Ugi反应海藻酸衍生物协同疏水改性高岭土稳定Pickering乳液的制备

doi:10.13218/j.cnki.csdc.2015.04.002

摘要/Abstract

摘要： 通过Ugi反应疏水改性海藻酸钠(Alg),制备了两亲性的海藻酸衍生物(Ugi-Alg)。以聚甲基氢硅氧烷(PMHS)作为疏水改性剂,利用干法球磨对高岭土(KL)微粒表面疏水改性。并利用FTIR、¹HNMR、接触角测量仪、激光粒度和Zeta电位分析仪对改性产物进行表征。用改性后的高岭土(MKL)协同Ugi-Alg制备稳定的Pickering乳液,并探究了水相pH对Pickering乳液形貌和液滴大小的影响。结果表明:Alg通过Ugi反应成功地疏水改性;PMHS在球磨的机械作用下吸附在KL微粒表面,使MKL成为具有高疏水性能的活性微粒;Ugi-Alg在超声作用下协同吸附在MKL微粒表面,改变了MKL微粒表面的润湿性,可提高Pickering乳液的稳定性;随着水相pH的升高,MKL/Ugi-Alg稳定的Pickering乳液液滴粒径逐渐减小,当pH=10.32时,其液滴粒径达到7.4 μm。

关键词: Pickering乳液, Ugi反应, 海藻酸衍生物, 改性高岭土

Abstract: Amphiphilic alginate derivative (Ugi-Alg) was prepared via Ugi reaction of hydrophobically modified sodium alginate (Alg).The kaolin (KL) particle's surface was hydrophobically modified with dry ball milling method,using poly (methyl hydrosiloxane) (PMHS) as hydrophobic modifying agent.Then the properties of the modified products were characterized by FTIR,¹HNMR,contact angle measurement,laser particle size measurement and Zeta potential analyzer.The stable Pickering emulsions were prepared by the modified kaolin (MKL) in cooperation with Ugi-Alg and effects of pH of the water phase on the morphological characteristics and the emulsions' droplet size of the Pickering emulsions were investigated.Experimental results showed that the hydrophobic modification of Alg by Ugi reaction is successful.PMHS is adsorbed on the surface of KL under the mechanical action of the ball milling,making MKL become the active particle with high hydrophobic property.Ugi-Alg is coordinately adsorbed on the particle's surface of MKL under action of ultrasonic wave,changing the wettability of MKL particles' surface,which could effectively improve the stability of the Pickering emulsions.As the raising of pH of the water phase,droplet size of the MKL/Ugi-Alg Pickering emulsions is gradually declined.When the pH achieves 10.32,the emulsions' droplet size reaches 7.4 μm.

Key words: Pickering emulsions, Ugi reaction, alginate derivative, modified kaolin

中图分类号:

O648.2+3

陈秀琼, 颜慧琼, 李嘉诚, 冯玉红, 史载锋, 王向辉, 林强. Ugi反应海藻酸衍生物协同疏水改性高岭土稳定Pickering乳液的制备[J]. 日用化学工业, 2015, 45(4): 185-190.

CHEN Xiu-qiong, YAN Hui-qiong, LI Jia-cheng, FENG Yu-hong, SHI Zai-feng, WANG Xiang-hui, LIN Qiang. Preparation of stable Pickering emulsions by alginate derivative prepared via Ugi reaction in cooperation with hydrophobically modified kaolin[J]. China Surfactant Detergent & Cosmetics, 2015, 45(4): 185-190.

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