不同异氰酸酯含量聚氨酯预聚体改性沥青性能研究  

Study on Performance of Polyurethane Prepolymer Modified Asphalt with Different Isocyanate Content

作　　者：杨潇 洪锦祥 熊子佳 徐正宏 程金梁 付传清[1] YANG Xiao;HONG Jinxiang;XIONG Zijia;XU Zhenghong;CHENG Jinliang;FU Chuanqing(College of Civil Engineering,Zhejiang University of Technology,Hangzhou Zhejiang 310014,China;Jiangsu Subote New Materials Co.,Ltd.,Nanjing Jiangsu 211103,China;School of Transportation,Southeast University,Nanjing Jiangsu 210018,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310014 [2]江苏苏博特新材料股份有限公司,江苏南京211103 [3]东南大学交通学院,江苏南京210018

出　　处：《当代化工》2024年第12期2875-2881,共7页Contemporary Chemical Industry

基　　金：江苏省前沿引领技术基础研究重大项目(项目编号:BK20222004)。

摘　　要：采用4种聚氨酯(PU)预聚体和1种异氰酸酯单体对基质沥青进行改性。用甲苯/二正丁胺和盐酸标准滴定溶液法测定5个样品的异氰酸酯(—NCO)含量,并通过傅里叶变换红外光谱(FTIR)技术、荧光显微镜对PU预聚体改性沥青的机理、微观构造进行分析,通过动态剪切流变(DSR)试验,分析—NCO含量对PU改性沥青流变性能的影响。采用AC-13级配,对改性沥青的混合料进行高温车辙试验和低温小梁弯曲试验。结果表明:PU预聚体改性沥青存在化学改性现象,—NCO含量增加能改善改性沥青的高温流变性能以及体系的分散性。PU预聚体中—NCO含量过低则会使沥青混合料的高温性能变差,而—NCO含量过高也会增加混合料的脆性。Four kinds of polyurethane(PU)prepolymers and one kind of isocyanate monomer were used to modify the base asphalt.The isocyanate(—NCO)content of five samples was determined by toluene/di-n-butylamine and hydrochloric acid standard titration solution method.The mechanism and microstructure of PU prepolymer-modified asphalt were analyzed by Fourier transform infrared spectroscopy(FTIR)and fluorescence microscope.The effect of—NCO content on the rheological properties of PU-modified asphalt was analyzed by dynamic shear rheology(DSR)test.Using AC-13 gradation,the high-temperature rutting test and low-temperature trabecular bending test were carried out on the modified asphalt mixture.The results showed that PU prepolymer-modified asphalt had a chemical modification phenomenon and the increase of—NCO content could improve the high-temperature rheological properties of modified asphalt and the dispersion of the system.The low content of—NCO in PU prepolymer could make the high-temperature performance of the asphalt mixture worse,and the excessive content of—NCO could also increase the brittleness of the mixture.

关 键 词：聚氨酯 异氰酸酯 流变性能 沥青混合料 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业] TU535[建筑科学—建筑技术科学]