Winter coatings should also "keep warm", you need to know these construction techniques!

The weather has entered winter

Notes on the use of winter paint

When the weather turns cold, rain, snow, humidity, frost and other climatic characteristics begin to appear, according to the specification, the average daily temperature for five consecutive days will be below 5 ℃ and the winter construction will begin

Storage conditions of winter paint

1.

The on-site paint should be placed in the indoor sorting and stacking.

2.

Ensure that the indoor temperature is above (5°C).

The unused paint in winter construction should be placed indoors, and the frozen product cannot be used again

The requirements of winter coating construction on the base layer

1.

For paint construction, a qualified base has five basic characteristics: smooth, dry, neutral, clean, and firm (it is necessary to pay more attention to the moisture content and alkalinity of the base during winter construction)

2.

Water-based coatings can be applied to the base layer for coating construction, and the moisture content is generally controlled below 10%.

Under normal circumstances, the newly made concrete or cement mortar base needs to be cured for at least 4 weeks in winter, and 2 weeks of dry maintenance period in summer (you can use the base moisture content tester to test)

3.

The pH value (alkaline) of the grassroots level should be below 10
.
Moreover, the alkalinity of the base is also closely related to the water content of the base
.
Therefore, pay close attention to the water content of the grassroots level, too high will cause efflorescence problems (the PH test paper can be used to test)
.

Environmental requirements for coating construction in winter

1.
Exterior wall coating construction environment

The temperature during exterior wall coating construction and film formation must be higher than 5°C (more specific requirement is that the base layer temperature must be higher than 5°C, because the ambient temperature and the base layer temperature are not synchronized), so the overall winter period is not suitable for exterior wall coating construction Of
.

In special circumstances, when it is necessary to rush the construction period, pay attention to reasonable arrangements for the construction time and work surface (the construction time is generally controlled to start after 10 am and end at 15 pm, and set aside time for the coating surface to dry to prevent the construction from ending too late , Frozen at night; it is generally advisable to follow the direct sunlight on the construction work surface)
.

2.
Construction air humidity

During construction in winter, the relative humidity of the ambient air should be less than 85%.
Construction is not allowed in humid weather such as rainy and haze
.

3.
Construction environment temperature

The temperature of the construction environment in winter must be more than 3℃ above the dew point temperature (when the dew point temperature is reached, the water vapor in the air will condense on the surface of the coating, which will affect the normal film formation of the coating, and it is easy to appear whitening, tear marks, etc.
, and it will be very late.
Difficult to eliminate)
.

4.
Construction wind speed requirements

Coating construction requires wind speed below level 4 (6M/S)
.
When painting the exterior walls of high-rise buildings, generally the higher the height, the greater the wind speed.
Strong wind will reduce the strength of the coating film, which will affect the leveling and normal film formation of the coating film.
At the same time, the air and dust flying on the construction work platform will be affected.
Adhere to the wet coating surface to cause pollution
.