Can sodium bentonite be used in water-based latex paint?
Roll coating advantages:1 、 high-speed automation operation, coating speed, high production efficiency, production speed is generally about 100mm/min, the highest up to 244m/min;2, do not produce paint fog, no paint fog splash, coated with efficiency close to 100%;3, low viscosity and high viscosity coating are suitable, can be 3-5 m film to 300-500 m thickness, all kinds of film thickness coating. The film thickness can be controlled more accurately, and the thickness is uniform;4, the front and back can be painted simultaneously.
There are three main ways to paint latex paint: roller coating, brush coating and spray coating.
Roll coating defect:1, only to adapt to the surface coating, do not adapt to other shapes of the coating;2, because roller coater adopts a uniform coating, cycle transportation, recycling system, coating input is large, so it is not suitable for small batch production of many varieties;3, coating process conditions, such as improper control, film prone to roll marks;4. Because the coating is transferred to the surface of the coating in the form of wet film on the roller surface, the solvent is volatile fast, and the viscosity of the coating is easy to change during the roll coating process.
Brushing is: manual operation, low production efficiency, labor intensity. For dry, faster and less smooth coatings, brushing is easy to leave brush marks and uneven film thickness, affecting the smoothness and decorative effect of the coating.Brushing defects:1, paint liquid impurities, paint liquid too thick, latex paint quality is poor, easy coating is not smooth.2, coating viscosity is too low, coating too thick, easy to drop.3, improper treatment at the grassroots level, coating too thick, especially when the core board is easy to bubble when making the base.4, latex paint construction temperature is low, failed to form a continuous coating, while cracking, water will fall off; loose roots, oil and other dirt, coating and substrate adhesion is not good, resulting in peeling.5, some wall temperature is too high, the sunshine time is long, or water soluble salt crystallization on the wall, and cause the latex paint discoloring and fading; some wall containing alkali value is too high, against the weak anti alkaline pigment or resin caused by discoloring and fading.6, the construction temperature is too low, not up to the paint film forming temperature and can not form a continuous film base; improper handling, coating cracking wall cracking caused by the brush; the first coating is too thick and not completely dry with second, due to internal and external drying speed is different, cause the coating cracking; cracking of cement group the putty scraping, cause the coating cracking.7, the grass is not dry on the wet construction, not brush sealing solid primer and paint too thin, it is easy to anti alkali powder.8, brush coating is too thin, the number is not enough or poor quality materials to the end.Spraying mainly is highly dispersed paint fog and volatile solvents, not only pollute the environment, not conducive to human health, but also waste paint, resulting in economic losses.
