Preparation method of strontium ferrite-SiO2/carbon nanotube/hydrogenated bisphenol A epoxy resin composite wave-absorbing material

A composite wave-absorbing material, strontium ferrite technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems that cannot meet the high performance, transparency, insulation, strength drop, and easy discoloration of LED packaging materials. Achieve the effect of low viscosity, easy viscosity and good transparency

Inactive Publication Date: 2013-02-13
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary bisphenol A type epoxy resin cured products are easy to change color under long-term ultraviolet irradiation, resulting in a significant decline in transparency, insulation, strength and other indicators, which cannot meet the high-performance development of LED packaging materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) According to the stoichiometric ratio of SrFe 2 o 4 Weigh 2.12g Sr(NO 3 ) 2 , 8.08g Fe(NO 3 ) 3 9H 2 O was dissolved in 30mL of absolute ethanol, and kept in a constant temperature water bath at 50°C for 30min. 2 Measure 0.70mL tetraethyl orthosilicate (TEOS) at a mass ratio of 4:1, and slowly add it dropwise to the above alcohol solution of nitrate, continue in a constant temperature water bath at 65°C until it forms a gel, and dry it under vacuum at 80°C for 12 hours to form a dry gel , ground, kept at 950°C for 2h, and ground again to obtain strontium ferrite-SiO 2 composite material.

[0015] (2) Weigh 6g of hydrogenated bisphenol A, 11.5g of epichlorohydrin, 3g of sodium hydroxide and 0.18g of tetramethylammonium chloride into 50mL of methyl isobutyl ketone, and keep stirring in a constant temperature water bath at 60°C. After condensation and reflux for 6 hours, the mixture was extracted 2~3 times with 60mL deionized water, and 1.5g of 30% sodium h...

Embodiment 2

[0018] Strontium Ferrite-SiO 2 , The preparation method of liquid hydrogenated bisphenol A type epoxy resin is the same as example 1 (1), (2) respectively. Weigh 0.03g of multi-walled carbon nanotubes with a diameter of 10-20nm, 0.01g of strontium ferrite-SiO 2 , the preparation method is the same as Example 1 (3), to obtain strontium ferrite-SiO 2 / carbon nanotubes / hydrogenated bisphenol A type epoxy resin composite (X=0.03). The prepared composite material has a frequency bandwidth of 10.5 GHz in which the reflectivity loss value is lower than -10dB in 2~18GHz, and the minimum reflectivity loss value can reach -45dB.

Embodiment 3

[0020] Strontium Ferrite-SiO 2 , The preparation method of liquid hydrogenated bisphenol A type epoxy resin is the same as example 1 (1), (2) respectively. Weigh 0.05g of multi-walled carbon nanotubes with a diameter of 10~20nm, 0.01g of strontium ferrite-SiO 2 , the preparation method is the same as Example 1 (3), to obtain strontium ferrite-SiO 2 / carbon nanotubes / hydrogenated bisphenol A type epoxy resin composite (X=0.05). The prepared composite material has a frequency bandwidth of 12.7GHz in which the reflectivity loss value is lower than -10dB in 2~18GHz, and the minimum reflectivity loss value can reach -44dB.

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Abstract

The invention provides a preparation method of a strontium ferrite-SiO2/carbon nanotube/hydrogenated bisphenol A epoxy resin composite wave-absorbing material. The preparation method comprises the following steps: preparing a strontium ferrite-SiO2 composite material from nitrate, ethyl orthosilicate, absolute ethanol and the like by a sol-gel process; and preparing the strontium ferrite-SiO2/carbon nanotube/hydrogenated bisphenol A epoxy resin composite wave-absorbing material from the strontium ferrite-SiO2 composite material, carbon nanotube, hydrogenated bisphenol A, epoxy chloropropane and the like. The composite material has the advantages of favorable transparency, low viscosity and easy casting, has electric loss and magnetic loss properties, and thus, has important application value in the fields of stealth technology, electromagnetic shielding, human body safety protection and the like.

Description

technical field [0001] The invention belongs to the field of preparation of electromagnetic wave absorbing materials, in particular to a strontium ferrite-SiO 2 A preparation method of a carbon nanotube / hydrogenated bisphenol A type epoxy resin composite wave-absorbing material. Background technique [0002] Epoxy resin has long been known and applied in many fields due to its excellent performance, among which the encapsulation of light-emitting diodes with bisphenol A epoxy resin is a very important application field. Ordinary bisphenol A type epoxy resin cured products are easy to change color under long-term ultraviolet irradiation, resulting in a significant decline in transparency, insulation, strength and other indicators, which cannot meet the high-performance development of LED packaging materials. [0003] Therefore, the present invention uses hydrogenated bisphenol A as raw material to prepare hydrogenated bisphenol A type epoxy resin, by adding strontium ferrit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/02C08K3/22C08K3/36C08K7/00C08K3/04H05K9/00
Inventor 谢宇赵杰李明俊闫思凤黄彦朱卫多刘锦梅潘建飞刘福明石磊张凯赖强
Owner STATE GRID CORP OF CHINA
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