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Nano Color Paste (Ⅰ)

Nano Color Paste (Ⅰ)

  • April 20,2020.

Nano Color Paste ()

-- PUHLER nano grinding technology exchange

Author: LiMeng Lei.

(Germany PUHLER Group, Puhler International Holding Group-PUHLER (Guangdong) Smart Nano Technology Co.,Ltd - General Manager)

Abstract: Nanotechnology is an important technology field in the development of science and technology in this century. Nanotechnology will create another wave of technological innovation and industrial revolution. Its application field is very wide, covering coating, electronic industry, optoelectronic industry, medicine and chemical industry, chemical fiber industry, building material industry, metal industry, basic industry, inkjet printing ink, chip polishing liquid, electronic ceramics, cell crushing, cosmetics, pharmaceuticals, textiles, inkjet ink, biological, pharmaceutical, metal nanomaterials, etc...Regardless of its application field, the materials required are sub-micron or nanoscale materials. How to obtain nano-scale powders and how to disperse nano-scale materials into their final products has become a common research topic in production, economy and academia. This article will discuss in detail how to obtain nano-powder grinding and how to disperse nano-materials into its final product technology.

Key words: Grinding, Dispersing, Specific energy, Grinding media, LEIMIX PHN Nano Bead mill

1 - Current situation and development of nano-scale dispersing and grinding technology

1.1 Bottom up & Top down

With the light weight, thin and short of 3C products, and the white-hot of nanometer fineness materials' application, how to apply the ultra-fine grinding technology to the manufacture and dispersing grinding of nanometer materials has become an important topic at present.

There are two ways to get the nano powder. One is bottom up manufacturing method of chemical processes, such as chemical deposition, sol-gel... The other one is the physical method, which changes the powder particles from big down to small (top down), such as mechanical ball grinding, chemical method, physical method...etc.

The manufacturing cost of the Bottom Up method is quite high, and it is not easy to scale up, and the particle size distribution is wide. So far, the physical mechanical grinding (Top Down) method is the main way to obtain nano-scale powders. The Top Down method is easier to obtain nano-powders with smaller particle size distribution, at the same time the production cost is relatively low, the parameters are easy to control, and the parameters obtained by the R & D experimental machine are scaled up to the mass production machine. The Top Down method can only grind to 30 nm at present, but it already can meet the needs of the industry.

1.2 Dry grinding & Wet grinding

For nano powder manufacturers, it is expected to produce the final nanometer powder by dry grinding. However, if the powder is grinded mechanically, the temperature of the powder will rise rapidly due to a large amount of energy input during the grinding process, and when the particles are fine, how to solve explosion-proof problem is difficult to control. So in general, the particle size of dry grinding can only be grinded to 5μm. If the particle size is to be less than 5μm, you should use wet grinding.

Wet grinding is to mix nano powder with appropriate solvent and make appropriate materials. In order to avoid the phenomenon of powder coagulation in the grinding process, it is necessary to add appropriate dispersant or auxiliary agent as grinding aid. If the final nanoscale product wanted is powder rather than slurry, it is necessary to consider how to filter the large particles in the slurry and how to dry the filtered slurry to obtain nanoscale powder.

1.3 Grinding or Dispersing

As the name, grinding is defined as the use of shear force, friction, or impactforce to grind powder from large particles into small particles.

Dispersing is the nano powder is coated with the added solvent, auxiliary agent, dispersant, resin...etc. to achieve the goal of separating, wetting, distributing, and stabilizing the particles.

(To be continued)

© Copyright: 2021 PUHLER (Guangdong)Smart Nano Technology Co.,Ltd. All Rights Reserved.

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