【作者】 黄二梅；

【导师】 杨卓如；

【作者基本信息】 华南理工大学 ， 化学工程， 2010， 硕士

【摘要】 油液中水的存在会严重影响油液品质,从而降低发动机的效率和使用寿命,给现代生产生活带来许多的危害和损失,因此控制油液中的含水量显得尤为必要。目前市场上,油水分离设备中的分离滤网一般是喷涂聚四氟乙烯粉末涂料实现疏水亲油性能,但其存在成膜温度高、亲油性不佳等缺点。因此开发新的油水分离材料显得极为重要。本文首先采用自由基溶液聚合法,以甲基丙烯酸十八烷基酯和苯乙烯等单体为亲油单体,氟单体为疏水单体,甲基丙烯酸-β-羟乙酯为羟基单体制备了热固性含氟丙烯酸酯树脂。研究了氟单体的种类、含量、添加方式对树脂各项性能的影响,并分析了苯乙烯(St)/甲基丙烯酸十八酯(SMA)/甲基丙烯酸十二氟庚酯(DFMA)的单体配比以及羟基单体用量等因素对树脂涂膜性能的影响。将树脂稀释至合适浓度浸渍不锈钢滤网,于120°C固化成膜后,可得到疏水亲油效果的过滤网,其水接触角为132.4°、煤油接触角为0°。其次,通过表面构造微观结构增大粗糙度,进一步提高树脂浸渍过滤网的疏水亲油性能,采用物理共混的方法,制备了纳米二氧化硅/含氟丙烯酸复合涂层。考察了纳米二氧化硅粒子的添加量和复合树脂的浓度对浸渍滤网疏水亲油性的影响。结果表明,当纳米二氧化硅粒子添加量为20wt%,涂层溶液浓度达到10wt%时,不锈钢网浸渍复合涂层溶液固化后可得到超疏水超亲油过滤网。最后,根据滤网油水分离的作用机理,设计简单的油水分离装置,研究了复合树脂在油水分离过滤网上的应用。结果表明:油水分离过程中,疏水性的提高对提高水的分离效率更为重要;本文制备的疏水亲油树脂可以适用于50目-1800目范围孔径内的不锈钢网;浸渍树脂的不锈钢网也适用于多种油液混合物中污染水的分离。更多还原

【Abstract】 The existence of water in oil can seriously reduce the quality of oil, so the efficiency andthe service life of the engine were reduced, which causes enormous damage and loss toindustrial production and modern living. Therefore, it is particularly necessaryal to reduce thecontent of water in oil. Generally, the hydrophobic-oleophilic properties of oil-waterseparation filter is endowed by spraying PTFE powder on the filter media. However, there arestill some defects such as high film-forming temperature and poor oleophilicity. Therefore,developing a facile and inexpensive approach to obtain an oil-water separation media iscrucial.Firstly, with methyl octadecyl acrylate and styrene as oleophilic monomer, fluorinatedmonomer as hydrophobic monomer, 2-hydroxyethyl methacrylate as hydroxy monomers, athermosetting fluorine-containing acrylic resin was prepared by free radical solutionpolymerization. Effect of the types, content and the way of addition of the fluorinatedmonomer on the properties of resin was studied. Besides, the ratio of the St/SMA/DFMA andthe amount of hydroxyl monomers were optimized for the performance of the resin. Stainlesssteel mesh was impregnated into the preparaed resin with the appropriate concentration. Aftercuring at 120℃, the oleophilic and hydrophobic filter was obtained. The contact angle ofwater and contact angle of kerosene were 132.4°and 0°, respectively.Secondly, to enhance the hydrophobic and oleophilic properties of the resin coated mesh,a micro-structure on the surface of the mesh was fabricated by blending nano-SiO2 particleinto the prepared fluorinated acrylate resin. Effects of nano-SiO2 content and concentration ofcomposite resin on the hydrophobic and oleophilic properties of stainless mesh wereinvestigated. The results show that a superhydrophobic and superoleophilic filter can beobtained when the nano-SiO2 particle content was 20wt% and the concentration of thesolution was 10wt%.Finally, base on oil-water separation mechanism, a simple oil-water separation devicewas designed. Application of the prepared composite resin on stainless mesh as oil-waterseparation filter was studied. The results show that improving the hydrophobicity of filter ismore important for high water separation efficiency in the process of oil-water separation.The prepared hydrophobic and oleophilic resin can be applied to stainless steel mesh with theaperture in the range of 50 to 1800 mesh. The resin coated stainless steel mesh can also beused for water separation in a varietyof oil-water mixture.更多还原