Polyethylene/titanium diboride PTC (Positive Temperature Coefficient) composite material and preparation method thereof

A technology of titanium diboride and composite materials, 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

Inactive Publication Date: 2012-10-03
HEFEI UNIV OF TECH
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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

[0035] Example 1, TiB 2 It forms a network in the material and plays a conductive role. Thanks to TiB 2 The proportion is small, the CB content is zero, the conductivity of the material at room temperature is limited, and the PTC strength is low. However, due to the high proportion of organic components (HDPE / LDPE), the material has good plasticity and toughness, good formability and stable mechanical properties.

Embodiment 2

[0036] Example 2, TiB 2 The amount increased by 24.7% compared with the first group, due to TiB 2 If the amount is large, the plasticity and toughness of the PTC material will decrease, and the cracking tendency will increase during preparation. But TiB 2 The amount is large, the conductive network is more complete than the first group, the material conductivity is better than the first group, the PTC has high strength, and the PTC has good stability.

Embodiment 3

[0037] In Example 3, the weight percentage of LDPE was increased by 50% compared with the second group. LDPE has low crystallinity, while TiB 2 The particles are distributed in the amorphous phase, and the proportion of LDPE in the PTC composite is increased, which is favorable for TiB 2 The particles are evenly distributed, which can effectively improve the conductivity and PTC strength.

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PUM

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Abstract

The invention discloses a polyethylene/titanium diboride PTC (Positive Temperature Coefficient) composite material and a preparation method thereof. The polyethylene/titanium diboride PTC composite material is prepared from the raw materials consisting of main materials and processing auxiliary agents, wherein the main materials comprise the following components in percentage by mass: 10-25 percent of low density polyethylene, 40.1-50 percent of TiB2, 0-6 percent of CB and the balance of high density polyethylene; and the processing auxiliary materials comprise antioxidant 1010, stearic acid, a coupling agent of vinyl trimethoxy silane, antimony trioxide and a fire retardant of decabromodiphenylethane. The polyethylene/titanium diboride PTC composite material has low room temperature resistivity, high voltage resistance, heavy current resistance, long-term flow stability performance, high PTC strength and high PTC stability.

Description

1. Technical field [0001] The invention relates to a polyethylene / titanium diboride PTC thermosensitive conductive composite material and a manufacturing method thereof. 2. Background technology [0002] The organic positive temperature coefficient (PTC) conductive material composed of conductive additives and polymers is one of the rapidly developing 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 characteristics, small current protection capabilities, and high-pulse ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06H01B1/24C08K13/02C08K3/38C08K3/22C08K3/04C08K5/03C08J7/00B29C43/58
Inventor 杜晓东王建峰王金甲高振
Owner HEFEI UNIV OF TECH
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