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Service > Paint people must knows

Paint people must knows

1. Why in the paint process, make the best use of a primer layer filled?
A: Because the primer, designed to fill the main purpose formula design, it has excellent filling and sanding properties and low cost, but if you do the bottom filled with paint, filling effect is poor, and the high cost .

2, at the end of the coloring process, why not use transparent wood putty filled eyes?
A: The first colored transparent putty, make the plate with no color. If after using the transparent colored putty, putty due to uneven thickness, will affect the uniformity of coloring

3, bottom Depot closed primer and what is the difference between closed?
A: The bottom Depot permeability than good primer, after the film, formed between the bottom and the wood fiber treasure was closed, the film is more dense than the primer. Closed better.

4, why, before applying paint, primer thoroughly polished smooth?
A: 1, to enhance its adhesion;
2, there is a strong finish with collapsible, such as uneven paint, the paint after coating, the coating effect is poor flatness.

5. What is the standard primer thorough sanding?
A: 1,450 angular look dull highlights;
2, was ground glass.

6. What is the standard primer brush passes?
A: The wood should be thoroughly filled eyes. I.e. by polishing effect of film formation can be obtained.

7. Why emphasize the main paint PU paint, curing agents, diluents supporting the use?
A: Different PU paint, with different dilution system, the solids content is also different. Such as the use of non-matching thinner or curing agent, it will affect the cross-linking reaction of paint, resulting hardness is not enough, quit, film cracking and other problems.

8, PU paint in the deployment, why emphasize the required percentage of the ratio?
A: PU paint and hardener ratio is calculated by the formula of a chemical reaction. Ratio should be strictly controlled. If you want to add a curing agent, the film brittle burst. Easy to produce bubbles when the construction, high matt sheen. If you add enough little hardener film hardness, scratch resistance is poor, slow dry even quit.

9. Why not use real paint palette color fine?
A: Because the real component of the paint in the color of the main pigment. The dye color is composed of fine, no hiding. If used in a solid color paint color fine in color, tone is not obvious, and prone to floating color masterbatch applications in real paint palette in.

10, when the paint construction, why stir?
A: Paint is a mixture of resin, pigment, solvent and the like. It is not a solution. During the paint, matt paint matte powder dispersed in the liquid inside the paint. Therefore, usually during storage will have a certain degree of subsidence, forming paint layered usually talk. Therefore, the need for full deployment of the paint before stirring. (Must stir the paint are: matt lacquer, transparent colored surface, solid colors, Anita paint, wood treasure

11, how to treat anti-yellowing paint?
A: The paint is paint yellowing characteristics, rather than pathological. Thus, paint yellowing is relative not absolute. PU paint, the general anti-yellowing and anti-yellowing varnish is usually light-colored sheet selection yellowing resistance, dark sheet selection generally anti-yellowing varnish

12, how it affects the moisture content of the wood finishing quality?
A: undried timber contains a large amount of water, at low temperature, high humidity, absorb moisture in the air timber is expanded, and high temperatures, while low humidity, wood moisture evaporation outwardly gradually shrinks, but the timber in all directions The contraction and expansion are different. The minimum vertical and radial larger maximum tangential. When the state changes the ambient air, the moisture content of the wood is to follow changes, causing the wood to expand or contract. The moisture content of the wood should be controlled in general 8-12% is appropriate. If the moisture content exceeds the moisture controlled, wooden furniture becomes wet, dry slowly when finishing coating will reduce adhesion of the film, will whiten volatile type such as lacquer. Make curing drying paint, such as PU paint bubbles, pinholes and other defects in the film. When the climate is dry, the moisture content of wood shrinkage evaporation, easy to crack, so that the film surface damage, so be sure to make furniture of wood after drying, moisture content should be controlled within a predetermined range. In addition, the timber before doing Baipi primer must be effectively closed, as spread out at the end with CR PS900 Depot prevents moisture in wood and other materials, and prevent deformation of wood, paint blistering, pinhole and so on. After drying also helps to remove sanding wood wool and so on.

