What parameters of resin determine coating gloss?

Question:

What parameters of the resin determine the gloss of the film? Some people say that it is solid content, some people say it is OH value. So, what is the most important determinant of gloss?
Answer:

There are many parameters that determine the gloss of the paint film.
The saturation of the resin: that is, its monomer structure, this index determines the absorption rate of light by the resin. For example, it is reflected that the monomer containing a benzene ring is lower in brightness than the saturated monomer.
Polarity of the resin: The monomer structure also affects the polarity of the resin, which affects its surface tension and produces a surface phenomenon like fish orange peel, which affects gloss.
Molecular Weight and Tg: These two indicators determine viscosity, ie, leveling. The better the leveling, the higher the gloss.
Reactivity of the resin: The rapid occurrence of the crosslinking reaction is not conducive to leveling, thereby affecting the gloss.
Particle size of the emulsion: If it is an resin emulsion, the particle size of the emulsion, the filming effect will also affect the gloss.

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