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Positive temperature coefficient macromolecule composite material for temperature sensing cable and preparation method

A positive temperature coefficient and composite material technology, applied to thermometers, thermometers, and electrical devices that use directly heat-sensitive electric/magnetic elements, can solve NTC characteristic deterioration, damage, and affect the repeatability of temperature-sensing cables, etc. problem, to achieve the effect of simple processing method, high economy and application prospect, high structural stability and repeatability of PTC effect

Inactive Publication Date: 2009-04-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of temperature-sensing cable has the advantage that the sensitivity has nothing to do with the thermal length, but after repeated use of this temperature-sensing cable based on the NTC characteristics of the material, the NTC characteristics of the material will deteriorate
And if a fusible insulating layer is used, it will be destroyed after melting and stress, thus affecting the repeatability of the temperature-sensing cable

Method used

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  • Positive temperature coefficient macromolecule composite material for temperature sensing cable and preparation method

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Effect test

Embodiment 1

[0040] Embodiment 1, 100 parts by weight of ethylene-vinyl acetate, 15 parts by weight of paraffin, 15 parts by weight of furnace carbon black and 5 parts by weight of conductive carbon black are mixed in an internal mixer at 140 ° C and molded, and the mixture is formed at 70 ° C. Keep warm for 20 hours, cool to room temperature, use 60 Co-γ-ray irradiation crosslinking, irradiation dose 20kGy, temperature-resistance characteristics measurement, the room temperature resistivity is 8.9×10 3 Ω·cm, resistivity before operating temperature is 1.1×10 5 Ω cm, peak resistivity 1.5×10 9 Ω·cm.

Embodiment 2

[0041] Embodiment two, 100 parts by weight of low density polyethylene, 10 parts by weight of microcrystalline wax, 25 parts by weight of acetylene carbon black and 5 parts by weight of 2,5-dimethyl-2,5-bis(tert-butyl peroxide) Oxygen) hexane, mixed at 160°C in a twin-screw extruder, then molded, kept at 140°C for 10 hours, cooled to room temperature, and then chemically crosslinked, and the temperature-resistance characteristics were measured. The room temperature resistivity was 3.8× 10 3 Ω·cm, resistivity before operating temperature is 5.2×10 4 , with a peak resistivity of 6.6×10 9 Ω·cm.

Embodiment 3

[0042]Embodiment three, with 100 parts by weight of low-density polyethylene, 20 parts by weight of polyethylene wax, 15 parts by weight of acetylene black, 5 parts by weight of multi-walled carbon nanotubes and 0.01 parts by weight of dicumyl peroxide, After mixing in an internal mixer at 160°C, it was formed and chemically cross-linked, and the temperature-resistance characteristics were measured. The room temperature resistivity was 6.9×10 3 Ω·cm, resistivity before operating temperature is 8.2×10 4 , with a peak resistivity of 9.3×10 8 Ω·cm.

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Abstract

The invention discloses a positive temperature coefficient macromolecular composite material for temperature sensing cables and a preparation method, and relates to a resistance positive temperature coefficient macromolecular composite material for analog quantity line type temperature sensing cables and a preparation method. The preparation method is characterized by comprising the following steps: adding an assistant polymer and inorganic conductive particles into a main polymer matrix, and mixing each component in an internal mixer, an open mill or a screw extruder to be shaped; and carrying out heat treatment and chemical or radiation cross linking treatment on the materials. The prepared macromolecular composite material can meet alarm temperature grade requirement of the temperature sensing cables, has higher resistance positive temperature coefficient strength and better resistance positive temperature coefficient switching performance, meets temperature sensing alarm sensitivity requirement, and has stable structure. The analog quantity line type temperature sensing cables made of the material have the advantages of simple structure, high sensitivity, good repeatability, and the like.

Description

technical field [0001] The invention relates to a polymer composite material with positive temperature coefficient of resistance and a preparation method thereof, in particular to a polymer composite material with positive temperature coefficient of resistance used for analog measuring line temperature-sensing cables and a preparation method thereof, belonging to the preparation of polymer functional composite materials and the field of polymer processing technology. [0002] Adding inorganic conductive particles into the polymer matrix to prepare polymer composite materials with PTC (positive temperature coefficient) effect, which is used in the preparation of analog linear temperature-sensing cables, mainly involves the preparation of polymer functional composite materials and polymer processing field. Background technique [0003] At present, the analog linear temperature sensing cable is mainly based on the NTC (negative temperature coefficient) effect of polymer materi...

Claims

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Application Information

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IPC IPC(8): C08L23/00C08L23/06C08L23/08C08L23/12C08L27/16C08L27/06C08L53/02C08L75/04C08L91/08C08K3/00C08K3/04C08K3/08C08K9/02C08K5/14C08J3/24C08J3/28B29B7/82H01B3/44G01K7/16
Inventor 郭宝华徐军曹榆孙宇臣孟晓宇
Owner TSINGHUA UNIV
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