13, spraying lacquer (NC) film why white, how to prevent whitening?
A: The paint film after film presents the phenomenon known as cloudy or milky white paint white, also known as white, white, albino, etc. When the original white paint spraying lacquer trapped analyzed as follows:
1, lacquer itself has a very good solvent release, solvent evaporation to the atmosphere, would have been easier than in other lacquer paint in NC;
2, NC paint formulations containing volatile and more rapid solvent;
3, in case of high-temperature environments, faster solvent evaporation;
4, rapid evaporation of the solvent, absorbs the energy of NC-sprayed wet film membrane, the wet film surface temperature drops momentarily 2-30C, provides a "condensation" happened "cooling beds";
5, hot and humid environment, the surrounding wet film of high water vapor content quickly in the "cold bed" on condensed into micro droplets;
6, micro-droplets with wet film bad miscible, turbidity or white phenomenon, known as "white."
The above is a prerequisite whitish 1,2,3, 4 is an intermediate process, 6 is the final result. After whitening phenomenon, some proper heating (eg with lights shine) can whiten disappeared recovery ever. What others are not reversible, always white, the reason is unknown. Although the estimate, but does not repeat

14, to prevent the film "white" may take the following measures:
1, the temperature of the coating to 15-250C appropriate environment, the relative humidity should be less than 75%;
2, spraying should always check the oil and water separator effect, to promptly remove air moisture;
3, to pay attention to try to take high-quality paint and water that day;
4, when the high temperature, high humidity environment, construction whitened phenomenon, can be added to Whitewater (such as China Resources furniture paint Nz308 Whitewater), is actually a slow-drying solvent is added, so that the surface of the wet film to reduce solvent evaporation rate , not "cold bed" formation. When added to Whitewater, Whitewater added first day that water, stir, and then added to paint normal water that day, the general amount of: the day that water: Whitewater = 9: 1 (by weight). The maximum amount may be increased to 20% of the water that day. So while the film is still white, should stop painting, and other environmental temperature, humidity decreases after the construction. Because of Whitewater adding too much paint will dry too slow, soft, sticky, affect the film quality.
5, using the correct way to keep the indoor environment in line with the requirements of the painting. Outdoor apricot rainy days, but the doors and windows wide open "air" is wrong. Outdoor rain turn eyes, humidity drops, but the interior was still damp, quit a few days, which is the water vapor easily into hard results, then open doors and windows, and even forced ventilation is right

15, what is called "wet-on-wet" painting, in which the spray process, which species can be "wet-on-wet" painting, how to operate?

A: The "wet on wet" technology from industrial paint coating. The two original two baking spray a mill (spray - baked - Grinding - Spray - roast) to two thousand spray. When "touch" up the best? The key is to make the first solvent in the wet film under the environmental conditions, in the appropriate inter-layer interval of time to maximize the volatilization out to "touch" the second track up the film during the curing process no pinholes, bubbles sagging prevail. Appropriate interval between layers, depending on the weather, the substrate, paint types, wet film thickness varies, usually within dry after a suitable period of time.
To "touch" Well, in principle, should be "should be slightly lower thin, upper thicker." Most likely to "touch" bad operation is "lower thick interlayer spacing enough time." It is to be emphasized, because "change must be restrained, haste makes waste." The case of "wet-dry", "dry" generally should light grinding to ensure adhesion, another test should be done to prevent the "wet" to "dry" bite together.

"Wet on wet" process is usually applied PU polyester primer, NC nitro spray paint. PU, NC paint a thick spray often prone to pinholes, bubbles, sagging and other phenomena. To avoid this phenomenon can be sprayed first (usually refers to a painting of two cross), when the first film to reach dry, for crosslinking type PU primer class has an initial cross-linking reaction. For volatile type NC class primer, when the first film is dry, paint the most of the solvent has evaporated off. The first film began preliminary curing time and then spray paint the second track, due to the first film is not completely cured. PU film category for joint participation Erdao crosslinking reaction Erdao film category for NC mutual penetration. Whether or NC PU class category two will blend film without sanding between layers, adhesion is also very good, it seems like a spray paint.

For PE paint, its own characteristics is a thick spray no pinholes, bubbles, therefore, PE paint is generally not used "wet on wet" spray process, usually PE primer is a continuous spraying done.
Through the above analysis, the "wet on wet" spray process, according to the actual situation, application flexibility, in order to obtain good results in terms of quality and economy.

16, the same barrel matte clear coat, just started, shiny bright, and more later, its gloss getting lower and lower until finally, into a full-Asia, which is what causes?

