A kind of modified PTC conductive composite material and its preparation and application

A technology of conductive composite materials and conductive fillers, applied in circuits, resistors, electrical components, etc., can solve the problems of poor adhesion, poor resistance reproducibility, and inability to effectively reduce the overall resistance value, etc., to achieve increased surface area, low resistivity, The effect of excellent resistance stability

Active Publication Date: 2016-08-24
上海神沃电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Oxygen-free ceramic powder does not have a concave-convex surface like carbon black, and its adhesion to polymers such as polyolefins is worse than that of carbon black, and its resistance reproducibility is poor
In order to increase the adhesion between polymers such as polyhydrocarbons and ceramic powders, conventional conductive composite materials using ceramic powders as conductive fillers will add a coupling agent, such as anhydride compounds or silane compounds, to strengthen polyolefin polymers. Adhesion with ceramic powder, however, the overall resistance cannot be effectively reduced after adding a coupling agent

Method used

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  • A kind of modified PTC conductive composite material and its preparation and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The raw material components of the modified PTC conductive composite material are:

[0043] Based on the total volume of the modified PTC conductive composite material, the volume percentage of the crystalline polyolefin polymer substrate and the conductive filler is:

[0044] Crystalline polyolefin polymer substrate 30%;

[0045] Conductive filler 70%;

[0046] In addition, the raw material component of the modified PTC conductive composite material also contains 0.5% peroxide crosslinking agent whose volume fraction is the volume fraction of the conductive filler.

[0047] The crystalline polyolefin polymer substrate is a high-density polyethylene with a melting temperature of 132° C. and a density of 0.936 g / cm 3 .

[0048] The conductive filler is acid-treated titanium carbide. The particle size of the titanium carbide is less than 5um, and the volume resistivity is 35uΩ.cm. The acid treatment process of titanium carbide is as follows: titanium carbide is added...

Embodiment 2

[0055] The concentration of acid used in this embodiment is 0.5wt%, and other steps and parameters are the same as in Example 1.

[0056] The electrical characteristics of the PTC over-current and over-temperature protection element of this embodiment are shown in Table 1.

Embodiment 3

[0058] The concentration of acid used in this embodiment is 1 wt%, and other steps and parameters are the same as in embodiment 1.

[0059] The electrical characteristics of the PTC over-current and over-temperature protection element of this embodiment are shown in Table 1.

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Abstract

The invention discloses a modified PTC conductive composite material. The modified PTC conductive composite material is prepared from the following raw materials: a crystalline polyolefin polymer substrate and a conductive filler, wherein the conductive filler is dispersed in the crystalline polyolefin polymer substrate, and the conductive filler is treated by using an acidic solution previously; based on the total volume of the modified PTC conductive composite material, the percent by volume of the crystalline polyolefin polymer substrate is 30% to 60%, while the percent by volume of the conductive filler is 40% to 70%. The modified PTC conductive composite material is good in electrical conductivity and excellent in weather fastness; an over-current / over-temperature protection PTC thermosensitive element prepared from the conductive composite material is low in electrical resistivity, high in strength, good in resistance reproducibility and excellent in resistive stability.

Description

technical field [0001] The invention relates to the field of polymer conductive composite materials, in particular to a polymer conductive composite material used in a PTC overcurrent and overtemperature protection element. Background technique [0002] Polymer positive temperature coefficient thermistor, that is, PTC thermistor, as a self-recovery fuse, is widely used in the field of over-temperature and over-current protection of electronic circuits. With the increase of mobile phone battery capacity, PTC overcurrent protection components with low resistance and small size have become best-selling products in the market. [0003] At present, positive temperature coefficient conductive composite materials are composed of one or more crystalline polymers and conductive fillers. The polymer is generally a polyolefin polymer, such as polyethylene, polyethylene graft polymer, polyvinylidene fluoride and copolyester, etc. The conductive filler is generally carbon black, metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/00C08L23/06C08L23/08C08K9/02C08K3/28C08K3/14B29C47/92H01C7/02B29C48/92
CPCB29C48/92B29C2948/92704C08K3/14C08K5/14C08K9/02C08K2201/001C08K2201/003C08L2203/20C08L2207/062H01C7/022H01C7/027C08L23/06B29C48/385B29C48/397B29C48/40B29C2948/92266B29C2948/92485B29C2948/92561B29C2948/9259B29C2948/92609B29C2948/92657B29C2948/92685B29C2948/92828B29C2948/92885B29C2948/92895
Inventor 张爱丽侯李明唐佳林曾贤瑞李庆北史宇正
Owner 上海神沃电子有限公司
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