Negative temperature coefficient polymer composite material for temperature sensing cable and preparation method

A negative temperature coefficient and composite material technology, which is applied in the field of negative temperature coefficient of resistance polymer composite materials and preparation, and the preparation of polymer functional composite materials, can solve the problems of poor repeatability, non-reusable, insensitive alarm, etc. Small, reproducible and sensitive results

Inactive Publication Date: 2010-02-24
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of temperature-sensing cable has the advantages of being less affected by the ambient temperature and sensitive to the alarm, but the repeatability is poor or basically not reusable
Traditional polymer composites with negative temperature coefficient of resistance often have a large cha

Method used

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  • Negative temperature coefficient polymer composite material for temperature sensing cable and preparation method
  • Negative temperature coefficient polymer composite material for temperature sensing cable and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1. 100 parts by weight of natural rubber, 5 parts by weight of ethylene-vinyl acetate copolymer, 10 parts by weight of acetylene carbon black, 1 part by weight of sulfur, and 3 parts by weight of paraffin are compounded in an open mill at 170 ° C and then formed , kept at 70°C for 20 hours, cooled to room temperature, and then chemically cross-linked to measure the temperature-resistance characteristics. The room temperature resistivity was 9.1×10 8 Ω·cm, resistivity before operating temperature is 8.7×10 8 Ω·cm, the resistivity after operating temperature is 2.7×10 7 Ω·cm.

[0073] Embodiment two, 100 parts of ethylene-propylene rubber, 10 parts by weight of polyethylene wax, 8 parts by weight of conductive carbon black, 5 parts by weight of 2,5-dimethyl-2,5-two (tert-butyl peroxy) hexane , formed after compounding in a twin-screw extruder at 90°C, kept at 80°C for 30 hours, cooled to room temperature, and then chemically cross-linked to measure the temper...

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Abstract

The invention relates to a negative temperature coefficient polymer composite material for temperature sensing cables and a preparation method, belonging to the field of the preparation of macromolecule functional composite material and process technology of polymers; the invention has the characteristics that: rubber or thermoplastic elastomers are combined with different auxiliary polymers, conducting particles are added to prepare the macromolecule composite material with the characteristic of negative temperature coefficient. The material has the characteristics that the resistance changeis low below the room temperature and operating temperature, and then is rapidly reduced after reaching the operating temperature, and overcomes the disadvantages that the traditional NTC macromolecule composite material has obvious resistance change below the room temperature and the operating temperature, and the resistance change is low close to the operating temperature, so as to lead the prepared temperature sensing cables to have high sensitivity, to have little effect to environment temperature and good repetitiveness.

Description

technical field [0001] The invention relates to a negative temperature coefficient of resistance polymer composite material and a preparation method thereof, in particular to a negative temperature coefficient of resistance (NTC) polymer composite material and a preparation method thereof for analog measuring line type temperature-sensing cables, belonging to polymer function Composite material preparation and polymer processing technology field. [0002] Add conductive particles to the polymer matrix to prepare polymer composite materials with NTC (negative temperature coefficient) effect, and use them in the preparation of analog linear temperature-sensing cables, mainly involving the preparation of polymer functional composite materials and polymer processing fields . Background technique [0003] At present, analog linear temperature-sensing cables are mainly prepared based on NTC polymer composite materials. Such temperature-sensing cables generally have two types of ...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L23/08C08L23/16C08L23/06C08L9/06C08L11/00C08L23/22C08L9/02C08L23/12C08L53/02C08L27/16C08L23/00C08K3/04C08K5/14C08K3/22C08J3/24C08J3/28H01C7/04
Inventor 郭宝华徐军曹榆孙宇臣孟晓宇
Owner TSINGHUA UNIV
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