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Water-based electromagnetic shielding coating material and preparation method thereof

A technology of electromagnetic shielding and coating materials, which is applied in the direction of conductive coatings and coatings, and can solve the problems of conductive filler dispersion interface interaction and other problems

Active Publication Date: 2021-05-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a water-based electromagnetic shielding coating material and its preparation method, which solves the balance problem of conductive filler dispersion and interfacial interaction in the preparation process, and finally obtains a material with high mechanical properties. Improved water-based electromagnetic shielding coating material

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  • Water-based electromagnetic shielding coating material and preparation method thereof
  • Water-based electromagnetic shielding coating material and preparation method thereof
  • Water-based electromagnetic shielding coating material and preparation method thereof

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preparation example Construction

[0034] The invention discloses a water-based electromagnetic shielding coating material and a preparation method thereof whose mechanical properties are enhanced by adjusting pH, the steps are as follows:

[0035](1) Utilizing the self-polymerization reaction of dopamine hydrochloride to modify the nano-carbon material to prepare polydopamine-modified nano-carbon material;

[0036] (2) Then the polydopamine-modified nano-carbon material prepared in step (1) is dispersed in water to prepare a dispersion of a certain concentration, and a small amount of dispersion is blended with an aqueous anionic polyacrylate emulsion to obtain a mixed solution. The pH value of the resulting mixed solution, observe and record the pH value M at which the complex system appears to be agglomerated;

[0037] (3) Adjust the pH value of the aqueous anionic polyacrylate emulsion and the polydopamine-modified nano-carbon material dispersion with a strong acid solution or a strong alkali solution, unti...

Embodiment 1

[0042] Preparation of water-based electromagnetic shielding coating material with enhanced mechanical properties by adjusting pH:

[0043] (1) Add 0.25g dopamine hydrochloride in 150mL Tris buffer and 50mL ethanol at room temperature, utilize its self-polymerization reaction to modify 0.5g graphene nanosheets under weakly alkaline conditions (pH value=8.5), react After 24 hours, filter with suction and rinse with water to prepare polydopamine-modified graphene nanosheets. Then the polydopamine-modified graphene nanosheets were dispersed in 30g water by high-speed shearing to make a dispersion with a concentration of 25mg / g, the shear rate was 5000rpm, and the time was 10 minutes;

[0044] (2) Get the aqueous dispersion of 1g polydopamine-modified graphene nanosheets and 5g anionic polyacrylate emulsion Yanbang 141 to blend under magnetic stirring, and adjust the pH value with dilute sulfuric acid and sodium hydroxide solution to obtain the composite system reunited The pH is ...

Embodiment 2

[0050] Preparation of water-based electromagnetic shielding coating material with enhanced mechanical properties by adjusting pH:

[0051] (1) Add 0.5 g of dopamine hydrochloride to 300 mL of Tris buffer and 100 mL of ethanol at room temperature, and use its self-polymerization reaction to modify 2.5 g of carbon nanotubes under weakly alkaline conditions (pH value = 8.5). Reaction 24 After one hour, filter with suction and rinse with water to prepare polydopamine-modified carbon nanotubes. Then polydopamine-modified carbon nanotubes were dispersed in 197g of water by high-speed shearing to make a dispersion with a concentration of 15mg / g, the shear rate was 5000rpm, and the time was 10 minutes;

[0052] (2) Take 1g of the water dispersion of polydopamine-modified carbon nanotubes and 5g of anionic polyacrylate emulsion Mage AR-1053 to blend under magnetic stirring, and adjust the pH value with dilute sulfuric acid and sodium hydroxide solution to obtain a composite system aggl...

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Abstract

The invention discloses a water-based electromagnetic shielding coating material and a preparation method thereof, and belongs to the technical field of water-based coating preparation. A nano carbon material is endowed with water dispersibility by modifying the nano carbon material with polydopamine, the pH values of a polydopamine modified nano carbon material filler and a water-based anionic polyacrylate emulsion are respectively adjusted, and the polydopamine modified nano carbon material filler and the water-based anionic polyacrylate emulsion are blended, compounded and applied by coating to obtain the water-based electromagnetic shielding coating material with the mechanical property enhanced by adjusting the pH value. According to the method, the pH value of a formed film is adjusted, and the ionized phenolic hydroxyl group on the polydopamine is promoted to be protonated again by utilizing the natural reduction of the pH value during water evaporation, so that the interaction between the polydopamine modified nano carbon material and polyacrylate is induced to be converted from electrostatic repulsion to hydrogen-bond interaction, the contradiction between filler dispersity and interface interaction in the existing scheme is solved, and the mechanical property of the water-based electromagnetic shielding coating material is enhanced.

Description

technical field [0001] The invention belongs to the technical field of water-based coating preparation, and relates to a water-based electromagnetic shielding coating material and a preparation method thereof. Background technique [0002] With the extensive use of communication equipment, electromagnetic pollution is becoming more and more serious, and seriously endangers human health and equipment operation. Therefore, water-based electromagnetic shielding coatings are widely used in the field of anti-electromagnetic interference for computer, mobile phone, precision instruments, medical equipment and other product shells. New carbon materials such as graphene and carbon nanotubes are very suitable as conductive fillers for water-based electromagnetic shielding coating materials due to their low density and good electrical conductivity. However, due to the addition of a large amount of conductive fillers, the mechanical properties of the composite coating are greatly redu...

Claims

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Application Information

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IPC IPC(8): C09D133/04C09D5/24C09D7/62C09D7/61
CPCC08K2003/309C08K2201/001C08K2201/011C09D5/24C09D133/04C09D7/61C09D7/62C09D7/70C08K9/08C08K7/00C08K3/042C08K3/041C08K3/22C08K3/30
Inventor 马建中卫林峰张文博
Owner SHAANXI UNIV OF SCI & TECH
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