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Electromagnetic shielding film and preparation method thereof

An electromagnetic shielding film, soft magnetic technology, applied in magnetic field/electric field shielding, chemical instruments and methods, crosstalk/noise/electromagnetic interference reduction (etc.) question

Pending Publication Date: 2022-03-25
SUZHOU FINESET MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the water-based adhesives for EMI bonding on the market are polyurethane type, and the price is relatively high. At the same time, because polyurethane is easily hydrolyzed, there are problems with the aging performance of the corresponding EMI film in high temperature and high humidity environments.
In contrast, polyacrylate emulsions are cheap and have excellent aging properties, but there are few such products on the market

Method used

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  • Electromagnetic shielding film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Preparation of polyacrylate emulsion A

[0027] Pre-emulsion A preparation:

[0028] Add deionized water (145.7g) and emulsifier DS-4 (10.87g) into a 1000mL three-necked flask, stir well, then add isooctyl acrylate (126g) and methyl methacrylate (92.25g) under vigorous stirring , acrylic acid (6.75 g) and 1,6-hexanediol diacrylate (2.25 g) to give pre-emulsion A.

[0029] Emulsion A preparation:

[0030] Add deionized water (75g) and emulsifier DS-4 (1.63g) into a 1000mL three-necked flask, stir well, then add isooctyl acrylate (14g), methyl methacrylate (10.25g), Acrylic acid (0.75g) and 1,6-hexanediol diacrylate (0.25g), raise the temperature to 80°C, add ammonium persulfate (0.2g), dissolve 0.3g of ammonium persulfate in 12.5g of water After half an hour at 80°C, start to add the above-mentioned ammonium sulfate aqueous solution and pre-emulsion A dropwise, control the dripping in 150 minutes, and then continue to stir and react at 80°C for 1 hour to obtain emu...

Embodiment 2

[0036] 1) Preparation of polyacrylate emulsion B

[0037] Pre-emulsion B preparation:

[0038] Add deionized water (145.7g) and emulsifier DS-4 (10.87g) into a 1000mL three-necked flask, stir well, then add isooctyl acrylate (150.75g), methyl methacrylate (67.50g ), acrylic acid (6.75g) and 1,6-hexanediol diacrylate (2.25g) to obtain pre-emulsion B;

[0039] Emulsion B preparation:

[0040] Add deionized water (75g) and emulsifier DS-4 (1.63g) into a 1000mL three-necked flask, stir well, then add isooctyl acrylate (16.75g) and methyl methacrylate (7.5g) under vigorous stirring , Acrylic acid (0.75g) and hexanediol diacrylate (0.25g), raise the temperature to 80°C, add ammonium persulfate (0.2g), dissolve 0.3g of ammonium persulfate in 12.5g of water, after half an hour At 80°C, the above-mentioned ammonium sulfate aqueous solution and pre-emulsion B were added dropwise, and the dripping was completed within 150 minutes, and then the stirring reaction was continued at 80°C f...

Embodiment 3

[0045] 1) Preparation of polyacrylate emulsion C

[0046] Pre-emulsion C preparation:

[0047]Except that the addition of 1,6-hexanediol diacrylate is adjusted to 4.5g, the rest is the same as the preparation method of pre-emulsion A.

[0048] Emulsion C preparation:

[0049] Except for using pre-emulsion C and adjusting the addition amount of 1,6-hexanediol diacrylate to 0.5 g, the rest is the same as that of emulsion A.

[0050] 2) Preparation of EMI film C:

[0051] It was prepared in the same way as EMI Membrane A except that Emulsion C was used.

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Abstract

The invention discloses an electromagnetic shielding film and a preparation method thereof, the electromagnetic shielding film comprises the following raw materials: polyacrylate emulsion, a diluent, ammonia water, a thickening agent, a defoaming agent, a wetting agent and soft magnetic powder, the polyacrylate emulsion and the soft magnetic powder are added according to a solid-to-solid mass ratio of 1: 9, and the diluent is a diluent. The glass transition temperature of the polyacrylate emulsion is not higher than-15 DEG C, and the phase angle at 120 DEG C and 0.1 Hz is less than 15 DEG C. The magnetic conductivity of the electromagnetic shielding film adopting the formula can reach 105H / m or above under the frequency of 3MHz.

Description

technical field [0001] The invention relates to an electromagnetic shielding material, in particular to an electromagnetic shielding film and a preparation method thereof. Background technique [0002] In electronic devices, due to the low voltage and low power consumption performance of the circuit itself, the ability of the circuit itself to resist electromagnetic interference (EMI) is significantly reduced. Plating anti-EMI materials on the product shell can not only protect the product from the influence of external EMI, but also reduce its own interference to the outside world. The EU 89 / 336 / EEC (EMC) standard has clearly pointed out that electronic products must be plated on the inner wall of the product shell. On or covered with anti-EMI material. [0003] An important EMI material on the market is EMI film. In this material, soft magnetic powder, such as sendust powder, plays the role of electronic shielding. In addition, it is necessary to adhere the soft magnetic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00H05K1/02B32B27/36B32B27/28B32B27/34B32B9/00B32B9/04B32B33/00B32B3/08B32B37/00B32B38/00
CPCH05K9/0083H05K9/0081H05K1/0216B32B27/36B32B27/281B32B27/285B32B27/34B32B27/365B32B27/065B32B5/18B32B33/00B32B3/085B32B37/00B32B38/00H05K2201/0715H05K2201/05B32B2307/212B32B2266/04B32B2255/28B32B2255/10B32B2255/26B32B2307/202B32B2307/206B32B2457/00B32B2037/243
Inventor 陈苏明杨春强
Owner SUZHOU FINESET MATERIAL TECH CO LTD