Advantages of nanoscale catalysts

2021-11-10   Pageview:293

Nanocatalysts are catalysts in which the active components (e.g. precious metals) are dispersed on a carrier at the nanometer scale, and the active components of the catalyst are exposed to as much gas as possible, so that the contact opportunities between the two are greatly increased, and such catalysts generally perform more superiorly.

 

 

 

 

 

 

 

 

 

 

 

 

When the coating is applied to the last topcoat, and the topcoat has not been cured, the anti-slip agent particles are freely sprayed on the paint film, or the spray gun is used to press the wet film with mechanical force. After the coating is cured , To contain the anti-skid agent particles, thereby obtaining a non-slip surface.
This construction method is simple and easy to implement, and is often used in coatings, but the distribution of anti-slip agent particles is difficult to be uniform. The cross-section of the non-slip coating film obtained by directly adding the method,

Schematic diagram of the cross-sectional structure of the non-slip coating film obtained by the direct addition method after wear 0 a substrate; 1 a primer; 2 a coating film; 3, 5, 7 a non-slip agent particle; 8 a broken particle
Particles 4 and 6 have been lost, while smaller broken particles 8 are stored in cracks and cavities. This makes the coating film lose part of its non-slip properties, and these cracks and cavities can contain the dust and dirt falling on the surface, which contaminates the surface of the coating film.

In order to avoid the contaminated surface of the coating film produced by the direct adding method, the sealing layer method is applied with a layer of sealing film 9 after the direct adding method is applied and cured. Figures 13-19 are schematic diagrams of the cross-sectional structure of the non-slip coating film coated with a closed layer.
This coating method covers all the anti-slip agent particles, so that particles 4 and 6 can be retained, filling all cracks and cavities, and avoiding surface contamination. But its disadvantage is that it greatly loses the main task of the anti-slip agent-to impart anti-slip properties to the coating film.

The mixed method anti-skid agent particles are pre-wetted with the coating base material and mixed into the coating to form a flowable component. When the film is formed, the coating is cured over time, and the internal external lubricant anti-skid agent particles are connected by the cured intermediate film layer. The cross-sectional structure of the non-slip coating film obtained by the hybrid method.

Schematic diagram of the cross-sectional structure of the mixed method anti-skid coating film 0 a substrate; 1 a primer; 2 an anti-slip agent particle; 3 a coating layer

The appearance of the film is approximately equal to the appearance of the raised particles (with a slight round and slightly smooth). Many thin layers of adjacent particles are connected together to produce the adhesion of the anti-skid agent particles to the primer. The added anti-slip agent particles can also be stacked on each other to further add a relief type to improve the anti-slip effect.

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