Heat-conducting antistatic carbon fiber modified polyamide composite material and preparation method thereof

A technology of fiber modification and composite materials, applied in the field of thermally conductive composite materials, can solve problems such as difficult processing and low mechanical properties, and achieve the effects of improving antistatic performance, reducing shrinkage of parts, and adding less

Inactive Publication Date: 2012-07-04
NANJING JULONG SCI&TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the present invention utilizes the heat-resistant and antistatic properties of pitch-based carbon fibers, and proposes a method of heat-conducting and antistatic carbon fiber modification by increasing the number of active oxygen-containing groups on the surface of carbon fibers and reducing the content of graphite powder. The polyamide composite material and its preparation method solve the problems of difficult processing and low mechanical properties of traditional thermally conductive plastics, and also improve the antistatic performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A thermally conductive and antistatic carbon fiber modified polyamide composite material, its weight percent components are: continuous pitch-based carbon fiber: 5%, PA66 polyamide resin: 84%, compatibilizer: 5%, graphite powder: 5%, light Stabilizer: 0.7%; Antioxidant: 0.3%; Among them, graphite powder particle size ≤ 5 microns; Compatibilizer is maleic anhydride grafted polyolefin compound.

[0030] The above pitch-based carbon fibers need to undergo the following surface treatment: (1) the pitch-based carbon fibers are treated with sulfuric acid with a concentration of 40% at a temperature of 60°C for 2 hours to oxidize the surface of the pitch-based carbon fibers; (2) filter out the pitch-based carbon fibers treated in step (1) Carbon fiber, washed with distilled water until the distilled water is neutral, dried at 80°C, then sealed and placed in a treatment solution at room temperature for 2 hours, then dried, and the treatment solution was added with a titanate cou...

Embodiment 2

[0042] A thermally conductive and antistatic carbon fiber modified polyamide composite material, the components in weight percent are: chopped pitch-based carbon fiber: 15%, PA6 polyamide resin: 65%, compatibilizer: 10%, graphite powder: 9.8%, Antioxidant: 0.2%, of which graphite powder particle size ≤ 5 microns.

[0043] The above pitch-based carbon fibers need to undergo the following surface treatment: (1) the pitch-based carbon fibers are treated with ammonium persulfate with a concentration of 40% at a temperature of 80°C for 10 hours to oxidize the surface of the pitch-based carbon fibers; The pitch-based carbon fiber is washed with distilled water until the distilled water is neutral, then dried at 110°C, and then sealed in the treatment solution at room temperature for 3 hours and then dried. Ethanol solution, the concentration of the coupling agent in the treatment solution is 40%; the coupling agent is a titanate coupling agent.

[0044] The above graphite powder need...

Embodiment 3

[0055] A thermally conductive and antistatic carbon fiber modified polyamide composite material, the weight percentage of which is: continuous pitch-based carbon fiber: 40%, PA66 polyamide resin: 30%; PA6 polyamide resin: 20%, compatibilizer: 1% , Graphite powder: 8.5%, light stabilizer: 0.2%, antioxidant: 0.2%; lubricant: 0.1%; graphite powder particle size ≤ 5 microns.

[0056] The above pitch-based carbon fibers need to undergo the following surface treatment: (1) the pitch-based carbon fibers are treated with a mixed solution of ammonium persulfate and concentrated sulfuric acid with a total concentration of 30% at a temperature of 120 ° C for 2 hours to oxidize the surface of the pitch-based carbon fibers; (2) filter out The pitch-based carbon fibers treated in step (1) are washed with distilled water until the distilled water is neutral, then dried at 150°C, and then sealed in the treatment solution at room temperature for 5 hours and then dried. The treatment solution is...

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Abstract

The invention belongs to the technical field of heat-conducting composite materials and relates to a heat-conducting antistatic carbon fiber modified polyamide composite material. The composite material disclosed by the invention comprises the following components by weight percent: 5-40% of asphalt-based carbon fiber, 50-85% of polyamide resin, 1-10% of compatilizer, 5-15% of graphite micropowder and 0.1-1% of processing aid. The asphalt-based carbon fiber is subjected to surface treatments as follows: (1), oxidizing the surface of the asphalt-based carbon fiber for 2-24 hours at the temperature of 60-120 DEG C by using an oxidant; and (2) filtering out the asphalt-based carbon fiber treated in the step (1), washing the asphalt-based carbon fiber with distilled water until the distilled water is neutral, and drying the asphalt-based carbon fiber at the temperature of 80-150 DEG C; and carrying out seal standing for 2-5 hours in a treatment liquid at room temperature and then drying. The composite material disclosed by the invention is less in addition amount and simple in processing step and has a heat-conducting function, and simultaneously, the mechanical and antistatic properties of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of heat-conducting composite materials, and relates to a heat-conducting and antistatic carbon fiber modified polyamide composite material and a preparation method thereof. Background technique [0002] Traditional thermally conductive plastics use graphite, boron nitride or aluminum nitride. The blending of powder and plastic resin has disadvantages such as large amount of addition and difficulty in addition, and with the increase of additives, the overall performance of the material decreases and the density increases, which still faces difficulties in practical application. With the continuous research and development of new material technology, high-tech carbon fiber modified composite materials are not only used in high-end aerospace, military weapons and other fields, but are increasingly used in general industrial fields. Such as the automobile industry, sporting goods industry, textile machinery ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08L77/06C08L77/02C08K13/06C08K9/04C08K9/06C08K9/02C08K7/06C08K3/04
Inventor 盛静吴建国
Owner NANJING JULONG SCI&TECH CO LTD
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