氢氧化镁/氢氧化铝复配阻燃剂对可陶瓷化硅橡胶阻燃抗震性能的影响

Effect of magnesium hydroxide/aluminum hydroxide compounding flame retardant on flame retardant and seismic performance of ceramicizable silicone rubber

以硅橡胶(SR)为基体,添加莫来石纤维(MF)、空心玻璃微珠(GB)、碳酸钙(CaCO_(3))、2,5⁃二甲基⁃2,5⁃双(叔丁基过氧基)己烷、铁红(Fe_(2)O_(3)),制备了母炼胶。通过添加不同份数比的氢氧化铝[Al(OH)3]和氢氧化镁[Mg(OH)_(2)],经过密炼、开炼、硫化制备了可陶瓷化阻燃有机硅橡胶复合材料。结果表明,所制备的可陶瓷化阻燃硅橡胶复合材料中,GB在高温下能够起到黏结桥梁的作用,MF能很好地起到骨架作用,添加30份Mg(OH)_(2)的硅橡胶复合材料,其拉伸强度可达4.93 MPa,同时具有1450.73%的断裂伸长率,而极限氧指数(LOI)值可以达到31.8%,水平垂直燃烧达到V⁃0级,硅橡胶复合材料在50 Hz频率、5 g加速度、1050℃的温度下燃烧15 min,试样不被烧穿。

A type of master rubber was prepared using silicone rubber(SR)as a matrix and mullite fiber(MF),hollow glass microbeads(GB),2,5⁃dimethyl⁃2,5⁃di(tert⁃butylperoxy)hexane,CaCO_(3),and Fe_(2)O_(3)as additives.Then,ceramic⁃retardable flame⁃retardant silicone rubber composites were prepared by adding Al(OH)3 and Mg(OH)_(2)at different parts ratios through open mixing and vulcanization.The results indicated that GB played a role of bonding bridge at a high tem⁃perature and MF acted as a skeleton in the preparation of the ceramic⁃retardable flame⁃retardant silicone rubber compos⁃ites.The rubber composite containing 30 parts of Mg(OH)_(2)obtained a tensile strength of up to 4.93 MPa,elongation at break of 1450.73%,and a limiting oxygen index of 31.8 vol%.The silicone rubber composite with a thickness of 6 mm could burn for 15min at a frequency of 50 Hz,5 g acceleration,and a temperature of 1050℃without burning through.