Water-based wood paint construction tools and painting precautions

ShyanGe Paint developed the water-based paint sample color palette, which has good adhesion, high hardness, good clarity, good hand feeling, good yellowing resistance and good water resistance. , The coating film has good durability and environmental protection.

  1. Construction tools:

    General water-based wood paint can be applied by brushing or spraying. Among them, brushing is the most common method for home furnishing, and spraying is the main method for furniture painting. The construction effect is better.

    1. Brushing toolA, fiber brush, 1 inch to 4 inches can be usedB, Gauze (paper), ranging from 240#, 320#, 400#, 600#

      C, rag

      D, 200 mesh filter

      The water-based wood paint is different from the oil-based paint. Instead, it should be brushed thinly and lightly from top to bottom or bottom to top, and not too thick at a time. If you apply a thick brush like oil paint, it is easy to produce brush marks; brushing back and forth multiple times will easily bring in air bubbles and affect the effect of the layout.

    2. Spray tools
      Spraying machine, spray gun, caliber 1.0~1.5mm, pressure 3~4.5kg/cm², oil volume and air volume should be adjusted appropriately. Sandpaper, filter, rag, etc. are the same as those used for brushing.
  2. Construction suggestions and precautions:
    1. The painting site must be cleaned up, and there must be no dust, flying dust, or messy items. The surface of the painting substrate should be dry, free of dust, oil and other chemical substances. If there is old paint film on the surface of the substrate, it must be removed before painting, otherwise it will affect the painting effect. The painting should be carried out in fine weather.
    2. Span style=”font-weight: 400;”>Stir well before construction, and dilute with water to Appropriate construction viscosity. Note that there should be no scale and other impurities in the tap water.

    3. The suitable construction temperature for water-based wood paint is 5~35°C, and the relative humidity is 50%~80%. If the temperature is lower than 5°C and the humidity is higher than 80%, heating can be installed on the construction site. Install or use dehumidifying equipment to increase and decrease the temperature, and the construction can be carried out only when the required conditions are met. When the air in North Vietnam is dry, the spraying or brushing can be slightly thicker and the interval time can be shorter; when the humidity in South Vietnam is high, the spraying or brushing can be thinner and the interval time can be longer.
    4. The assembly line coating operation requires drying room equipment and, if necessary, a dehumidifier.
    5. Although the water-based wood paint dries quickly, the water in the paint film is completely It takes a long time to volatilize, and the physical properties can only be tested after 7 days of drying (the winter time should be appropriately extended). Woodware that has been painted before this should be treated with care, and should not be laminated, covered, or collided to avoid damage.

    6. Water-based paint uses water as a solvent, mainly through the volatilization of water to form a film. In humid areas, the construction site must be well ventilated to accelerate the volatilization of water and shorten the paint filming time. If you want to achieve the ideal paint mold effect, it is recommended to coat multiple times, and the time interval of recoating must be strictly in accordance with the construction instructions.
    7. The water-based wood paint is at a temperature of 25°C and a humidity of 50%. The interval between repainting is generally 1~2 hours. During the construction, the paint film should be dry, that is, there is no finger mark on the surface of the paint film.
    8. Water-based wood paint is a water-based product. It is strictly forbidden to mix oily substances with other paints .
    9. Tools should be cleaned in time after the construction is completed. Waste water should not be poured into the sewage pipe. So as not to block.
    10. Unused paint should be sealed and stored, and the construction environment should be kept clean.
    11. The shelf life of water-based wood paint is generally one year, cool and dry above 0°C Keep it somewhere to avoid freezing.
    12. Humidity in different regions has different effects and requirements on materials and paint In this case, it is best to try samples first to confirm suitability.
  3. The application of water-based wood paint in high temperature and high humidity climate

    The construction of water-based wood paint in high temperature or high humidity climate often produces some abnormal problems: such as paint film wrinkling, poor paint film adhesion, paint film cracking, paint layer whitening, etc., which will affect the construction progress and decorative effect. Therefore, the construction personnel must have a clear understanding of the production procedures and construction requirements of the product before construction, and have skilled construction skills to ensure the best decoration effect under high temperature weather. The following is a simple analysis of the abnormal conditions caused by such high temperature or high humidity weather:

    1. Paint film wrinkles

      Some construction workers adopted a one-time thick coating method when using water-based wood paint for flat coating. The result was excellent fullness, but wrinkles appeared on the surface of the paint film. The reason for the problem is that the surface layer of the thick-coated water-based wood paint film dries quickly to form a film at high temperatures, while the thick inner layer dries slowly. The flow of the paint during the drying process produces a difference in tension, resulting in the final film surface Uneven, that is, we can often say wrinkles. Therefore, do not apply a thick coating at one time during construction, but still use a thin coating to ensure that the coating is evenly dried and formed into a film to achieve a smooth paint film.
    2. Poor paint film adhesion

