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A layered polymer matrix PTC material and preparation method

A technology of polymers and matrix polymers, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, plastic/resin/wax insulators, organic insulators, etc., can solve the problem that the shape structure is difficult to be designed, and it is difficult to obtain high PTC Intensity and other issues, to achieve the effect that is beneficial to the strength of PTC, the equipment is simple and easy to obtain, and the production cost is low

Active Publication Date: 2008-07-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a new polymer-based PTC material and its preparation method for the current situation of preparing polymer-based PTC materials, so as to solve the problem that the polymer-based PTC materials in the prior art are difficult to obtain high PTC strength and difficult to have a morphological structure. Designability and other technical issues

Method used

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  • A layered polymer matrix PTC material and preparation method

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Embodiment 1

[0029] The raw materials are polypropylene and carbon black, the insulating layer and the conductive layer are pure polypropylene and carbon black filled polypropylene respectively. Firstly, ordinary carbon black-filled polypropylene was prepared, and the carbon black content was 11%. After the polypropylene and carbon black were dried, they were melt-mixed and granulated in a twin-screw extruder. The conductive layer and insulating layer pellets are put into the two extruders A and B of the layered co-extrusion device respectively, the speed ratio of the extruders is 2:1, and the temperature of each section of the extruder is controlled between 170-200°C. The temperatures of converging unit C, splitting unit D and outlet die E are all about 200°C. Using one splitting unit, the PTC material product melt flows out of the exit die under the traction of the traction device, and after being cooled by the cooling device, that is A 4-layer layered polypropylene-based PTC material wa...

Embodiment 2

[0031]The raw materials are polypropylene and carbon black, the insulating layer and the conductive layer are pure polypropylene and carbon black filled polypropylene respectively. Firstly, ordinary carbon black-filled polypropylene was prepared with a carbon black content of 8.5%. After the polypropylene and carbon black were dried, they were melt-mixed and granulated in a twin-screw extruder. The conductive layer and the insulating layer pellets are respectively put into two extruders A and B of the layered co-extrusion device, the speed ratio of the extruders is 1:1, and the temperature of each section of the extruder is controlled between 170-200°C. The temperatures of converging unit C, splitting unit D and outlet die E are all about 200°C. Using two splitting units, the PTC material product melt flows out of the exit die under the traction of the traction device, and after being cooled by the cooling device, that is An 8-layer layered polypropylene-based PTC material was...

Embodiment 3

[0033] The raw materials are polypropylene and carbon black, the insulating layer and the conductive layer are pure polypropylene and carbon black filled polypropylene respectively. First, ordinary carbon black-filled polypropylene was prepared, with a carbon black content of 5.2%. After the polypropylene and carbon black were dried, they were melt-mixed and granulated in a twin-screw extruder. The conductive layer and the insulating layer pellets are respectively put into two extruders A and B of the layered co-extrusion device, the speed ratio of the extruders is 1:1, and the temperature of each section of the extruder is controlled between 170-200°C. The temperatures of converging unit C, splitting unit D and outlet die E are all about 200°C. Using one splitting unit, the PTC material product melt flows out of the exit die under the traction of the traction device, and after being cooled by the cooling device, that is A two-layer layered polypropylene-based PTC material was...

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Abstract

The invention discloses a layered polymer-based PTC material and the preparation method. The structure of the PTC material is composed of at least one layer of polymer insulation layer and at least one layer of conductive layer which takes carbon black as the conductive substance and takes the polymer as the base by alternate overlapping. The preparation method is that, the materials of the insulation layer and the conductive layer are respectively put into two extruders of a micro-layer coextrusion device for melting and plasticizing, two streams of melting bodies are overlapped into two layers at a convergence device, and 2<N PLUS 1> layers of compound PTC materials are obtained by cutting and overlapping via n cutting and overlapping units. The number of the layers of the PTC materials and the layer thickness ratio of the conductive layer and the insulation layer of the invention are respectively decided by the number of the cutting and overlapping units and the rotation speed of the extruders, the structure and the performances have designability; compared with the PTC materials which are prepared by the traditional preparation method, the invention has high PTC intensity and high breaking elongation rate. The equipment, which is related to by the invention, is simple and easy to obtain, the needed raw materials are sold on the market, the invention does not need other synthetic chemicals, the operation is simple, the production cost is low and the efficiency is high.

Description

1. Technical field [0001] The invention relates to the technical field of polymer PTC materials, more specifically, the invention relates to a polymer / carbon black PTC material and a preparation method thereof. 2. Background technology [0002] PTC (resistor) material is a kind of thermistor material with positive temperature coefficient. At a certain transition temperature, its resistivity increases rapidly to a limit value, and a (semi)conductor-insulator mutual transition occurs, so it can be used in Prepare self-limiting temperature heaters, overcurrent protection components and other temperature sensing devices. In general, PTC materials are divided into two types: ceramic-based and polymer-based. The further application of ceramic-based PTC materials is limited due to brittleness, difficulty in processing and high cost. Polymer-based composite PTC materials are more and more widely used because of their adjustable electrical conductivity in a wide range, easy molding...

Claims

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Application Information

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IPC IPC(8): H01B1/24H01B3/44H01B3/42H01C7/02B29C47/06
Inventor 李姜许双喜郭少云文明张玉清蒋松龄
Owner SICHUAN UNIV
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