Polyvinyl PTC thermo-sensitive conductive composite material and manufacturing method thereof

A conductive composite material, polyethylene-based technology, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of superior overcurrent protection performance, difficult processing and forming, and high price, and achieve low room temperature resistance rate, improve electrical conductivity, and enhance the effect of current resistance

Inactive Publication Date: 2010-10-27
合肥上雅电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ceramic-based PTC materials have better performance in terms of operating characteristics, small current protection capability, and high-pulse high-current impact resistance. However, due to the high room temperature resistance of ceramic-based PTC materials, the resistance increases with temperature in the temperature range above the Curie point. Relatively slow, there is no resistance mutation process similar to a fuse, so its overall overcurrent protection performance is not as superior as polymer-based PTC materials
In addition, ceramic-based PTC materials are brittle, difficult to process and form, and expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Crystalline high-density polyethylene (HDPE, crystallinity over 90%, melting point 130°C), linear low-density polyethylene (LDPE, melting point 110°C) and conductive titanium diboride powder are used as the polymer matrix. (TiB 2 , Resistivity: 14.4μΩ·cm) according to the proportion (mass ratio) of 4:2:4 and mix, add according to 0.1%, 2.0%, 1.0%, 3.0%, 8.0% of the organic component mass in the base material respectively Antioxidant, stearic acid, vinyltrimethoxysilane coupling agent, antimony trioxide flame retardant, and decabromodiphenylethane flame retardant were mixed on a double-roller mixer at 180°C for 30 minutes, to obtain a kneaded product.

[0021] The obtained kneaded material was added to a self-made mold with a diameter of 18 mm foil electrodes, and molded with a hot press set at 160 ° C and 10 MPa to obtain a 22 mm diameter and a thickness of 500 μm containing electrodes. Disc-shaped PTC chip. Then the composite sheet was treated with gamma rays (Co 6...

Embodiment 2

[0024] Crystalline high-density polyethylene (HDPE, crystallinity over 90%, melting point 130°C), linear low-density polyethylene (LDPE, melting point 110°C) and conductive titanium diboride powder are used as the polymer matrix. (TiB 2 , Resistivity: 14.4μΩ·cm) and carbon black (CB) according to the ratio (mass ratio) of 50:20:27:3 ingredients. According to 0.1%, 2.0%, 1.0%, 3.0%, and 8.0% of the mass of organic components, antioxidants, stearic acid, vinyltrimethoxysilane coupling agents, antimony trioxide flame retardants, decabromo Diphenylethane flame retardant, first TiB 2 Mix with CB for 2 hours at normal temperature and pressure, and then knead with other components on a twin-roll mixer at 180°C for 30 minutes to obtain a kneaded product.

[0025] The obtained kneaded material was added to a self-made mold with a diameter of 18 mm foil electrodes, and molded with a hot press set at 160 ° C and 10 MPa to obtain a 22 mm diameter and a thickness of 500 μm containing ele...

Embodiment 3

[0028] By weight percentage, the composition of the composite material is (mass percentage): 50% HDPE, 20% LDPE, 24% TiB2, 6.0% CB, and the auxiliary agent addition is (the auxiliary agent occupies organic matter component mass percentage): 0.2% Antioxidant, 2.0% stearic acid, 1.5% vinyltrimethoxysilane coupling agent, 3.0% antimony trioxide, 10% decabromodiphenylethane. First, TiB2 and CB were mixed for 2 hours at normal temperature and pressure, and then mixed together with other components on a twin-roll mixer at 180° C. for 30 minutes to obtain a mixed product.

[0029] The obtained kneaded material was added to a self-made mold with a diameter of 18 mm foil electrodes, and molded with a hot press set at 160 ° C and 10 MPa to obtain a 22 mm diameter and a thickness of 500 μm containing electrodes. Disc-shaped PTC chip. Then the composite sheet is cross-linked with γ-ray (Co60) radiation, the dosage is 120KGy. Next, copper wires with a diameter of 0.2 mm were soldered to ...

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Abstract

The invention relates to a polyvinyl PTC thermo-sensitive conductive composite material, which comprises a base material and an additive, wherein the base material comprises 10-25% of LDPE, 20-40% of TiB2, 0-8% of CB and the balance of HDPE, and the additive comprises 0.1-0.3% of antioxidant1010, 1-3% of stearic acid, 1-2% vinyl trimethoxysilane, 3-5% of Sb2O3 and 8-12% of decabromodiphenyl ethane; and the adding amount of the additive is measured by the mass of organic matter components in the base material. The material has room temperature resistivity of 23.5omega . cm, long-term current capacity flow of greater than 100A and PTC intensity of 7.8, and resistance keeps stable after 100 thermal cycles.

Description

1. Technical field [0001] The invention relates to a polymer-based PTC material and a preparation method thereof, specifically a polyethylene-based PTC heat-sensitive conductive composite material and a manufacturing method thereof 2. Background technology [0002] Organic positive temperature coefficient (PTC) conductive materials composed of conductive additives and polymers are one of the fastest-growing functional polymer materials. PTC materials are widely used in communications, computers, automobiles, industrial control, household appliances and many other fields as overheating, overcurrent protection and self-controlling heating materials. The current organic PTC materials mainly use graphite and carbon black as conductive fillers, which have a wide distribution of room temperature resistance, low PTC strength, low heat resistance and stability, and low yield during preparation. Ceramic-based PTC materials have better performance in terms of operating characteristic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K13/02C08K3/38C08K3/04C08K5/09C08K5/5425C08K3/22C08K5/03H01B1/20H01B1/24B29C43/58B29C71/04
Inventor 杜怡林杜晓东袁霞
Owner 合肥上雅电子科技有限公司
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