Knowledge of water-based paint

The color paints of waterborne wood coatings are mainly divided into two categories: solid color paints and transparent color paints. The solid color paint is similar to the blend paint of the solvent-based paint. It contains a large number of colored pigments and fillers, has a strong hiding power, and is applied to the wood to cover the grain of the wood, showing the true color of the paint. The transparent color paint changes the color of the wood itself, and does not cover the wood grain, but makes the wood texture more prominent and personalized. Water-based coatings are one of the most sensitive to temperature and temperature among all coatings. Because many properties are completely different from solvent-based coatings, coupled with the hydrophilicity and high water sensitivity of wood determined by the structure of the wood fiber itself, the coating process and experience of solvent-based coatings cannot be applied during construction.

I. Precautions for the construction of water-based wooden paints 1. The ambient temperature of the construction must be kept above 5 ° C, and the relative temperature of the surrounding environment must be kept below 80%; all water-based wood paints and tools, and wood must not be contaminated. It is strictly forbidden to mix with other paints such as grease, oil-based paint or tianna water. In order to maintain the better effect of the paint film, avoid getting wet before the paint film is dry. 2. Use water-based wood paint to paint, try to pay attention to thin coating. Thick coating, brushing must be uniform to prevent falling; 3. Recoating time should not be too long (subject to dryness), if the recoating time is too long, the paint film is dry, and it must be sanded before painting; 4. After the construction is completed or Suspended in the middle, the tools should be washed with water immediately;

5, general base material 2-3 times water-based primer 2-3 times water-based top coat (if you need to completely close the wood grain, for deeper wood grain materials, you may need to apply the primer more than 4 times); 6, if construction Improper, will affect the adhesion, at the same time, water-based paint on oily primer is prone to shrinkage, so it is recommended to use the water-based primer for construction. 2. Preparation before construction 1. Stir well with a clean wooden stick after opening the jar. Do not use shaking method. 2. The open state of the giraffe water-based wood varnish is a milky liquid. After drying, it is a colorless, transparent and bright paint film. 3. Use between 10 ℃ ~ 35 ℃ and relative temperature 30% ~ 70%. 3. Substrate treatment 1. Old paint film (water-based wood paint): If there are damage or groove marks, and the place is not strong, all the paint film must be polished clean. Before applying water-based wood varnish on the complete paint film, you need to sand it evenly with sandpaper. 2. New wood surface: Before the board is not lined and sawn, use giraffe water-based wood varnish primer and add 20% water to paint it again. To prevent staining during the production process, pay attention to applying evenly and not stacking before drying; 3. Make nail holes: use special putty, mix color essence or toner to the same color as wood, repair nail holes, pay attention not to make up Wood grain. Fourth, the construction method 1, the general primer is applied by brush. The topcoat can be applied by brush or air spray; 2. It can be diluted with an appropriate amount of water, usually 10%. It is best to add less water. The amount of water added is based on no obvious brush marks and no sagging. -4 hours, depending on ambient temperature. If the humidity is higher than 90%, the drying time of the paint film may be as long as one day;

4, curing maintenance period of 7 days, the longer the time, the harder the paint film.

V. Grinding method 1. Grinding: During the construction of the primer, use 400 # or more sandpaper between the layers, and fully polish it. Be careful not to wear through the paint layer. 2. Dry grinding or water grinding. After sanding, if the filling effect is still not satisfactory, you can apply a primer again. Before applying the top coat, use sandpaper above 600-800 # and finely polish. 6. Common construction problems and treatment methods of waterborne wood paint 1. Brush marks Analysis of reasons: (1) Waterborne wood paint is not enough to dilute, and the viscosity of the paint is too high. (2) The tools for painting are too hard and the bristles are too short. ) Repeated brushing or re-brushing too many times (4) Re-brushing when the paint film dries quickly (5) Inappropriate construction methods: (1) Add water at a reasonable rate in accordance with the product construction instructions (2) Be sure to Use a fine wool brush for brushing. (3) Do not repeat multiple or light brushes. (4) Do not re-brush when the paint film dries quickly. (5) During construction, you must brush lightly up and down to make the coating even. .