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Conductive whiskers in situ polymerized and cladded by aniline and its preparation method

An in-situ polymerization and whisker technology, applied in the direction of conductive materials, conductive materials, conductors, etc., can solve the problems of difficult processing and utilization, reduced conductivity, high price, etc., and achieve the effect of solving application problems, facilitating industrialization, and low price

Inactive Publication Date: 2006-06-14
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing problems are: the price of metal fillers is high, and it is prone to oxidation to reduce the conductivity; graphite powder usually requires a large amount of addition (30% to 60%), which will make the product brittle; Rarely used; carbon black is cheap, but its mechanical properties and molding performance are poor
However, the dispersion of polyaniline is poor, it is almost insoluble in any solvent, and it is difficult to be processed and utilized by the melting method[6-11]. -15]
However, due to the complexity of the process (requiring heating, vacuum sealing, etc.) and high cost, these methods mostly stay in the laboratory stage and are not convenient for industrial application.

Method used

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  • Conductive whiskers in situ polymerized and cladded by aniline and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 86.21g of potassium hexatitanate whiskers (0.15mol in total, the whisker diameter is 0.1-5μm, aspect ratio is 2-300) and deionized water to make 1000ml suspension slurry, add 15ml concentration 10mol / L aniline, 210ml ammonium persulfate solution with a concentration of 1mol / L, and 26.8g p-benzenesulfonic acid. The mixed system was mechanically stirred and continuously polymerized at room temperature for 12 hours. After the product was filtered or centrifugally dehydrated, it was used to Wash with ionized water until the pH value of the lotion reaches 7, add 1wt% dispersant sodium triphosphate to the product obtained, add water and stir to make a 20wt% slurry, spray dry, and the air inlet temperature of the spray dryer is 120 °C , the outlet temperature was 90° C., and the powder with a water content of 6 wt % was obtained, and the measured electrical conductivity was 0.7 s / cm (measured by four-probe method).

Embodiment 2

[0024] Take 150g of potassium octatitanate whiskers (0.204mol in total, the diameter of the whiskers is 0.3-3μm, and the aspect ratio is 5-500) and deionized water to make a 1000ml suspension, and add 12ml of 10mol / L aniline solution, 100ml of potassium iodate solution with a concentration of 1mol / L, 20ml of hydrochloric acid with a concentration of 8mol / L, the mixed system was mechanically stirred and continuously polymerized at room temperature for 8 hours, and the product was filtered or centrifuged. Wash with deionized water until the pH value of the lotion reaches 8, the resulting product, add 1wt% dispersant sodium triphosphate, add water and stir to make a 30wt% slurry, spray dry, the air inlet temperature of the spray drier is 180° C., the outlet temperature was 100° C., and a powder with a water content of 8 wt % was obtained, and the measured electrical conductivity was 0.1 s / cm (measured by the four-probe method).

Embodiment 3

[0026] Take 40g of titanium dioxide whiskers (0.5mol in total, the diameter of the whiskers is 0.1-4μm, and the aspect ratio is 2-400) and deionized water to make a 1000ml suspension, and add 10ml to the suspension system successively with a concentration of 10mol / L Aniline solution, 100ml of potassium dichromate solution with a concentration of 1mol / L, 20ml of sulfuric acid with a concentration of 10mol / L, the mixed system was mechanically stirred and continuously polymerized for 4 hours at room temperature, and the product was filtered or centrifuged. Wash with ionized water until the pH value of the lotion reaches 7. Add 1wt% of the dispersant sodium triphosphate to the obtained product, add water and stir to make a 15wt% slurry, and spray dry. The air inlet temperature of the spray dryer is 130°C , the outlet temperature was 100° C., and the powder with a water content of 6 wt % was obtained, and the measured electrical conductivity was 0.06 s / cm (measured by four-probe met...

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Abstract

The present invention relates to a submicrometer-grade electro-conductive whisker covered with in-situ polymerized aniline. Its preparation process includes the following steps: successively adding aniline, Brnsted acid and oxidant into whisker water-phase suspension system according to a certain ratio (in which the mole ratio of aniline, oxidant and whisker is 1:0.4-1.4:1-10), under the condition of mechanical stirring and room temperature making the mixed system implement continuous polymerization reaction for 4-12hr, filtering or centrifugal dehydrating, then washing by using deionized water until the pH value of washing liquor is reached to 6-8, spray-drying so as to obtain the invented product. The obtained electro-conductive whisker is potassium hexatitanate whisker, potassium octatitanate whisker or titanium dioxide whisker covered with polyaniline, its average diameter is 0.1-5 micrometers, and its length-to-diameter ratio is 2-500.

Description

technical field [0001] The invention discloses an aniline in-situ polymerization-coated conductive whisker and a preparation method thereof. belongs to the field of materials. Background technique [0002] With the rapid development of the electronics industry, conductive polymer materials are more and more widely used in industry. At present, most of the international polymer materials are mixed with metal powder, metal fiber, metal sheet, graphite powder, carbon fiber, and carbon black. method to increase its conductivity. The existing problems are: the price of metal fillers is high, and it is prone to oxidation to reduce the conductivity; graphite powder usually requires a large amount of addition (30% to 60%), which will make the product brittle; Rarely used; carbon black is cheap, but its mechanical properties and molding performance are poor. The most fatal weakness of these fillers is poor compatibility and adhesion with polymer materials, which in turn makes the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C08K7/02H01B1/00
Inventor 陆小华史以俊王昌松冯新
Owner NANJING UNIV OF TECH
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