超细绢云母/加成型液体硅橡胶复合材料的制备及性能

Preparation and properties of ultrafine sericite/addition liquid silicone rubber composites

以天然绢云母矿物为原料,利用气流磨超细粉碎、乙烯基三乙氧基硅烷表面修饰处理对绢云母进行深加工,得到有机化的绢云母超细粉体,再采用溶液聚合方法制备出具有优良性能的超细绢云母/加成型液体硅橡胶复合材料。用SEM对其微观形貌进行了观察和分析,通过观察SEM可以发现经偶联剂表面修饰处理后超细绢云母在硅橡胶基体中分散均匀。当超细绢云母质量分数为8%时,复合材料的拉伸强度和邵氏硬度达到了1.25 MPa和61,分别比纯硅橡胶提高了197.62%和48.78%。TGA测试结果表明,超细绢云母可显著提高硅橡胶的热稳定性能。此外,用Kraus方程对超细绢云母与硅橡胶之间的相互作用进行了表征。

Using natural sericite mineral as raw material, through crashing and surface chemical modification, the ultrafine sericite powders were obtained. The excellent liquid silicone rubber reinforced by uhrafine sericite was prepared through solution polymerization. The mierostruetures and properties of eomposities were investigated by SEM; because the surface of sericite particles was modified with organic functional groups, they can disperse in the silicone rubber perfectly. The mechanical properties of composites, such as tensile strength and hardness（Shore A） are improved prominently. Compared to silicone rubber unreinforced, when the mass fraction of ultrafine sericite was 8%, tensile strength and hardness（Shore A ） have improved 197.62% and 48.78%. The result of TGA shows that the thermal stability was superior to that of silicone rubber without any fillers. The interaction between uhrafine sericite and silicone rubber was characterized by the Kraus equation. The Kraus curve shows that there is interaction between uhrafine sericite and silicone rubber.