摘要
以α,ω-二羟基聚二甲基硅氧烷为基础聚合物,配合填料、扩链剂、交联剂、偶联剂和催化剂等,制得低模量、高伸长率的室温硫化有机硅密封胶。较佳配方为:复配基胶用量100份,自制扩链剂用量4份,纳米碳酸钙用量90份,复配交联剂(MOS、VOS、POS质量比为5∶2∶3)用量8份。以此配方制得密封胶的拉伸强度为1.5 MPa,拉断伸长率993%,100%模量为0.27 MPa;经紫外光老化处理1 500 h后拉伸强度为1.3 MPa,其性能满足《高速铁路无砟轨道嵌缝材料》(征求意见稿)的要求。
The silicone sealant with low modulus and high elongation was prepared by a, to-hydroxy-temi- nated polydimethylsiloxane as the base polymer combined with the fillers, chain extender, crosslinking agent, coupling agent and catalyst. The formula was that 100 parts basic rubber,90 parts nano-caleium carbonate,4 parts chain extender,8 parts mixed crosslinking agent with the mass ratio of MOS, VOS and POS was 5：2：3. The silicone sealant prepared showed a good performance, tensile strength was 1.5 MPa, elongation at break was 993% , 100% constant modulus was 0.27 MPa and the tensile strength disposed by ultraviolet for 1500 h was 1.3 MPa. The performance meets the requirements of Joint material of the high-speed railway ballastless track （Draft）.
出处
《有机硅材料》
CAS
2017年第2期94-97,共4页
Silicone Material
关键词
有机硅密封胶
无砟轨道
嵌缝材料
低模量
高伸长
silicone sealant, ballastless track ,joint material, low modulus, high elongation
