radiation shielding structure sealing room temperature curable organopolysiloxane composition and radiation shielding structure

摘要

PROBLEM TO BE SOLVED: To provide a room temperature-curable organopolysiloxane composition excellent in radiation shielding ability while maintaining sealing performance.;SOLUTION: A room temperature-curable organopolysiloxane composition for sealing a radiation shielding structure includes (A) 100 pts.mass of a diorganopolysiloxane whose both molecular terminals are blocked with hydroxy groups and/or hydrolyzable groups; (B) 120-1,000 pts.mass of barium sulfate; (C) 0.5-100 pts.mass of silica having a BET specific surface area of 10 m²/g or more; and (D) 0.5-30 pts.mass of silane, expressed by R_aSiZ_4-a (in formula, R is a 1-12C monovalent hydrocarbon group; Zs are each independently a hydrolyzable group; and a is an integer of 0-2) having two or more hydrolyzable groups in one molecule, and/or partial hydrolyzate thereof.;COPYRIGHT: (C)2014,JPO&INPIT