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Composite foam film and preparation method thereof

A composite foam and polymer technology, applied in electrical components, magnetic field/electric field shielding, etc., can solve the problems of poor conductivity, poor conductivity and dispersion of carbon black, and large amount of raw materials added, and achieve excellent conductivity and electromagnetic shielding performance. , The electrical conductivity and electromagnetic shielding performance are stable, and the effect of improving the electrical conductivity and electromagnetic shielding performance

Pending Publication Date: 2019-10-22
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene is expensive, has poor conductivity, and carbon black has poor conductivity and dispersion, and it is easy to agglomerate and has a large amount of addition.
[0004] The invention patent with the application number CN201910088786.X discloses a preparation method of a low-reflection and high-shielding water-based polyurethane electromagnetic shielding composite foam. The water-based polyurethane / graphene-loaded iron-cobalt / expanded microsphere-loaded silver electromagnetic shielding composite foam is prepared, which can Improve the electrical conductivity and electromagnetic shielding performance of composite foam to a certain extent, but the operation process is complicated, the amount of raw materials added is large, and the process requirements are high, which limits the industrial application
It has been reported that polyimide is filled with silver nanowires, and silver nanowire hybrid polyimide foam is prepared by liquid phase foaming method, which has high electromagnetic shielding performance, but the preparation method is complicated and the process is harsh (Ma Jingjing , Zhan Maosheng; 2014)
The invention patent with the application number CN201510748263.5 discloses a new type of polyimide / silver electromagnetic shielding foam and its preparation method. The polyimide foam modified by silver nanoparticles is introduced to improve the polyimide foam Reflectivity and conductivity, but this method is complicated to operate, the process requirements are strict, and the modification efficiency of silver particles is uncontrollable

Method used

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  • Composite foam film and preparation method thereof
  • Composite foam film and preparation method thereof
  • Composite foam film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation of polyurethane (PU) foam film specifically comprises the following steps:

[0043] Dissolve PU in DMF and stir magnetically at 600r / min for 12 hours to prepare a solution with a PU mass concentration of 1% by weight; then take the resulting solution and solidify it with a polytetrafluoroethylene template to form a film in water for 6 hours. Wet samples were obtained after changing the water for the first time, and polyurethane foam membranes were obtained at -40°C with a pressure of 30Pa in a freeze dryer for 48 hours.

[0044] The difference between Embodiment 2-5 and Embodiment 1 lies in that the concentration of PU is different, and other steps are the same as Embodiment 1, and will not be repeated here.

[0045] The performance parameter data of Examples 1-5 are shown in Table 1.

[0046] Table 1

[0047] Example PU concentration (wt%) Solubility Film forming Average thickness mm Mass (mg / cm2) Example 1 1 soluble Unab...

Embodiment 6

[0051] The preparation method of silver nanowire / polyurethane composite foam film specifically comprises the following steps:

[0052] S1. Preparation of polyurethane solution: dissolve PU in DMF and stir magnetically at 600 r / min for 12 hours to prepare a solution with a mass concentration of PU of 15 wt %;

[0053] S2, preparation of silver nanowires;

[0054] S3, the preparation of silver nanowire / polyurethane composite foam film: get the silver nanowire solution that the concentration of silver nanowire is 0.1wt%, disperse in DMF and add the solution that PU mass concentration is 15wt% to dissolve and stir to obtain uniform colloid after 8 hours, Then pour the mixed solution into the polytetrafluoroethylene template and place it in deionized water for 6 hours, and change the water repeatedly 3 times in the morning, middle and evening to remove the solute DMF, and finally dry it in a freeze dryer to obtain a silver nanowire / polyurethane composite. foam film.

Embodiment 11

[0069] The preparation method of silver nanowire / polyacrylonitrile composite foam film specifically comprises the following steps:

[0070] S1. Preparation of polyacrylonitrile solution: dissolve polyacrylonitrile in tetrahydrofuran (THF) and stir magnetically at 500 r / min for 14 hours to prepare a solution with a mass concentration of polyacrylonitrile of 15 wt %;

[0071] S2, preparation of silver nanowires;

[0072] S3, preparation of silver nanowire / polyacrylonitrile composite foam film: take the silver nanowire aqueous solution whose concentration of silver nanowire is 0.86wt% and disperse in THF and add the solution that the mass concentration of polyacrylonitrile is 15wt% to dissolve and stir for 8 hours Obtain a homogeneous colloid, then pour the mixed solution into a polytetrafluoroethylene template and place it in deionized water for 6 hours, change the water repeatedly in the morning, middle, and evening to remove the solute THF, and finally dry it in a freeze dryer...

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Abstract

The invention discloses a composite foam film and a preparation method thereof. Nano-particles are used as a filler, a polymer is used as a base material, the nano-particles are dispersed in a solution of the polymer, and then curing film formation and freeze-drying treatments are carried out to prepare the nano-particle / polymer composite foam film with a light, soft and porous structure and an electromagnetic shielding property. The addition of the nanoparticles increases the pore size of the composite foam film, improves the conductive pathway of the composite foam film and significantly improve the electrical conductivity and the electromagnetic shielding property of the composite foam. The composite foam film prepared in the invention has a great application scenario in the field of electromagnetic shielding.

Description

technical field [0001] The invention relates to the field of functional composite materials, in particular to a composite foam film and a preparation method thereof. Background technique [0002] With the wide application of electronic and electrical products, problems such as electromagnetic radiation, electromagnetic pollution, and electromagnetic interference have followed, which not only affect the normal operation of electronic equipment, but also electromagnetic radiation is ubiquitous and extremely penetrating, which is also harmful to human health. Therefore, high-performance electromagnetic shielding materials have become a key technology to solve electromagnetic wave pollution. Compared with traditional metal electromagnetic shielding materials, polymer electromagnetic shielding materials are more in line with the requirements of lightweight electromagnetic shielding materials in the future due to their advantages such as light weight, softness, corrosion resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L75/04C08K3/08C08L33/20C08L79/08C08K3/01H05K9/00
CPCC08J5/18C08J2333/20C08J2375/04C08J2379/08C08K2003/0806C08K2003/085C08K2201/001C08K3/01H05K9/0083
Inventor 陆莹王栋李沐芳梅涛罗梦颖程莹
Owner WUHAN TEXTILE UNIV
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