Nano low-frequency electromagnetic shielding coating and preparation method thereof

An electromagnetic shielding coating and nanotechnology, applied in anti-corrosion coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of incompatibility with high-efficiency industrial coating, low shielding efficiency, complex processing technology, etc., and achieve low-frequency electromagnetic shielding range. Wide, fast drying, good anti-corrosion performance

Inactive Publication Date: 2020-01-21
CHENGDU PRESSTER NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the low-frequency electromagnetic shielding coatings on the market generally have defects such as low shielding efficiency, containing benzophenone solvent, expensive price, and complicated processing technology.
[0005] For example, the Chinese patent application No. 200910234257.2 discloses an electromagnetic shielding coating containing silver-coated copper powder and acrylic resin, which has a shielding effect of 50dB-60dB in the range of 700MHz-1.5GHz, but it contains dispersibility and solubility The best xylene (carcinogen), there are serious bodily harm hazards in production, processing, on-site construction and other processes
[0006] The Chinese patent application number 200910103343X discloses an electromagnetic shielding coating containing silver-coated copper powder, polyurethane emulsion and acrylic emulsion, but the drying speed is slow and does not meet the needs of efficient industrial coating

Method used

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  • Nano low-frequency electromagnetic shielding coating and preparation method thereof
  • Nano low-frequency electromagnetic shielding coating and preparation method thereof
  • Nano low-frequency electromagnetic shielding coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0023] Adopt the components and proportions shown in Table 1 respectively

[0024] The preparation methods are as follows: add the raw materials of the three formula ratios in Table 1 into three tanks according to the resin-solvent-powder process, mix evenly in a high-speed mixer, and add volatile ethanol solvent to adjust the viscosity to reach Tu 4# cup 180- After 240 seconds, the mixture is mixed and sampled for inspection, and if it is qualified, it can be filtered and packaged with a 150-mesh filter.

[0025] Spraying environment: temperature: 5-30°C, relative humidity: 30-75%.

[0026] Wet film thickness: 30~60μm.

[0027] Spray viscosity: 4# viscosity cup: 20-26 seconds.

[0028] Spraying times: once.

[0029] Maintenance environment: temperature 20±5℃, relative humidity: 50±5%, maintenance time 7 days.

[0030] The first component of the coating of table 1. embodiment 1-3 and ratio table thereof

[0031]

[0032]

Embodiment 4

[0034] The component A product obtained in Example 1-3 is proportioned with the component B product in Table 2 respectively. Components A and B were mixed evenly and placed for 10 minutes, and coated on a 1.5mm thick ABS engineering plastic plate with a coating thickness of 45μm. The indicators were tested respectively, and the results are shown in Table 3:

[0035] Table 2. Embodiment 1-3 A and B component ratio table

[0036] project Example 1 Example 2 Example 3 A:B ratio 100：:8.48 100：:8.15 100:7.8

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Abstract

The invention discloses nano low-frequency electromagnetic shielding coating and a preparation method thereof, and belongs to the technical field of coating. The coating comprises a component A and acomponent B. The component A comprises hydroxy acrylic resin, silver coated copper powder, an auxiliary agent and a combined solvent, and the component B is a curing agent. According to the coating, all the components cooperate with one another, benzene, ketone and halogen are avoided, the low-frequency electromagnetic shielding range is wide, the shielding efficiency is good within the range of 30 MHz to 1.5 GHz, the corrosion resistance is good, and good adhesive force, toughness, abrasion resistance, elasticity, acid resistance, alkali resistance, salt resistance, oil resistance, petroleumproduct resistance, benzene solvent resistance, water resistance, boiling water resistance, seawater resistance and chemical atmosphere resistance are achieved; weather resistance is high, and gloss and color retention is achieved; construction is convenient, the drying speed is high, normal curing can be achieved at 0 DEG C, and a universal construction method is adopted.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to nanometer low-frequency electromagnetic shielding coatings and a preparation method thereof. Background technique [0002] With the rapid development of technologies such as electronics and communication, electromagnetic radiation has become a new source of pollution. The World Health Organization lists electromagnetic radiation pollution as the third largest public hazard in the world, and the harm of low-frequency magnetic fields is particularly serious. The magnetic field interference generated by the low-frequency magnetic field is an important factor affecting the normal operation of other electronic and electrical equipment, and it can also have certain radiation hazards to the human body. In the civilian market, it has greatly promoted the development of professional high-performance shielding coatings with good shielding effect, convenient operation and low price. Part ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/10C09D7/62C09D7/20
CPCC08K2003/085C08K2201/011C09D5/10C09D175/04C09D7/20C09D7/62C08K9/10C08K3/08
Inventor 史险峰何静邓永胜谭勇
Owner CHENGDU PRESSTER NEW MATERIALS
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