The main influencing factors of leveling
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1. Surface tension gradient ------ liquid ------ air interface
● Surface tension gradients of the inner and outer layers cause turbulence
● Elimination of surface tension gradient is the key to obtain a flat surface
2. Surface tension ------ liquid ------ solid interface
Lower surface tension than the substrate, allowing the coating to have better substrate wetting
● Reduce the surface tension of the coating to reduce the attractive force between the molecules on the surface, thereby promoting better flow.
