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Composite pressure-sensitive adhesive with orientation structure and electromagnetic shielding function and preparation method thereof

A composite pressure-sensitive adhesive, electromagnetic shielding technology, applied in conductive adhesives, pressure-sensitive films/sheets, film/sheet-like adhesives, etc. Path, low price, easy to paste effect

Active Publication Date: 2022-02-18
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method requires more experimental raw materials, and the process is complicated

Method used

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  • Composite pressure-sensitive adhesive with orientation structure and electromagnetic shielding function and preparation method thereof
  • Composite pressure-sensitive adhesive with orientation structure and electromagnetic shielding function and preparation method thereof
  • Composite pressure-sensitive adhesive with orientation structure and electromagnetic shielding function and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh two portions of 45.0 g flake nickel powder with an average sheet diameter of 22.0 μm and 100.0 g of acrylate pressure-sensitive adhesive with a solid content of 45.0 wt.%, respectively, and put them into a single-necked flask. At room temperature, mix them uniformly by mechanical stirring at a speed of 150rpm. After stirring for 1 hour, two parts of mixed solutions S1 and S3 are obtained; weigh a part of 22.5g chain-shaped nickel powder with an average chain length of Flaky nickel powder with a sheet diameter of 22.0 μm and 100.0 g of acrylate pressure-sensitive adhesive with a solid content of 45.0 wt. % were put into a single-necked flask. At room temperature, they were mixed uniformly by mechanical stirring at a rotation speed of 150 rpm, and stirred for 1 h to obtain a mixed solution S2.

[0033] (2) Put the mixtures S1, S2 and S3 into a vacuum degassing machine for 30 minutes.

[0034] (3) Put the mixed liquid S1 into the casting box of the casting machi...

Embodiment 2

[0039] The method is the same as in Example 1, except that the average chain length of the chain-shaped nickel powder in (1) is adjusted from 16.0 μm to 57.0 μm. The electromagnetic shielding performance of the composite pressure-sensitive adhesive was tested at a frequency of 8.2-12.4GHz by using the waveguide method with a vector network analyzer. The electromagnetic shielding effectiveness of the composite pressure-sensitive adhesive can reach 33.45dB, the absorption loss accounts for 42.15% of the total shielding effectiveness, and the peel strength is 0.63N. / mm. The properties of the materials are listed in Table 1.

Embodiment 3

[0041] The method is the same as in Example 1, except that the average chain length of the chain-shaped nickel powder in (1) is adjusted from 16.0 μm to 70.0 μm. The electromagnetic shielding performance of the composite pressure-sensitive adhesive is tested at 8.2-12.4GHz using the waveguide method by a vector network analyzer. The electromagnetic shielding effectiveness of the composite pressure-sensitive adhesive can reach 28.74dB, the absorption loss accounts for 40.71% of the total shielding effectiveness, and the peel strength is 0.59N. / mm. The properties of the materials are listed in Table 1.

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Abstract

The invention discloses a composite pressure-sensitive adhesive with an orientation structure and an electromagnetic shielding function and a preparation method thereof, and belongs to the field of preparation of electromagnetic shielding materials. The composite pressure-sensitive adhesive is prepared by adopting an external static magnetic field and a solution casting method. The composite pressure-sensitive adhesive has a three-layer structure, and the metal magnetic filler has different orientation structures in the thickness direction of each layer. The filler on the upper layer perpendicular to the base film direction is beneficial to entry of electromagnetic waves; the filler, forming a certain inclination angle with the horizontal plane, of the middle layer is beneficial to generation of a large amount of multi-reflection and scattering of electromagnetic waves; the lower layer of filler parallel to the direction of the base film can reflect electromagnetic waves into the material again. The three layers are well matched to greatly attenuate electromagnetic radiation, so that the prepared pressure-sensitive adhesive has the characteristics of high shielding effectiveness and strong absorption. In addition, the composite pressure-sensitive adhesive can be repeatedly pasted and used, and can be widely applied to the fields of flexible electronic equipment, portable and wearable electronic products and the like.

Description

technical field [0001] The present invention relates to the technical field of electromagnetic shielding composite materials, in particular, to an electromagnetic shielding function composite pressure-sensitive adhesive with an orientation structure, and a method for preparing an orientation structure electromagnetic shielding function composite pressure-sensitive adhesive by applying a static magnetic field . Background technique [0002] With the increase in the use of electronic and electrical equipment, a complex electromagnetic environment is formed. Electromagnetic interference not only causes malfunction of electrical equipment, but also may cause information leakage, erroneous operation, and damage the performance of electronic equipment. The research on electromagnetic interference shielding technology has been paid more and more attention. [0003] Polymer-based pressure-sensitive adhesives can firmly bond two materials together, are easy to use, and are inexpens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J9/02C09J7/38
CPCC09J133/04C09J9/02C09J7/385C09J2301/122C09J2301/208C09J2423/046C09J2433/00C08K2003/0862C08K7/00C08K3/08
Inventor 张扬王晨卉高晗刘帅
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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