Electromagnetic shielding coating material and preparation method thereof

A coating material and electromagnetic shielding technology, applied in conductive coatings, magnetic field/electric field shielding, coatings, etc., can solve the problems of low performance stability, large content, and non-environmental protection, and achieve high dispersion stability and film formation speed Fast, low-cost results

Active Publication Date: 2018-01-12
BEIJING DREAM INK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical purpose of the present invention is: 1. Solve the limitation that the frequency range of traditional electromagnetic shielding coating is limited, and can only have a good use effect below 1.5 GHz, and improve the existing electromagnetic shielding coating material with high price and stable performance 2. Solve the problems that traditional electromagnetic shielding coating materials contain a lot of solvents, are not environmentally friendly, have low construction safety, and have fire and explosion hazards

Method used

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  • Electromagnetic shielding coating material and preparation method thereof
  • Electromagnetic shielding coating material and preparation method thereof
  • Electromagnetic shielding coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The formula composition of the environment-friendly high-performance liquid metal electromagnetic shielding coating material is shown in the following table:

[0047]

[0048] The preparation process of the present embodiment coating material is:

[0049] Step 1: The liquid metal raw materials (elemental gallium and elemental indium) are respectively subjected to reduction treatment in a hydrogen atmosphere using a reduction furnace to remove oxides on the surface of the raw materials. Sampling and weighing the reduced raw materials in proportion, put them together in a vacuum melting furnace for smelting. The molten alloy liquid is poured into ingots in a vacuum furnace.

[0050] Step 2: Weigh the required above-mentioned liquid metal alloy, under inert gas protection conditions, heat the liquid metal element or alloy to above the melting point (70°C), and stir for 50 minutes at 800r / min using an overhead disperser.

[0051] Step 3: Under inert gas protection cond...

Embodiment 2

[0055] In this embodiment, the conductive filler adopts copper powder with an average particle diameter of 300nm, and the magnetic field shielding material adopts nickel powder with an average particle diameter of 500nm. Other ingredients and preparation are the same as in Example 1.

Embodiment 3

[0057] The formula composition of the environment-friendly high-performance liquid metal electromagnetic shielding coating material is shown in the following table:

[0058]

[0059] In the preparation process of the coating material of this embodiment,

[0060] Step 1: The elemental liquid metal raw materials (tin powder and bismuth powder) are respectively reduced by a reduction furnace in a carbon monoxide gas environment to remove oxides on the surface of the raw materials. Sampling and weighing the reduced raw materials in proportion, put them into a vacuum melting furnace for smelting. The smelted alloy liquid is filled into containers for standby use.

[0061] Step 2: Weigh the required above-mentioned liquid metal alloy, heat the liquid metal to the melting point (130°C) under the protection of inert gas, and stir for 50 min at 800 r / min with an overhead disperser.

[0062] Other operations are the same as in Example 1.

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Abstract

The invention provides an electromagnetic shielding coating material. The electromagnetic shielding coating material comprises 40-70% of liquid metal, 10-40% of a conductive filler, 5-15% of a magnetic shielding filler, 0.5-2% of a coupling agent, 1-10% of a binder, 0.5-2% of a toughening material and 0.5-2% of a wetting dispersing agent, wherein the liquid metal is low-melting-point metal with the melting point of 300 DEG C or below or a conductive nanofluid formed by mixing low-melting-point metal nanoparticles with a fluid dispersant. For the first time, the concept of taking the liquid metal as a conductive auxiliary binder and a conductive auxiliary flow aid is put forward and implemented, and the liquid metal replaces a non-conductive solvent and a non-conductive binder to form the electromagnetic shielding coating material system. Besides, the electromagnetic shielding coating material neither contains any toxic or harmful substances nor produce any volatile organics, is high infilm forming speed, has the characteristics of being safe and environmentally friendly, convenient to construct and low in cost, and can be widely applied to a plurality of fields including militaryscience, electronics, aerospace, buildings and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, in particular to an electromagnetic shielding coating material and a preparation method thereof. Background technique [0002] With the rapid development of modern electronic industry, wireless communication and digital technology, all kinds of electronic and electrical equipment have gradually evolved from being mainly concentrated in military and special industrial fields to being widely used in various fields closely related to people's daily life, such as Radio and television, communication and navigation, power facilities, scientific research, medical high-frequency equipment and various household appliances, these equipment and products will produce electromagnetic radiation to varying degrees. Electromagnetic radiation has become another major public hazard after noise pollution, air pollution, water pollution, and solid waste pollution, and this hazard often causes greater lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/24C09D1/00C09D7/61C09D7/63C09D7/65D21H19/06H05K9/00
CPCC09D1/00C09D5/24C09D7/61C09D7/63C09D7/65D21H19/06H05K9/00
Inventor 董仕晋白安洋汪鸿章于洋刘静
Owner BEIJING DREAM INK TECH CO LTD
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