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A kind of light-weight high-strength high electromagnetic shielding efficiency material and preparation method thereof

An electromagnetic shielding material and electromagnetic shielding technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of light weight and low shielding efficiency, and achieve lightweight electromagnetic shielding efficiency, excellent mechanical properties, economical and practical preparation process. Effect

Active Publication Date: 2021-04-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a light-weight, high-strength, high-efficiency electromagnetic shielding material and its preparation method, which are used to solve the problems of lightweight and low shielding efficiency of polyurethane electromagnetic shielding materials in the prior art , with good mechanical properties

Method used

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  • A kind of light-weight high-strength high electromagnetic shielding efficiency material and preparation method thereof
  • A kind of light-weight high-strength high electromagnetic shielding efficiency material and preparation method thereof

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preparation example Construction

[0027] The invention discloses a light-weight, high-strength, high-electromagnetic shielding performance material and a preparation method thereof. The raw materials include the following components in parts by mass: 100 parts of mixed polyether polyol, 0.7-2.1 parts of catalyst, and 3-3 parts of foam stabilizer 6 parts, 0.5-4.5 parts of water, 2-20 parts of composite carbon nanotubes, 105-120 parts of polyisocyanate.

[0028] Mixed polyether polyols are composed of one or more polyether polyols mixed in a certain proportion, and the total mass fraction is 100 parts; the functionality of polyether polyols is 2-4, the number-average molecular weight is 300-2000, and the viscosity is 300~1000mPa·s.

[0029] The composite carbon nanotubes are composed of carbon nanotubes A and carbon nanotubes B mixed in a certain proportion, the sum of the parts by mass is 2 to 20 parts, and the length of the carbon nanotubes A is at least 10 to 20 parts of the length of the carbon nanotubes B. ...

Embodiment 1

[0038] The preparation method step of polyurethane electromagnetic shielding material is as follows:

[0039] S1. Weigh 50 parts of polyether polyol N330 and 50 parts of polyether polyol N303 into a three-necked flask and mix them mechanically for 10 minutes to obtain a uniform mixed polyether polyol. Dehydration for 2 hours;

[0040]S2, add 6 parts of carbon nanotubes A and 4 parts of carbon nanotubes B, 1.75 parts of composite catalysts (1 part of dibutyltin dilaurate and 0.75 parts of triethylenediamine), 3 parts of carbon nanotubes B, 3 parts of mixed polyether polyols after dehydration successively 1 part of AK8805 and 1.5 parts of deionized water, stirred for 10 minutes, so that the slurry was fully stirred, mixed and dispersed, and a polyether polyol slurry with uniform dispersion of each component was obtained;

[0041] S3. Take 105 parts of polymethylene polyphenyl isocyanate (PAPI) and add it to the polyether polyol slurry, and stir it rapidly for 30 seconds, pour t...

Embodiment 2

[0043] The preparation method step of polyurethane electromagnetic shielding material is as follows:

[0044] S1. Weigh 60 parts of polyether polyol N330 and 40 parts of polyether polyol N303 into a three-necked flask and mix them mechanically for 10 minutes to obtain a uniform mixed polyether polyol. Dehydration for 2 hours;

[0045] S2, add 8 parts of carbon nanotubes A and 2 parts of carbon nanotubes B, 1.75 parts of composite catalysts (1 part of dibutyltin dilaurate and 0.75 parts of triethylenediamine), 3 parts of carbon nanotubes B, 3 parts of mixed polyether polyols after dehydration successively 1 part of AK8805 and 1.5 parts of deionized water, stirred for 10 minutes, so that the slurry was fully stirred, mixed and dispersed, and a polyether polyol slurry with uniform dispersion of each component was obtained;

[0046] S3. Take 110 parts of polymethylene polyphenyl isocyanate (PAPI) and add it to the polyether polyol slurry, and stir it fully for 30 seconds quickly,...

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Abstract

The invention discloses a light-weight, high-strength, high-electromagnetic shielding performance material and a preparation method thereof. The material is formed by mixing and reacting polyether polyol slurry and polyisocyanate. Polyether polyol slurry is composed of mixed polyether polyol, composite carbon nanotubes, catalyst, foam stabilizer and water. Among them, the mixed polyether polyol is formed by mixing one or more polyether polyols in a certain proportion; the composite carbon nanotube is prepared by carbon nanotube A and carbon nanotube B through a preferred ratio, and the carbon nanotube A The length is 10 to 20 times the length of the carbon nanotube B. The method for preparing mixed polyether polyol is S1; the method for preparing polyether polyol slurry is S2; the method for mixing polyether polyol slurry with polyisocyanate and reacting and foaming to form polyurethane electromagnetic shielding material is S3. The polyurethane electromagnetic shielding material obtained by the invention can simultaneously realize light weight and high shielding efficiency of the material, and meanwhile, the material has good mechanical properties.

Description

technical field [0001] The invention relates to a light-weight, high-strength, high-efficiency electromagnetic shielding material, in particular to a polyurethane foamed electromagnetic shielding material with water as a foaming agent and a preparation method thereof. Background technique [0002] In the manufacturing process of electromagnetic shielding materials, foaming materials are one of the options to meet the development trend of lightweight electromagnetic shielding materials because of their advantages of light specific gravity, low cost, easy processing and molding, outstanding mechanical properties, and convenient construction. Foaming methods such as supercritical carbon dioxide foaming and phase separation foaming have problems such as high energy consumption and serious pollution. The polyurethane foam material with water as the foaming agent has the advantages of low energy consumption and environmental protection, but there are also problems such as uneven c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08K3/04C08J9/08H05K9/00
CPCC08G18/48C08G18/4804C08J9/08C08J2203/02C08J2375/08C08K2201/001C08K3/041H05K9/0083
Inventor 丁运生桑国龙徐佩孙晓红何小通
Owner HEFEI UNIV OF TECH
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