聚异氰脲酸酯-白炭黑新型纤维强化深冷绝热材料的研究

Study on New Fiber Reinforced Cryogenic Insulation Material of Polyisocyanurate-Precipitated Silica

聚异氰脲酸酯添加3wt.%白炭黑(沉淀式二氧化硅)、1.5wt.%金红石型二氧化钛和1wt.%短切纤维复合成纤维强化深冷绝热材料,并对复合材料的性能进行了表征。结果表明,复合材料的表观密度为46.85kg·m^(-3),压缩强度为0.63MPa,导热系数为0.023W·m^(-1)·K^(-1),氧指数为31.2%;复合材料相比聚异氰脲酸酯泡沫虽然表观密度略有增加,但因纤维强化及填充泡沫空隙其压缩性能有较大的提高;其次,因其添加一定量的低导热系数白炭黑和阻隔红外辐射的二氧化钛,复合材料的导热系数降低,因添加了无机材料白炭黑和二氧化钛,复合材料的氧指数变高。本研究对聚异氰脲酸酯-白炭黑新型纤维强化深冷绝热材料在深冷管道中的应用提供了理论依据。

Added 3wt.%precipitated silica,1.5wt.%rutile titanium dioxide and 1wt.%chopped fiber in polyisocyanurate to composite into fiber reinforced cryogenic insulation material,the performance of the composite material was characterized.The results show that the apparent density of the composite is 46.85kg·m^(-3),the compressive strength is 0.63MPa,the thermal conductivity is 0.023W·m^(-1)·K^(-1),and the oxygen index is 31.2%.Although the apparent density increases slightly,its compressive performance is greatly improved due to fiber reinforcement and filling of foam voids;secondly,because of the addition of a certain amount of low thermal conductivity precipitated silica and titanium dioxide that blocks infrared radiation,the thermal conductivity of the composite material is reduced,and the oxygen index of the composite material is higher on account of the addition of inorganic materials such as precipitated silica and titanium dioxide.This study provides a theoretical basis for the application of polyisocyanurate-precipitated silica new fiber reinforced cryogenic insulation materials in pipelines.