construction hpmc-Hydroxypropyl methylcellulose for interior and exterior wall putty powder
As the weather moves from autumn to winter, the weather turns cooler, and the climatic characteristics such as cold, rainy, and humid appear, and the temperature drops significantly. At this time, the internal and external wall putty powder project will encounter many wall problems during construction. What should be paid attention to when the project is constructed in winter
1. Winter construction conditions and requirements
For the construction of putty powder, a qualified base layer has five basic characteristics: firmness, smoothness, dryness, neutrality and cleanliness. For the construction conditions of putty powder: the temperature of the construction environment must be controlled above 5 ℃, and the environmental humidity should be controlled within 85%, otherwise the construction cannot be carried out.
Second, putty powder construction conditions and requirements
For the construction of internal and external wall putty powder, some projects still need to be constructed when the temperature is lower than 5 ℃ after entering winter due to the construction period. For the construction quality, the following matters should be paid attention to during construction:
1—Basic inspection and treatment
The basic treatment is the basis of the coating project. The content of the basic treatment includes: removing the dust, oil stains and loose objects on the surface of the basic layer; reducing or eliminating surface defects; improving the physical or chemical properties of the basic surface.
For the construction of the coating system, the substrate should be dry and the surface temperature of the wall should be ensured before construction in winter. When the temperature during the day is lower than 5 degrees, try to construct on the wall with direct sunlight, and the low temperature at night should be higher than 0 ℃, otherwise construction is not allowed to prevent the putty layer from being frozen.
3 – Sand the putty and judge the dryness
The putty must be completely dry before grinding, so that the non-stick sandpaper and the surface smoothness can be controlled after the putty is completely dry. If the putty is not dry or frozen, the putty will stick to the sandpaper during sanding, and the surface will not be easy to polish.
4—Construction of paint
Construction of the coating: Make sure that the substrate is completely dry before painting. The construction temperature of the water-based coating should be controlled above 5 °C. During the drying process, when the temperature is lower than 0 °C, the emulsion will freeze and lose its adhesion and film formation. function to ensure that the temperature during the film-forming and drying process cannot be lower than 0 °C.
5—Storage of paint
In winter paint construction, the paint stored on site should be uniformly placed indoors, and ensure that the indoor temperature is above 0 °C. When the temperature is lower than 0 °C, heating or electric heating must be used to increase the indoor temperature. It is strictly forbidden to use an open flame. high. Unused paint during construction should be placed indoors, and frozen products will not be used.
6—Paint film maintenance and finished product protection
The time for the paint film to reach drying and performance on the surface of the object is 7 days at a standard temperature of 25°C. In winter, when the temperature of the coating construction environment is generally low, the drying time of the paint film and the time to achieve good performance will be relatively extended. Here During the period, the pollution and bumps on the surface of the paint film should be minimized as much as possible, and the repair caused by pollution and bumps should not affect the overall effect. In winter construction, corresponding protective measures must be taken according to the construction conditions of the site to avoid freezing of the coating film as much as possible. In order to ensure the smooth progress of the project coating quality and construction progress.