PU furniture paint construction common problems and solutions!

PU furniture paint is the mainstream of the current furniture painting, however, polyurethane paint in the construction, or a few days after construction, a few days, a few months or even longer, there may be problems, affecting the image of furniture in the minds of consumers, and will cause many complex claims, returns, compensation and other economic disputes, bringing great economic losses and reputation damage.

1. Stream hanging

Cause of the problem:

one Too much dilution;

2. Paint film is too thick, respray time interval is too short;

3. The nozzle is too large, and the distance to the surface is too close;

4. Spraying speed is too slow

5. The surface is uneven and greasy.

The solution:

1. Diluent should be added proportionally;

2. Each paint is not easy to be too thick, each interval is 10 minutes;

3. Choose a 1.5-2.0mm nozzle, and keep the nozzle 20-625px with the object surface;

4. Control the spraying speed;

5. Clean the surface of the material.

2. Loss of light

Cause of the problem:

one The construction environment is dusty;

2. The nozzle is too small, the pressure is too large, the paint materialization can not open;

3. The nozzle is too close to the surface;

4. The finished paint is placed too long.

The solution:

1. Keep the construction environment clean and ventilation more reasonable;

2. Select the right nozzle and adjust the pressure (0.15-0.2mp);

3. The distance between the nozzle and the object surface is 20-625px;

4. Do not mix too much paint each time, and the prepared paint is best used up within 4 hours.

3. Foaming

Cause of the problem:

one The construction environment is dusty;

2. The nozzle is too small, the pressure is too large, the paint materialization can not open;

3. The nozzle is too close to the surface;

4. The finished paint is placed too long;

5. Short coating interval between layers;

6. The wood is poorly sealed, and the gas on the white billet expands outward after the paint film is formed.

The solution:

1. The surface should be dry, and the humidity of the substrate should not be too high;

2. Humidity should not be too large to avoid contact between paint and water;

3. Use oil-water separator to drain regularly;

4. The finished paint should be left for 5-20 minutes before use;

5. Apply a closing primer before painting.

4. Bite the bottom

Cause of the problem:

one The paint is too thick and the dilution dose is too low;

2. The nozzle pressure is too large or too close to the surface;

3. The construction ambient temperature is too high.

The solution:

1. To match the use of primer and top paint, coating interval should be appropriate;

2. The paint film should not be too thick, and the primer should be fully dried before it is painted.

3. The amount of curing agent added can be appropriately increased.

5. Orange peel

Cause of the problem:

1. The construction environment is dusty;

2. The nozzle is too small, the pressure is too large, the paint materialization can not open;

3. The nozzle is too close to the surface

4. The finished paint is placed too long;

The solution:

1. Increase the diluent or add a small amount of leveling agent;

2. Adjust the nozzle pressure, not too close to the object surface;

3. Pay attention to the construction environment temperature.

6. Pinholes

Cause of the problem:

one Substrate unclean, compressed air unclean;

2. The amount of curing agent added is large, but the amount of diluent added is small.

3. After the paint is ready, the standing time is short.

4. The coating is too thick, and the interval is not enough when spraying multiple layers;

5. The putty has not dried sufficiently.

6. The ambient temperature and humidity are too high.

The solution:

1. Handle the substrate well and pay attention to the cleanliness of compressed air;

2. Correctly grasp the ratio of paint;

3. Let the finished paint stand for 10 minutes before use;

4. Spray twice, the interval should be appropriate;

5. Let the putty dry thoroughly;

6. Summer temperature is too high, to reduce the curing agent accordingly, increase the diluent.