The invention relates to a preparation method of an anti pollution and high strength hollow fiber nanofiltration membrane. The technical proposal of the invention is to design a new type of spinning process (see Figure 1, figure 2), in the process of polyethersulfone (PES), sulfonated polyethersulfone (SPES) blends or both for bulk materials, non solvent electrostatic spinning technology and traditional spinning technology combined with phase transformation, when hollow fiber membrane casting solution from the spinneret plate extrusion, solution electrostatic spinning needle from the right into the hollow fiber membrane wall, the two together into the coagulation bath phase transformation, and after rinsing and winding process, get Beaded fiber or superfine fiber beam with functionalized hollow fiber nanofiltration membranes with strong gluten. Many beads or superfine fiber bundles consist of stiffeners, which are firmly embedded in hollow fiber nanofiltration membrane (see Figure 3 and Figure 4). It is difficult to peel off, reinforcing bars are high strength resin mixed inorganic particles, and endow hollow fiber nanofiltration membrane with higher strength and pollution resistance. The process of the invention is simple and advanced, and is suitable for the large-scale production of the hollow fiber membrane plant.
【技术实现步骤摘要】
一种中空纤维纳滤膜的制备方法
本专利技术涉及一种纳滤膜的制备方法,具体为一种以串珠纤维或超细纤维束为加强筋的中空纤维纳滤膜的制备方法,属于分离膜制造领域。
技术介绍
纳滤膜(Nanofiltration,NF)是截留性能介于超滤和反渗透之间的一种新型分离膜。纳滤膜对单价盐的截留率小于50%,对二价及多价盐的截留率均在80%以上;并可截留相对分子质量在200以上的溶解组分。另外,纳滤过程需要的跨膜压差一般为0.5~2.0MPa,比用反渗透达到同样的渗透通量所需施加的压差低0.5~3.0MPa。由于其选择截留特点和低压可操作性,纳滤技术开始在水资源、食品、医药、环保、化工等领域得到广泛应用。商品纳滤膜多为螺旋卷式膜组件,生产工艺复杂,使用条件苛刻,清洗和维护都较为困难。中空纤维膜具有单位体积内比表面积大,膜及组件生产工艺简单,易清洗易维护等优点。但均质中空纤维膜强度略低,在纳滤操作压力下易发生变形;目前有采用编织网和纤维做加强的中空纤维膜,但在使用过程中易发生加强网或加强纤维易与膜体剥离的现象,带来中空纤维膜结构损伤和性能恶化。
技术实现思路
针对现有技术的不足,本专利技 ...
【技术保护点】
本专利技术是一种串珠纤维或超细纤维束加强的中空纤维纳滤膜的制备方法,该加强型中空纤维膜是以聚醚砜(PES)和磺化聚醚砜(SPES)共混物为本体材料,以功能化的串珠纤维或纤维束为加强筋(加强纤维)。
【技术特征摘要】
1.本发明是一种串珠纤维或超细纤维束加强的中空纤维纳滤膜的制备方法,该加强型中空纤维膜是以聚醚砜(PES)和磺化聚醚砜(SPES)共混物为本体材料,以功能化的串珠纤维或纤维束为加强筋(加强纤维)。2.根据权利要求1,本发明是将静电纺技术与传统的非溶剂相转化纺丝工艺相结合,采用加强纤维与中空纤维膜同纺技术制备的。3.具体工艺包括:在传统湿法纺丝机上加装静电纺丝装置(见图1),静电纺的出料针头在喷丝板的出料口下方,未来中空纤维膜壁的中间;配制聚醚砜和磺化聚醚砜的铸膜液,静置脱泡;将无机粒子、助剂、聚合物等与溶剂配制成静电纺丝溶液;设定静电纺丝条件,包括:静电压、纺丝速度等,开启静电纺设备,采用空气纺和液流控制技术,纺制串珠纤维或纤维束(见图2);开启中空纤维纺丝机,在一定温度和压力下,使铸膜液通过喷丝板和和静电纺丝针尖,与静...
【专利技术属性】
技术研发人员:不公告发明人,
申请(专利权)人:上海健水源新材料科技有限公司,
类型:发明
国别省市:上海,31
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