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Black water-based full-shading electromagnetic wave shielding coating and preparation method thereof

A technology of shielding coatings and full shading, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor shielding performance and high light transmittance of coatings, and achieve high light transmittance, low light transmittance, and prevent Effects of Electromagnetic Radiation Pollution

Inactive Publication Date: 2022-04-19
GUANGZHOU QIANSHUN IND MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of black water-based full light-shielding electromagnetic wave shielding coating and its preparation method. The coating has the advantages of low light transmittance, good anti-stickiness, strong electromagnetic wave shielding performance, etc., and can be used in various electromagnetic compatibility environments, such as communication, In the fields of IT, electric power, medical care, electronics, military industry, new energy vehicles, etc., it can prevent electromagnetic information leakage and electromagnetic radiation pollution; effectively ensure the normal operation of instruments and equipment, ensure the safety of confidential information, and protect the health of staff. There are problems with high light transmittance and poor shielding performance of technical coatings

Method used

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  • Black water-based full-shading electromagnetic wave shielding coating and preparation method thereof
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  • Black water-based full-shading electromagnetic wave shielding coating and preparation method thereof

Examples

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Embodiment 1

[0037] A black water-based full light-shielding electromagnetic wave shielding coating for conductive substrates, based on the total mass percentage of 100%, comprising the following components: 10% polyurethane-acrylic acid copolymer, 10% acrylic emulsion with a Tg lower than 20°C , Nano black paste 25%, PTFE wax dispersion 5%, wetting and dispersing agent 1.5%, thickener 1%, leveling agent 0.5%, film-forming aid 7%, water 40%.

[0038] The solid content of the polyurethane-acrylic copolymer is 33%, the minimum film-forming temperature is 27°C, and the viscosity is 500Mpa.s; the preparation method of the polyurethane-acrylic copolymer comprises the following steps:

[0039] (1) Add 69.9% polyisocyanate, 30% organic solvent and 0.1% catalyst dibutyltin dilaurate to the reaction kettle based on the total mass percentage of 100%, and heat up to 60°C after stirring evenly. Adding carboxyl-modified polycaprolactone diol to the equivalent of NCO / OH stops adding when 110:3, reacts 4...

Embodiment 2

[0056] A black water-based full light-shielding electromagnetic wave shielding coating for conductive substrates, based on the total mass percentage of 100%, comprising the following components: 5% polyurethane-acrylic acid copolymer, 20% acrylic emulsion with a Tg lower than 20°C , Nano black paste 30%, PTFE wax dispersion 10%, wetting and dispersing agent 1.5%, thickener 1%, leveling agent 0.3%, film-forming aid 5%, water 27.2%.

[0057] The preparation method of the black water-based fully light-shielding electromagnetic wave shielding coating for conductive substrates described in this embodiment is the same as that in Embodiment 1.

Embodiment 3

[0059] A black water-based full light-shielding electromagnetic wave shielding coating for conductive substrates, based on the total mass percentage of 100%, comprising the following components: 10% polyurethane-acrylic acid copolymer, 10% acrylic emulsion with a Tg lower than 20°C , Nano black paste 35%, PTFE wax dispersion 5%, wetting and dispersing agent 1.5%, thickener 1%, leveling agent 0.2%, film-forming aid 7%, water 30.3%.

[0060] The preparation method of the black water-based fully light-shielding electromagnetic wave shielding coating for conductive substrates described in this embodiment is the same as that in Embodiment 1.

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Abstract

The invention discloses a black water-based full-shading electromagnetic wave shielding coating which is coated on a conductive substrate and comprises the following components in percentage by mass: 1-20% of polyurethane-acrylic copolymer, 1-20% of acrylic emulsion, 15-35% of nano black paste, 5-10% of polytetrafluoroethylene wax dispersion, 1-1.5% of wetting dispersant, 0.1-1% of flatting agent, 5-10% of coalescing agent, 0.5-1% of thickening agent and the balance of water. The coating has the advantages of being low in light transmittance, good in after-tack resistance, high in electromagnetic wave shielding performance and the like, is applied to various electromagnetic compatibility environments, such as the fields of communication, IT, electric power, medical treatment, electronics, military industry, new energy automobiles and the like, and prevents electromagnetic information leakage and electromagnetic radiation pollution; normal work of instruments and equipment is effectively guaranteed, safety of confidential information is guaranteed, body health of workers is guaranteed, and the problems that in the prior art, paint is high in light transmittance and poor in shielding effectiveness are solved.

Description

Technical field: [0001] The invention relates to the technical field of shielding coatings, in particular to a black water-based full light-shielding electromagnetic wave shielding coating and a preparation method thereof. Background technique: [0002] At present, electromagnetic wave shielding coatings started relatively late in China, and the varieties are relatively single, and the current products are mostly used on non-metallic materials such as engineering plastics, wood, and glass fiber reinforced plastics. Coatings with high barrier properties for conductive substrates have not been well promoted and applied at present. Due to the low density of conductive substrates and large gaps, it is difficult to completely fill the conductive substrates with the shielding coatings of flexible packaging inks and conductive powders currently on the market, resulting in high light transmittance, which seriously affects the shielding performance of the substrates. Invention cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D175/16C09D133/00C09D7/65
CPCC09D1/00C09D175/16C09D133/00C09D7/65
Inventor 田耕王善
Owner GUANGZHOU QIANSHUN IND MATERIAL
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