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(1) the choice of resin emulsion
The main properties of the resin emulsion
The most important is the performance of water resistance, weatherability resin emulsion. The general exterior wall coating such as propionic acid ester emulsion and styrene acrylic emulsion, water resistance, weather resistance can meet the. Requirements of the higher wall decoration, can use waterproof resin emulsion introducing hydrophobic groups (such as silicone acrylate emulsion, emulsion of fluorocarbon resin emulsion waterproof properties of the resin), to make a certain improvement.
The glass transition temperature of the resin emulsion
Summer, outer wall in the sun, temperature is over 50 DEG C, surface temperature higher dark coating. So the requirements for glass resin emulsion paint for exterior wall temperature is higher, the best in the above 30 degrees. General amorphous polymers in different temperature regions, there are three kinds of mechanical state, namely the glass state, high elastic state and viscous flow. The polymer is in the glass state temperature region, the best mechanical properties, film is hard, not easy to pollution; in the high elastic state region, the film becomes soft, elastic, mechanical properties decrease. So the choice of resin emulsion glass with higher temperature, is conducive to improve the C film mechanical properties and good anti contamination performance. While the glass transition temperature is too high, is not conducive to the paint film, adding excessive film-forming agent can solve the problem of a film, but is not conducive to the stability of coating for storage. A core shell emulsion has higher glass transition temperature, but also can film at low temperature, can solve this problem effectively.
(2) the choice of packing
Surface coating for exterior wall roughness requirements are generally lower than the inner wall, therefore, the coating with the coating unit is generally higher than that of the inner wall, to save costs, can fight with some good weather resistance fillers.
Mica powder, flake structure, overlap each other in the coating, is conducive to enhance the overall strength of the film. Ultraviolet shielding, improve the weathering properties of the film.
Barite powder: structural stability, anti ultraviolet ray penetration ability is strong, not easy to fly, is helpful to improve the weather resistance coating. Wollastonite acicular structure: overlapping in the coating, which can improve the strength of the coating.
(3) the choice of pigment
White paint, exterior wall paint general should choose rutile titanium dioxide (type R), do not use the anatase titanium powder (type A) and lithopone powder, in order to avoid the powder color ills. Other colored paint, recommend the use of pigment printing paste. The direct use of toner, likely due to dispersion problems caused the phenomenon of uneven color. Coating color retention is an important quality index of coating of success, paint manufacturers must not be taken lightly, can consult the suppliers to ultraviolet resistance coating paste.
(4) the selection of AIDS
Assistant gives the properties of the coating, part of which meet the use performance of coatings, such as rheology, appearance, coating performance; one part is the intrinsic properties of the coating, such as dispersion, defoaming, anti-corrosion, preparation and storage stability. Another is the coating film formed on the process and the performance of the film, such as film, hydrophobic, extinction and aging etc.. Exterior wall coating in the selection of AIDS on the use and the inner wall latex paint should be different and focused comparison. The majority of soluble and not volatile additives residues in the coating, cause bad effect on coating quality. Therefore, should be based on the actual situation of paint raw materials, to the assistant should have "control" or "quantity". Not like the interior wall paint coating that focuses on the pursuit of "surface" quality.
Coating additives supplier for many, paint manufacturer shall provide technical parameters according to the additives supplier and used emulsion, pigments and fillers to carefully adjust the formula.
