Construction process of brushing woodware paint for wood products

First, wood paint construction materials and tools preparation

Before painting the woodware, you need to make all preparations. The preparation of wood lacquer construction mainly includes three aspects: material preparation, tool preparation and working environment. Let 's take a look at the preparatory work before painting wood ware.

1. Material preparation

The materials used in the construction of linden Wooden Brush manufacturers are mainly wood putty and wood lacquer. The commonly used wood paints are nitro paint, polyurethane paint and water-based wood paint.

The wooden putty can fill and level up the joints, scars, nail holes and other defects on the surface of the wood, which saves material and labor when brushing wood paint, and can improve the smoothness of the paint surface and increase the beauty of the wood surface.

 

[Wood circle]

2, tool preparation

Some tools are needed for the construction of linden lacquer. Common tools are sandpaper, filter, brush, abrasive cloth, spray gun, roller brush, etc.

Sandpaper is used for sanding the wood board surface, the filter is used to filter the impurities in the wood paint, and several tools, such as brushes and spray guns, can choose different painting tools according to different painting methods.

3.Operating environment

The construction of linden wood lacquer is a very precise and meticulous task, which requires suitable environmental conditions. Temperature, humidity, light, ventilation, hygiene, etc. all meet certain requirements in order to make a good paint effect.

Temperature: It is best to be carried out at normal temperature (15-30 ℃). If the temperature is too low, the paint film will become slow; if the temperature is too high (over 35 ℃), the brushing performance will be adversely affected.

Humidity: Avoid humid air, which is bad for most coatings, especially nitro paint and polyurethane paint. Construction in wet and rainy weather will cause whitening or slow drying.

Light: Sufficient light can help to see the varnished surface, identify whether the coating film is uniform, and avoid leaking or sagging in time. Therefore, choose a room with sufficient light for construction.

Ventilation: There should be ventilation equipment at the construction site to maintain proper fresh air circulation. In this way, it is beneficial to the health of the constructor, the film formation of the coating, and the potential fire hazard can be reduced. However, the speed of air circulation must not be too fast, so as not to affect the coating quality.

Hygiene: The construction environment must be kept clean, and the dust and abrasive debris generated during the construction process should be removed immediately, the final effect of the topcoat film will be affected. A clean construction environment is particularly important during floor paint construction.

 

Second, wood paint painting process

The painting of linden wood ware has three effects: closed, semi-closed and open. The closed effect is to completely hide the wood texture, and the open effect is to show the natural texture of the wood. The construction methods of wood lacquer are different according to the effect.

In addition, there are three main types of wood paint: nitro paint, polyurethane paint and water-based wood paint. Due to different product ingredients, the construction methods are also different. There are a variety of construction methods for wood lacquer. It is best to choose the appropriate construction method according to the desired painting effect and selected products. In fact, the difference between the various construction methods is not large, it may be the difference in the order and the number of paintings. Here are some basic methods for the construction of wood paint.

1, sheet processing

Before painting, first clean the wood and wipe off the dust and other surface of the wood. Special cleaning cloths can be used for cleaning, and large areas such as floors can be repeatedly vacuumed with a vacuum cleaner. At the same time, use sandpaper to polish the surface of the board or the line of wood. Pay attention to protect the veneer and do not sand it.

The purpose of the board treatment is to effectively remove the stains, wood wool and wood thorns on the board, so that the surface of the board is clean and smooth, so that the subsequent painting and labor saving effect is good.

2, the board is closed

Evenly apply the prepared special plate sealer to the plate, which can effectively seal the plate and prevent the plate from being polluted.

The sealing of the board can prevent the board from excessively absorbing and dispersing moisture and deforming the board, enhancing the adhesion between the paint film and the board, saving the amount of paint and increasing the hardness of the paint film.

3.Scraping putty

Use the matching wood putty. After the preparation is complete, scrape and apply the putty to the wooden eyes. After the putty dries, use sandpaper to clean it thoroughly.

填充 Filling wood holes with putty can reduce the amount of wood paint and improve the flatness of the paint film. Different paint effects have different requirements for scraping the putty. For example, for an open effect, the color of the putty should be adjusted to match the color of the board before it can be scratched.

 

4. Primer construction

调 Adjust the wood primer in accordance with the required ratio. Brush or spray can be used. The function of the primer construction is to fill the wooden holes and increase the thickness of the paint film.

注意 Pay attention to the dryness of the primer during construction, and must be thoroughly sanded with sandpaper before applying the primer again. Requires uniform brushing, no sagging, and flat wooden eye filling.

5, sanding treatment

打 Sanding the board with sandpaper is actually a step throughout the entire wood lacquer construction process. Sanding the board, sanding the putty, sanding the primer, sanding before and after the topcoat. The sanding step is critical.

The sanding process makes the board smoother and smoother, which is conducive to painting. Sanding after painting makes the surface of the paint film smooth and smooth. However, pay attention to avoid horizontal sand when sanding, and not use too thick sandpaper.

6. Topcoat construction

一定 Be sure to clean the wooden surface again before the topcoat construction to remove the dust particles, so that the surface of the paint film can have a better coating effect. Each time the topcoat is applied, it should not be applied too thickly at one time. It is best to apply it multiple times and wait for the paint film to dry before doing the next layer of construction.

The topcoat construction directly affects the final effect of the paint film. The topcoat construction requirements must be applied evenly, without sagging, good gloss, no obvious brush marks, and smooth and delicate touch.

