Silicone sealant will have various problems during the application process. Drumming is a common phenomenon. It is characterized by uneven surface, affecting the appearance, and the internal bond is not strong, and the opening and closing phenomenon will occur. Can not be ignored. What is the cause of the silicone sealant in the drum?

    First, when the silicone sealant cures slowly, the surface may have solidified and the interior has not yet fully cured. At this time, if the seam is subjected to a large width and narrow change, the surface of the seam will be affected, and unevenness may occur, sometimes the middle of the entire seam is bulged, sometimes a continuous bulge, and sometimes a twisted deformation.

    Second, the construction environment is relatively humid. When the environment is wet, the silicone sealant cures slowly. For example, in spring and autumn in northern China, the relative humidity of the air is low, and sometimes it is even 30% RH for a long time, so it is not suitable for construction in rainy weather.

    Third, the environmental temperature difference is large. The thermal expansion and contraction of the interface causes the displacement of the plate, especially for the aluminum-plastic composite plate, which has a large expansion coefficient. When the temperature difference between day and night is large, the thermal expansion and contraction of the aluminum-plastic composite plate becomes more and more obvious, so that the unvulcanized silica gel is stretched. Compressed and wrinkled to form a ribbed grain, so that the surface of the sealant is uneven.

    Fourth, the size and shape of the plate. For example, a large aluminum plate causes a large deformation of the joint, and the joint deformation of the shaped aluminum plate is larger than that of the flat aluminum plate. When the seam is narrow, the proportion of the width variation of the seam caused by the same panel size deformation will be too large, resulting in different internal curing, resulting in drumming.