Inorganic non-metallic conductivity, electromagnetic shielding powder and method for making same and application

An inorganic non-metallic and electromagnetic shielding technology, applied in the direction of magnetic/electric field shielding, conductors, shielding, etc., can solve the problems of difficult matrix materials, poor conductivity, and low price, and achieve stable product properties, easy control of conditions, and simple preparation methods Effect

Inactive Publication Date: 2007-03-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] shielding substance advantage shortcoming metal silver powder Excellent electrical conductivity, good stability The price is high and the ratio is large copper powder Good electrical conductivity, low price, In the low frequency area (<30MHz) Shielding better than nickel specific, easy to oxidize nickel powder Good conductivity and low price Specific large, poor oxidation resistance (but excellent in copper) Non-metallic graphite, carbon black pink Good weather resistance, low price, Small specific gravity Poor electrical conductivity, not easy to contact with matrix material Fusion, poor shielding effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 15g of tin tetrachloride pentahydrate in appropriate distilled water, add 15ml of ammonia water while stirring continuously, and add 1.5g of oxalic acid after washing the colloidal precipitate with water, and put it in an oven at 80-100°C to dry Dry, put the dry matter into a porcelain boat, and gradually raise the temperature to 550°C in a tube furnace under a nitrogen atmosphere, keep it for 25 minutes, stop heating, continue to pass nitrogen, and wait until it cools to room temperature, you can get a brown-yellow non-quantitative tin oxide material, whose main phase is SnO 2 , the conductivity is 4S / m, and the specific surface area is 37.6m 2 / g.

[0024] The obtained brown non-metered tin oxide is used for preparing electromagnetic shielding coatings. Its ratio is as follows:

[0025] Acrylic resin: 15g

[0026] Diluent (n-butyl fat: xylene = 1:1): 3.5g

[0027] Tin non-metering compound: 75g

[0028] Silane coupling agent: 4g

[0029] BYK-110 wettin...

Embodiment 2

[0033] Weigh 20g of molybdic acid and grind it finely in a mortar, measure 6mL of hydrazine hydrate (80%) into the mortar with a graduated cylinder, then add 3g of oxalic acid and an appropriate amount of water to adjust to a moderate humidity, grind evenly, and stir. Then put it in an oven to dry at 90-100°C, grind it finely, put the dry matter into a porcelain boat, and gradually raise the temperature to 760°C in a tube furnace under a nitrogen atmosphere, keep it for 25 minutes, stop heating, and continue to pass nitrogen, After cooling to room temperature, brown non-meterized molybdenum oxide can be obtained, and its main phase is MoO 2 , the second phase is Mo 4 o 11 , the conductivity is 1300S / m, and the specific surface area is 25.0m 2 / g.

[0034] The obtained brown non-metered molybdenum oxide is used to prepare electromagnetic shielding coatings. Its ratio is as follows:

[0035] Oxycarbon resin: 20g

[0036] Diluent (eac: dibutyl fat = 1: 2): 5.5g

[0037] Vx...

Embodiment 3

[0045] Take 20g of titanium (III) glutarate, add 5g of oxalic acid and 8mL of hydrazine hydrate (80%), grind evenly, put it in an oven for drying at 70-80°C, grind it finely, and put the dry matter into a porcelain boat , in a tube furnace, gradually raise the temperature to 650°C under a nitrogen atmosphere, maintain it for 10 minutes, stop heating, continue to pass nitrogen, and wait to cool to room temperature, you can get black non-metering titanium oxide, the main phase is Ti 2 O, the secondary phase is Ti 2 o 3 , the conductivity is 1200-1800S / m, and the specific surface area is 35.2m 2 / g.

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Abstract

This invention relates to chemical technique field and to inorganic non-metal conductive and electromagnetic shield powder and its process method, which comprises the following steps: in tin compound, tin quality percentage is as 76-85% and molybdenum percentage of 70-80% and titanium as 75-85% and vanadium percentage of 58-65%. The process method comprises the following steps: adding hydrazine and oxalic acid or compound into front compound of tin, molybdenum and titanium and vanadium for mixture and drying; then under 450DEG C-900DEG C nitrogen gas for fifteen minutes for lifting process for ten to thirty minutes to get needed product.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and specifically relates to a kind of inorganic non-metal conductive and electromagnetic shielding powder composed of tin, molybdenum, titanium and vanadium non-quantitative compounds (oxides, nitrides and carbides) and its preparation method and application . Background technique [0002] With the rapid development of electronics and informatization and the increasing computing speed of CPU (central processing unit), the problems of electromagnetic compatibility, information security and noise pollution are becoming more and more serious. How to prevent electromagnetic shielding has become a concern of people. In addition, as people's awareness of environmental protection continues to increase, there are more and more devices, equipment, locations and places that require electromagnetic shielding in the real world. [0003] At present, from domestic and foreign research, one of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00G12B17/02H01B1/00
Inventor 吴介达李雄平李晓银陆慈娣
Owner TONGJI UNIV
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