Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (2): 116-121.doi: 10.3969/j.issn.1000-565X.2017.02.016

• Materials Science & Technology • Previous Articles     Next Articles

Properties of Asphalt Modified with Montmorillonite After a Modification by Isophorone Diisocyanate

XIAO Xin-yan ZHANG Deng-ke   

  1. School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2016-05-25 Revised:2016-11-16 Online:2017-02-25 Published:2016-12-31
  • Contact: 肖新颜( 1964-) ，男，教授，博士生导师，从事有机无机纳米复合材料研究． E-mail:cexyxiao@scut.edu.cn
  • About author:肖新颜( 1964-) ，男，教授，博士生导师，从事有机无机纳米复合材料研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China( 21376099， 21546002) and the Joint Foundation of Petroleum Processing( U1162120)

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Abstract:

Acidified montmorillonite ( HMMT) was modified with isophorone diisocyanate ( IPDI) ,and the obtained IPDI-HMMT was used as a chemical modifier to modify asphalt via melt blending.Then,the physical properties,UV aging resistance and thermal stability of the modified asphalt were investigated.The results show that ( 1) IPDI-HMMT grafted with —NCO can react with the hydroxy in asphalt to produce urethane and to form an exfoliated structure; ( 2) after the incorporation of IPDI-HMMT,the initial decomposition temperature of the modified asphalt increases by 9℃,the softening point is up to 57.0℃,and the segregation softening point difference,the mass change rate,the softening point increment and the residual penetration ratio all change more slightly than those of Na-MMT modified asphalt; and ( 3) the chemical reaction between IPDI-HMMT and asphalt enhances the interaction of the internal components,which helps to form a stable colloidal structure,so that IPDI-HMMT has greater enhancement effect on the asphalt performance than Na-MMT.

Key words: isophorone diisocyanate, montmorillonite, asphalt, chemical modification, physical properties, UV aging resistance, thermal stability