Structural silicone sealant for building

The invention discloses a structural silicone sealant for building, which comprises the following components by weight part: 80 to 120 parts of hydroxy-terminated polydimethylsiloxane, 10 to 80 parts of alkyl-terminated polydimethylsiloxane, 5 to 20 parts of cross-linking agent, 0.3 to 5 parts of coupling agent, 0.01 to 0.2 part of catalyst, 100 to 300 part of active filler and 0.01-10 parts of ultraviolet absorber. The structural silicone sealant of the invention can withstand various force bearing forms and has long service life, and the quality guarantee time is 25 years; and the standard condition tensile bond strength exceeds the national requirements and can reach 0.8 to 3.0MPa, and the elongation exceeds 100%. The structural sealant of the invention can be used for the structural assembly of curtain walls of high-rise buildings, large-size glass curtain walls and building curtain walls with complex structures, the installation sealing of air-pressure-resistant glass of automobiles, ships and the like,