1. Silicone structural sealant and profile (sub-frame), glass does not bond, structural glue and profile, glass does not bond or poorly bonded, the following reasons are summarized:

　　①The construction is not standardized, for example, the adhesion test is not done before the construction, the substrate is not cleaned as required, and the cleaned glass is not immediately combined. Solution: Ensure that the substrate is cleaned, and carry out construction according to the specifications;

　　②During the construction process, the method of cleaning or applying the primer liquid does not conform to the construction process. Solution: Clean in accordance with the "secondary rag method", and carry out the next construction within 1 hour; the primer should be thin and uniform, and the next construction should be carried out within half an hour;

　　③Substrate material problems, such as differences in substrates of different batches, etc. Solution: Strictly use materials consistent with the adhesion test. During the production process, different batches of materials need to be randomly tested on site;

　　④ There is uneven mixing during the injection process of the two-component structural adhesive. Solution: Make sure that the A and B components are evenly mixed through tests before injection;

　　⑤ The addition of component B of the two-component structural adhesive is too much or too little beyond the allowable ratio range of the manufacturer. Solution: Make sure that the ratio of component A and component B is within the specified ratio range of the manufacturer by breaking time test before injection;

　　⑥ The low ambient temperature causes the initial bonding speed to be slow, or the curing time is short, and it does not bond during the tapping test. Solution: Increase the use and maintenance environment temperature (especially one-component).

　　2. Silicone structural sealant cures slowly

　　Silicone structural adhesive is slow to cure. According to years of technical service experience, most of the reasons are the following three categories:

　　①Slow curing speed caused by low ambient temperature and humidity. Solution: increase the use environment and the temperature of the maintenance environment, such as using a confined space to set up a heating room, air conditioning heating, etc., to keep the maintenance environment temperature at 10-40°C, and humidity at 50-90%;

　　②Slow curing speed caused by low ambient temperature and humidity. Solution: Check whether the ratio of component A and component B is normal through the break time. Within the range allowed by the manufacturer to adjust the ratio, the ratio of component B can be appropriately increased to speed up the curing speed.

　　③The silicone structural adhesive has expired or its quality is defective. Solution: Check the production batch number of the glue, confirm whether the glue is within the warranty period, and select a silicone structural glue with guaranteed quality and brand. To

　　3. Insufficient bonding width of structural adhesive: the actual width is smaller than the design width

　　There are two main reasons for the insufficient bonding width of the structural adhesive:

　　①　The glue is not full. Solution: The glue is injected continuously and evenly, and the glue nozzle can reach at least half the depth of the seam. After the glue is injected, it should be trimmed.

　　②　Seam assembly size is too small. Solution: Strictly assemble the seams in accordance with the size of the glue seam design. To

　　4. There are bubbles or cavities in the structural colloid

　　There are two main reasons for the bubbles and cavities in the structural colloid:

　　①　The glue is not full. Solution: Same as above.

　　②　 Air is mixed into the glue dispenser, and dense bubbles appear in the colloid. Solution: To ensure that the glue dispenser is trouble-free, exhaust the air before using after changing the barrel. To

　　The above-mentioned problems are all problems that seriously endanger the safe application of structural adhesives. During the construction process, it is necessary to ensure that the bonding size of the structural adhesive meets the design requirements, and the injection is full without bubbles or cavities. It is hoped that customers should avoid these problems in the process of using glue to ensure the safety of the curtain wall.

　　Silicone structural sealant is very important to the quality and safety application of hidden frame curtain wall. Choosing "good glue" is a prerequisite for ensuring quality and safety, and "using good" glue is an important process to realize the safe application of hidden frame curtain walls.