TIPS法制备iPP中空纤维膜工艺条件研究

发布时间：2018-05-25 15:44

  本文选题：TIPS + 绕丝机转速　； 参考：《天津大学》2010年硕士论文

【摘要】： 等规聚丙烯(iPP)具有强疏水性、常温下不溶于任何化学试剂、价格低廉等优点,是一种性能优良的制膜材料。本文采用TIPS法制备iPP中空纤维微孔膜,并对绕丝机转速、釜内压、喷丝头温度和注气量等工艺条件进行考察,旨在制备出渗透性能好、孔径可调、孔径分布窄、力学强度高的微孔膜。 本实验在喷丝头内部加入了分流锥,减小了流体在喷丝头内部的压缩比和入口角度,使流体流动趋于稳定;采用空气冷却代替液体凝固浴,降低降温速率,抑制外表面皮层的产生;使用氮气作为成腔流体,流程更加简单安全,流量易控。 研究中发现,绕丝机转动速度由2.53rpm增大至3.53rpm,膜丝外表面孔径尺寸增大,水通量及孔隙率均升高,最大值分别可达到1350L/(m2·h·bar)和0.72,膜丝的拉伸强度先增大再减小,在绕丝机转速为3.12rpm处达到峰值7.0Mpa;釜内压由0.075Mpa增至0.15Mpa的过程中,膜外表面孔径尺寸增大,水通量和孔隙率均增大,膜的拉伸强度由7.0Mpa增至9.0Mpa;喷丝头温度由145℃升高至150℃,膜外表面产生了致密的皮层结构,膜水通量由1789 L/(m2·h·bar)降至625 L/(m2·h·bar),而膜的拉伸强度则由4.1Mpa增大至5.7Mpa;注气量增大,膜的壁厚和内径减薄趋势明显。 结果表明,绕丝机转速、釜内压的增大对膜的孔径尺寸、水通量和孔隙率的提高有促进作用;而喷丝头温度的升高易使膜外表面产生致密皮层,膜孔径尺寸减小,使膜的水通量和孔隙率降低。
[Abstract]:Isotactic polypropylene (IPP) has the advantages of strong hydrophobicity, insoluble in any chemical reagent at room temperature, low price and so on. In this paper, iPP hollow fiber microporous membrane was prepared by TIPS method. The process conditions such as the speed of wire winding machine, the pressure inside the kettle, the temperature of the spinneret and the gas injection rate were investigated. The purpose of this study was to prepare the iPP hollow fiber microporous membrane with good permeability, adjustable pore diameter and narrow pore size distribution. Microporous film with high mechanical strength. In this experiment, the splitter cone is added to the inside of the spinneret, the compression ratio and inlet angle of the fluid in the spinneret are reduced, the flow of the fluid tends to stabilize, the air cooling is used instead of the liquid solidification bath, and the cooling rate is reduced. The formation of outer surface cortex is inhibited. Nitrogen gas is used as cavity fluid, the flow is simpler and safer, and the flow rate is easy to control. It was found that the rotation speed of the wire winding machine increased from 2.53rpm to 3.53 rpm, the pore size of the outer surface of the membrane increased, the water flux and porosity increased, and the maximum values reached 1350L/(m2 h bar. respectively. The tensile strength of the membrane increased first and then decreased. In the process of increasing the internal pressure from 0.075Mpa to 0.15Mpa, the pore size of the outer surface of the membrane increases, the water flux and porosity increase, the tensile strength of the membrane increases from 7.0Mpa to 9.0 MPA, and the spinneret temperature increases from 145 鈩，

本文编号：1933798