羟基和酯基型Gemini双季铵盐表面活性剂在煤沥青表面的润湿特性

Wettability on coal tar asphalt surface of dual quaternary ammonium salt Gemini surfactants containing ester and hydroxyl groups

以自制的羟基和酯基型Gemini双季铵盐表面活性剂为研究对象,在考察其表面活性的基础上,进一步研究了表面活性剂在煤沥青表面的润湿性。研究表明,羟基型Gemini表面活性剂在煤沥青表面的接触角随疏水链长度的增长呈先减小后增大趋势,其中C_(12)-OH在煤沥青表面的润湿效果最好;对于m-n-m酯基型Gemini表面活性剂而言,接触角随疏水链长度的增长而降低。当疏水链长度一定时,m-6-m在煤沥青表面的润湿效果比m-2-m好。在一定浓度范围内,C_(10)-OH、C_(12)-OH和12-2-12 3种Gemini表面活性剂的表面张力与其在煤沥青表面黏附张力呈线性关系。煤沥青表面的Zeta电位随Gemini表面活性剂浓度的增大呈先增大后趋于平稳的趋势。

Gemini surfactants of dual quaternary ammonium salts with hydroxyl and ester functional groups were synthesized and used to investigate wettability on coal tar asphalt surface. The contact angle of hydroxyl Gemini surfactants on coal tar asphalt surface decreased first and increased later with increase of hydrophobic chain length, which C（12）-OH surfactant showed best wetting. The contact angle of m-n-m ester Gemini surfactants decreased with increase of hydrophobic chain length. At fixed hydrophobic chain length, m-6-m surfactant had better wetting than m-2-m surfactant. A linear relationship was observed between adhesive tension on coal tar asphalt surface and surface tension of C（10）-OH, C（12）-OH and 12-2-12 surfactants within a range of concentrations. Zeta potential on the coal tar asphalt surface increased initially and tended to stabilize gradually along with increase of surfactant concentration.