Method for preparing PTC (positive temperature coefficient) material by compounding polyaniline/carbon black/polyolefin

A polyaniline and polyolefin technology is applied in the field of preparing self-limiting temperature conductive functional materials, which can solve the problems of limiting the industrial application of conductive composite materials, lack of large-scale production, high cost, etc., and achieve uniform particle size distribution and improved compatibility. performance, dust reduction effect

Inactive Publication Date: 2014-01-01
TAICANG JINKAI SPECIAL TYPE CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most of the currently coated organic polymers are harsh, expensive, and lack the possibility of large-scale production, which limits the industrial application of organic polymer-coated carbon black to prepare conductive composites.

Method used

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  • Method for preparing PTC (positive temperature coefficient) material by compounding polyaniline/carbon black/polyolefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: process carbon black and aniline, place carbon black in a vacuum oven and dry to constant weight at a drying temperature of 50°C, and process aniline by vacuum distillation;

[0035] Step 2: Add aniline to the hydrochloric acid solution, and add carbon black, the ratio of aniline monomer to carbon black is 5:1;

[0036] Step 3: ultrasonically disperse the solution formed in step 2, and slowly add ammonium persulfate hydrochloric acid solution dropwise to the solution under mechanical stirring;

[0037] Step 4: Repeatedly washing the polyaniline / carbon black product generated in the suction filtration step 3 with deionized water;

[0038] Step 5: Mix the high-density polyethylene and the polyaniline / carbon black produced in Step 4 in a proportion of 100:25 in a banbury mixer evenly, and the banbury temperature is 150°C;

[0039] Step 6: Discharge, slice, and pelletize the product generated in step 5;

[0040] Step 7: Press the sheet formed in Step 6 on a flat v...

Embodiment 2

[0042] Step 1: process carbon black and aniline, place carbon black in a vacuum oven and dry to constant weight at a drying temperature of 50°C, and process aniline by vacuum distillation;

[0043] Step 2: Add aniline to the hydrochloric acid solution, and add carbon black, the ratio of aniline monomer to carbon black is 10:3;

[0044] Step 3: ultrasonically disperse the solution formed in step 2, and slowly add ammonium persulfate hydrochloric acid solution dropwise to the solution under mechanical stirring;

[0045] Step 4: Repeatedly washing the polyaniline / carbon black product generated in the suction filtration step 3 with deionized water;

[0046] Step 5: Mix the high-density polyethylene and the polyaniline / carbon black produced in Step 4 according to the ratio of 100:27 in the banbury mixer evenly, and the banbury temperature is 150°C;

[0047] Step 6: Discharge, slice, and pelletize the product generated in step 5;

[0048] Step 7: Press the sheet formed in step 6 o...

Embodiment 3

[0050] Step 1: process carbon black and aniline, place carbon black in a vacuum oven and dry to constant weight at a drying temperature of 50°C, and process aniline by vacuum distillation;

[0051] Step 2: Add aniline to the hydrochloric acid solution, and add carbon black, the ratio of aniline monomer to carbon black is 5:1;

[0052] Step 3: ultrasonically disperse the solution formed in step 2, and slowly add ammonium persulfate hydrochloric acid solution dropwise to the solution under mechanical stirring;

[0053] Step 4: Repeatedly washing the polyaniline / carbon black product generated in the suction filtration step 3 with deionized water;

[0054] Step 5: Mix high-density polyethylene and polyaniline / carbon black produced in Step 4 in a proportion of 100:27 in a banbury mixer evenly, and the banbury temperature is 150°C;

[0055] Step 6: Discharge, slice, and pelletize the product generated in step 5;

[0056] Step 7: Press the sheet formed in Step 6 on a flat vulcaniza...

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Abstract

A method for preparing a PTC material by compounding polyaniline/carbon black/polyolefin comprises the steps as follows: step one, the carbon black and aniline are processed; step two: the aniline is added to a hydrochloric acid solution, and then the carbon black is added; step three: the formed solution is subjected to ultrasonic dispersion, and a ammonium persulfate hydrochloric acid solution is dropwise added into the solution; step four: a formed polyaniline/carbon black product is washed and leached repeatedly with deionized water; step five: high-density polyethylene and polyaniline/carbon black are uniformly refined in a banbury mixer; step six: a product is discharged, batched-off and subjected to grain-sized dicing; and step seven: sheet materials are sheeted on a slab vulcanization machine tool, and plastic particles are extruded to form self-temperature-limiting heating/heat tracing cables, and then electronic radiation crosslinking is realized; and in the step one, the carbon black is placed in a vacuum drying oven and dried to the constant weight, and the aniline is processed through pressure reduction distillation. According to the method, reaggregation of carbon black particles is prevented, so that particles are uniformly distributed, and the performance of the PTC material is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of a self-limiting temperature conductive functional material, in particular to a method for preparing a self-limiting temperature conductive functional material (hereinafter referred to as PTC material) by compounding polyaniline / carbon black / polyolefin. Background technique [0002] Carbon black (CB) filled polymers to prepare heteroelectric composite materials have a positive temperature coefficient effect and have a wide range of application prospects. They can be used in self-controlling heating belts, overheating protection devices, and polymer resettable fuses. [0003] The surface of carbon black contains a large number of polar groups, which are difficult to disperse and easy to flocculate. Due to the thermodynamic incompatibility of polymer materials and inorganic fillers in heteroelectric composite materials prepared by carbon black-filled polymers, the general trend of change during long-term us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K9/10C08K3/04C08G73/02H01B13/00
CPCC08G73/0266C08K3/04C08K9/10C08L2207/062H01B13/00C08L23/06
Inventor 顾建忠吴明红蔡建球
Owner TAICANG JINKAI SPECIAL TYPE CABLE
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