Conductive composite material for improving switching temperature of PTC (positive temperature coefficient) thermal element and manufacturing method thereof

A technology of conductive composite materials and heat-sensitive elements, which is applied in the direction of conductive materials dispersed in non-conductive inorganic materials, resistors with positive temperature coefficients, etc., can solve the problem of PTC heat-sensitive elements not being able to maintain, and avoid structural Design, the effect of increasing the switching temperature

Inactive Publication Date: 2011-07-27
SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a conductive composite material for increasing the switching temperature of the PTC thermal element, which can solve the problem that the PTC thermal element cannot be maintained in actual production

Method used

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  • Conductive composite material for improving switching temperature of PTC (positive temperature coefficient) thermal element and manufacturing method thereof
  • Conductive composite material for improving switching temperature of PTC (positive temperature coefficient) thermal element and manufacturing method thereof

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Embodiment

[0021] A kind of conductive compound material that is used to improve the switch temperature of PTC thermosensitive element, is the compound material of polyolefin / carbon black, comprises by weight:

[0022] High-density polyethylene 48 parts

[0023] 52 parts of carbon black.

[0024] Among them, the high-density polyethylene has a crystallinity of not less than 70% and a density of not less than 0.94g / cm 3 ; The carbon black is lamp smoke black with large particle size and good conductivity, the particle size is 80-100nm, and the DBP oil absorption value is not less than 65ml / 100g.

[0025] The preparation method is as follows: mix the high-density polyethylene and carbon black in the internal mixer at a temperature of about 175°C at a low speed, the speed is 20 rpm, and the mixing time is 15 minutes. After hot pressing, the thickness is 0.30-0.32 mm sheet, irradiated once under the condition of a dose of 16Mrad to make a conductive composite material.

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Abstract

The invention relates to a conductive composite material for improving the switching temperature of a PTC (positive temperature coefficient) thermal element and a manufacturing method thereof. In the method, the composite material is a polyolefin/carbon black composite material. The conductive composite material comprises the following components in parts by weight: 45-50 parts of high-density polyolefin with crystallinity not lower than 70% and density not lower than 0.94g/cm<3>, and 50-55 parts of lamp carbon black with the large grain size of 80-100nm, DBP (dibutyl phthalate) oil absorption value not lower than 65ml/100h and good electrical conductivity. The preparation method comprises the following steps: carrying out low-speed banburying on the polyolefin and carbon back in a formula amount at 170-180 DEG C for 10-20 minutes and preparing the materials into sheets of 0.30-0.32mm by hot pressing; and then carrying out irradiation once under the condition that the dosage is 5-25Mrad to prepare the conductive composite material at the rotation speed of 10-30 revolutions/min. The preparation method of the composite material has the advantages that high-crystallinity and high-density polyolefin is selected, the fusing temperature of the PTC conductive composite material is adjusted, and the process is controlled, so that the switching temperature of the polyolefin/carbon black composite material is improved from 94 DEG C to 103 DEG C, and the problems that the PTC element can not be maintained and the structure design of the PTC element is complicated can be avoided.

Description

technical field [0001] The invention relates to a core material of a PTC thermosensitive element, which belongs to the field of polymer processing, in particular to a conductive composite material and a preparation method for increasing the switching temperature of a PTC thermosensitive element. Background technique [0002] Positive temperature coefficient (PTC) polymer composites or polymer materials are currently one of the more popular intelligent polymer materials researched and developed at home and abroad, and have been found to be widely used as PTC resettable fuses in many electrical and electronic appliances. The main function of PTC devices comprising these polymer composites is to prevent overloading and / or overheating of electronic circuits. The reason why the PTC device has this function is that the characteristic of the PTC polymer composite material is that the resistance of the polymer composite material will suddenly increase with a relatively small increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K3/04H01B1/24B29C43/00B29B7/28H01C7/02
Inventor 王炜刘正平刘玉堂王军
Owner SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO LTD
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