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Method for promoting high-density polyethylene /carbon ink composite material positive temperature coefficient property

A high-density polyethylene, positive temperature coefficient technology, applied in the direction of chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problems of high cost, high environmental atmosphere requirements, high PTC strength, etc., to achieve cost Low cost, no pollution to the environment, and simple process

Inactive Publication Date: 2007-05-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many companies abroad, such as Raychem in the United States and Fujichang Electric Wire Co., Ltd. in Japan, which can produce self-recovery fuses and self-controlling heating cables with good quality. Due to the late start of theoretical research in China, and foreign companies' research on material preparation The process is strictly kept secret, so the scale of domestic industrial production is small, the variety of products is scarce, and the quality is poor
[0003] At present, the biggest problem of polymer PTC materials is that the stability of PTC effect is poor during repeated thermal cycles, and it is difficult to obtain low room temperature resistivity and high PTC strength at the same time.
Irradiation crosslinking of materials can solve the above problems to a certain extent, but the cost is high, the requirements for ambient atmosphere are high, and the uniformity of crosslinking for thick samples is poor
US5164133, US4514620, CN1343560, CN1188779, CN1363629, etc. have all disclosed methods for improving the performance of polymer PTC materials, which have improved the PTC strength of the material and the stability of the PTC effect to a certain extent, but the manufacturing processes of these methods are all relatively complicated. And the PTC strength of the obtained materials is not very high

Method used

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  • Method for promoting high-density polyethylene /carbon ink composite material positive temperature coefficient property
  • Method for promoting high-density polyethylene /carbon ink composite material positive temperature coefficient property
  • Method for promoting high-density polyethylene /carbon ink composite material positive temperature coefficient property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The HDPE powder was irradiated with a dose rate of 1kGy / h and a dose of 5kGy to obtain γ-HDPE, then take 100g of γ-HDPE, 36g of untreated CB, 0.3g of antioxidant 1010 and antioxidant 168, Put it into an open mixer for mixing, the mixing temperature is 150-160°C, and the mixing time is 10-15min. The obtained compound is compression molded into a 2mm thick sheet with a flat vulcanizer, and the molding temperature is 175-185 °C, the molding pressure is 10-15MPa, and then the surface of the prepared sheet is heated to 140-160 °C to press into the copper electrode sheet.

Embodiment 2

[0024] Example 2: HDPE is irradiated with a dose rate of 0.1kGy / h and a dose of 10kGy to obtain γ-HDPE, then take 100g of γ-HDPE, 40g of untreated CB, 0.5g of antioxidant 1010 and antioxidant 168 are added to Mixing is carried out in an open mill, the mixing temperature is 150-160°C, and the mixing time is 10-15min. The obtained compound is compression molded into a 2mm thick sheet with a flat vulcanizer, and the molding temperature is 175-185°C. The molding pressure is 10-15MPa, and then the surface of the prepared sheet is heated to 140-160°C and pressed into the copper electrode sheet.

Embodiment 3

[0025] Example 3: The HDPE powder was irradiated with a dose rate of 1kGy / h and a dose of 5kGy to obtain γ-HDPE, and the carbon black was placed in an ozone reactor and treated for 30min at 60°C with an ozone concentration of 11mg / L to obtain o -CB, then take 100g of γ-HDPE, 42g of o-CB, 0.5g of antioxidant 1010 and antioxidant 168, and add them to the open mixer for mixing. The mixing temperature is 150-160°C, and the mixing time is 10-15min, the obtained compound is compression molded into a 2mm thick sheet with a flat vulcanizer, the molding temperature is 175-185°C, the molding pressure is 10-15MPa, and then the surface of the obtained sheet is heated to 140-160 Press into the copper electrode sheet at ℃.

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Abstract

The invention discloses a method for promoting high-density polyethylene / carbon ink composite material positive temperature coefficient property, which comprises, (1) radiating the high-density polyethylene powder in air under room temperature, the irradiation dosage rate is 0.1-1kGy / h, the dosage is 5-30kGy, (2) oxidizing the carbon black 10-120 minutes with ozone under the condition of 60-95 deg. C of temperature and 11-55mg / L of ozone concentration, (3) charging 100 weight parts of radiated high-density polyethylene, 25-60 weight parts of ozone treated carbon black, and 0.1-0.5 weight part of composite anti-oxidant into a rubber mill for melt-down, obtaining HDPE / CB composite, molding the composite into sheet material, skin heating to 140-160 deg C and pressing into copper electrode sheets.

Description

1. Technical field [0001] The invention relates to a method for improving the positive temperature coefficient (PTC) performance of a high-density polyethylene (HDPE) / carbon black (CB) composite material, belonging to the field of polymer processing. 2. Background technology [0002] Since Frydman discovered the PTC phenomenon of materials in low-density polyethylene (LDPE) filled with carbon black (CB) in 1945, the PTC materials based on polymers have been greatly improved in theoretical research and engineering application technology. With the development of polymer PTC materials, overcurrent protection components, self-control heating devices, temperature sensors, etc. have been widely used in electronics, automobiles, medical, chemical, food and other fields. There are many companies abroad, such as Raychem in the United States and Fujichang Electric Wire Co., Ltd. in Japan, which can produce self-recovery fuses and self-controlling heating cables with good quality. Due ...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K3/04C08J3/28C09C3/00
Inventor 孙扶徐闻刘鹏波范萍邹华维徐僖
Owner SICHUAN UNIV
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