Electromagnetic wave absorption sheet and preparation method thereof

• Main Authors: LI JUN, LI XIXIONG, CHEN ZHONGYAN
• Format: Patent
• Language: Chinese; English
• Published: 11.06.2021
• Subjects: CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS

The invention belongs to the field of electromagnetic protection, and discloses an electromagnetic wave absorption sheet and a preparation method thereof. The electromagnetic wave absorption sheet is prepared from the following components of soft magnetic alloy powder, thermoplastic polyurethane, a rheological additive and a solvent, and the rheological additive comprises oxidized polyethlene wax. According to the present invention, the oxidized polyethlene wax is used as the rheological additive, so that the sedimentation rate of the magnetically soft alloy powder in the slurry is obviously reduced, the electromagnetic wave absorption sheet has good film forming characteristic and good coating appearance, and an electromagnetic wave absorbing sheet product with excellent performance can be obtained. 本发明属于电磁防护领域，公开了一种电磁波吸收片及其制备方法。所述电磁波吸收片由以下组分制得：软磁合金粉、热塑性聚氨酯、流变助剂和溶剂；所述流变助剂包括有氧化聚乙烯蜡。本发明通过采用氧化聚乙烯蜡作为流变助剂，使得浆料中软磁合金粉沉降速率显著减缓，并具有良好的成膜特性，涂布外观良好，能够得到性能优良的电磁波吸收片产品。