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High conductive polyamide/graphite nano conductive composite material and preparation method thereof

A nano-conductive and high-conductivity technology, applied in the field of nano-conductive composite material preparation, can solve the problems of low filler content, complex process, unfavorable application, etc., and achieve the effects of excellent processing performance, advanced technology and broad industrialization prospects.

Inactive Publication Date: 2007-12-05
扬州利贞复合材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two methods have prepared nano-conductive composite materials with lower filler content and higher electrical conductivity, because they both use in-situ polymerization, the process is more complicated and energy- and time-consuming, so it is not possible to conducive to practical application

Method used

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  • High conductive polyamide/graphite nano conductive composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0018] Add natural flake graphite (30-200 mesh) into the mixture of concentrated sulfuric acid and concentrated nitric acid (mass ratio: 4:1) and soak for 24 hours. Heat treatment to obtain expanded graphite with an expansion ratio of 200-400 times. Take 9.9 grams of nylon 6 resin and add it to 200 ml of formic acid. After it is completely dissolved, add 0.1 grams of the above-mentioned graphite and ultrasonically 2 hours to obtain a uniformly dispersed mixture. Then add 200 ml of deionized water as a precipitant to precipitate the dispersed mixture. The precipitate was suction-filtered, washed with water, and dried to prepare a high-conductivity polyamide / graphite nano-conductive composite material containing 1 wt% of EG. The electrical conductivity and notched impact strength data of the obtained composites are shown in Fig. 1 and Fig. 2 .

Embodiment 2

[0020] The implementation steps are the same as in Example 1, the nylon 6 resin consumption is 9.8 grams, and the expanded graphite is 0.2 grams. The electrical conductivity and notched impact strength data of the obtained composites are shown in Fig. 1 and Fig. 2 .

Embodiment 3

[0022] Implementation steps are the same as in Example 1, the consumption of nylon 6 resin is 9.2 grams, and the expanded graphite is 0.8 grams. The electrical conductivity and notched impact strength data of the obtained composites are shown in Fig. 1 and Fig. 2 .

[0023] When the polyamide resin is nylon 66 or nylon 1010, nylon 11, nylon 12, nylon 46, nylon 610, nylon 612, nylon 1212, or aromatic nylon, a highly conductive polyamide / graphite nanoconductive composite material can also be prepared.

[0024] When the solvent is formic acid, m-cresol, dimethylformamide, trifluoroethanol, α-cyanohydrin, methanol-calcium chloride, hexamethylphosphoric triamide, 1:1 phenol-tetrachloroethane, the same A highly conductive polyamide / graphite nanoconductive composite material was prepared.

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Abstract

The present invention discloses nanometer conducting polyamide / graphite composite material and its preparation process. The nanometer conducting polyamide / graphite composite material is prepared through the following steps: soaking 30-200 mesh natural scale graphite powder in mixed liquid of concentrated sulfuric acid and concentrated nitric acid in the weight ratio of 4 to 1 for 24 hr, water washing, drying and heating at 900-1100 deg.c in a muffle furnace to obtain expandable graphite of expansion ratio over 200; dissolving polyamide resin in 90-99 weight portions in some solvent, adding the expandable graphite in 1-10 weight portions, ultrasonically dispersing for 2 hr, adding precipitant while stirring, suction filtering the precipitate and drying to obtain the composite material. The composite material with relatively low percolation threshold and high conductivity may be applied as antistatic material, electromagnetic shielding material, etc.

Description

technical field [0001] The invention relates to a conductive polyamide (nylon) composite material, in particular to a preparation method of a nano conductive composite material composed of polyamide and graphite. Background technique [0002] Nylon (polyamide) is a thermoplastic engineering plastic with excellent performance. It is widely used in industrial fields and daily life. Its application fields range from automobiles, electronic appliances, machinery, aerospace to daily necessities. It has excellent mechanical properties, good electrical properties, wear resistance, oil resistance, solvent resistance, self-lubrication, corrosion resistance and good processing properties. However, the electrical insulation properties of nylon make it easy to generate static electricity, which limits its application. The method of adding micron-sized conductive fillers such as carbon black is usually used to improve the conductive properties of polymers. Although it can also improve ...

Claims

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Application Information

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IPC IPC(8): C08L77/00C08K3/04H01B1/24
Inventor 张明李大军向晨严长浩鲁萍吴德峰
Owner 扬州利贞复合材料有限公司
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