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Tetrapod zinc oxide whisker coated with functional layer and preparation thereof

A four-needle zinc oxide and functional package technology, applied in chemical instruments and methods, zinc oxide/zinc hydroxide, crystal growth, etc., can solve problems such as complex process, large dielectric loss, and limited application, and achieve huge applications value effect

Inactive Publication Date: 2008-10-01
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1737222A discloses a method for preparing conductive zinc oxide whiskers by introducing aluminum elements, but the process is more complicated
The four-needle zinc oxide whisker is a polar monomer, and there are electronic polarization, ion polarization, orientation polarization and cross-sectional polarization of the intrinsic electric dipole, so that the material has a large dielectric loss. It is a kind of It is a very good electric loss absorbing material, but because it does not have magnetic loss performance, it greatly limits its application in the fields of stealth technology and electromagnetic shielding technology
Aiming at this problem, Chinese patent CN1712577A discloses a method for magnetic nano-modification, but the raw material formula is relatively complicated

Method used

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  • Tetrapod zinc oxide whisker coated with functional layer and preparation thereof
  • Tetrapod zinc oxide whisker coated with functional layer and preparation thereof
  • Tetrapod zinc oxide whisker coated with functional layer and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 350ml of toluene and 23g (1.0mol) of newly cut metal sodium blocks into a 1000ml three-necked flask equipped with a stirrer, condenser, and constant pressure dropping funnel, and heat until the sodium blocks melt and stir at high speed to break them up To form sodium sand, add dropwise about 52.5ml (0.51mol) of a toluene solution of monomethyldichlorosilane monomer under the protection of nitrogen. Keep the system under reflux for about 6 hours; stop heating, cool, let stand, and filter under the protection of nitrogen after the solution is separated. The obtained filtrate was distilled off toluene under reduced pressure, and the obtained light yellow oily liquid substance was polymethylsilane (PMS).

[0024] (2) Add 100g of polymethylsilane and 1.5g of trifluoromethylmethylsiloxane into a 1000ml three-neck flask equipped with a stirrer, condenser tube, and nitrogen inlet tube, and stir well under the protection of nitrogen, and then add Crushed and refined SbC...

Embodiment 2

[0027] (1) Put 100g of solid polydimethylsilane in a 1000ml three-necked flask with a condenser and receiving device, under the protection of high-purity nitrogen, heat polydimethylsilane at 200-500°C to crack it, and collect 240- 420°C distillate. Put the liquid phase product obtained from the cracking into a 1000ml three-neck flask with a condenser tube and a receiving device, add 5.6g of aluminum acetylacetonate, raise the temperature to 500°C under the protection of high-purity nitrogen, keep it warm for 4-6 hours, fully react and cool to room temperature , and recrystallize the crude product to obtain light yellow solid aluminum-containing polycarbosilane.

[0028] (2) At room temperature, dissolve 20g of tetrapod zinc oxide whiskers and 5g of aluminum-containing polycarbosilane in 100ml of xylene, stir thoroughly, and ultrasonically oscillate for 2 to 4 hours to fully disperse the whiskers in the polymer solution. Under high-purity nitrogen atmosphere, xylene was distil...

Embodiment 3

[0030] (1) Add 100 g of hydrogen-containing polysiloxane (HPO) and 1.5 g of trifluoromethylmethylsiloxane into a 1000 ml three-neck flask equipped with a stirrer, condenser tube, and nitrogen gas inlet tube, and fully Stir well, then add crushed and refined SbCl 3 3.8g, control the larger nitrogen flow rate of 100-1000ml / min, stir rapidly for 1-2 hours, then reduce the rotation speed to about 300-400 rpm, fully react to remove HCl, and react at room temperature for about 20-32 hours. The gas released from the trachea no longer makes the pH test paper turn red, and the reaction can be stopped. After recrystallization, the solid substance obtained is antimony-containing polysiloxane.

[0031] (2) At room temperature, dissolve 10g of tetraacicular zinc oxide whiskers and 5.5g of antimony-containing polysiloxane in 100ml of n-hexane, stir well, and oscillate ultrasonically for 2-4 hours to fully disperse the whiskers in the polymer solution In a high-purity nitrogen atmosphere, n...

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Abstract

The invention discloses a four-needle shaped zinc oxide crystal whicker of functional coating layer and preparation method thereof, comprising the steps of coating product prepared by high temperature cracking reaction containing metal organic silicon polymer on surface of the four-needle shaped zinc oxide crystal whicker. The prepared four-needle shaped zinc oxide crystal whicker of functional coating layer can not only obtain conduct crystal whicker or magnetic crystal whicker, but also maintain the four-needle structure of the crystal whicker to maintain regularity of the shape and consistency of the size, characterized in high intensity, high modulus, high temperature resistance and so on. The invention has great potential application value in the fields of anti-static, electric-magnetic screen, radar absorbing and so on.

Description

technical field [0001] The invention relates to a tetraacicular zinc oxide whisker of a functional coating layer and a preparation method thereof. Background technique [0002] Tetraacicular ZnO whisker is an n-type semiconductor with a volume resistivity in the semiconductor range. The special tetraacicular structure makes it dispersed in the matrix to efficiently overlap to form a network structure, effectively improving the tetraacicular ZnO whisker. The conductivity of whiskers can be added to paint, plastic, rubber and other products to prepare antistatic materials. Chinese patent CN1737222A discloses a method for preparing conductive zinc oxide whiskers by introducing aluminum element, but the process is complicated. The four-needle zinc oxide whisker is a polar monomer, and there are electronic polarization, ion polarization, orientation polarization and cross-sectional polarization of the intrinsic electric dipole, so that the material has a large dielectric loss. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B33/00C30B29/16C30B29/62C01G9/02C08K7/08C08K9/06C09C1/04C09C3/12
Inventor 邢欣刘汉东王应德王军夏宁博李效东
Owner NAT UNIV OF DEFENSE TECH
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