Filming aids in waterborne coatings

Problem :

Why do you need to add filming aids to one-component waterborne coatings? The emulsion alone does not form a film. Filming aids are added to form a film.

Why does the film-forming auxiliary volatilize, which is still a complete film, and is different from a film without a filming aid? Why can't a single emulsion be fused

by water to produce a capillary pressure fusion film?

Response:

Film forming auxiliaries are not required for all emulsion film formation. These additives are only required for those resins that require higher hardness after film

formation.ecause the emulsion particles of these resins are relatively hard and their self-flowability is not good, even if the capillary pressure (surface tension) you

mentioned is not enough to fuse the particles, the polymer chains penetrate each other and form a molecular level.Continuous film.Water in these systems is only

a dispersing medium and does not have the plasticizing effect of softening resin particles.

In Sinograce chemcal's resin system, fast drying nano-scale waterborne acrylic resins, high adhesion aqueous acrylic emulsions and high solid aqueous aliphatic

polyurethane dispersions do not require a filming aid. High-hardness water-based acrylic emulsions, self-crosslinking acrylic emulsions, etc., require the use of a film-forming aid in the formulation to aid film formation.

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