摘要
先使用碱性硅溶胶在聚磷酸铵(APP)表面形成一层无机自组装微胶囊化APP(SiO2@APP),再使用硅烷偶联剂3-巯丙基三乙氧基硅烷(KH 580)通过溶胶-凝胶法对SiO2@APP表面进行接枝改性制备了接枝改性APP(KH 580-SiO2@APP)阻燃剂,将其应用到天然橡胶(NR)中制备了NR复合材料,研究了APP表面改性对NR复合材料的疏水性、热稳定性、阻燃性能和物理机械性能的影响。结果表明,已成功对APP表面进行改性。相较于APP,经碱性硅溶胶改性后所得SiO2@APP的水接触角增加了205.7%,热稳定性提高了约25.7%;相较于APP/NR复合材料,SiO2@APP/NR复合材料的拉伸强度提高了43.7%,但是其极限氧指数(LOI)有所下降。SiO2@APP经硅烷偶联剂KH 580改性后,所得KH 580-SiO2@APP的水接触角增加了9.1%,热稳定性提高幅度将近11.6%。此外,KH 580-SiO2@APP/NR复合材料的拉伸强度得以提高,达到了16.2 MPa,扯断伸长率上升幅度达到了539%,而LOI略下降至24.3%。
First,a layer of inorganic self-assembled microencapsulated ammonium polyphosphate(APP)(SiO2@APP)was formed on the surface of APP using alkaline silica sol,and then grafting modified APP(KH 580-SiO2@APP)flame retardant was prepared via grafting modification of the silane coupling agent 3-mercaptopropyltriethoxysilane(KH 580)onto the surface of SiO2@APP by sol-gel method.Meanwhile,natural rubber(NR)composites were prepared by the application of KH 580-SiO2@APP to NR,and the effects of APP surface modification on the hydrophobicity,thermal stability,flame retardancy,and physical and mechanical properties of NR composite materials were studied.The results indicated that the surface modification of APP was successful.Compared with APP,the water contact angle of the resulting SiO2@APP increased by 205.7%and the thermal stability increased by about 25.7%after the modification with alkaline silica sol,and in the meantime,compared with APP/NR composite material,the tensile strength of SiO2@APP/NR composite increased by 43.7%,but the limited oxygen index(LOI)decreased.After the modification of SiO2@APP with the silane coupling agent KH 580,the water contact angle of the resul-ting KH 580-SiO2@APP increased by 9.1%and the increase in thermal stability was nearly 11.6%.In additon,the tensile strength of KH 580-SiO2@APP/NR composite was improved to 16.2 MPa,and the elongation at break increased by 539%,while the LOI decreased slightly to 24.3%.
作者
张政
梁玉蓉
王龙
高国玮
张涛
ZHANG Zheng;LIANG Yu-rong;WANG Long;GAO Guo-wei;ZHANG Tao(School of Materials Science and Engineering,North University of china,Taiyuan 030051,China;Department of Materials Engineering,Taiyuan Institute of Technology,Taiyuan 030008,China)
出处
《合成橡胶工业》
CAS
2024年第3期216-221,共6页
China Synthetic Rubber Industry
关键词
天然橡胶
聚磷酸铵
表面改性
溶胶-凝胶法
硅烷偶联剂
物理机械性能
阻燃性能
natural rubber
ammonium polyphosphate
surface modification
sol-gel method
silane coupling agent
physical and mechanical property
flame retardancy
