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Composite material with negative temperature coefficient, preparation process and application thereof

A temperature coefficient, composite material technology, used in thermometers, thermometers with electrical/magnetic components directly sensitive to heat, electrical devices, etc., can solve the application of softness requirements, unsuitable, high hardness, inconvenient processing and use and other problems, to achieve the effect of obvious NTC characteristics, easy processing and use

Active Publication Date: 2009-04-22
SHANGHAI ELECTRIC CABLE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, alloys or metal oxides with negative temperature coefficients of resistance have high hardness, are inconvenient to process and use, and are not suitable for the monitoring of large-area temperature fields and occasions that require softness.

Method used

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  • Composite material with negative temperature coefficient, preparation process and application thereof
  • Composite material with negative temperature coefficient, preparation process and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The polyethylene that is 80% by mass is extruded through a twin-screw extruder, and 7% of high-conductivity carbon black, 10% of calcium carbonate, 3% of antioxidant 1010 and EVA are added during the extrusion process. The NTC material can be obtained by pelletizing. Its volume resistivity is 10 at 20°C 9 Ω·m, 10 at 100°C 6 Ω·m, then the value of B is 9445K, and the temperature coefficient of resistance at 20°C is -0.110°C -1 .

Embodiment 2

[0021] The mass percentage is 75% of polyvinyl chloride and its plasticizer DOP, 10% of zinc oxide, 10% of talcum powder, calcium zinc stabilizer and stearic acid and a total of 5% of the formula components are mixed evenly with a high-speed mixer Finally, the NTC material can be obtained by extruding and granulating with a single-screw extruder. Its volume resistivity is 3.5×10 at 20°C 12 Ω·m, 1.2×10 at 100°C 9 Ω·m, then the value of B is 10909K, and the temperature coefficient of resistance at 20°C is -0.127°C -1 .

Embodiment 3

[0023] The polyethylene that is 60% by mass is extruded through a twin-screw extruder, adding 20% ​​of high-conductivity carbon black, 19% of talcum powder, 1% of antioxidant 300 and EVA in the extrusion process, at the die head The NTC material can be obtained by pelletizing. Its volume resistivity is 10 at 20°C 7 Ω·m, then the B value is 9122K.

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Abstract

The present invention relates to a composite material with negative resistance temperature coefficient, its preparation and application. Its composition nicludes (by mass%) 60%-80% of base body polymer, 5%-20% of electroconductive filler, 10%-20% of non-conductive filler and 1%-5% of adjuvant, in which the base body polymer is thermoplastic high-molecular material whose melting temp. is 100 deg.C-150 deg.C. Its preparation method is simple, all the above-mentioned raw materials are mixed, extruded and granulated, so as to obtain the invented product. Besides, said invention also provides its application range.

Description

technical field [0001] The invention relates to a composite material with a negative temperature coefficient of resistance, a preparation method and application fields thereof. Background technique [0002] The existing negative temperature coefficient of resistance materials are generally alloys or metal oxides, the B value is generally 2000K to 5000K, and the temperature coefficient of resistance at 20°C is -0.023°C to -0.058°C, which can be applied to surge protectors, point temperature detectors etc. For example, the invention patent 87101848A ("Linear Negative Temperature Coefficient Thermosensitive Material") relates to a linear negative temperature coefficient thermosensitive ceramic, which needs to be sintered at 1200°C-1400°C for 1-6 hours to make a small disc shape. Generally speaking, alloys or metal oxides with negative temperature coefficient of resistance have high hardness, which are inconvenient to process and use, and are not suitable for monitoring large-a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L27/06C08K3/22C08K3/04G01K7/00
Inventor 刘旌平严永昌
Owner SHANGHAI ELECTRIC CABLE RES INST