      In the environment of high temperature and high humidity, the general water-based wood paint will find that the coating is not firmly bonded after construction, resulting in poor adhesion, and peeling between layers, and even the whole piece can be torn off like peeling , The direct cause of poor adhesion between paint film layers is that the painter did not polish the layers during construction. Because the painter is in a hurry, in the next process, it is directly painted on the previous paint film without sanding. In addition to the high temperature, the time required for the formation of a firm layer at the interface between the wet paint film and the dry paint film is not enough, which makes adhesion The force is affected. Therefore, construction personnel are required to fully polish each layer during construction in high temperature weather to improve adhesion. At the same time, the construction schedule is appropriate in the morning and evening to ensure that the product quality is reflected.
    3. Cracked paint film
      This phenomenon is also common in high-temperature construction. During the construction process, the paint layer is smeared too thick, which causes the surface layer to dry and form a film quickly, and the thick inner layer The layer dries slowly, directly causing the paint film to crack. At the same time, we must also pay attention to the quality of the board. It is recommended to buy a board with good stability.
    4. White paint layer

      It is mainly caused by the high humidity in the construction environment and the thick paint film during the construction process. Because of the high temperature and high air humidity in some areas, the surface drying time of the paint layer increases with the increase in temperature, but the actual drying time is relatively slow. Painters often ignore the actual drying time during the construction process. After the surface of the layer is dry, the next application is carried out immediately, resulting in the bottom paint layer not being completely dry. In the weather with heavy rain or high humidity, the whitening of the paint layer is most likely to occur.
  4. During the construction process coating film defects and countermeasures
    Phenomena Reason Countermeasures
    Shrinkage
    1. The wood surface of the wood is too deep to polish it.
    2. There is oil on the wood panel before painting.
    3. The paint is not allowed to stand for enough time after mixing.
    1. The surface of the wood should be fully filled and polished to meet the requirements.
    2. Remove oil stains while painting.
    3. Stir well and make sure the bubbles disappear.
    Re-sticking
    1. The climate changes abruptly during construction, and the construction humidity is high during the rainy season.
    2. The coating is too thick, the recoating interval is not enough, and the paint film is not fully dried.
    1. In bad weather construction, after the paint film surface is dry, ensure good ventilation. Let the paint film dry out.
    2. After the lower paint film is dry, apply a coat of paint.
    bubbles
    1. The wood surface has deep wood eyes, and the air from the wood billet expands outward after the paint is filmed , Causing bubbles.
    2. The viscosity of the paint film is too high, the paint is too thick, and the paint brush is too fast .
    3. The working environment is dusty.
    1. Scrape the soil to fully fill the wood eyes.
    2. According to the regulations, add a proper amount of water, and the paint brush will slow down. Don’t overdo it once. thick.
    3. Clean up the working environment first, and clean it with construction tools.
    brush marks
    1. The bristles are too hard or the brush has been used for too long, leaving paint residue.
    2. Viscosity of paint is too high
    1. Wash the brush clean or replace with a new brush.
    2. Add a small amount of water to dilute until the brush marks disappear.
    stripping
    1. The substrate is not polished well.
    2. The bottom layer is dirty and oily.
    1. The substrate should be polished evenly
    2. Wipe with clean gauze before painting.
    From grains
    1. The environment is unclean.
    2. There are impurities in the paint.
    1. Pay attention to environmental hygiene.
    2. When painting, use a filter with 200 mesh or more.
    Lost light
    1. The air humidity is high.
    2. When the paint film is not dry, it encounters water; add too much water when mixing the paint.
    1. The air humidity is too high, so it is best not to construct.
    2. The construction should be based on product requirements.
    Sagging
    1. Too much paint is too thick.
    2. Too much water has been added to the paint.
    3. High humidity, low temperature, and slow drying.
    1. Do not dip the brush too much, and the paint layer should be thin and even.
    2. Dilute with water proportionally.
    3. Fully consider the humidity and temperature of the construction site.
    White
    1. Construction in rainy weather, the air humidity is high.
    2. The paint film is excessively polished and the bottom is leaking.
    3. Ultra-low temperature construction
    1. It is best not to construct in rainy days.
    2. The water mill must be mastered, not excessive.
    3. Spread above 7°C.
    crack Low temperature construction. Increase the construction temperature.