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Preparation method for flexible high-molecular PTC material

A flexible polymer and ratio control technology, which is applied in the field of preparation of flexible polymer PTC materials, can solve the problems of lack of flexibility and large amount of carbon black added, and achieve the effect of reduced carbon black amount and low conductive threshold

Inactive Publication Date: 2015-04-08
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of large amount of carbon black added in current polymer PTC materials that use carbon black as the conductive material, and the lack of flexibility of existing polymer PTC products; a PTC based on blended HDPE / WGRT elastomer is proposed The preparation method of the material is simple, the amount of carbon black added is low, the product is flexible and elastic, and it gives good feasibility for mass production

Method used

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  • Preparation method for flexible high-molecular PTC material
  • Preparation method for flexible high-molecular PTC material
  • Preparation method for flexible high-molecular PTC material

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Preparation of PTC materials based on blended HDPE / carbon black / SBS / WGRT

[0026] At room temperature, first add 20.0 grams of HDPE particles into a 160°C open mill with a roller spacing of 1.0 mm for melting and plasticization; after the resin is completely plasticized, add 3.6 grams of N220 carbon black, and the mixing time is 5 minutes ; Then add 5.0 grams of SBS and knead for 3 minutes; then add 80.0 grams of WGRT and continue to melt and blend for 8 minutes; increase the roller distance and lower the sheet;

[0027] Mold the obtained melt-blended sample with a hydraulic hot plate vulcanizer to obtain a sample of about 1mm. Molding conditions: the stainless steel mold is lined with a polytetrafluoroethylene isolation film, the sample is preheated at 165°C for 5 minutes, and the air is exhausted 3 times , and then hold the pressure at 10MPa for 8min, take out the cold press for 8min and then release the sheet; 60 ) for irradiation cross-linking at a dose ...

Embodiment 2

[0029] Example 2: Preparation of PTC materials based on blended HDPE / carbon black / SBS / WGRT

[0030] At room temperature, first add 40.0 grams of HDPE particles into an open mill at 165°C with a roller spacing of 1.0 mm for melting and plasticization; after the resin is completely plasticized, add 8.0 grams of N220 carbon black, and the mixing time is 8 minutes ; Then add 4.0 grams of SBS and knead for 3 minutes; then add 60.0 grams of WGRT and continue to melt and blend for 6 minutes; increase the roller distance and lower the sheet;

[0031] Mold the obtained melt-blended sample with a hydraulic hot plate vulcanizer to obtain a sample of about 1mm. Molding conditions: the stainless steel mold is lined with a polytetrafluoroethylene isolation film, the sample is preheated at 165°C for 5 minutes, and the air is exhausted 3 times , and then hold the pressure for 8min under the pressure of 12MPa, take out the cold press for 8min and then release the sheet; 60 ) for irradiation cro...

Embodiment 3

[0033] Example 3: Preparation of PTC materials based on blended HDPE / carbon black / SBS / WGRT

[0034] At room temperature, first add 50.0 grams of HDPE particles into a 170°C open mill with a roller spacing of 1.0mm for melting and plasticization; after the resin is completely plasticized, add 11.0 grams of N220 carbon black and mix for 10 minutes ; Then add 3.0 grams of SBS and knead for 3 minutes; then add 50.0 grams of WGRT and continue to melt and blend for 5 minutes; increase the roller distance and lower the sheet;

[0035] Mold the obtained melt blended sample with a hydraulic hot plate vulcanizer to obtain a sample of about 1mm. Molding conditions: the stainless steel mold is lined with a polytetrafluoroethylene isolation film, the sample is preheated at 165°C for 5 minutes, and the air is exhausted 3 times , and then hold the pressure for 8min under the pressure of 15MPa, take out the cold press for 8min and then release the sheet; 60 ) for irradiation cross-linking at...

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Abstract

The invention relates to a preparation method for a flexible high-molecular PTC material. The preparation method comprises the following successive steps: (1) dispersing carbon black in a high density polyethylene (HDPE) resin by using a melt blending process; (2) adding a styrene-butadiene-styrene segmented copolymer (SBS) into the mixture of HDPE and carbon black and carrying out melt mixing; (3) adding waste ground rubber tire powder into a molten mixture of HDPE / carbon black / SBS and carrying out melt blending; and (4) subjecting a blending product to compression molding so as to obtain a sheet-like substance and carrying out cross-linking with gamma rays (Co60). According to the invention, carbon black is dispersed in a continuous phase of a blending-type elastomer, a PTC effect appears under the condition of temperature rise, so the flexible high-molecular material with PTC performance is obtained. The method is simple; product conductivity is easy to control, and the material has good flexibility and can be produced in mass quantities.

Description

technical field [0001] The invention relates to a preparation method of a flexible polymer PTC material, in particular to a preparation method of a PTC material based on a blended elastomer, in particular to a method for dispersing carbon black in styrene-butadiene - A kind of PTC with the flexibility of elastomer and low conductive threshold obtained in the high-density polyethylene (HDPE) / waste tire rubber (WGRT) blend system with styrene block copolymer (SBS) interface compatibilization The method of preparation of the material. Background technique [0002] Usually, crystalline or semi-crystalline polymer composites filled with conductive materials can exhibit the characteristics of positive temperature coefficient PTC (positive temperature coefficient), that is, within a certain temperature range, the resistivity of the material itself increases with the increase of temperature. Phenomenon. Since Frydman discovered this phenomenon in 1945, polymer PTC has become a res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/28C08J3/24C08L23/06C08L21/00C08L53/02C08K3/04
Inventor 王兆波赵静魏东亚王新
Owner QINGDAO UNIV OF SCI & TECH
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