Glorystar · Causes and solutions for “bulging” of aluminum veneer sealant
Reasons for “bulging” of aluminum veneer sealant
01
Temperature difference is too large
The thermal expansion coefficient of aluminum panel curtain wall is high, about 2-3 times that of glass. Therefore, the thermal expansion and contraction displacement of aluminum panels of the same size is much larger than that of glass. In most areas of our country, due to the alternation of seasons, the temperature difference between day and night is large, and the aluminum plate has a large interface displacement due to thermal expansion and contraction. After the glue seam is injected with glue, the displacement of the interface is actually borne by the glue seam. When the glue is not completely cured, excessive and repeated expansion and contraction displacement of the plate will cause the glue seam to bulge.
0 2
foam wand mismatch
When filling the foam rod in the glue joint before applying glue, if you choose a longer foam rod, the movement of the foam rod before the glue is cured will cause the sealant to bulge. In addition, if the size of the foam rod does not match the size of the interface, the foam rod will be pulled too tight during the lining process, and then the glue will be applied immediately. The rebound of the foam rod in the later period will also cause the sealant to bulge.
03
Too much wind pressure
In addition to the influence of temperature factors during the application process, the sealant can also cause bulging due to excessive wind load. Most cities in our country are in monsoon areas, and curtain wall buildings will sway slightly due to external wind pressure, causing the panels of high-rise curtain walls to shift. If the glue is applied when the wind is strong, the sealant will bulge due to the displacement of the plate before it is fully cured. Especially in the gluing process of high-rise buildings, such problems are more likely to be highlighted.
Solution
(1) Choose glue that cures relatively quickly;
(2) Use appropriate sunshade measures;
(3) Choose the appropriate gluing time and try to avoid construction at higher or lower temperatures. You can choose to apply gluing on a facade away from direct sunlight, or perform construction in cloudy weather;
(4) Apply glue twice to the bulging glue joints that affect the overall appearance of the curtain wall. Those that do not affect the overall appearance can be left as they are;
(5) The thickness of the glue should not be too thick (nor less than 5mm), and the glue surface should form an hourglass shape;
(6) When the colloid has not completely solidified after gluing, try to avoid external force causing the plate to move.
关于广州Glorystar
Guangzhou Glorystar Industrial Co., Ltd. was established in June 1996 with a registered capital of 11 million yuan. It mainly produces high-quality silicone sealant (one of the drafting units of the national standard GB16776 “Silicone Structural Sealant for Construction” and “National Standard Silicone Construction Sealant” GB/T14683) and modified starch powder (industry standard “Putty Additive for Interior Decoration” JC/T 2316-2015), it is one of the few “certified enterprises for the production of silicone structural sealants for construction” in China and the largest and only modified starch powder manufacturer certified by four national ministries and commissions. It is also a national high-tech enterprise, a key high-tech enterprise in the National Torch Plan, and a national outstanding private technology enterprise.
