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A kind of thermoplastic polyurethane/graphene foam material and its preparation method and application

A technology of thermoplastic polyurethane and foaming materials, applied in the direction of chemical instruments and methods, coatings, layered products, etc., can solve the problems of environmental secondary pollution, electromagnetic wave reflection enhancement, etc., to improve absorption loss, reduce weight and cost, The effect of high market application prospects

Active Publication Date: 2019-04-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current polymer shielding materials mainly achieve industrial standards (shielding effectiveness not less than 20dB) by adding high content of conductive fillers, such as literature: Adv.Funct.Mater., 2016, 26, 303-310; Carbon, 2016 , 96, 768-777; Adv. Mater. 2005, 17, 1999-2003
As a result, excessively high conductive filler greatly enhances the reflection of electromagnetic waves, causing secondary pollution to the environment

Method used

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  • A kind of thermoplastic polyurethane/graphene foam material and its preparation method and application
  • A kind of thermoplastic polyurethane/graphene foam material and its preparation method and application
  • A kind of thermoplastic polyurethane/graphene foam material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Add 0.83 g of graphene into 300 mL of DMF and ultrasonically disperse for 10 minutes to obtain a black suspension. 20 g of thermoplastic polyurethane elastomer particles were added to the suspension, stirred and dissolved at a high speed in an oil bath at 60° C. for 5 hours, and then the obtained mixed solution was poured into distilled water for precipitation. Finally, place the precipitated thermoplastic polyurethane / graphene mixture in a vacuum oven at 60°C for 48 hours, take it out and pulverize it for later use;

[0037] (2) Re-dissolve the thermoplastic polyurethane / graphene mixture in step (1) in 100mL of DMF to obtain a mixed casting solution, pour it into the scraper groove of the scraper and coat the film on a clean glass plate, scraper The thickness is set to 4mm. After completion, place it in the air with a relative humidity of 80% at normal temperature for 3 hours, then take it out and dry it in a vacuum oven at 30°C for 24 hours to obtain a thermoplas...

Embodiment 2

[0048] The materials used in this embodiment are PUG8 and PUG16 prepared in Example 1, they are bonded with PU glue in the order of graphene content from small to large to form a double-layer thermoplastic polyurethane / graphite with graphene concentration gradient vinyl foam.

Embodiment 3

[0053] The materials used in this example are PUG4 and PUG12 prepared in Example 1. They are bonded with PU glue in the order of graphene content from small to large to form a double-layer thermoplastic polyurethane / graphite with a graphene concentration gradient. vinyl foam.

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Abstract

The invention discloses a thermoplastic polyurethane / graphene foam material and a preparation method and application thereof. The thermoplastic polyurethane / graphene foam material has high electromagnetic shielding effectiveness and high wave absorbing performance. According to the method, firstly, single-layer thermoplastic polyurethane / graphene microfoam films are prepared through a phase separation method, then, the single-layer thermoplastic polyurethane / graphene microfoam films with the different graphene contents are bonded into an integrated material through glue, and therefore gradient dispersion of graphene in the thermoplastic polyurethane / graphene foam material is achieved. The gradient structure can endow the thermoplastic polyurethane / graphene foam material with good shielding effectiveness and meanwhile can greatly improve the wave absorbing performance of the material, and the prepared light thermoplastic polyurethane / graphene foam material has good application prospects in the fields of electromagnetic shielding and wave absorbing materials.

Description

technical field [0001] The invention belongs to the field of polymer-based electromagnetic shielding materials, and in particular relates to a thermoplastic polyurethane / graphene foam material and its preparation method and application. Background technique [0002] Electromagnetic interference refers to the phenomenon that harmful electromagnetic waves interfere with or cause obstacles to the normal functions of electronic devices, referred to as EMI (electromagnetic interference), which generally refers to radio waves, magnetic waves, light waves, sunspots and other natural interference from space. With the rapid development of the modern electronics industry, the number of various wireless communication systems and high-frequency electronic devices has increased sharply, resulting in the increase of electromagnetic interference and the increasingly prominent problem of electromagnetic pollution. On the one hand, electromagnetic radiation will cause serious interference to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/06C08L75/08C08K3/04C08J5/18C08J9/28B32B25/14B32B25/04B32B37/12B32B38/16
CPCB32B5/32B32B37/1284B32B38/164B32B2250/22B32B2255/102B32B2255/26B32B2266/0207B32B2307/212C08J5/18C08J9/28C08J2375/06C08J2375/08C08K3/04C08L2203/14C08L2203/16C08L2207/04C08L75/06C08L75/08
Inventor 郑文革李洋沈斌翟文涛张利华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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