Talk about the production of PU paint precautions

China Paint Online News Information
First, PU matte series production notes:
1, about the gloss of matte varnish. There are many reasons that affect the gloss of matte varnish, including the spray thickness of the paint, the drying speed of the paint, the degree of mixing uniformity before spraying, the ventilation condition of the production site and the relative humidity of the air in the production site all have an effect on the gloss of the paint.
2, some paints because of the curing agent is different, diluent solubility, volatilization speed is different, coating film thickness is different, will have an impact on the performance of the final paint film, matte degree, so pay attention to the production should pay attention to the use of matching curing agents, thinners and so on.
3, different seasons should choose the volatility rate corresponding to the diluent, diluent volatility speed is too slow easy to cause paint film flowering, sand. Volatile speed is too fast to cause whitening, loss of light, uneven, poor adhesion and other product quality accidents.
4, winter on the paint. The viscosity of the paint is greatly affected by the temperature, and as the viscosity decreases as the temperature increases, the viscosity increases as the temperature decreases. This will lead to greater diluent in winter, lower viscosity, prone to poor plumpness, sand, poor feel, reduced gloss, poor sand cover capacity and other quality problems. Therefore, in winter should pay attention to the storage temperature of paint, paint place temperature should try to maintain the same temperature.
2, PU white paint production precautions
1, in order to make a quiet surface effect is better bright white paint, and hope to remain unchanged for a long time, it is necessary to start from the selection of medium fiber plate, in the application of experimental comparison, the density of better fiberboard, the degree of deformation will obviously be small. Poor density of fiberboard finished bright white surface, put a period of time will obviously deform, especially when using PU white background will become more severe, so it is recommended to choose a good density plate when selecting the medium fiber plate.
2, in the primer, with PE white primer made of bright white paint whether static effect or long-term shape degree will be significantly better than PU primer, especially in the low density of the medium fiber plate more obvious effect.
3, before spraying bright white paint, the lower white background polished well, can directly affect the final effect of bright white surface and the use of paint, if sandpaper is too thick, the surface plumpness and static effect will appear obviously poor if the last use of fine sandpaper over a Once or once water mill, spray white paint can spray less paint, still can get a better static effect and full (individual paint manufacturers white paint on the curing agent supporting requirements are quite strict, misuse or abuse of curing agent not only affects yellow resistance, but also will significantly change other performance).
3, PU bright light series production notes
1, because the light paint is relatively long with matt paint drying time, to ensure that the bright paint surface without impurities, the closed and clean level of the spray room is more stringent. Also pay attention to health, most will be in the cold dry room on the ground sprinkled water or water rinse the room, because its own cool dry room closed better, relatively high temperature, will form a high temperature and humidity environment, so that bright paint is easier to bubble. Therefore, in general, manufacturers will recommend cool dry room temperature control at about 25 degrees, which will improve the pass rate of the product.
2, in the production of paste or sticker furniture, the closed treatment of the substrate and the primer selected on the paper will affect the gloss of the bright paint, due to the poor solvent resistance of ordinary PU primer, the above spray light easily causes poor leveling, uneven surface and gloss and plumpness will be significantly poor, therefore, want to get a better mirror effect, the appropriate amount of primer curing agent will be increased, the opposite surface effect will be improved.
, on the colored transparent paint (also used as a finish paint) production precautions
1, transparent colored paint is transparent and colored. Construction should pay attention to walk the gun to be uniform, do not spray too thick, the final color should be sprayed many times. Otherwise, it is easy to cause color ineptity, affecting the appearance of the product.
2, combined with the bottom coloring process, its paint film effect has a three-dimensional and layered sense.
, about PU paint other
1, curing agent:
general foreign products curing agent is universal, only the primer curing agent and finish curing agent difference. Domestic paint is more complex, so in the production must be the correct choice of curing agent, different varieties of paint in the country due to the differences in the system, the curing agent requirements are different. When using, pay attention to the choice of curing agent, otherwise it is easy to cause hardness, gloss, scratch resistance, feel, sweating uncertainty, in addition to the curing agent filling must be correct, otherwise it will cause gloss and hardness is not normal.
Note: the misunderstanding should be strictly distinguish between curing agent and deto drying agent in the concept of differences, increase or decrease the amount of curing agent is not the correct way to adjust the drying speed of the paint film, reduce the amount of curing agent, will have a bad effect on the paint film.
2, diluent: diluent is also called water.
perfume: high boiling point, slow dry, is diluted Grace solvent, solvent slow dry has the advantage of easy to wipe.
: it is used to improve the whitening of high humidity caused by the rainy season. Slow dry water filling is generally controlled at about 10%, the specific situation depends on the data provided by the manufacturer.
6, special paint production precautions
1, about faux leather paint: the introduction of imitation leather paint is a special effect of paint, belongs to a kind of fine art paint, dry fast, high hardness, good wear resistance, solid dry paint film surface is uniform sand grain-like look, there is a lamb skin feeling. Used in the coating of office furniture and cabinet series.
use: process:
white blank - closed - sand - PU solid primer - sand - PU solid primer - sand - faux leather paint.
:
construction methods and ordinary polyester paint is basically the same, when the construction control of the air pressure, oil production and coating thickness, you can get different imitation effect.
2, about crack paint: can make the paint film present uniform different cracks, good adhesion, according to the thickness of the paint film will show different pattern size. How to use:
spray crack paint generally sprayed 2 "plus" word, the substrate all covered. Crack paint to fit the viscosity, generally spray a "plus" word can achieve the ideal pattern, but the personal technical level of workers to higher requirements spray must be uniform, walking gun to uniform speed. If crack increase is required, 1-2 "plus" words can be appropriately sprayed. Note that it should finally be protected with PU or NC transparent paint.
construction process:
substrate - fill sand - NC solid background or gold base (full cover) - crack paint - NC or PU paint (require PU paint spray thin, avoid completely dissolved crack paint).
production precautions:
A, adjust the appropriate spray viscosity (requires as much as possible to maintain the consistency of viscosity each time sprayed).
B, spraying should be uniform, otherwise the crack size is different (requires each production of the same color the same person spraying, and requires workers to be highly skilled).
C, can not use water ash, plaster putty as crack paint primer.
D, construction need to pay attention to the use of supporting products.
E, due to the crack paint system color is heavier, crack paint construction, to cover the varnish protection. Otherwise, there will be poor adhesion and other coating ills.
G, if sprayed white crack paint should be selected yellow-resistant varnish paint cover light, otherwise it is prone to yellowing. 3, about the pearl paint series: pearl paint has a colorful flash effect, glossy, elegant tone, strong three-dimensional sense.
Use:
pearl paint can be sprayed on different colors of primers, preferably close to its original color, if you want to get different effects can also be sprayed on other kinds of colors, it depends on the actual production situation of the factory. Requires the painting of pearl paint on the primer, 5 dry after light grinding and then with PU bright light clean cover face, will get a high gloss, smooth good mirror effect.
production precautions:
A, spray pearl paint, pay special attention to the pearl powder scheduling and density, the flash effect is ideal.
B, when using the pearl paint to be fully stirred evenly, the number of pearls directly affect the color and flash effect.
C, spray pearl paint generally do not need to filter, when necessary, the use of coarse filtration can be, so as not to filter out the flash powder in pearl paint (general flash powder particles are greater than 200 eyes, less than 100 eyes, too small to affect the flash effect, too much impact on people's visual effects. ), affecting the flash effect.
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