Thermistor core material and production technology thereof

A technology of thermistor and production process, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problem that the performance of the core material of the thermistor is difficult to meet the requirements of use, limit the development of thermistor performance, and difficult to meet the requirements of the production process and other problems, to achieve the effect of solving the problem of insufficient pressure resistance, good adhesion, and reduced external dimensions.

Inactive Publication Date: 2015-12-30
深圳市万瑞和电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current situation of over-current self-recovery protectors mainly has the following problems: the main varieties of PTC over-current self-recovery protectors for over-current and overload protection are: ceramic chip type, shell type, encapsulated type and patch type, etc.; Research in this area started late, and the technical level is backward. Regardless of whether it is at home or abroad, it has become a trend to require products to withstand voltage, flow, small size, and high power.
With the expansion of application fields, the performance requirements of polymer PTC overcurrent self-recovery protectors are getting higher and higher. In terms of GSM base stations, switching trunks, ADSL, SDH interface circuits, motors, and overcurrent protection, ordinary The pressure-resistant 250V self-resetting protector is difficult to meet the requirements of high-voltage use. It has become an urgent problem to improve the product's withstand voltage performance and increase its power. If the market demand can be utilized, organize the R&D department to solve the problem of improving the 600V withstand voltage self-resetting process. The withstand voltage problem of the current protector can not only create huge economic benefits, but also contribute to the technological progress of society
Currently producing 250V self-resetting overcurrent protector chips, it is difficult to meet the production process requirements by using ordinary flat presses, and it cannot guarantee enough pressure to make the copper foil and the black material of the chip bond firmly
The core problem is that the performance of the core material for making thermistors is difficult to meet the requirements of use, which has limited the performance of thermistors and the development of many related industries so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The ratio of raw materials used in the core material is: 19% high-density polyethylene; 19% nickel powder, nickel powder particles 1~2um; 4-hydroxyphenyl) propionate] pentaerythritol ester, molecular formula C73H108O12; flame retardant composed of 45% magnesium hydroxide; 6.7% Zinc oxide.

[0037] First, the above-mentioned raw materials are placed in a vacuum box or an oven for moisture removal pretreatment. The high-density polyethylene resin and magnesium hydroxide flame retardant materials are dried in a common oven at 90 degrees for 2 hours, and the conductive materials are first treated in a common oven at 150 degrees for 24 hours, and then all the conductive materials are put into a vacuum oven for 22 hours at 150 degrees. For pretreatment, the temperature is controlled at 80~150°C. Here, the temperature range is: 130°C, and the vacuum degree is -0.05MPa. Vacuum pretreatment time is 46h;

[0038] Then put the above-mentioned raw materials that have been pretre...

Embodiment 2

[0040] The ratio of raw materials used in the core material is: 30% high-density polyethylene; 19.5% nickel powder, the particle size of nickel powder is 1~2um, and the purity is electronic grade; 0.3% antioxidant 1010 is four [β-(3,5-di tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, molecular formula C73H108O12; flame retardant composed of 46% magnesium hydroxide; 4.2% Calcium stearate.

[0041] First, the above-mentioned raw materials are placed in a vacuum box or an oven for moisture removal pretreatment. The high-density polyethylene resin and magnesium hydroxide flame retardant materials are dried in an ordinary oven at 100 degrees for 2 hours. The main purpose here is to remove the moisture in the raw materials, and the time can be adjusted appropriately. The conductive material is first treated in an ordinary oven at 150°C for 24 hours to remove moisture, and then the conductive material is pretreated in a vacuum oven at 180°C with a vacuum degree of 0....

Embodiment 3

[0044] The ratio of raw materials used in the core material is: 31% high-density polyethylene; 20% carbon nanotubes. The technical parameters of the carbon nanotubes used are 12um in length, 10nm in diameter, and a surface area of ​​≥230m 2 / g, bulk density 0.05g / cm 3 ; 0.4% antioxidant 1010, tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, molecular formula C73H108O12; 46% flame retardant composed of magnesium hydroxide; 2.6% Calcium stearate.

[0045] First, the above-mentioned raw materials are placed in a vacuum box or an oven for moisture removal pretreatment. The high-density polyethylene resin and magnesium hydroxide flame retardant materials are dried in an ordinary oven at 95 degrees for 2 hours. The main purpose here is to remove the moisture in the raw materials, and the time can be adjusted appropriately. The conductive material is first treated in an ordinary oven at 150 degrees for 24 hours to remove moisture. Here, all the con...

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PUM

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Abstract

The invention relates to the field of manufacturing materials of electron components, in particular to a kernel material of a novel voltage-withstanding overcurrent self-recovery protector, namely a core material manufacturing material, and the voltage-withstanding capacity can reach 600 V. The voltage-withstanding overcurrent self-recovery protector is composed of a core material arranged between two metal membranes, the metal membranes are provided with leading-out electrodes, and the outer layers of the metal membranes are enveloped with insulating and sealing materials. The core material is prepared from, by weight, high-density polyethylene, a conducting material, antioxidant 1010 and fire retardant prepared from magnesium hydrate. A novel thermistor kernel manufacturing material with good adhesive performance and the more remarkable jump performance can be provided, a thermistor has a positive temperature coefficient effect, the room temperature specific resistance is 10-2 Omega.cm, the PTC strength is larger than 107 orders of magnitude, and meanwhile a material manufacturing method is provided.

Description

technical field [0001] The invention relates to the field of materials for making electronic components, in particular to a core material of a new type of overcurrent self-recovery protector with a withstand voltage of up to 600V, that is, a material for making core materials. Background technique [0002] The market prospect of PPTC overcurrent self-recovery protectors in the protection of circuit devices is very broad. The application fields of products include home appliances, motors, communications, security, toys, etc. Among them, the fields of communications and motors are the largest and most cutting-edge markets. PPTC overcurrent self-recovery protector protection components put forward higher requirements to prevent communications and motors from burning accidents easily under high pressure, high temperature or high current or short circuit conditions. Therefore, this project product is used to provide circuit overcurrent protection for it. Guaranteeing the smooth o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02
Inventor 国凤飞尹晓军李斌
Owner 深圳市万瑞和电子有限公司
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