摘要
以2种不同黏度的乙烯基硅油复配物为基料、羟基硅油为发泡助剂、含氢硅油为交联剂、气相法二氧化硅为补强填料,添加铂催化剂、氮系无卤阻燃剂等制得液体硅橡胶阻燃泡沫材料,探讨了氮系无卤阻燃剂用量对硅橡胶泡沫材料物理性能、阻燃性能、泡孔形貌、热稳定性等的影响。结果表明,氮系无卤阻燃剂在硅橡胶泡沫材料体系中可充当抑制剂的作用,为制备样品提供更多的可操作时间;在用量相同的条件下,与氢氧化铝相比,采用氮系无卤阻燃剂更有利于制备密度低、压缩永久变形低、泡孔致密均匀的液体硅橡胶泡沫材料;随着氮系无卤阻燃剂用量从0增加到70份,硅橡胶泡沫材料的表观密度从0.240 g/cm^(3)升至0.545 g/cm^(3),微孔材料硬度从6.9度升至50.5度后有所回落,拉伸强度从115.6 kPa升至576.0 kPa后有所回落;随着氮系无卤阻燃剂用量从10份增加到70份,氧指数从24.4%升高到31.0%,垂直燃烧等级由V-2级提升到V-1级并最终达到V-0级;随着氮系无卤阻燃剂用量的增加,硅橡胶泡沫材料的泡孔均匀性和热稳定性降低,600℃时残余质量分数降低,添加10份、30份和50份氮系无卤阻燃剂的硅橡胶泡沫材料在600℃时残余质量分数分别为77.5%、65.4%和56.0%;氮系无卤阻燃剂的较佳用量为50份,此时硅橡胶泡沫材料的压缩永久变形为1.6%,25%压缩应力为66.3 kPa,拉伸强度为576.0 kPa,拉断伸长率为94.2%,氧指数为28.2%,垂直燃烧等级为V-0级。
The liquid silicone rubber flame retardant foam materials were prepared by two types of vinyl silicone oil with different viscosities, hydroxyl silicone oil, hydrogen-containing silicone oil, fumed silica, platinum and nitrogen-based halogen-free flame retardants. The effects of the nitrogen-based halogen-free flame retardants on the physical property, flame retardant property, cell morphology, and thermal stability of silicone rubber foam were discussed. The results show that when the nitrogen-based halogen-free flame retardant is used as an inhibitor in the silicone rubber foam materials, it providing more operational time for the preparation;under the same conditions, compared with aluminum hydroxide, nitrogen-based halogen-free flame retardants are more conducive to prepare liquid silicone rubber foam materials with low density, low compression set, and dense and uniform cells. As the nitrogen-based halogen-free flame retardants increases from 0 to 70 parts, the apparent density of the silicone rubber foam materials increases from 0.240 g/cm^(3) to 0.545 g/cm^(3), the hardness increases from 6.9 degrees to 50.5 degrees then decreases, and the tensile strength increases from 115.6 kPa to 576.0 kPa then decreases. The amount of halogen-free flame retardant increases from 10 parts to 70 parts, the oxygen index increases from 24.4% to 31.0%, the vertical combustion raises from level V-2 to V-1l and finally reaches V-0. As the halogen-free flame retardant increases, the cell uniformity and thermal stability of the silicone rubber foam materials decreases, and the residual mass fraction decreases at 600 ℃. When 10 parts, 30 parts and 50 parts of nitrogen-based halogen-free flame retardant is added, the residual mass fractions of the silicone rubber foam at 600 ℃ is 77.5%, 65.4% and 56.0% respectively. When the nitrogen-based halogen-free flame retardant is 50 phr, the silicone rubber foam materials has compression set of 1.6%, 25% compressive stress of 66.3 kPa, the tensile strength of 576.0 kPa, the elongation
作者
刘朵朵
徐哲
张雷
付中禹
LIU Duoduo;XU Zhe;ZHANG Lei;FU Zhongyu(School of Chemical Engineering,Changchun University of Technology,Changchun 130012,Jilin;Jilin Province Product Quality Supervision and Inspection Institute,Changchun 130103,Jilin)
出处
《有机硅材料》
CAS
2023年第1期53-60,共8页
Silicone Material
关键词
液体硅橡胶
氮系无卤阻燃剂
发泡反应
交联反应
liquid silicone rubber
nitrogen-based halogen-free flame retardant
foaming reaction
crosslinking reaction
