Common problems and prevention methods of waterproof coating construction!

First, with the grass-roots bonding is not secure
specific phenomenon:
paint and grass-roots stick or foaming or bonding force is not enough
prevention and control measures:
1, grass-roots must be cleaned up
2, check the strength of the grass-roots, not sand, start Leather, loose
3, water-soluble coatings must not have clear water
4, solvent-based coatings must be dry at the base
5, the first coating must use the base material
2, the thickness is not equal
specific phenomenon:

After the paint is alive, the thickness is not uniform
prevention and control measures:
1, the grass must be flat, there must be no holes
2, painting must be divided into life
3, paint consistency adjusted according to time
Third, the specific phenomenon of
:
paint has moths, coating film construction, coating film contains small particles
prevention and control measures:
1, not to use expired or after stirring time of use of the paint
2, Two-component material manual stirring or mechanical stirring is not in place, pay attention to check the mixing material
3, use unclean barrel stirring, pay attention to the cleaning of the mixing barrel
4, the ratio is not correct, should be correctly matched to
4, coating layering
Specific phenomenon:
coating film construction after the film layering, or blistering between the coating film
prevention and control measures:
1, every time in the process of life before the construction clean-up is not in place
2, before Once again has become a waterproof film is not completely dry
5, slow drying speed
specific reasons:
because the single-part acrylic coating is volatile into a film through water, high humidity, low temperature environment, hindering the paint moisture wave hair, so the drying speed is relatively slow
prevention and control measures:
1, strengthen indoor ventilation conditions can be more suitable for the play of water
2, take thin coating and multilateral brushing, more suitable for the volatile water, In the construction must wait until each coating film drying and then brush the next
3, to use cement-based paint for construction, or use other waterproof paint


1, the grass-roots did not deal with clean, there are a large number of floating soil
2, a brush too thick, resulting in the coating film drying process, moisture volatility leads to coating cracking
3, outdoor construction, external conditions have strong winds Such weather, easy to lead to cracking
prevention and control measures:
1, before construction to remove the grass-roots floating soil, with paint bottom coating treatment of the grass-roots, take the method of many thin brushing
2, avoid windy weather in the outdoor construction
Waterproof paint into tofu slag phenomenon
specific reasons:
paint water is too large, resulting in the paint of liquid and powder separation, powder sinking, as if tofu slag
prevention and control measures:
control water, Strictly in accordance with the product instructions for use
building waterproof paint in the process of use, due to improper storage methods or incorrect construction methods, will cause a variety of qualitative changes. Jiandu waterproof to summarize the building waterproof coating lesions and treatment methods are as follows:
1
storage lesions and treatment methods
waterproof paint into the field, if there is no immediate construction or the waterproof material production date is far from the time of the infield, may produce the following quality changes.
01
the pigment
to the bottom can no longer be dispersed
The
. The main causes are:
(1) paint during the storage period did not stir or shake insufficiently,
(2) stored too long or too high temperature,
(3) improper dilution or dilution with inappropriate materials. In order to prevent the precipitation of waterproof coatings, should avoid overheating or long-term storage, according to the manufacturer's instructions to store waterproof coatings.
02
skin
waterproof coating during storage, due to the container is not closed, storage ambient temperature is too high, will be in the container skin. The methods to prevent the skining of waterproof coatings are:
(1) to avoid unnecessary opening of paint barrels,
(2) to ensure the sealing of the container, and
(3) to store according to the specified appropriate conditions.
2
lesions and treatment methods
01
slow drying and back-sticking
waterproof paint brush, paint film beyond the specified time is still dry, called slow dry. If the paint film has been formed, but there is still a sticky finger phenomenon, called back-stick. The reasons for this are as follows:
(1) paint film is too thick,
(2) before the paint has not been dried out and painted a second time,
(3) drying agent improper use,
(4) the grass surface is not clean,
(5) the base surface is completely dry. The treatment method is: (1) for mild slow drying and back-sticking, can strengthen ventilation, appropriately raise the temperature;
02
the paint
the paint coating and the paint film becomes powdery. The main reasons are:
(1) paint resin weather resistance is poor,
(2) wall surface treatment is not good,
(3) painting temperature is too low, resulting in bad film,
(4) paint paint too much water. The solution to the powdering is to clean up the powder first, then use the oily wall primer with good performance to base, and finally paint two better weather-resistant internal and external wall coating.
03
discoloration and discoloration
paint film discoloration or fading is due to:
(1) substrate humidity is too high, water-soluble salt crystallization on the surface of the wall caused discoloration and discoloration;
(2) the substrate material is alkaline, which infringes on the pigment or resin that is resistant to weak alkalineness,
(3) the climate is bad, and
(4) the coating material is not selected properly. If you see this phenomenon in the construction, you can first wipe off or shovel the surface of the problem, let the cement completely air-dried, and then add a layer of water-related or oily wall primer.
04
Peeling and peeling
due to the high humidity of the substrate material, the surface treatment is not clean, coupled with incorrect brushing methods or the use of poor quality primer, will cause the paint film from the base surface. In this case, should first check whether the wall leakage, if there is leakage, should first solve the leakage problem. Then peel off the paint and loose material, fill the faulty surface with durable putty, and then use oily wall primer to base.
05
foaming
paint film dried through, the surface appears different size protruding bubble points, with hand pressure, feel slightly elastic. The reasons for this are:
(1) grass-roots moisture, moisture evaporation caused by paint film foaming,
(2) spraying, compressed air has water vapor, mixed with waterproof paint,
(3) primer finished, encountered rain and painted paint, when the primer dry knot, the production of gas will be painted up. The treatment method is: slight paint film foaming, can wait for the paint film after drying through the water sand paper polishing flat, and then finish the paint;
06
flow hanging
at the construction site, paint can often be found from the wall hanging or dripping down, forming a tear-like or ripple-like appearance, commonly known as tears. The reasons for this are:
(1) paint film is coated too thick at once,
(2) dilution ratio is too high,
(3) is painted directly on the surface of the old paint without polishing. The solution is:
(4) is coated several times, each time thin and thin layer;
(5) reduces the dilution ratio;
(6) sandpaper to polish the old paint of the brushed object.
07
wrinkles,
paint film forms undulating wrinkles. The reasons are:
(1) the paint film is too thick, the surface shrinks,
(2) when the second layer of paint, the first layer has not dried through,
(3) dry temperature is too high. In order to prevent this situation, should avoid applying too thick, brush should be uniform. Brushing two paint intervals must be sufficient, to ensure that the first layer of paint film completely dry before applying the second.
08
layer
layer is also known as bite bottom. The cause of the layering phenomenon is: when brushing the bottom paint is completely dry, the thinner of the surface dissolves the lower primer, so that the paint film shrinks and peels. The solution is the same as the method of preventing wrinkles, the coating construction must be carried out at a specified interval, the coating should not be too thick, the primer is completely dry and then coated.