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Dispersion method of nanoscale inorganic particles suitable for composite electrodeposition

A composite electrodeposition, inorganic particle technology, used in electrolytic coatings, coatings, etc., can solve the problems of complex operation, enhanced dispersion, and little consideration of particle application.

Active Publication Date: 2020-10-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, methods such as stirring, ball milling, ultrasonic dispersion, or surface modification to modify the surface of the particles to improve the dispersion effect, but this method is generally complicated to operate and high in cost, and it is easy to adversely affect the performance of the coating.
In many patents and documents, the basic principle is to increase the length of the particle surface chain segment, increase its steric hindrance effect, and the particle size is at an ideal value, but this only achieves the purpose of eliminating agglomeration and enhancing dispersion. Considering the actual application of particles in composite electrodeposition, it cannot be directly applied to the field of composite electrodeposition

Method used

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  • Dispersion method of nanoscale inorganic particles suitable for composite electrodeposition
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  • Dispersion method of nanoscale inorganic particles suitable for composite electrodeposition

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Effect test

Embodiment 1

[0048] Taking zirconia particles as an example, a kind of nano-scale inorganic particle dispersion method of the present invention is used to improve the dispersion, such as figure 1 As shown, the specific steps are as follows:

[0049] In the first step, the zirconium dioxide particles are activated to prepare zirconium dioxide (substance A) containing hydroxyl groups on the surface.

[0050] Add 600nm zirconia particles into a sulfuric acid solution with a temperature of 25° C. and a concentration of 5% by mass to activate for 10 minutes to obtain zirconia (A substance) containing hydroxyl groups on the surface;

[0051] In the second step, the zirconium dioxide containing hydroxyl groups on the surface is pre-adsorbed in the treatment solution A to prepare zirconium dioxide (substance B) containing Tween 20 long-chain groups on the surface.

[0052] The composition of treatment liquid A is 40% (weight part) Tween 20 (pre-adsorbent), 5% (weight part) yttrium sulfate (auxili...

Embodiment 2

[0068] A method for dispersing nanoscale inorganic particles, the specific steps are as follows:

[0069] In the first step, silicon carbide particles are activated to prepare silicon carbide with hydroxyl groups on the surface.

[0070] Adding 50nm silicon carbide particles to a hydrochloric acid solution with a temperature of 60°C and a mass percent concentration of 5% for 20 minutes to obtain silicon carbide with hydroxyl groups on the surface;

[0071] The second step is to pre-adsorb the silicon carbide containing hydroxyl groups on the surface in the treatment solution A to prepare silicon carbide containing hydroxyl groups and polyoxyethylene 40 long-chain groups on the surface.

[0072] The composition of treatment liquid A is 60% (weight part) polyoxyethylene 40 stearate (pre-adsorbent), 0.1% (weight part) cerium sulfate (auxiliary adsorbent), surplus is water, and pH is 7, Mix silicon carbide with hydroxyl groups on the surface and treatment solution A at a mass rat...

Embodiment 3

[0088] A method for dispersing nanoscale inorganic particles, the specific steps are as follows:

[0089] In the first step, boron nitride particles are activated to prepare boron nitride with hydroxyl groups on the surface.

[0090] adding 900nm boron nitride particles into a sulfuric acid solution with a temperature of 40°C and a concentration of 20% for 15 minutes to activate boron nitride with hydroxyl groups on the surface;

[0091] In the second step, the boron nitride containing hydroxyl groups on the surface is pre-adsorbed in the treatment solution A to prepare boron nitride containing hydroxyl groups and Tween 40 long-chain groups on the surface.

[0092] The composition of treatment liquid A is 50% (weight part) Tween 40 (pre-adsorbent), 2% (weight part) cobalt sulfate (auxiliary adsorbent), surplus is water, and pH is 6, will surface hydroxyl-containing Boron nitride and treatment solution A were mixed at a mass ratio of 100:100, and the ultrasonic treatment time ...

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Abstract

The invention discloses a dispersion method of nanoscale inorganic particles suitable for composite electrodeposition and belongs to the field of nanoscale inorganic particle dispersion treatment. According to the dispersion method, firstly, the nanoscale inorganic particles are activated, and active sites of hydroxide radicals are increased on the surfaces of the nanoscale inorganic particles; then, the nanoscale inorganic particles with the surfaces containing the hydroxide radicals are subjected to pre-adsorption treatment in treating liquid A, so that nanoscale inorganic particles with thesurfaces containing the hydroxide radicals and nonionic long-chain groups simultaneously are obtained; and next, the obtained particles are subjected to secondary adsorption treatment in treating liquid B, so that nanoscale inorganic particles with the surfaces containing the nonionic long-chain groups and anionic surfactant long chains are obtained. According to the nanoscale inorganic particleswith the surfaces containing the nonionic long-chain groups and the anionic surfactant long chains, surface Zeta potential can reach -10mv to -40mv, the dispersity is good, the nanoscale inorganic particles applied to a composite coating obtained in composite electrodeposition are uniformly deposited, and the content of the nanoscale inorganic particles reaches more than 10%.

Description

technical field [0001] The invention belongs to the field of dispersion treatment of nano-scale inorganic particles, and specifically refers to a method for dispersing and processing nano-scale inorganic particles due to the agglomeration between particles in a composite electrodeposition process. Background technique [0002] Nanomaterials have broad application value and market potential. Inorganic particles at the nanoscale exhibit many excellent properties, such as mechanical and magnetic properties, macroscopic quantum tunneling effects, and quantum size effects. This series of characteristics lead to the excellent performance of nano-scale inorganic particles in solar cells, photocatalysis and environment, functional ceramics, functional coatings and biosensors. Therefore, the application of nano-scale inorganic particles in composite electrodeposition technology is a composite material. An important research direction in the research field. [0003] Composite electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00
CPCC25D15/00
Inventor 李卫平耿楠刘慧丛陈海宁朱立群
Owner BEIHANG UNIV
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