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Electric heating composite material for temperature measurement and preparation method thereof

A composite material, temperature measurement technology, applied in the direction of measuring heat, thermometers, measuring devices, etc., can solve the problems of reducing the continuity of polymer matrix materials, poor conductivity of carbon black, strength damage, etc., to achieve good conductivity, low addition amount , the effect of convenient operation

Inactive Publication Date: 2008-12-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many options for conductive fillers, the most used is carbon black, but due to the poor conductivity of carbon black, a large amount must be added to achieve a certain conductive effect, and this will reduce the continuity of the polymer matrix material and lead to its strength damage , performance drops

Method used

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  • Electric heating composite material for temperature measurement and preparation method thereof
  • Electric heating composite material for temperature measurement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 6 grams of multi-walled carbon nanotube powder and 94 grams of high-density polyethylene (molecular weight of about 80,000) particles were evenly mixed, and put into a blender for blending at 155° C. for 10 minutes. Take out the homogeneously mixed material and put it into a copper mold, preheat at 160°C for 5 minutes, and then press at 10MPa for 15 minutes. The obtained bulk composite material. The scanning electron microscopy (SEM) results of the composite material are as follows: figure 1 shown. figure 2 is the logarithm of resistivity of the composite material as a function of temperature. Depend on figure 2 It can be seen that the logarithm of the resistivity of the composite material changes linearly with the temperature below 135°C (the melting point of the polymer matrix material), and this feature of the material can be used in occasions that require temperature measurement. , the resistivity of the material decreases, and the required energy decreases, s...

Embodiment 2

[0018] 8 grams of multi-walled carbon nanotube powder and 92 grams of high-density polyethylene (molecular weight of about 80,000) particles were evenly mixed, and put into a blender for blending at 160° C. for 15 minutes. The homogeneously mixed material was taken out and put into a copper mold, preheated at 170° C. for 10 minutes, and then pressed at 20 MPa for 10 minutes to obtain a block composite material.

Embodiment 3

[0020] 9 grams of carbon nanotube powder and 91 grams of high-density polyethylene (molecular weight of about 80,000) particles were evenly mixed, and then placed in a blender for blending at 165° C. for 10 minutes. The homogeneously mixed material was taken out and put into a copper mold, preheated at 180° C. for 5 minutes, and then pressed at 30 MPa for 5 minutes to obtain a block composite material.

[0021] Tests have shown that the composite materials obtained in Examples 2 and 3 also have a relationship in which the logarithm of resistivity varies substantially linearly with temperature.

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Abstract

The invention discloses an electrical heating compound material for measuring temperature, which comprises 6~9% weight percentage multi-walled carbon nanotubes, 91~94% weight percentage high density polyethylene. The method for making the compound material comprises: weighing multi-walled carbon nanotubes powder and high density polyethylene in proportion; mixing them and placing them into a model; pre-heating 5~20 minutes in 165~180 centigrade, pressing 5~20 minutes under 5~30 MPa pressure; stripping membrane and cooling to room temperature. The inventive compound material takes high density polyethylene as base, multi-walled carbon nanotubes as additive, which make the compound material has great conductivity and electrical heating performance and be used to temperature measurement in a certain temperature range.

Description

technical field [0001] The invention relates to an electric heating composite material for temperature measurement and a preparation method thereof. Background technique [0002] Carbon nanotubes are a typical representative of new one-dimensional nanomaterials, which were discovered in the early 1990s. It is formed by rolling up graphite layers in a certain way, and can be divided into single-wall carbon nanotubes and multi-wall carbon nanotubes according to the number of layers formed. Due to the excellent electrical, mechanical and thermal properties of carbon nanotubes, they have good application prospects in many fields such as field emission, microwave absorption, electrode materials, and general polymer materials. hotspot. [0003] Polymer materials generally have the advantages of easy molding and can be used as thermal insulation and external coating materials, etc., but general polymer materials are insulating materials, which cannot be heated and maintained by e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/22G01K11/00
Inventor 刘芙张孝彬周胜名弋桂芬糜裕宏贺狄龙
Owner ZHEJIANG UNIV
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