improved thermoelectric performance, simple production process, and high ion mobility

Active Publication Date: 2018-07-10
西安华清科教产业(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the shortcomings such as poor comprehensive thermoelectric properties of cement-based composite materials in the above-mentioned prior art, the object of the present invention is to provide a method for improving the thermoelectric properties of cement-based composite materials by ionic liquids,

Method used

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  • Method for improving thermoelectric properties of cement-based composite material by ionic liquid
  • Method for improving thermoelectric properties of cement-based composite material by ionic liquid
  • Method for improving thermoelectric properties of cement-based composite material by ionic liquid

Examples

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Embodiment 1

[0029] Example 1: Sulphoaluminate cement, PAN-based chopped carbon fibers, expanded graphite and [Bmim]Br ionic liquid were weighed according to the mass ratio of 100.0:1.2:5.0:1.0 before use.

[0030] First, the chopped carbon fibers are dispersed into a monofilament state using a mortar mixer. Secondly, pour the weighed sulfoaluminate cement, PAN-based chopped carbon fiber in monofilament state, expanded graphite and [Bmim]Br ionic liquid into the mortar mixer and stir for 3 minutes, then pour the stirred mixture into Put it into the roller type sand mixer and continue to stir until the color is uniform. After the stirring is completed, put it in a steel mold, and prepare the cement-based composite material green body through the press molding process, and then make the green body at a humidity of more than 90% and a temperature of 20- Curing at 25°C until the cement is completely hydrated to obtain a cement-based composite material doped with ionic liquids.

[0031] The el...

Embodiment 2

[0032] Example 2: Sulphoaluminate cement, PAN-based chopped carbon fibers, expanded graphite and [Bmim]Br ionic liquid were weighed according to the mass ratio of 100.0:1.2:5.0:2.0 before use.

[0033] First, the chopped carbon fibers are dispersed into a monofilament state using a mortar mixer. Secondly, pour the weighed sulfoaluminate cement, PAN-based chopped carbon fiber in monofilament state, expanded graphite and [Bmim]Br ionic liquid into the mortar mixer and stir for 3 minutes, then pour the stirred mixture into Put it into the roller type sand mixer and continue to stir until the color is uniform. After the stirring is completed, put it in a steel mold, and prepare the cement-based composite material green body through a pressurized molding process, and then make the green body at a humidity of more than 90% and a temperature of 20- Curing at 25°C until the cement is completely hydrated to obtain a cement-based composite material doped with ionic liquids.

[0034] Th...

Embodiment 3

[0035] Example 3: Sulphoaluminate cement, PAN-based chopped carbon fibers, expanded graphite and [Bmim]Br ionic liquid were weighed according to the mass ratio of 100.0:1.2:5.0:3.0 before use.

[0036] First, the chopped carbon fibers are dispersed into a monofilament state using a mortar mixer. Secondly, pour the weighed sulfoaluminate cement, PAN-based chopped carbon fiber in monofilament state, expanded graphite and [Bmim]Br ionic liquid into the mortar mixer and stir for 3 minutes, then pour the stirred mixture into Put it into the roller type sand mixer and continue to stir until the color is uniform. After the stirring is completed, put it in a steel mold, and prepare the cement-based composite material green body through a pressurized molding process, and then make the green body at a humidity of more than 90% and a temperature of 20- Curing at 25°C until the cement is completely hydrated to obtain a cement-based composite material doped with ionic liquids.

[0037]The...

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Abstract

Provided is a method for improving thermoelectric properties of a cement-based composite material by an ionic liquid. In the process of preparation of the cement-based composite material, the ionic liquid 1-butyl-3-methyl imidazolium bromide ([Bmim]Br) is added. The ionic liquid 1-butyl-3-methyl imidazolium bromide ([Bmim]Br), a carbon fiber, expanded graphite, sulphoaluminate cement and water areevenly mixed by a stirring process, and the mixture is pressed to form the cement-based composite material. The prepared cement-based composite material has the characteristics of high Seebeck coefficient, good thermoelectric property, low cost, simple production process and the like. In the case of greatly increasing the Seebeck coefficient, due to high ionic migration rate of the used ionic liquid, the electrical conductivity of the cement-based composite material is still up to 0.078 S / cm, and the thermoelectric properties of the cement-based composite material are significantly improved.The steps of pretreating the cement-based composite material at the temperature of 80 DEG C can realize uniform distribution of the ionic liquid in the cement base, and the Seebeck coefficient and thethermoelectric properties of the cement-based composite material are further enhanced.

Description

technical field [0001] The invention belongs to the technical field of preparation of cement-based composite materials, and in particular relates to a method for improving the thermoelectric performance of cement-based composite materials by ionic liquid. Background technique [0002] With the development of intelligent buildings, cement-based materials must not only have good mechanical properties and durability, but also have some special functional properties, such as pressure-sensitive properties, piezoelectric properties, electromagnetic shielding, thermoelectric properties, etc. Cement-based composites with thermoelectric properties have broad application prospects in the fields of alleviating the urban heat island effect in summer, energy harvesting, and melting snow and ice with low energy consumption on roads in winter. However, at present, cement-based composite materials still have problems such as low Seebeck coefficient, low electrical conductivity, low thermoel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B24/12C04B111/94
CPCC04B24/128C04B28/06C04B2111/94C04B14/386C04B14/024
Inventor 魏剑王佳敏张倩苏欢薛飞范银
Owner 西安华清科教产业(集团)有限公司
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