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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 conductive materials, conductive materials, conductors, etc., can solve the problems of difficult processing and utilization, reduced conductivity, high cost, and achieve the effect of solving application problems, facilitating industrialization, and widening sources.

Inactive Publication Date: 2007-10-10
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

[0021] Take 86.21g potassium hexatitanate whiskers (0.15 mol, the whisker diameter is 0.1~5μm, the aspect ratio is 2~300) and deionized water to make 1000ml suspension slurry, and then add 15ml concentration to the suspension system. It is 10mol / L aniline, 210ml ammonium persulfate solution with a concentration of 1mol / L, 26.8g p-toluenesulfonic acid. The mixed system is continuously polymerized under mechanical stirring and room temperature for 12 hours. After filtering or centrifugal dehydration, the product is used. Wash with ionized water until the pH value of the washing liquid reaches 7, the resulting product, add 1wt% of dispersant sodium triphosphate, add water and stir to make a 20wt% slurry, after spray drying, the air inlet temperature of the spray dryer is 120℃ , The temperature of the discharge port is 90 DEG C, and the powder with a water content of 6 wt% is obtained, and the measured conductivity is 0.7 s / cm (measured by the four-probe method).

Embodiment 2

[0023] Take 150g potassium octatitanate whisker (0.204mol, the whisker diameter is 0.3-3μm, the aspect ratio is 5~500) and deionized water to make 1000ml suspension, and then add 12ml to the suspension system in order 10mol / L aniline solution, 100ml potassium iodate solution with a concentration of 1mol / L, 20ml hydrochloric acid with a concentration of 8mol / L, the mixed system is continuously polymerized under mechanical stirring and room temperature for 8 hours, and the product is filtered or centrifuged to dehydrate. Wash with deionized water until the pH value of the washing solution reaches 8. The resulting product is added with 1wt% of dispersant sodium triphosphate and stirred with water to prepare a 30wt% slurry. After spray drying, the inlet air temperature of the spray dryer is At 180°C and the temperature of the discharge port at 100°C, a powder with a water content of 8% by weight was obtained, and the measured electrical conductivity was 0.1s / cm (measured by the four-p...

Embodiment 3

[0025] Take 40g of titanium dioxide whiskers (0.5mol, the diameter of the whiskers is 0.1~4μm, the aspect ratio is 2~400) and deionized water to make 1000ml suspension, and add 10ml to the suspension system with a concentration of 10mol / L. Aniline solution, 100ml potassium dichromate solution with a concentration of 1mol / L, 20ml sulfuric acid with a concentration of 10mol / L, and the mixed system is continuously polymerized for 4 hours under mechanical stirring and room temperature. The product is filtered or centrifuged for dehydration. Wash with ionized water until the pH of the washing solution reaches 7, the resulting product, add 1wt% of dispersant sodium triphosphate, add water and stir to make a 15wt% slurry. After spray drying, the air inlet temperature of the spray dryer is 130°C , The temperature of the discharge port is 100 DEG C, and the powder with a water content of 6 wt% is obtained, and the measured conductivity is 0.06 s / cm (measured by the four-probe method).

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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 a conductive whisker coated by in-situ polymerization of aniline and a preparation method thereof. It belongs to the field of materials. Background technique [0002] With the rapid development of the electronics industry, conductive polymer materials are used more and more widely in industry. At present, most polymer materials are mixed with metal powder, metal fiber, metal flake, graphite powder, carbon fiber, and carbon black in the world. Method to improve its conductivity. The existing problems are: metal fillers are expensive, and they are prone to oxidation to reduce conductivity; graphite powder usually requires a large amount of addition (30% to 60%), which will make the product brittle; carbon fiber is also expensive because of its high price. Rarely used; carbon black is inexpensive, but its products have poor mechanical properties and molding processing properties. The most fatal weakness of these fillers is their poor co...

Claims

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Application Information

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