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Polyurethane-carbon nano-tube-carbonyl iron powder composite foam wave absorbing sheet and preparation method thereof

A technology of carbon nanotubes and carbonyl iron powder, which is applied in the direction of electrical components, magnetic field/electric field shielding, etc., and can solve problems such as insufficient wave-absorbing performance

Inactive Publication Date: 2018-07-13
ZHEJIANG SAINTYEAR ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the absorbing properties of carbon nanotubes and polymer composite absorbing materials reported in the prior art are still insufficient.

Method used

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  • Polyurethane-carbon nano-tube-carbonyl iron powder composite foam wave absorbing sheet and preparation method thereof
  • Polyurethane-carbon nano-tube-carbonyl iron powder composite foam wave absorbing sheet and preparation method thereof
  • Polyurethane-carbon nano-tube-carbonyl iron powder composite foam wave absorbing sheet and preparation method thereof

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preparation example Construction

[0035] The present invention provides a method for preparing polyurethane-carbon nanotube-carbonyl iron powder composite foam wave-absorbing sheet described in the above technical solution, comprising the following steps:

[0036] Mix polyol, carbon nanotube, carbonyl iron powder, blowing agent, foam stabilizer and catalyst with a mass ratio of 65~75:1~5:15~40:0.2~5:0.1~4:0.4~1.2, Obtain component A;

[0037] The component A and the polyisocyanate having a mass ratio of 100:95-110 are mixed, foamed, and sliced ​​to obtain a polyurethane-carbon nanotube-carbonyl iron powder composite foam wave-absorbing plate.

[0038] In the present invention, the electromagnetic wave absorber and the polyurethane base material are integrally foamed to prepare a foam wave absorbing sheet. This process enables the electromagnetic wave absorber to be stably attached to the base material, and it is difficult for the absorber to fall off. Moreover, the preparation process is relatively simple, and...

Embodiment 1

[0046] (1) Weigh 56g of polyether 3010 (hydroxyl value 56mgKOH / g, viscosity (25°C) 400-600mPa·s), polyether 5020 (hydroxyl value 34mgKOH / g, viscosity (25°C) 800-1000mPa·s) 16g , glycerol 2.0g, carbon nanotubes (diameter of carbon nanotubes is 5-20nm, length 5-30μm) 4.0g, carbonyl iron powder (average particle diameter of carbonyl iron powder≤4μm, iron element mass content≥97 %, carbon element mass content ≤ 1%) 20g, the material is dispersed and mixed uniformly by fully stirring, and the dispersed slurry is prepared for subsequent use.

[0047] (2) Add 1.0 g of water, 2 g of silicone oil, 0.3 g of propylene glycol solution of 33% triethylenediamine, 0.1 g of propylene glycol solution of 30% bis(dimethylaminoethyl) ether, octanoic acid 0.07 g of stannous, fully stirred to make the materials evenly mixed, and prepared component A for later use.

[0048] (3) Mix component A with 100 g of polyisocyanate (PM-2110A, isocyanate content 30.5% to 32%), stir well, pour into the mold ca...

Embodiment 2

[0052] (1) Weigh 30g of castor oil (hydroxyl value 163mgKOH / g, viscosity (25°C) 680-750mPa·s), polyol SP30-15 (hydroxyl value 30mgKOH / g, viscosity (25°C) 1300-1450mPa·s) 37g, carbon nanotube (diameter of carbon nanotube is 5-20nm, length is 5-30μm) 2.5g, carbonyl iron powder (average particle diameter of carbonyl iron powder≤4μm, iron element mass content≥97%, carbon element mass Content ≤ 1%) 16g, the material is dispersed and mixed evenly by fully stirring, and the dispersion slurry is prepared for use.

[0053] (2) Add 0.8 g of water, 1.5 g of silicone oil, 0.32 g of a propylene glycol solution of 33% triethylenediamine, and 0.11 g of a propylene glycol solution of 30% bis(dimethylaminoethyl) ether to the above-mentioned dispersion slurry, 0.07 g of stannous octoate, fully stirred to make the materials evenly mixed, prepared component A for later use.

[0054] (3) Mix component A with 98g of polyisocyanate (Mendur MA-2601, isocyanate content 28% to 30%), stir well, pour in...

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Abstract

The invention provides a polyurethane-carbon nano-tube-carbonyl iron powder composite foam wave absorbing sheet and a preparation method thereof, wherein the composite foam wave absorbing sheet is prepared from a component A and polyisocyanate according to a mass ratio of 100:95-110, and the component A comprises a polyol, carbon nano-tubes, carbonyl iron powder, a foaming agent, a foam stabilizerand a catalyst according to a mass ratio of 65-75:1-5:15-40:0.2-5:0.1-4:0.4-1.2. According to the present invention, the carbon nano-tubes and the carbonyl iron powder are used as the electromagneticwave absorbents and are stably adsorbed onto the polyurethane substrate formed by carrying out the reaction on the polyisocyanate and the polyol, and the foam wave absorbing sheet obtained by integrally foaming the electromagnetic wave absorbents and the polyurethane substrate has excellent absorbing wave performance; and within 2-18 GHz, the reflection loss peak value is less than or equal to -20.1 dB (the maximum of -24.11 dB), the bandwidth of the reflection loss of less than or equal to 10 dB is more than 11 GHz, and the maximum is 16 GHz.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorbing materials, in particular to a polyurethane-carbon nanotube-carbonyl iron powder composite foam wave-absorbing sheet and a preparation method thereof. Background technique [0002] Electromagnetic wave absorbing material, referred to as wave absorbing material, is a functional material that can convert electromagnetic wave energy into heat energy or other forms of energy. Electromagnetic waves will affect the normal operation of various electronic devices, and will also endanger human health. Therefore, the research and use of wave-absorbing materials is of great significance to improve the operating environment of electronic equipment and the living environment of human beings. [0003] Carbon nanotubes are seamless, hollow one-dimensional nanotubes formed by curling single-layer or multi-layer graphite sheets. They have special helical structures, chirality and special elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/20C08G18/24C08G18/36C08K3/18C08K7/24H05K9/00C08G101/00
CPCC08G18/165C08G18/2063C08G18/244C08G18/3206C08G18/36C08G18/4804C08G18/6677C08K3/18C08K7/24C08K2201/003C08K2201/004C08K2201/011C08G2110/0083H05K9/0083
Inventor 柯维再刘学超温海林徐涛龚华旭张婷董庆文张煜曼
Owner ZHEJIANG SAINTYEAR ELECTRONICS TECH