Macromolecular positive temperature coefficient thermosensitive resistor and manufacturing method thereof

A positive temperature coefficient, thermistor technology, applied in resistors with positive temperature coefficients, conductive materials dispersed in non-conductive inorganic materials, etc., can solve problems affecting the normal operation of electrical equipment, inconsistent resistivity changes, room temperature Wide resistance distribution and other problems, to achieve uniform resistance at room temperature, improve uniformity, and low prices

Inactive Publication Date: 2009-10-14
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the polymer PTC thermistors produced by the existing manufacturing methods have the shortcomings of wide room temperature resistance distribution and inconsist

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The polymer positive temperature coefficient thermistor core material includes the following components:

[0030]

High-density polyethylene

carbon black

Phenolic Antioxidants

ANOX20

Triallyl iso

Cyanurate

Titanate coupling agent

TCF

450g

450g

2g

2g

1g

[0031] Note: The melting point of high-density polyethylene is 130°C

[0032] The manufacturing method of the polymer positive temperature coefficient thermistor comprises the following steps:

[0033] Step 1: premix each component in a ball mill according to the formula, the ball milling speed is 270rpm, and the ball milling time is 40min to make a premix;

[0034] Step 2: Extrude the premixed material into pellets with a twin-screw extruder. The temperature of each mixing section from the inlet to the outlet of the twin-screw extruder is: 180°C, 175°C, 175°C, 175°C , 175°C, 175°C, 175°C, 175°C, 173°C, the tw...

Embodiment 2

[0038] The polymer positive temperature coefficient thermistor core material includes the following components:

[0039]

High-density polyethylene

carbon black

calcium carbonate

Phenolic Antioxidants

ANOX20

Triallyl iso

Cyanurate

Titanate coupling agent

TCF

450g

400g

50g

2g

2g

1g

[0040] Note: The melting point of high-density polyethylene is 130°C

[0041] A method for manufacturing a polymer positive temperature coefficient thermistor. The core material component of the polymer positive temperature coefficient thermistor is a polymer, a conductive filler, an inorganic filler and a processing aid. The manufacturing method includes the following steps:

[0042] Step 1: premix each component in a ball mill according to the formula, the ball milling speed is 230rpm, and the ball milling time is 60min to make a premix;

[0043] Step 2: Extrude the pr...

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PUM

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Abstract

The invention relates to a macromolecular positive temperature coefficient thermosensitive resistor which comprises a sheet core, metal foils adhering on two sides of the sheet core, and sheet or lead-shaped metal electrodes welded on outer surfaces of the metal foils; the core is blended by macromolecule polymer, conductive fillings, inorganic fillings and processing material which are distributed according to weight percentage as follows: 35-65% of macromolecule polymer, 35-65% of conductive fillings, 0-20% of inorganic fillings and 0.1-5% of processing material. The invention is characterized in that the macromolecular positive temperature coefficient thermosensitive resistor has low cost; ball grinder pre-mixing process is employed in the technique to improve evenness of room-temperature resistance value of the macromolecular positive temperature coefficient thermosensitive resistor and uniformity of resistance lift after performing current resisting, voltage resisting and the like, thereby improving rate of pass of the product.

Description

technical field [0001] The invention relates to an electronic component with high molecular polymer composite material as the main raw material, in particular to a high molecular positive temperature coefficient thermistor and a manufacturing method thereof. Background technique [0002] Crystalline or semi-crystalline polymer composites filled with conductive particles can exhibit a positive temperature coefficient (PTC) phenomenon. That is to say, within a certain temperature range, its own resistivity will increase with the increase of temperature. These crystalline or semi-crystalline polymers include polyethylene, polypropylene, polyvinylidene fluoride, etc., and their copolymers. Conductive particles include carbon black, graphite, carbon fiber, metal powder, and the like. At lower temperatures, such conductors exhibit low resistivity, which increases sharply when the temperature rises above the melting point of their polymers, the so-called "shut-off" temperature. ...

Claims

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Application Information

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IPC IPC(8): H01C7/02H01B1/20
Inventor 袁晓芳王军李从武
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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