膨胀蛭石偶联的羟基封端硅橡胶及其阻燃性能优化研究  

Hydroxyl terminated poly(dimethylsiloxane) crosslinked by expanded vermiculite and its flame retardant performance optimization

作　　者：郭东杰[1] 王彦辉[1] 白宝丰[1] 闫春绵[1] 史波[2] 方少明[1] 

机构地区：[1]郑州轻工业学院材料与化学工程学院,河南郑州450001 [2]南京航空航天大学能源与动力学院,江苏南京210096

出　　处：《轻工学报》2016年第2期21-28,共8页Journal of Light Industry

基　　金：973国家重点基础研究发展计划(2014CB239600);教育部"长江学者和创新团队发展计划"创新团队(IRT1187);河南省重点攻关项目(132102210240)

摘　　要：以羟基封端硅橡胶为主体、高温膨胀蛭石(EV)为添加剂、四乙氧基硅为偶联剂,经两步缩合反应制备了蛭石/硅橡胶复合弹性体(EV-PDMS),并对其阻燃性能进行了研究.经分别用全反射衰减红外光谱、水接触角、扫描电子显微镜对制备物进行测试,结果表明:膨胀蛭石的片状晶体均匀地分散于硅橡胶的内部,它们之间形成了稳定的Si—O—Si共价键,掺杂后的EV-PDMS弹性体表面维持了高度的憎水性能.力学性能测试表明:60份EV掺杂后,拉伸强度、杨氏模量、邵氏硬度分别增加至添加前空白PDMS弹性体的4.50倍、1.97倍、2.17倍.燃烧实验表明:添加5份的十溴联苯醚和5份的氢氧化铝,蛭石/硅橡胶弹性体的阻燃性能可达到FV-0级,极限氧指数可达69.5%.Expanded vermiculite（ EV） doped poly（ dimethylsiloxane）（ PDMS）（ EV-PDMS） was prepared through two steps of condensation reactions,in which hydroxyl terminated poly（ dimethylsiloxane） was as main part,high temperature EV was as additive,and tetraethoxy-silicane（ TEOS） was as coupling agent. And the flame reatardant performance of EV-PDMS was studied. Detections of attenuated total reflectance infrared spectrum（ ATR-IR）,water contact angle,and scanning electron microscope（ SEM） revealed that,EV flakes homogeneously dispersed into PDMS,and crosslinked with PDMS through Si—O—Si covalent bonds; the resultant EV-PDMS elastomer maintained a highly hydrophobic surface. Mechanical properties revealed that,after addition of 60 copies EV,tensile strengths,Young＇s moduli,and Shao＇s hardness respectively increase to 4. 50,1. 97 and 2. 17. Combustion tests revealed that,after addition of 5 copies of decabromodiphenyl oxide（ De DBE） and 5 copies of aluminum hydroxide,flame retardant properties of EV-PDMS reached to FV-0 class,and their limited oxygen indexes（ LOI） reached to 69. 5%.

关 键 词：膨胀蛭石 羟基封端硅橡胶 缩合反应 阻燃性能 

分 类 号：TS08[轻工技术与工程]