首页|不同异氰酸酯含量聚氨酯预聚体改性沥青性能研究

不同异氰酸酯含量聚氨酯预聚体改性沥青性能研究

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

PolyurethaneIsocyanateRheological propertiesAsphalt mixture

杨潇、洪锦祥、熊子佳、徐正宏、程金梁、付传清

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浙江工业大学土木工程学院,浙江 杭州 310014

江苏苏博特新材料股份有限公司,江苏 南京 211103

东南大学交通学院,江苏 南京 210018

聚氨酯 异氰酸酯 流变性能 沥青混合料

2024

当代化工
中国石油抚顺石化公司,中国石化抚顺石油化工研究院,沈阳市医药和化工行业联合会

当代化工

CSTPCD
影响因子:0.412
ISSN:1671-0460
年,卷(期):2024.53(12)