A: To solve this problem, we must first clarify the characteristics of matte clear coat composition, usually matte clear coat composition in addition to the basic components of resins, solvents, additives, etc., there are decisions matte clear coat gloss matting. Matting is not dissolved in the paint. But as a suspension of fine particles dispersed in the paint. The proportion of fully wet after matting than other components to be bigger, therefore, matt clear coat after a storage period of time after which the matting will slowly precipitate a lot of matting will accumulate in whole bucket of paint lower and closer to the end of the barrel, the more the amount of matting accumulation. When using paint, if not for the whole bucket of paint stirring or agitation, but not sufficient, it will cause cause a bucket of paint, paint matting varies in different parts of the content or the content of the different paint matting poured times mixed. So there will be a whole bucket of paint at the beginning of use, brighter luster, but more to the underlying paint, gloss increasingly low phenomenon. Therefore, before each take paint bucket self, be sure to paint the whole barrel with a stirring rod, stir from the bottom to the surface, stirring attention, not just to stir the circumferential direction, in the direction to stir around the same time, stirring To extract the rod up and down, a stirring rod to be inserted into the bottom of the barrel after the put up, so that the bottom of the barrel portion of sediment surface layer of paint mixed thoroughly. At this time, and then remove the paint used, the required ratio with paint were used. The only way to make use of paint every performance (including gloss, hardness, fullness, hiding) consistent.

In this stressed: matte paint precipitation is absolute, not relative sink. Good matte paint allow precipitation, but has been able to fully Stir better. If you do not place a long time, matting would sink to the bottom of a large number of dead knot, a lumpy, severe stratification, it is difficult even after stirring, the effect is difficult to finish the qualified person, not the top grade.

17. Why does the spray run oil phenomenon?

A: The paint on the surface to be coated shrink, forming like beads, pinholes and other shapes and sizes, such as water spilled on the wax paper, like speckled exposed bottom, a phenomenon known as "running the oil." Also known as "laugh." The higher the probability of the occurrence of PE run oil paint. Cause "run oil" is due to the reason for the paint surface to be coated or poor wetting surface tension caused by excessive.
Run oil causes are as follows:
1, the bottom or paint mixed with oil, wax, moisture, affecting the film adhesion, the surface tension of the film to make the film contraction run oil.
2, within the primer has quit diluent, such as kerosene, diesel fuel, not timely volatile drying topcoat on.
3, the underlying paint too smooth, and produce oil and adhesion ran less than the surface tension of the surface layer of the surface layer of the coating.
4, the coating or incorporated poor wettability excessive silicone oil, are not easy to form a uniform film layer, prone to run oil.
5, spray room air contamination, such as polished, acid vapor volatile plant processes (such as footwear, pickling, plating) around the spray booth, the wind direction will change the oil, acid vapor blowing spray booth, so paint run oil film.

Run oil processing methods:
A handle grassroots coating applied without oil, wax, moisture and so on. To check the effect of the separation of oil and water separator, check the gas line if there is oil and water vapor exists, if it should handle clean before spraying.
2, coating application viscosity should be moderate and slow selection volatile solvent, such as change for the summer and winter with thinner thinner.
3, try to avoid the cold, damp, smoky environment under construction, do not spray build polished, acid vapor evaporation plant nearby.
4. The incorporation of silicone oil paint should be appropriate, will produce excessive incorporation run oil.
5, the construction of oil found running, should immediately stop the construction, check the reason to run the oil, remove and then construction.
6, has been the emergence of the workpiece run oil should be polished smooth after all the hard work, and then re-applied

18, the importance of process in the polished furniture painting what? Sandpaper grinding process of how to choose?
A: As the saying goes: "10 minutes painting, three in the sand," shows the importance of sanding paint job.
Grinding process has three main functions: ① burr for the substrate is clear, oil and dust on the substrate surface; ② to scratch the surface of putty, general surface is rough, you need to obtain a more flat surface by sanding, polishing and therefore can reduce the surface roughness of the role; ③ enhance coating adhesion. It normally takes hard work on the old paint layers after sanding before painting the new film, due to excessive smooth surface coating adhesion is poor, polished to enhance the adhesion of the coating machinery.

