Resins are large molecular materials whose molecular mass is between 500 and 30,000. Resins that have a high molecular mass physically form a film. In low molecular masses, resins must be formed chemically to form suitable films so that large molecules are created in the polymer network system. This increase in molecular mass in the polymer system increases the elasticity, hardness and toughness of the polymer film. Also, in addition to the mechanical properties, low viscosity along with low solvent percentage is needed to make it easier to apply paint and lower the rate of solvent evaporation to help solve environmental problems.
As a result, it is very important to establish a balance between viscosity and solids percentage. Resins with low molecular mass can be used in the production of paints with a high solid percentage and a low percentage of evaporated solvent and even solvent-free systems. In this case, the formation of the color film is done chemically by means of active substances. Even if this chemical drying is done at room temperature, the act of mixing the paint with the hardener must be done before applying the paint.
2. Construction and building coatings
