摘要
为改善纳米CaCO_(3)与有机基体的相容性及分散性,增强苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)和纳米CaCO_(3)在改性沥青中的应用,对纳米CaCO_(3)进行氨基化改性制备了CaCO_(3)-NH_(2),对SBS进行环氧化处理制备了ESBS;然后,将CaCO_(3)-NH_(2)与ESBS进行共价接枝,制备了有机-无机杂化交联结构的SBS接枝纳米CaCO_(3)(SBS-g-CaCO_(3))。以接枝率、接触角和溶胀指数为关键指标,采用正交实验优化了SBS-g-CaCO_(3)的制备条件。通过FTIR、XPS、SEM、TGA、荧光显微镜对SBS-g-CaCO_(3)进行了表征和测试。将SBS-g-CaCO_(3)用于改性沥青,对其性能进行了测试。结果表明,得到的最优反应条件为n(环氧基)∶n(氨基)=1∶1、反应温度70℃、反应时间210 min、NaOH(浓度0.25 mol/L)水溶液掺量1 mL,其中,n(环氧基)∶n(氨基)对关键指标的影响最大。与ESBS相比,SBS-g-CaCO_(3)具有更好的热稳定性,接枝率最高可达49.5%。纳米CaCO_(3)颗粒在SBS中呈均匀分散状态并与SBS形成交联互穿网状结构;SBS-g-CaCO_(3)改性沥青的存储稳定性明显提升,48 h软化点差为0.5℃。
In order to improve the compatibility and dispersion of nano-CaCO_(3)with organic matrix,and promote the application of styrene-butadiene-styrene block copolymer(SBS)and nano-CaCO_(3)in modified asphalt,CaCO_(3)-NH_(2)was prepared from amination of nano-CaCO_(3),while ESBS was obtained from epoxidation of SBS.SBS grafted nano-CaCO_(3)(SBS-g-CaCO_(3))with organic-inorganic hybrid cross-linked structure was then synthesized from covalent grafting between CaCO_(3)-NH_(2)and ESBS.With grafting ratio,contact angle and swelling index as key indicators,the preparation conditions of SBS-g-CaCO_(3)were optimized by orthogonal experiments.The SBS-g-CaCO_(3)obtained were characterized by FTIR,XPS,SEM,TGA as well as fluorescence microscopy,and used in modified asphalt,with its property analyzed.The results showed that the optimal reaction conditions were obtained as follows:n(epoxy)∶n(amino)=1∶1,reaction temperature 70℃,reaction time 210 min,and NaOH aqueous solution(0.25 mol/L)doping dosage 1 mL,among which n(epoxy)∶n(amino)had the greatest influence on the key indexes.Compared with ESBS,SBS-g-CaCO_(3)exhibited better thermal stability,with the grafting rate reaching up to 49.5%.Nano-CaCO_(3)particles were uniformly dispersed in SBS and formed cross-linked interpenetrating network structure with SBS.The storage stability of SBS-g-CaCO_(3)modified asphalt was significantly improved,with the softening point difference at 48 h of 0.5℃.
作者
甘旺
初国斌
孙华东
康杰分
庞来学
丁永玲
GAN Wang;CHU Guobin;SUN Huadong;KANG Jiefen;PANG Laixue;DING Yongling(School of Communications and Civil Engineering,Shandong Jiaotong University,Jinan 250357,Shandong,China;Yantai Urban Drainage Service Center,Yantai 264000,Shandong,China;China National Building Materials Suzhou Waterproofing Research Institute Co.,Ltd.,Suzhou 215004,Jiangsu,China)
出处
《精细化工》
北大核心
2025年第9期1976-1985,共10页
Fine Chemicals
基金
山东省高等学校“青创科技支持计划”项目(2021KJO84)
山东省交通科技发展计划项目(2023B89,2022B101)
山东省科技型中小企业创新能力提升工程项目(2022TSGC2056)。
关键词
纳米碳酸钙
SBS嵌段共聚物
功能化
接枝
改性沥青
功能材料
nano calcium carbonate
SBS block copolymers
functionalization
grafting
modified asphalt
functional materials
