Synthesis, Characterization And Application Of Functional Polysiloxane Finishing Agent

Amino-polysiloxane is widely used as softener in textile industry. It canendow very good softness, smoothness and fluffy handle to the fabrictreated by amino-polysiloxane. Due to the strong hydrophobic natureand the reason that treated fabric easily becoming yellow when heated,the application range of amino-polysiloxane is limited. The polyethermodified amino-polysiloxane can make up for the deficiency ofamino-polysiloxane, and it endows the treated fabric with ideal softness,hygroscopicity and antistatic properties. But with the increase of themolecular weight, the hydrophilicity will change for worse. Therefore,the research of organosilicon quaternary ammonium salt is vital toindustry.It can improve the water-absorbing of fabric, but also enhancethe attraction between finishing agent and negatively charged fabric.The polysiloxane with benzophenone derivative groups in sidechains is a kind of important functional finishing agent. The fabrictreated by it, can become soft, smooth, elastic and fluffy. Besides, it canimprove UV-absorbing performance of the fabric.Based on this, quaternary ammonium salt polyether-aminosiloxane(QPEAS) and carboxyl modified polyether organosilicon UV absorber(CPE-MUVS) were synthesized. The chemical structures andapplication performances were also researched. The detailed researchesare shown as follows:(1) Quaternary ammonium salt polyether-aminosiloxane (QPEAS)was synthesized by polyether-aminosiloxane (PEAS) and epoxypolyether (EPE). The polyether-aminosiloxane (PEAS) was synthesizedfrom ring-opening reaction of N-β-aminoethyl-γ-aminopropyl polydimethyl siloxane (ASO) and epoxy polyether with presence ofsmall molecule alcohol as solvent. The chemical structure of productwas characterized by infrared spectrum (IR) and proton nuclearmagnetic resonance (1H-NMR).The synthesis conditions of QPEAS are discussed,the physical andchemical properties of product are tested. Then, QPEAS was emulsifiedto obtain a transparent emulsion which had the solid content of30%. Itwas found that the viscosity, the average diameter and the Zeta potentialof the emulsion were2.5mPa s,42.0nm and+54.76mV. The applicationstudy was carried out with cotton fabric. The results indicated that theproduct QPEAS could obviously decrease the bending stiffness,improve the water-absorbing of fabric (the wettability was only1.52s)and had no influence on the whiteness of fabric.(2) A kind of carboxyl modified polyether organosilicon UVabsorber (CPE-MUVS) was synthesized by esterification betweenpolysiloxane (PE-PUVSi) and maleic anhydride. The intermediateproduc (PE-PUVSi) was a polysiloxane that with polyether andbenzophenone derivative groups in side chains. PE-PUVSi wassynthesized by hydrosilylation between PHMS, allyl polyether F-6and4-(3-allyloxy-2-hydroxy) propoxy-2-hydroxybenzophenone (MUV-0).The chemical structure of CPE-MUVS was characterized by IR,1H-NMR and Ultraviolet spectrum. Then, in the presence of compoundemulsifier, CPE-MUVS was emulsified to obtain a stable anionorganosilicon emulsion. The average diameter and the Zeta potential ofthe emulsion were30.44nm and-41.24mV. The compound emulsion wasgot from CPE-MUVS emulsion and ASO emulsion. The applicationstudy of ASO/CPE-MUVS was carried out with cotton fabric. Theresults indicated that ASO/CPE-MUVS could obviously improve theUV-absorbing perfor mance, softness and water-absorbing of the fabric.(3) The film morphology and surface structure of QPEAS andCPE-MUVS were studied and characterized by SEM and ATR-FTIR.The researches showed that, surface of the cotton fabric fibers wascovered by smooth organosilicon film.