Epoxy curing agent Knowledge Selection of film-forming additives for water-based coatings

Selection of film-forming additives for water-based coatings

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Selection of film-forming additives for water-based coatings

Similar to true solvents and co-solvents in solvent-based paints, film formation in water-based systems Auxiliaries play a similar role and can also be classified accordingly. Regarding the drying of water-based paints, there is a classic evaluation: the drying of solvent-based paints is dominated by temperature and interfered by humidity; the drying of water-based paints is dominated by humidity and interfered by temperature. The selection and matching of film-forming additives are crucial to the performance of the coating Importantly, if a formula performs well, it is because of the film-forming additive; vice versa. However, the process of volatilization of film-forming additives from the system is extremely complicated, especially for mixed solvents, and an accurate description cannot be given so far.

 Some data on film-forming additives (for reference)

Film-forming additivesBoiling point/℃Surface tension (25℃)/(mN/m)Evaporation (BuAC=100)90% evaporation time/sWater solubility/%水在 Among them, solubility/%
Ethylene glycol monobutyl ether 170.227.47.97000
2 Ethylene glycol monomethyl ether194.124.6 1.929400
Diethylene glycol monoethyl ether 20131.71
Diethylene glycol monobutyl ether230.4300.4190000
Propylene glycol monomethyl ether12027.762
Propylene glycol monopropyl ether149Propylene glycol methyl ether acetate14626.933
163
Dipropylene glycol methyl ether acetate20927.31.5
163.5


Good film-forming aids: can reduce the usage of film-forming aids and make the formula more flexible;

Quick drying: This is self-evident for the importance of filler orientation and early performance;

Appropriate volatilization gradient: Appropriate amount of slow evaporation film-forming additives can improve film density and prevent edge shrinkage. Very helpful;

Currently mainstream Film-forming additives include propylene glycol methyl ether (PM), ethylene glycol butyl ether (BCS), diethylene glycol ethyl ether (DEE) and diethylene glycol butyl ether (DEB).


�In order to reduce the usage of film-forming additives, the formula is more flexible;

Quick drying: This is self-evident in the importance of filler orientation and early performance;

Appropriate volatilization gradient: An appropriate amount of slow evaporation film-forming additives is of great help to the density of the film and the prevention of edge shrinkage;

The current mainstream choices of film-forming aids include Propylene glycol methyl ether (PM), ethylene glycol butyl ether (BCS), diethylene glycol ethyl ether (DEE) and diethylene glycol butyl ether (DEB).


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