A study on modified methylnaphthalene sulfonate formaldehyde condensates: synthesis, structures and asphalt emulsification

摘要

The novel surfactants of sulfonated methylnaphthalene-formaldehyde condensates modified with poly(ethyleneglycol) monooctylphenyl ether (OP-10), 4-octylphenol or octadecylamine were synthesized as anionic emulsifier for the preparation of asphalt emulsions and cement mortar. The experimental results revealed that the modified methylnaphthalene sulfonate formaldehyde condensates (MSFC-OP10, MSFC-OCP and MSFC-OAM) containing a substantial amount of hydrophobic and lipophilic groups in the main chain would exhibit a superior effect both in dispersability and emulsifying property. When cement is mixed with the emulsified asphalt containing MSFC-OP10, MSFC-OCP or MSFC-OAM, the free as-synthesized condensates in the emulsified asphalt exhibited a fairly good dispersing performance and this emulsified asphalt appeared to be relatively stable as well. The presence of either MSFC-OP10, MSFC-OCP or MSFC-OAM in the asphalt emulsion would not only markedly improve its stability, delay its demulsification process, but also would upgrade and restrain both the settlement and stratification of the mixed mastics.