硅氧烷改性水性聚氨酯滲透汽化膜的制備
發(fā)布時間：2018-09-10 11:43
【摘要】：采用水性聚氨酯為膜基材,以低聚物多元醇作為軟段,IPDI/TDI為硬段,乙二胺為擴鏈劑,合成WPU乳液；然后γ-環(huán)氧丙氧基丙基三甲氧基硅烷和γ—氨丙基三乙氧基硅烷作為有機硅改性劑,對WPU膜進行改性,以苯／環(huán)己烷體系分離為研究對象,研究膜結(jié)構(gòu)對苯/環(huán)己烷溶液滲透汽化分離性能的影響。(1)聚酯型WPU滲透汽化分離苯/環(huán)己烷的性能優(yōu)于聚醚型WPU,但滲透效果較差。TDI硬段WPU膜的分離效果優(yōu)于IPDI硬段WPU膜。采用聚己二酸1,4-丁二醇酯二醇(PBA)為軟段,異佛爾酮二異氰酸酯(IPDI)、甲苯二異氰酸酯(TDI)為硬段,合成WPU膜。研究發(fā)現(xiàn)：芳香族WPU膜滲透汽化分離苯/環(huán)己烷性能優(yōu)于脂肪族WPU膜,但滲透性能略差。PBA軟段合成的WPU膜分離和滲透效果均較理想；PBA基WPU膜軟段分子量越大,分離因子越小,滲透通量越大；軟段PBA-2000含量從51.6%增加到65.1%,IPDI硬段膜的分離因子由4.91減小到4.64,滲透通量由0.28kg.m-2.h-1增加到0.45 kg.m-2.h-1;TDI硬段膜的分離因子由6.11減小到5.33,滲透通量由0.095 kg.m2.h-1增加到0.42kg.m-2.h-1。(2)以PBA-2000,IPDI/TDI,乙二胺等為主要原料合成WPU乳液,并使用γ-環(huán)氧丙氧基丙基三甲氧基硅烷(KH-560)作為有機硅改性劑,制備一系列KH-560改性聚氨酯膜。KH-560改性膜的熱穩(wěn)定性顯著提高,改性PU膜對于苯/環(huán)己烷有一定滲透汽化分離作用,隨KH-560:-COOH比值增加,IPDI硬段的WPU膜分離因子由4.81增加到8.72,滲透通量由0.33 kg.m-2.h-1下降到到0.003 kg.m-2.h-1。硬段為TDI的WPU膜的分離因子由5.53上升到6.75,滲透通量由0.24 kg.m-2.h-1減少到0.031 kg.m-2.h-1。當KH-560:-COOH達到6及以上時,膜在苯/環(huán)己烷溶液中極易破裂,不能用于滲透汽化操作。(3)以PBA-2000,TDI等為主要原料合成WPU乳液,以Y—氨丙基三乙氧基硅烷(KH-550)作為有機硅改性劑,研究了硅烷KH-550添加量對PU膜滲透汽化分離苯/環(huán)己烷性能的影響。隨著KH-550代替更多的乙二胺,膜分離性能呈現(xiàn)先增大后減小、滲透通量呈現(xiàn)逐漸下降的趨勢。
[Abstract]:WPU emulsion was synthesized by using waterborne polyurethane as film substrate, oligomer polyol as soft segment IPDI as hard segment and ethylenediamine as chain extender. Then 緯-epichloropropyl trimethoxy silane and 緯-aminopropyl triethoxy silane were used as modifiers to modify the WPU membrane. The separation of benzene and cyclohexane was studied. The effect of membrane structure on the pervaporation separation performance of benzene / cyclohexane solution was studied. (1) Polyester WPU pervaporation was superior to polyether type WPU, in the separation of benzene and cyclohexane. The polyadipic acid 1-butanediol diol (PBA) was used as soft segment and isophorone diisocyanate (IPDI),) toluene diisocyanate (TDI) was used as hard segment to synthesize WPU film. It was found that the pervaporation of benzene / cyclohexane by aromatic WPU membrane was superior to that of aliphatic WPU membrane, but the separation and osmotic effect of WPU membrane synthesized by soft segment synthesis of aromatic WPU membrane was higher than that of the ideal WPU membrane, and the separation factor was smaller. The larger the permeation flux is; The content of PBA-2000 in soft segment increased from 51.6% to 65.1%, the separation factor decreased from 4.91 to 4.64, the permeation flux increased from 0.28kg.m-2.h-1 to 0.45 kg.m-2.h-1;TDI from 6.11 to 5.33, and the osmotic flux increased from 0.095 kg.m2.h-1 to 0.42kg.m-2.h-1.The main factor was PBA-2000,IPDI/TDI, ethylenediamine. Synthesis of WPU Emulsion from Raw material, Using 緯 -epichloropropyl trimethoxysilane (KH-560) as the modifier of organosilicon, the thermal stability of a series of KH-560 modified polyurethane membranes, KH-560, was improved significantly. The modified PU membrane had a certain permeation and vaporization separation effect on benzene / cyclohexane. With the increase of KH-560:-COOH ratio, the WPU membrane separation factor increased from 4.81 to 8.72, and the osmotic flux decreased from 0.33 kg.m-2.h-1 to 0.003 kg.m-2.h-1.. The separation factor of WPU membrane with hard TDI increased from 5.53 to 6.75, and the osmotic flux decreased from 0.24 kg.m-2.h-1 to 0.031 