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The reason of the crack of adhesive joint
Class:News Date:2012-6-11 10:13:42
First, the impact of various operations may cause foaming
1 glue seam and base material humidity is bigger, there is rain water;
2 when the construction is not careful to cut the foam stick;
3 foam bars do not choose not foam with low density, must comply with the relevant norms of closed foam stick;
4 the thickness of the glue is not enough, too thin;
All of these factors can be avoided, in the construction must ensure that the glue seam and the substrate is dry, clean, pay attention to the operation of the bubble can not scratch, according to the size of the joint selection of the appropriate foam.
Two, the temperature caused by the general assembly of plastic foam.
First said summer. In summer, the daytime temperature is high, humidity is big, if in the morning or afternoon construction special blister easily, because in a certain temperature conditions by absorbing the moisture in the air curing silicone rubber weather. When in the morning or in the afternoon after sizing, then silica gel curing speed is very fast, the silicone rubber curing process will release a chemical substance formed gas, gathered together can not immediately escape colloid. This will cause bubble. This occurred in long wall sunny side and curtain wall component sizes on one side of the adhesive joint, in the evening, when the sun goes down sizing, can alleviate this phenomenon.
Due to the winter day and night temperature difference is too large, the temperature is low, the climate is dry, it may cause this phenomenon. Winter colloid curing the need for a long time, the colloid construction at the end of the fully cured, curtain wall of each unit component itself has certain displacement, coupled with the day and night temperature difference is too large to produce a greater displacement of colloidal not fully cured anti displacement ability is poor, thus forming gum weatherability slit drum phenomenon.
The above phenomenon only to part of the curtain wall plastic gap of the impact, but the performance of the gel does not produce any adverse results, the phenomenon will be eased with the temperature change.
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