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The Synthesis and Application of Novel Fluorine Containing Water-and Oil-Repellent

Author: XieQuanHuan
Tutor: QingFengZuo
School: Donghua University
Course: Organic Chemistry
Keywords: water-and oil-repellent octavinyl polyhedral oligomeric silsesquioxane(Ov-POSS) fluorinated methacrylate citric acid crease-resistant
CLC: TS195.2
Type: Master's thesis
Year: 2014
Downloads: 50
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Abstract


The research of textile finishing agents is becoming more and more perfected with the development and improvement of after-treatment process of cotton fabrics. Researches on multifunctional textile finishing agents, such as water-and oil-repellent agent and crease-resistant agent, have become the highlight in this field. Fluorine containing chemicals are widely used as textile finishing agents due to their unique properties, such as low surface tension, perfect chemical stability, high efficiency, favorable moisture absorption and air permeability, good hand feeling, etc. Although the water-and oil-repellent abilities of finishing agents containing short perfluoroalkyl chains (CnF2n+1, n≤6) are not as good as those of containing longer perfluoroalkyl chains (CnF2n+1, n≥8), the former are highly regarded due to the environmental concern. In this thesis, we are trying to improve the water-and oil-repellent abilities of finishing agents containing short perfluoroalkyl chains by molecular structure modification.Part Ⅰ:An acrylate monomer containing three perfluoroalkyl chains was synthesized starting from pentaerythritol via etherification, radical addition, reduction and esterification. It was then copolymerized in solution with octavinyl polyhedral oligomeric silsesquioxane (Ov-POSS) and methyl methacrylate (MMA) initiated by azodiisobutyronitrile (AIBN) to afford a novel Ov-POSS-based copolymer grafted with multi-perfluoroalkyl chains. The copolymers were characterized by NMR, FT-IR, elemental analysis, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), etc. The cotton fabrics coated with these copolymers possessed superhydrophobicity and good oil repellency. The water and salad oil contact angle of cotton fabrics treated with copolymer (mass containing of Ov-POSS as10%, mole ratio of MMA/fluorine containing monomer as4/1) could achieve156°and124°, respectively.Part Ⅱ:A multifunctional textile finishing agent containing perfluoroalkyl chain was synthesized starting from citric acid, alkyl bromide and perfluoro-1-iodohexane via etherification, radical addition, reduction and hydrolyzation and then used on cotton fabrics. The cotton fabrics coated with this agent possessed good crease-resistance, hydrophobicity and oil repellency after washing for5times. The creasy recovery angle could reach230°. water and salad oil contact angle was148°and138°, respectively. This agent could also separate oil from water. Besides, it can dissolve in water, so no organic solvent was needed during the finishing process of fabrics which meets the environmental demand.

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CLC: > Industrial Technology > Light industry,handicrafts > Textile industry,dyeing and finishing industry > Dyeing and finishing industry > Finishing > Finishing with agent
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