How to achieve viscosity reducing effect of epoxy dumb powder viscosity reducing dispersant
In the industrial fields of coatings, ink and plastics, epoxy matt powder, as an important filler, is widely favored because it can give the material Matt effect. However, the addition of epoxy matt powder often leads to the increase of the viscosity of the system, which affects the processing performance and the quality of the final product. In order to solve this problem, epoxy dumb powder viscosity reducing dispersant came into being.
1、 Basic overview of viscosity reducing dispersant for epoxy matt powder
The viscosity reducing dispersant for epoxy matte powder is a kind of chemical additive specially designed to reduce the viscosity of the system containing epoxy matte powder. By optimizing the dispersion state of dumb powder particles in the system, it reduces the interaction between particles, so as to reduce the overall viscosity of the system. This dispersant usually has excellent emulsifying, dispersing and wetting properties, and can effectively improve the compatibility between the dumb powder particles and the substrate.
2、 Analysis of viscosity reduction mechanism
Dispersion
The core function of epoxy dumb powder viscosity reducing dispersant is its dispersion. It can be adsorbed on the surface of dumb powder particles to form a uniform coating layer, which can effectively prevent agglomeration and precipitation between particles. Through the effect of dispersant, the dumb powder particles are more evenly dispersed in the system, reducing the friction and resistance between particles, thus reducing the viscosity of the system.
Wetting action
Good wettability is the key to reduce the viscosity of the system. The epoxy dumb powder viscosity reducing dispersant can significantly reduce the interfacial tension between the dumb powder particles and the substrate, making the particles easier to be wetted by the substrate. The improvement of wettability is conducive to the uniform distribution of dumb powder particles in the system and further reduces the increase of viscosity.
Steric hindrance effect
The coating layer formed by epoxy dumb powder viscosity reducing dispersant on the surface of dumb powder particles also has a certain steric hindrance effect. This effect can prevent the close contact and mutual extrusion between particles, thus reducing the interaction force between particles. The existence of steric hindrance effect is helpful to maintain the low viscosity state of the system.
Chemical interaction
Some epoxy dumb powder viscosity reducing dispersants can also chemically interact with some components in the substrate to form stable chemical bonds. This chemical bonding can further enhance the compatibility between the dumb powder particles and the substrate, help to reduce the viscosity of the system and improve the overall performance of the product.
3、 Precautions for use
Select appropriate dispersant
Different kinds of epoxy dumb powder viscosity reducing dispersants have different chemical structures and performance characteristics. Before use, the appropriate type and dosage of dispersant should be selected according to the specific application scenarios and process requirements.
Fully agitate
To ensure that the dispersant can give full play to its role, it should be fully stirred after adding the dispersant. The mixing time and speed should be adjusted according to the viscosity of the system and the performance of the dispersant to achieve the best dispersion effect.
Control process conditions
When using epoxy dumb powder viscosity reducing dispersant, attention should also be paid to the control of process conditions, such as temperature, humidity, etc. These conditions have important effects on the properties of dispersant and the viscosity of the system.
4、 Conclusion
The viscosity reducing dispersant for epoxy matte powder can effectively reduce the viscosity of the system containing epoxy matte powder through its unique mechanism of dispersion, wetting and steric hindrance. In the process of use, attention should be paid to the selection of appropriate dispersant type and dosage, sufficient mixing and control of process conditions. Through scientific and reasonable use methods and strict construction management, the advantages of epoxy dumb powder viscosity reducing dispersant can be fully brought into play, and the processing performance and final quality of products can be improved.
