硅橡胶喷霜物鉴定及喷霜原因分析

Characterization and analysis of silicone ruber blooming

采用红外光谱、高效液相色谱、飞行时间质谱对硅橡胶表面喷霜物进行了鉴定,结果表明:喷霜物为硅橡胶原材料二苯基硅二醇(GRC)脱水生成的三聚体和四聚体,且三聚体含量大于四聚体。喷霜物化学成分与GRC杂质相同,但GRC杂质不是导致喷霜的原因。通过扫描电镜和粒度分析表明,不同批次GRC结晶物颗粒粒径存在较大差异,而大粒径GRC容易发生喷霜。

The silicone rubber products blooming has been characterized by using Fourier transform infrared spectroscopy（FT-IR）,high performance liquid chromatography（HPLC） as well as time of flight-mass spectrometer（TOF-MS）.The blooming is found to be tripolymer and tetrapolymer of diphenyl silandiol,a kind of structural control agent in the rubber.There is more tripolymer than tetrapolymer in the bloom.The bloom is the same as the impuries in GRC but the impuries in GRC are not the main source resulted in the blooming.It may be resulted from the difference of granularity of GRC materials according to the results of scanning electron microscope（SEM） and laser diffraction particle analyzer.The bigger GRC grains are more inlcined to dehydrate and self-polymerize,then resulting in blooming.