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Flexible polyurethane-based carbon nano composite electromagnetic shielding material and preparation method thereof

An electromagnetic shielding material and carbon nanocomposite technology, applied in the field of materials, can solve the problems of heavy weight and easy corrosion of electromagnetic protection materials, and achieve the effect of light weight and corrosion resistance

Inactive Publication Date: 2020-12-25
NO 33 RES INST OF CHINA ELECTRONICS TECHNOOGY GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a flexible polyurethane-based carbon nanocomposite electromagnetic shielding material and a preparation method thereof to solve the problem that the existing electromagnetic protection materials are heavy and easy to corrode

Method used

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  • Flexible polyurethane-based carbon nano composite electromagnetic shielding material and preparation method thereof
  • Flexible polyurethane-based carbon nano composite electromagnetic shielding material and preparation method thereof
  • Flexible polyurethane-based carbon nano composite electromagnetic shielding material and preparation method thereof

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preparation example Construction

[0024] The first embodiment of the present invention provides a method for preparing a flexible polyurethane-based carbon nanocomposite electromagnetic shielding material, see figure 1 , the method includes:

[0025] S101, pretreating diisocyanate, polyol resin and chain extender;

[0026] S102. Add pre-dispersed carbon nanotubes with preset structures, flame retardants and conductive agents to the mixture of pretreated diisocyanate, polyol resin and chain extender, mix uniformly, and perform curing and molding to obtain flexible polyurethane Carbon nanocomposite electromagnetic shielding material.

[0027] The embodiment of the present invention is based on the uniform array of carbon nanotubes for polyurethane resin modification formula design, by synchronously adding flame retardants, catalysts, stabilizers, anti-aging agents, etc. to make them well dispersed in the polyurethane resin matrix, to achieve the best Mixing process treatment conditions, emphatically realize th...

specific Embodiment 1

[0045] (1) Preparation of carbon nanotubes with uniform length: Utilize CVD method, by adjusting methane gas flow rate (300~400sccm range), reaction temperature 750 ℃, reaction time 50~60min time range adjustment, catalyst Fe nano film 2nm~3nm, obtain uniform Carbon nanotubes with a length of 200-300 μm, weighing 1-3 g.

[0046] (2) Weigh (by mass parts) 200-300g of polyester polyol resin;

[0047] (3) Weigh diisocyanate TDI, 100-150g; weigh dimethylol propionic acid (DMPA) 10-20g;

[0048] (4) Weigh 10-50g of neutralizer, 300-500g of solvent water and a small amount of acetone;

[0049] (5) Weigh the flame retardant aluminum oxide hydrate and zinc oxide, 40-50g in total according to the mass ratio of 1:1; weigh 20-30g of the conductive agent;

[0050] (6) Diisocyanate and chain extender in (2) polyol resin and (3) are placed in the 1000ml flask equipped with stirrer, thermometer and reflux condenser, under N 2 Under protection, react at 80-120°C for 120-180 minutes to obta...

specific Embodiment 2

[0056] (1) Preparation of uniform length carbon nanotubes: using CVD method, by adjusting the methane gas flow rate in the range of 350sccm to 450sccm, the reaction temperature in the temperature range of 700°C to 750°C, and the reaction time of 80min to 100min, the catalyst Fe nano film is 2nm to 5nm range, the length of the arrayed carbon nanotubes is 300 μm to 400 μm, and the weight is 3 to 5 g.

[0057] (2) Weighing (in parts by mass): weigh 300-500 g of polyether polyol resin;

[0058] (3) Weigh the diisocyanate HDI, 200-300g, and weigh the small molecule chain extender TETA, 30-50g;

[0059] (4) Weigh 10-50g of neutralizing agent, 500-1000g of solvent deionized water and a small amount of acetone;

[0060] (5) Weigh 50-100g of flame retardant aluminum hydroxide and zinc oxide in total, and weigh 30-50g of silver powder conductive agent;

[0061] (6) polyol resin in (2) and diisocyanate and chain extender in (3) are placed in the 1000ml flask equipped with stirrer, ther...

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Abstract

The invention discloses a flexible polyurethane-based carbon nano composite electromagnetic shielding material and a preparation method thereof. Polyurethane resin modification formula design is conducted on the basis of uniform array type carbon nanotubes, and a flame retardant, a catalyst, a stabilizer, an anti-aging agent and the like are synchronously added and well dispersed in a polyurethaneresin matrix, the optimal mixing process treatment condition is obtained, and the uniform dispersion of the carbon nanotubes and the electromagnetic shielding function after the carbon nanotubes arecompounded with the resin matrix are realized. Metal materials are not required to be introduced, so that the material is light in weight and corrosion-resistant. Moreover, the polyurethane-based carbon nano composite electromagnetic shielding material can be used in the fields of electronic information and household appliances to effectively shield static electricity and electromagnetic radiation, especially in the frequency range of electromagnetic waves of 2GHz-18GHz.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a flexible polyurethane-based carbon nanocomposite electromagnetic shielding material and a preparation method thereof. Background technique [0002] Today, with the intensification of informatization in the information age, various electronic information equipment, systems, and various home appliances are rapidly popularized; the rapid development of urban transportation systems such as automobiles, trams, subways, and electrified railways has led to a sharp increase in electromagnetic radiation. Electromagnetic pollution has become the fourth largest pollution after water pollution, air pollution and noise pollution. Electromagnetic radiation will not only cause electromagnetic interference and electromagnetic compatibility problems of equipment and systems, but also pose potential threats to human physical and mental health. The electromagnetic waves radiated by electronic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/73C08G18/66C08G18/48C08G18/42C08K3/00C08K3/04C08K3/22H05K9/00
CPCC08G18/42C08G18/48C08G18/6659C08G18/6685C08G18/73C08G18/7614C08K3/00C08K3/22C08K3/2279C08K2003/2227C08K2003/2296C08K2201/003C08K2201/004C08K2201/011C08K3/041H05K9/0081
Inventor 李克训张捷鞠军燕白翰林贾琨刘伟
Owner NO 33 RES INST OF CHINA ELECTRONICS TECHNOOGY GRP
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