摘 要：聚偏氟乙烯膜具有化学稳定性好、机械强度高、耐腐蚀等优点，被广泛应用于化工生产和生活的各种领域。但由于聚偏氟乙烯是疏水性材料，其分离性能相对较差。因而对PVDF膜进行亲水化改性，制备分离性能优越的PVDF超滤膜具有重要意义。本文以氨基硅烷偶联剂（KH-602）为改性剂，运用相转化法分别制备了不同改性剂含量的 KH-602-ATP/PVDF混合基质超滤膜。通过拉伸力测试、接触角测定、纯水通量和牛血清蛋白（BSA）截留率等方法表征了改性膜的性质。结果表明：随着改性剂含量的增加，膜的纯水通量和膜孔径增大，亲水性提高。但截留率、吸附量和机械强度均有所下降。当改性剂含量为4 wt。%时，膜的纯水通量为238 L/m2•h，吸附量为252。5 ug/cm2，膜的抗污染性能最好，分离性能最佳。75912

毕业论文关键词：KH-602，相转化法，超滤膜，亲水化改进，分离性能

Abstract：Polyvinylidene fluoride (PVDF) membrane has good chemical stability, high mechanical strength and corrosion resistance, which is widely used in various fields of chemical production and life。 However, PVDF is a hydrophobic material and its separation performance is relatively poor。 Therefore, hydrophilic modification is of vital importance in preparation of PVDF ultrafiltration membrane with superior separation performance。 In this paper, the different amount of amino silane coupling agent (KH - 602) modified PVDF membrane were prepared by phase inversion method。 The membranes were then characterized using tensile stress tests, contact angle technique, water flux and bovine serum albumin (BSA) retention to investigate the influence on the final properties of the developed membrane。 The results show that with the increase of amount of modifier, the water flux, pore size and membrane hydrophilicity was developed。 However, BSA retention rate, adsorption and mechanical strength decreased。 When the modifier amount was 4 wt。%, the water flux of the membrane was 238 L/m2·h and the adsorption was 252。5 ug/cm2。 Meanwhile, the PVDF membrane anti-fouling property and separation performance were best。

Keywords：KH-602, phase inversion, ultrafiltration membrane, hydrophilic modification, separation performance

目   录

1  前言 3

1。1  膜分离 3

1。2  PVDF膜 4

1。3  相转化法 4

1。4  硅烷偶联剂KH-602改性凹土 5

1。5  本文的研究目的 6

2  实验部分 6

2。1  实验原料和仪器 6

2。2  实验方法 8

3  结果与讨论 12

3。1  机械强度 12

3。2  膜的渗透性能及孔径 12

3。3  静态吸附 14

3。4  膜的分离性能 15

结  论 17

参 考 文 献 18

致  谢 20

1  前言

1。1  膜分离

1。1。1  膜分离技术

膜分离技术通过半透膜进行选择性分离，其分离原理是依据物质分子尺度的大小，借助膜的选择渗透作用，在外界能量或化学位差的推动作用下对混合物中双组分或多组分溶质和溶剂进行分离、分级提纯和富集，从而达到分离、提纯和浓缩的目的[1]。