What are the reasons for poor adhesion between the sealant and the substrate?
What are the reasons for poor adhesion between the sealant and the substrate?
1) No adhesion test was performed before construction or the construction was not carried out according to the method recommended by the adhesion test. During construction, it is necessary to strictly follow the method recommended by the adhesion test;
2) During the construction process, cleaning or applying the primer does not conform to the construction process. Clean it according to the “secondary rag method” and proceed to the next construction within 1 hour; apply the primer thinly and evenly, and proceed to the next construction within half an hour;
3) After the finished unit is completed, the curing temperature is low or the curing time is short. The curing time of the finished unit is determined based on the rubber tapping test. When the curing temperature is low, the curing time may take 5 to 7 days. In addition, applying the primer can shorten the curing time;
4) There are many batches of materials (aluminum, glass, sealant, cleaning agent, primer, etc.) used in the construction process, and there may be differences. Strictly use materials consistent with the adhesion test. During the production process, each material entering the factory needs to be randomly tested for on-site adhesion.