| 摘要 |
PROBLEM TO BE SOLVED: To provide an easy-to-construct fireproof covering sheet for a steel frame, which can impart two-or-more-hours fireproof performance to the steel frame even with a thickness of 4 mm or less. SOLUTION: In the fireproof covering sheet 1 for the steel frame, a shape-retention expanded layer and a heat-insulating reinforcing layer are laminated together. The shape-retention expanded layer contains a 100 pts.wt. thermoplastic resin and/or a rubber, thermally-expansible graphite, 20-200 pts.wt. ammonium polyphosphate, and 20-200 pts.wt. calcium phosphate; and the weight ratio of calcium phosphate and ammonium polyphosphate is in the range of 0.6-1.5. The heat-insulating reinforcing layer contains 100 pts.wt. thermoplastic resin and/or a rubber, thermally-expansible graphite, 20-100 pts.wt. ammonium polyphosphate, and 40-300 pts.wt. calcium phosphate; and the weight ratio of calcium phosphate and ammonium polyphosphate is in the range of 2.0-10.0. The thickness ratio of the shape-retention expanded layer and the heat-insulating reinforcing layer is in the range of 1.1-10. COPYRIGHT: (C)2007,JPO&INPIT
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