THE CONSTRUCTION ENVIRONMENT OF SPRAYING POLYUREA FILM WATERPROOF LAYER

The spraying polyurea construction operation should be carried out under the conditions that the construction environment temperature is greater than 5°C, the relative humidity is less than 85%, and the base surface temperature is 3°C greater than the dew point temperature.

If the temperature of the construction environment is too low and the relative humidity in the air is too high, the moisture in the air is easy to condense on the surface of the base layer. Because the temperature of the material sprayed on the surface of the base layer is higher, and the crosslinking reaction exotherms, it is It is very easy to vaporize moisture, and then produce pinholes and holes in the rapid prototyping polyurea coating film defects, so it is particularly important to control the temperature and humidity of the construction environment.

During the spraying polyurea construction operation, if the wind speed is too high, it is difficult to operate, and the material is flying around, and it is difficult to form a uniform coating. Therefore, it is not suitable to perform spraying operations if the construction is in the open air environment with wind level 4 and above. Yes, spraying in the open air is strictly prohibited in rain and snow.