From the eastern coast to the western land, new curtain walls can be seen everywhere to decorate modern buildings. From the Beijing Olympic Games to the Shanghai World Expo, all kinds of curtain wall buildings have witnessed the vigorous development of this industry. With the development of new technology, building curtain walls are developing towards high performance, thermal insulation and energy saving, and become more and more vital. The design of modern curtain walls has far exceeded people's imagination. The emergence of special-shaped curtain walls and multi-functional curtain walls has made this architectural form get rid of its supporting role in the past and become a major architectural topic.

        In the curtain wall design, the curtain wall sealing strip is used as an accessory of the entire building system. Although the amount used is small, its role cannot be underestimated. loss. The quality of the sealing strip often determines the sealing performance of the curtain wall. However, it is precisely because the amount of sealant strips is small, inconspicuous, and often not paid attention to, but they do not know that "the embankment of a thousand miles collapses in the ant's nest". The high-quality sealing strip is durable and can fully adapt to the outdoor environment of the curtain wall, ensuring the sealing performance.

        Sealant strips suitable for use on curtain walls should have excellent weather resistance and aging resistance, good elasticity, water resistance and corrosion resistance, and will not crack or harden after long-term use, so that the sealing performance can be maintained for a long time, thereby Minimize the possibility of water seepage. The sealing strip whose performance does not meet the requirements of the curtain wall will not cause any problems in the initial stage of curtain wall construction, but after a period of use, due to aging and hardening, cracks will occur, and the sealing strip itself will produce gaps. The effect no longer exists, thus introducing various forces to cause water vapor leakage, and it is impossible to talk about the overall sealing performance of the curtain wall. At the same time, because the curtain wall itself is expensive and the maintenance cost is not low, if the wrong sealing strip is selected because of the price, it will cause leakage problems and require maintenance and replacement, which will cost a lot, and the original price advantage will no longer exist. In the initial stage of curtain wall development in my country, such problems were not paid attention to, resulting in the current large-scale curtain wall needing rework and maintenance. In some areas, such maintenance projects are even larger than new curtain wall projects, which shows that choosing suitable materials is crucial for engineering construction. importance.

        Now the main types of sealing strips on the market are generally polyvinyl chloride, EPDM and silicone rubber. As the quality rises, the price also rises. The price gap of C has narrowed. From the point of view of performance, because PVC becomes hard and brittle with time, loses elasticity, is not resistant to aging, has poor weather resistance and low temperature characteristics, and does not meet the performance requirements of curtain wall sealing strips. The EPDM strip has its inherent defects, which are: large expansion in general mineral oil and lubricating oil, poor aging resistance, easy fracture of the rubber strip, poor extrusion resistance, weather resistance and aging resistance Poor, after a period of use, there will be oily and sticky phenomenon. Long-term use of the rubber strip will crack, age and deform, and it is prone to seal failure problems; the product has an odor, is highly polluting, has a short service life, and has a narrow operating temperature range; Especially the compatibility of materials. At present, structural adhesives for curtain walls or weather-resistant adhesives basically use silicone sealants, and the two are incompatible.



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