Preparation method of PPTC (Polymeric Positive Temperature Coefficient) thermistor with high electrode peeling strength and uniform resistance distribution

A technology with high peeling strength and thermistor, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problems of long-term storage, small electrode peeling force, discrete resistance distribution, etc., to save materials, good resistance consistency, Effect of small resistance change rate

Inactive Publication Date: 2014-04-16
SHANGHAI KETER POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned problems, and propose a method for preparing a PPTC thermistor with high electrode peeling strength and uniform resistance distribution, so as to solve the problems of low electrode peeling force and oxidation resistance in PPTC thermistors in the prior art. The shortcomings of poor performance, long-term storage, discrete resistance distribution and low yield

Method used

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  • Preparation method of PPTC (Polymeric Positive Temperature Coefficient) thermistor with high electrode peeling strength and uniform resistance distribution
  • Preparation method of PPTC (Polymeric Positive Temperature Coefficient) thermistor with high electrode peeling strength and uniform resistance distribution
  • Preparation method of PPTC (Polymeric Positive Temperature Coefficient) thermistor with high electrode peeling strength and uniform resistance distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, the base material is: 4400 g of high-density polyethylene, 4000 g of carbon black, and 4200 g of magnesium hydroxide.

[0048] Concrete process step is in the present embodiment:

[0049] 1) Base material treatment: mix the base material according to the above components, then pour the base material into the mixer and mix evenly;

[0050] 2) Twin-screw extruder extrusion: After mixing in step 1), the base material is vacuum-extruded by the twin-screw extruder; the twin-screw extruder

[0051] The extrusion temperature of the rod extruder is 190-200°C;

[0052] 3) Extrusion and calendering: extruded by a single-screw extruder at 190-195°C, and then rolled on a calender to obtain a shaped sheet, which is automatically rewound by a rewinding device; a 110mm wide mushroom-shaped coarse screen is used for calendering Nickel-plated copper foil is used as an electrode, and the electrode is automatically unwound by an unwinding device with tension. The tem...

Embodiment 2

[0061] In this embodiment, the base material is: 4400 g of high-density polyethylene, 4000 g of carbon black, and 4200 g of magnesium hydroxide.

[0062] Concrete process step is in the present embodiment:

[0063] 1) Base material treatment: mix the base material according to the above components, then pour the base material into the mixer and mix evenly;

[0064] 2) Extrusion by twin-screw extruder: After mixing in step 1), the base material is vacuum-extruded by the twin-screw extruder; the extrusion temperature of the twin-screw extruder is 190-200°C;

[0065] 3) Extrusion and calendering: extruded by a single-screw extruder at 190-195°C, and then rolled on a calender to obtain a shaped sheet, which is automatically rewound by a winding device; 110mm wide dendritic nickel plating is used for calendering Copper foil is used as an electrode, and the electrode is automatically unrolled by an unwinding device with tension. The head temperature of the single-screw extruder is ...

Embodiment 3

[0074] This embodiment is a comparative test of Examples 1 and 2. Under the condition that other process conditions remain unchanged, vacuum extrusion is not used and common roughened copper foil is used as the electrode when the twin-screw extruder is extruded to obtain the final high Molecular PTC thermistor. The common roughened copper foil is selected from Shanghai Jinbao roughened copper foil with a thickness of 35um.

[0075] In this embodiment, the base material is: 4400 g of high-density polyethylene, 4000 g of carbon black, and 4200 g of magnesium hydroxide.

[0076] Concrete process step is in the present embodiment:

[0077] 1) Base material treatment: mix the base material according to the above components, then pour the base material into the mixer and mix evenly;

[0078] 2) Twin-screw extruder extrusion: the base material mixed in step 1) is extruded through a twin-screw extruder; the extrusion temperature of the twin-screw extruder is 190-200°C;

[0079] 3) ...

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Abstract

The invention discloses a preparation method of a PPTC (Polymeric Positive Temperature Coefficient) thermistor. The preparation method achieves continuous extrusion calendaring molding of the PPTC thermistor by selecting a specific technology. The preparation method provided by the invention is better in stability and high in efficiency, and the surface of a prepared macromolecule plate electrode is free from phenomena of pocking marks and bubbles; the resistance of the thermistor is good in uniformity, the electrode peeling strength is high, the inoxidizability is excellent, the resistance change rate during a durability test is small, the weather resistance is good, the product yield is higher, with the adoption of the preparation method, materials are saved, manual and energy source costs are reduced, and the preparation method has an important industrial application value.

Description

technical field [0001] The invention relates to the field of polymer thermistors, in particular to a method for preparing a PPTC thermistor with high electrode peel strength and uniform resistance distribution. technical background [0002] Polymer Positive Temperature Coefficient Thermistor (PPTC, Polymer Positive Temperature Coefficient thermistor), also known as self-recovery fuse, referred to as PPTC thermistor, PPTC thermistor is a typical temperature-sensitive resistance, exceeding a certain temperature (switch temperature), its resistance value increases stepwise with the increase of temperature. Its working principle is: when the circuit is working normally, the resistance of the PPTC thermistor is very small and does not hinder the passage of current; when the circuit has faults such as overcurrent, overload or overheating, the temperature of the thermistor rises rapidly, and when it exceeds the switch temperature, it instantly It rises to a high-impedance state, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02
Inventor 何志勇侯李明史宇正曾贤瑞
Owner SHANGHAI KETER POLYMER MATERIAL
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