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Positive temperature coefficient material and preparation method thereof, and material-containing thermosensitive resistor and preparation method thereof

A positive temperature coefficient and content technology, applied in thermistors and their preparation fields, can solve problems such as poor aging resistance, and achieve the effects of good stability, good PTC strength stability, and good room temperature resistance stability

Active Publication Date: 2011-01-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the room temperature resistance stability and PTC strength stability, poor resistance and poor aging resistance of the positive temperature coefficient thermistor prepared by the positive temperature coefficient material prepared by the prior art after repeated use defect

Method used

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  • Positive temperature coefficient material and preparation method thereof, and material-containing thermosensitive resistor and preparation method thereof
  • Positive temperature coefficient material and preparation method thereof, and material-containing thermosensitive resistor and preparation method thereof
  • Positive temperature coefficient material and preparation method thereof, and material-containing thermosensitive resistor and preparation method thereof

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preparation example Construction

[0031] The preparation method of the positive temperature coefficient material provided by the invention comprises:

[0032]1) weighing the titanate coupling agent, isopropanol, and antioxidant according to the ratio, stirring and mixing, and drying under vacuum conditions to obtain a titanate-modified antioxidant;

[0033] 2) Weigh titanate coupling agent, isopropanol, and flame retardant according to the proportion, stir and mix, and obtain a titanate-modified flame retardant after drying;

[0034] 3) Weigh the titanate coupling agent, isopropionic acid, and conductive filler according to the proportion, stir evenly, and obtain the titanate-modified conductive filler after drying.

[0035] 4) Mix the resin, titanate-modified conductive filler, titanate-modified lubricant, and titanate-modified flame retardant in proportion, heat and melt the mixture, and add it to the preparation in step (1) at the same time titanate-modified antioxidant, and then extrude the resulting melt...

Embodiment 1

[0066] This embodiment is used to illustrate the preparation of the positive temperature coefficient material and thermistor of the present invention.

[0067] Based on the weight of the positive temperature coefficient material, 13% polyvinyl chloride, 80% titanate modified conductive nickel powder, 1% titanate modified sodium phosphite, 1% paraffin, 5% Titanate modified calcium oxide was added to the SHR-10A high mixer of Baolai Machinery Factory, mixed at room temperature (25°C), first stirred at 800 rpm for 10 minutes, and then stirred at 2000 rpm Stir for 3 minutes at a speed of 1 / min to obtain a mixture.

[0068] The preparation process of the titanate-modified antioxidant is as follows: a) dry the antioxidant in a vacuum oven at a vacuum degree of -0.1-0.09MPa for 120-180min and grind it with a mortar for later use; b) grind the titanium Ester coupling agent NDZ-201 is diluted with organic solvents such as isopropanol or toluene, and added to the dried antioxidant in a...

Embodiment 2

[0075] This embodiment is used to illustrate the preparation of the positive temperature coefficient material and thermistor of the present invention.

[0076] This implementation adopts the same method as the embodiment to prepare the positive temperature coefficient material. The difference is that based on the weight of the positive temperature coefficient material, 10% polyvinyl chloride, 80% titanate modified conductive nickel powder, Add 0.5% titanate-modified potassium stearate, 5% stearic acid, and 4.5% titanate-modified titanium dioxide into the SHR-10A high mixer of Baolai Machinery Factory, and mix at room temperature (25°C) , first stirred at 800 rpm for 10 minutes, and then at 2000 rpm for 3 minutes to obtain a mixture.

[0077] The mixture obtained above was sent into a twin-screw compounding extruder (SJSH-30 type, Nanjing Rubber and Plastic Machinery Factory), the length-to-diameter ratio of the extruder was L:D=36:1, and the screw diameter was Ф53 mm. Adjust ...

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Abstract

The invention provides a positive temperature coefficient material and a preparation method thereof, and a material-containing thermosensitive resistor and a preparation method thereof. The material is a product formed by melting a mixture and characterized in that: the mixture contains a resin, a titanic acid ester modified conductive filler, a lubricant, a titanic acid ester modified antioxidant and a titanic acid ester modified fire retardant, wherein a three-dimensional conductive network structure is formed in the mixture by the conductive filler. The positive temperature coefficient material provided by the invention has high stability and the output power of the positive temperature coefficient material is reduced along with the increasing times of switch motions, so that the thermosensitive resistor which is prepared by the positive temperature coefficient material provided by the invention has high room temperature resistance stability and positive temperature coefficient (PTC) strength stability after being repeatedly used.

Description

technical field [0001] The present invention relates to a material, a resistance containing the material and their preparation method, in particular, a positive temperature coefficient material, a thermistor containing the material and their preparation method. Background technique [0002] Some polymer conductive composite materials have a positive temperature coefficient (PTC) effect, that is, the resistivity of the material increases with the increase of temperature, and the resistivity shows a sudden change of magnitude near the critical temperature. The application of polymer positive temperature coefficient materials has received more and more attention, but the stability of the materials needs to be further improved. The main problems that limit the application of positive temperature coefficient materials are: (1) the room temperature resistivity of positive temperature coefficient materials is unstable, and the resistivity of thermistors made of this material change...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/12C08L23/16C08L23/08C08L33/08C08L27/18C08L27/12C08L27/08C08L27/16C08L27/14C08K9/04H01C7/02
Inventor 任茂林李晓芳陈炎刘倩倩林信平
Owner BYD CO LTD
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