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Water-based coatings are more used in household coatings, automotive coatings, metal coatings. As the concept of environmental protection spreads further, water-based coatings will play a role in more areas. The main varieties of water-based coatings market are latex paint
china
. Latex paint is mainly composed of water, lotion, pigment and a variety of additives four major parts, water-based paint dispersion medium is water, paint construction, volatile from the coating film is water and a small number of additives, with environmental protection, safety and other properties; The dispersive medium of solvent-based coating is organic solvent (VOC), and the organic solvents evaporated from the coating film are mostly toxic and harmful substances, which are potentially harmful to the human body and the environment.
: Water-based coating formula, the substation is the formation of paint film and determine the paint film performance of the key ingredients. Formula design should try to improve the amount of water-based resin, accounting for 60-70% of the volume ratio, so that the effective film content in the lacquer liquid as much as possible, so as to ensure that the paint made of a coated paint film thicker, high plumpness. Commonly used resins include water-based acrylic resins, polyurethane dispersions, etc.
film additives: film-forming additives have good solubility, low volatility, easy to be absorbed by latex particles, can form an excellent continuous coating film. Film-forming substances used for excellent performance in latex coatings can greatly improve the film-forming properties of latex coatings. In addition to significantly reducing the minimum film temperature of latex coatings, latex coatings can also improve the cohesion, scrubbing and color display, so that the paint film at the same time has good storage stability.anti-foaming agents and anti-foaming agents are one of the most difficult to control the balance between deblistering and leveling in water-based coatings. The paint liquid creates bubbles in the coating due to stirring. If the bubbles present in the lacquer liquid are not eliminated in time, the paint film is dry, forming unacceptable defects. Paint solution also creates bubbles during production, pumping and filling. Defrosting is a factor that cannot be ignored in the formulation design process, the defrosting process of defrosting agent is through wetting and penetrating the foam film produced by the system and constantly spreading on the film, so that the surface tensor of the foam film is unbalanced and burst.
wetting leveling agent: wetting leveling agent can effectively reduce the surface pressure of the system, significantly improve the construction effect of water-like wood paint. After adding wetting leveling agent, the wetting performance and permeability of the paint on the substrate are increased, and the leveling of the lacquer liquid is obtained by wetting the leveling agent: the wetting leveling agent can effectively reduce the surface pressure of the system and significantly improve the construction effect of water-based wood paint.
the wetting performance and permeability of the substrate by adding a wetting leveling agent, the leveling of the lacquer liquid is improved, and sometimes the shrink edge (frame effect) problem can be overcome. Excessive leveling agent will counteract the deblistering effect of de-foaming agent, so that the lacquer liquid in the construction of bubbles, and some also have a clear stabilizing effect, so should try to choose a good leveling, low foaming, low stability of the wetting leveling agent. Flow aid: the flow aid provides a low shear condition of the leveling effect, so that the paint liquid after painting can be leveled as soon as possible, reduce brush marks, avoid splashing, but this leveling effect will gradually weaken with the progress of drying time.