Polishing methods are dry grinding, wet grinding and mechanical polishing of three.
① Dry sanding: using sandpaper to polish. Applies to hard and brittle paint kind of grinding, the drawback is in the process of operation generates a lot of dust, impact on the environment and health.
② wet sanding: sandpaper dipped in water or soapy water and polish. Mill can reduce wear scar, improving smoothness of the coating, and the province of sandpaper, and effort. But the mill should be noted that when the lower spray paint to coat the lower one is to wait for the paint layer is completely dry after water mill, otherwise the paint is easily washed out. Another highly absorbent substrates should not Watermill.
③ mechanical polishing: a large area of construction, in order to improve efficiency, can be mechanical polishing methods, such as an electric sander (disc, vibration).
There is also a polished: painting requires an indication of "light wear", for example, on the sealer, old paint and then cover, after partial repair, etc., you should choose a finer sandpaper and Confirmed were effectively "light wear." Otherwise, just the opposite.

Polish should be strictly in accordance with the requirements of the selection process Abrasive materials, according to the following general rules of conduct selection sandpaper:
Polished wood selection Baipi 180 # - 240 # sandpaper
Plywood or a sanding primer selection 220 # - 240 # sandpaper
Smooth sanding primer selection 320 # - 400 # sandpaper
Finally, a selection of sanding primer or topcoat 600 # - 800 # sandpaper
Selection polished finish 1500 # - 2000 # sandpaper
Hand-polished using sandpaper sandpaper when the whole generally a cut of four, each folded and clamped at both ends with the thumb and little finger, the other, three fingers smoothing pressed on sandpaper, sanding back and forth on the object surface.
According sanding objects change at any time, use your finger in the hole and fingers stretching, in uneven areas and edges and corners, maneuver polished.
When a large area of sand, need to grasp the "high prevail" principle, the application of sandpaper palm rotation can also be attached to the lining slightly harder rubber such as sponges, soft wood, with the thumb and index finger pinch tightly around the end face, flat sand mill.
Sanding work fingernail length should be appropriate to avoid injuring the finger operation.
To ensure the quality sanding, grinding work must be guaranteed for the training, assessment and management. For grinding work teams to maintain maximum stability is very important, that "the easiest polish job, do not teach, do not control." Or "anyone can go to polish," the view is absolutely wrong.
Putty good workers, good spray work, you must first be a good sanding work, so as to ensure that the inspection process between each other and the final quality

19. Why will produce bubbles, pinholes when spraying?

A: spray bubbles, pinholes analyzed as follows:

A phenomenon: first there were many significant bit of the bubbles in the coating surface, and then the bubble burst or frayed holes when the film grinding dense as that of pinhole formation.

2 reasons: gas (solvent vapor, water vapor, air or other gas expansion energy entering into the paint, such as carbon dioxide among the) coating the undercoat layer muster break bubble formation, and thus cracks or pinholes formed frayed. When the coating of the surface speed is slightly higher than the internal dry, but when the surface has begun to condense inside the air continues to evaporate the solvent, or that will break through the coating surface to form bubbles. This and the following circumstances: paint viscosity is too high, a thick coating, wood catheter deep rough, fill holes contain false air; spray air pressure is too high, too much paint mixed with air; attached to the surface to be painted oil, dust, sweat, etc. These dirt build-up around the water; the temperature difference between the paint and the surface to be coated is too large; improper use thinner, hardener added excessive or wrong hardener; painting the ambient temperature is too high or too high relative humidity; dried at Tu That does not exactly lend on coating, painted rapid drying; when using heating and drying the coating, the temperature is too high, standing before the coating is heated enough time, not sufficiently volatile solvents, paints itself into the air bubbles generated when the agitation not eliminated more.

3. Remedy: For the above reasons the coating process conditions to check and adjust the viscosity suitable for coating, equipped with an appropriate amount of a suitable diluent, curing agent, coating thickness control; prepare the substrate to fill holes, sanding, eliminating the substrate adjust the proper air pressure to reduce air mixing;; improve the working environment, appropriate control temperature and humidity; elongated recoating appropriate time, so that the lower dry fully; paint mixing well after going to stand for 20 minutes after spraying; using heat drying pollution When the coating, the standing time control sufficiently volatile solvent and then pre-heated coating.

20, components suitable for crack paint requirements and environmental conditions have?
A: 1, flat, curved and other shaped pieces of complex shape can spray paint cracks.
2, Baipi moisture content must comply with local equilibrium moisture content.
3, flat or curved-time continuous spraying area can not exceed 2 meters, or should block the construction.
4, the construction site should be well ventilated, well-lit, easy to observe the effect.
5, the construction site should facilitate the construction workers to walk freely, can not have too many obstacles, high-altitude construction should be setting up scaffolding to facilitate the construction workers to move freely

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