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

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 ...

Examples

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 ℃.

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 ...

Examples

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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