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Composite material with EMI shielding properties and process to produce it

專利號
US11889671B2
公開日期
2024-01-30
申請人
TOTALENERGIES ONETECH; CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS); UNIVERSITé CLAUDE BERNARD LYON 1 (UCBL)（FR Courbevoie FR Paris FR Villeurbanne）
發(fā)明人
Olivier Lhost; Yves Trolez; Anatoli Serghei; Hubert Lecocq; Philippe Cassagnau
IPC分類
H05K9/00; C08J3/20; C08K5/09; C08K5/20; C08K9/02
技術(shù)領(lǐng)域
wt,resin,composite,fibres,at,mi2,from,min,shielding,polymer
地域： Courbevoie

摘要

The disclosure provides for a composite material suitable for use as EMI shielding material, remarkable in that it comprises a component A being a polymer resin being at least one amorphous polymer resin and/or at least one semi-crystalline polymer resin selected from polyethylene resin and/or polypropylene resin; from 15.0 to 60.0 wt. % of component B being at least one metal-coated particle based on the total weight of the composite material; and from 0.5 to 5.0 wt. % of component C being one or more dispersants based on the total weight of the composite material; wherein one or more dispersants are selected from fatty acids, fatty acid derivatives, ethylene bis stearamide, functionalized waxes, maleic anhydride-grafted polymers and any mixture thereof; wherein the blend of components A, B and C shows a density ranging from 0.8 to 2.0 g/cc. A process to produce such composite material is also described as well as an EMI shield article made from such composite material and the use of such composite material in an EMO shield article.

說明書

At 5 vol. % of fibre (FIG. 2), the addition of stearic acid slightly increases the shielding but it remains very weak under the 5 dB. At 20 vol. % of fibre (FIG. 3), the addition of stearic acid also increases the shielding which goes from 65 to 70 dB at low frequency. At high frequency (>100 MHz), an impressive maximum value of 97 dB is reached at 300 MHz. For the 10 vol. % composite of silver glass fibres (FIG. 4), the addition of 2 vol. % stearic acid increases the shielding from 40 to 50 dB at low frequency. Also, the high-frequency shielding, instead of decreasing, increases and reaches a maximum value of 64 dB at 3 GHz. Adding stearic acid additional to 4 vol. % is harmful to the shielding, suggesting that there is an optimal amount of stearic acid.

These results show the great potential of PP composites—silver glass fibres and the positive effect of adding stearic acid. The target shielding of 40 dB at 1 mm sample thickness is reached and even exceeded from 10 vol. % of fibre with and without stearic acid and it can be expected to reach it for lower fibre concentrations in the presence of stearic acid. The great advantage of these composites is their low density due to the low concentration of fibres necessary to obtain a high shielding value and the low density of the fibres. Indeed, the density of the composite for 10 vol. % of fiber is equal to 1.09 g/cc and equal to 1.28 g/cc for 20 vol. % of fibre.

The effect of the stearic acid concentration was further studied, the results are provided in FIG. 5, the content of fibres was 10 vol. % the thickness of the plate was 1 mm, and in FIGS. 6 and 7 wherein the content of fibres was 15 vol. %.

權(quán)利要求

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