三 、 Wooden paint painting details

1. Do not apply at the same time as latex paint

Tochigi lacquer products contain toluene diisocyanate (TDI). If wood lacquer and latex paint are applied at the same time, these free TDI will chemically react with the ingredients in the latex paint, making the wall of the latex paint yellow.

Therefore, wood paint and latex paint cannot be applied at the same time. It is recommended to brush the wood paint first and then the wall paint to prevent the components in the wood paint from contaminating the wall.

2, prevent hardware pollution

No matter what process is used, first use masking paper to protect the hardware on the workpiece to prevent the hardware from getting stained with wood paint.

In addition to the operation must be fine and timely clean the contaminated parts such as hardware, paint as much as possible, and then install door locks, handles and latches to ensure that the hardware is clean and beautiful.

3. Select matching products when deploying

When the wood varnish is used for construction, if it is water-based wood varnish, it only needs to be diluted with water in proportion. And if you choose nitro paint and polyurethane paint, you need to add related curing agents and diluents, and must be formulated in strict accordance with a fixed ratio.

Therefore, during the construction process, it is best to have the guidance of professionals. Strictly proportion and choose the matching thinner and curing agent to avoid problems such as bottom biting and wrinkling.

4. Filter after the wood paint is prepared

After the rafter lacquer is prepared, it is necessary to perform the filtering step. Because the dust in the air will form small particles after mixing into the wood paint, if it is directly applied without filtering, particles will appear on the surface of the paint film, and the surface is not smooth and flat.

Therefore, after the wood paint is prepared, it is necessary to use a filter bucket to filter out particulate impurities, and then it is best to carry out the construction after standing for more than ten minutes.

5. Different treatment of remaining paint

After using the water-based wood lacquer, the remaining lacquer can be stored in a cool place and kept for future use. The nitro paint and polyurethane paint can only be used for one time due to the addition of curing agents and thinners, and the remaining paint can only be disposed of.

Fourth, wooden painting

稍 In the construction of wood lacquer, a little carelessness may cause serious problems. How to avoid problems, and how to save them when they occur? Let's take a look at the causes of common problems in wood paint construction and how to solve them.

1, the problem of flaking

There are many sizes of particles on the surface of the paint film. Because the construction environment is not clean, dust falls on the paint surface; the paint tools are not clean, dust particles are inside the paint brush, and impurities are carried out with the paint during painting; the paint is left for too long after use and the surface condenses The patent leather is mixed into the paint, and the paint film appears granular after drying.

Solution: before painting, clean the site and wipe the workpiece clean; before painting, check the brush. If there are impurities, use a scraper to repeatedly remove the dirt from the brush and clean it with thinner; use it as soon as possible after the paint is prepared, it should be fully sealed. If it has skinned, you can use a scraper to remove a large piece of patent leather and filter the paint liquid before using it.

2, whitening problem

The color of the paint film is whiter than the original, and it is white mist. The reasons are that the construction equipment is not clean, contains oil or impurities insoluble in the paint, and the paint film may become white after drying; no supporting thinner is used, there are more low-boiling solvents, or the thin material contains too much moisture; the humidity of the construction environment Too large, it absorbs moisture when applying oily paint, which causes the paint film to become white when dry.

Solution: The construction equipment should be kept clean; use the matching diluent; choose slow-drying diluent, and add a small amount of anti-white water if necessary.

3.Pinhole problem

The paint film appears as pinhole-shaped holes. The reason for this may be that after painting, due to the high ambient temperature, the solvent suddenly volatilizes, and the paint film itself is too late to make up for the gap, forming a series of small holes, namely pinholes; the construction is not detailed enough, and the putty layer or primer layer is not smooth ; The relative humidity in the construction environment is too high or the oil-water separator of the spray equipment fails.

Solution: The temperature of the construction environment should not be too high. If it needs to be heated to accelerate the curing, it should be left at room temperature for about 20 minutes to allow the solvent to fully volatilize and then heated up. The putty coating should be smooth and smooth. There should be fewer pinholes for spraying; wait until the bottom layer is flat, fine and smooth, and then spray the upper layer of paint.

4. Cracking problem

裂纹 Cracks appear on the surface of the paint film after drying. The cause of this phenomenon may be that the moisture content of the wood is too high, the wood deforms after painting and the paint film cracks; the scraping putty is too thick, which causes the primer to crack; the primer is thickly applied once, when the paint film thickness exceeds a certain limit When the film performance is very brittle, it is easy to crack if the paint is not used according to the construction instructions.

Solution: Lastly check the moisture content of the wood before construction to ensure that the moisture content is lower than 15% before proceeding with the construction; no matter what kind of putty, avoid thick one-time scraping; avoid primer coating once thickly and thinly; multiple times according to the construction instructions Painted.

5. Other common problems and treatment

Brush marks: The bristles are too hard or the brush has been used for too long, leaving behind paint; the viscosity of the paint is too high, clean the brush or replace it with a new brush; add a small amount of water to dilute until the brush marks disappear.

Sagging: too much paint is too thick; too much water is added to the paint; high humidity, low temperature, dry brushes do not dip too much paint, the paint layer must be thin and uniform; dilution with water; full consideration of humidity and temperature .

Peeling: the wood contains too much oil and wax; the next coat is painted before the paint film is dry; the recoating interval is too long before the substrate is painted with a sealing primer to seal the substrate; pay attention to each time Sand the previous coat thoroughly before painting.

Orange peel: the paint is too thick; the solvent of the thinner is poor; the ambient temperature is too high; adjust the viscosity of the paint to a moderate level; use the thinner in combination; adjust the construction temperature