On May 30, 2025, Hangzhou - Against the backdrop of high maintenance costs for super high-rise buildings, the silicone sealant industry is undergoing a new round of technological innovation. The "photocatalytic self-cleaning sealant" launched by a certain enterprise has been applied at Hangzhou West Station, with a surface contact angle of 165 ° and a 90% reduction in dust adhesion compared to traditional materials. The maintenance cycle has been extended from 4 times a year to once every 2 years.


Function upgrade: from passive sealing to active protection
The new sealant is doped with titanium dioxide nanoparticles, which can decompose organic pollutants under ultraviolet irradiation and possess superhydrophobic properties. Laboratory simulation tests have shown that in acid rain (pH=3.5) environment, the weather resistance of materials is improved to 20 years, far exceeding the industry standard of 15 years. In addition, the "shape memory silicone" developed by a certain research institution can automatically fill the gaps in buildings when the temperature changes, solving the leakage problem caused by the thermal expansion and contraction of traditional materials.


Standard setting: China's plan has gained international recognition
In response to the lack of unified standards for the performance evaluation of intelligent sealing materials, the National Adhesive Standardization Technical Committee has released three group standards, including "Photocatalytic Building Sealant". Among them, the self-cleaning efficiency testing method has been included in the ISO international standard draft, marking a significant increase in China's technical discourse power in this field.