kg.m-2.h-1.. When KH-560:-COOH reaches 6 or more, the membrane is easily broken down in benzene / cyclohexane solution and cannot be used for pervaporation operation. (3) WPU emulsion is synthesized from PBA-2000,TDI and WPU emulsion is synthesized with Y- aminopropyl triethoxysilane (KH-550) as silicone modifier. The effect of silane KH-550 addition on the properties of benzene / cyclohexane separation by pervaporation of PU membrane was studied. With the substitution of KH-550 for more ethylenediamine, the separation performance of the membrane increased first and then decreased, and the permeation flux decreased gradually.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ051.893
本文編號：2234338
[Abstract]:WPU emulsion was synthesized by using waterborne polyurethane as film substrate, oligomer polyol as soft segment IPDI as hard segment and ethylenediamine as chain extender. Then 緯-epichloropropyl trimethoxy silane and 緯-aminopropyl triethoxy silane were used as modifiers to modify the WPU membrane. The separation of benzene and cyclohexane was studied. The effect of membrane structure on the pervaporation separation performance of benzene / cyclohexane solution was studied. (1) Polyester WPU pervaporation was superior to polyether type WPU, in the separation of benzene and cyclohexane. The polyadipic acid 1-butanediol diol (PBA) was used as soft segment and isophorone diisocyanate (IPDI),) toluene diisocyanate (TDI) was used as hard segment to synthesize WPU film. It was found that the pervaporation of benzene / cyclohexane by aromatic WPU membrane was superior to that of aliphatic WPU membrane, but the separation and osmotic effect of WPU membrane synthesized by soft segment synthesis of aromatic WPU membrane was higher than that of the ideal WPU membrane, and the separation factor was smaller. The larger the permeation flux is; The content of PBA-2000 in soft segment increased from 51.6% to 65.1%, the separation factor decreased from 4.91 to 4.64, the permeation flux increased from 0.28kg.m-2.h-1 to 0.45 kg.m-2.h-1;TDI from 6.11 to 5.33, and the osmotic flux increased from 0.095 kg.m2.h-1 to 0.42kg.m-2.h-1.The main factor was PBA-2000,IPDI/TDI, ethylenediamine. Synthesis of WPU Emulsion from Raw material, Using 緯 -epichloropropyl trimethoxysilane (KH-560) as the modifier of organosilicon, the thermal stability of a series of KH-560 modified polyurethane membranes, KH-560, was improved significantly. The modified PU membrane had a certain permeation and vaporization separation effect on benzene / cyclohexane. With the increase of KH-560:-COOH ratio, the WPU membrane separation factor increased from 4.81 to 8.72, and the osmotic flux decreased from 0.33 kg.m-2.h-1 to 0.003 kg.m-2.h-1.. The separation factor of WPU membrane with hard TDI increased from 5.53 to 6.75, and the osmotic flux decreased from 0.24 kg.m-2.h-1 to 0.031 kg.m-2.h-1.. When KH-560:-COOH reaches 6 or more, the membrane is easily broken down in benzene / cyclohexane solution and cannot be used for pervaporation operation. (3) WPU emulsion is synthesized from PBA-2000,TDI and WPU emulsion is synthesized with Y- aminopropyl triethoxysilane (KH-550) as silicone modifier. The effect of silane KH-550 addition on the properties of benzene / cyclohexane separation by pervaporation of PU membrane was studied. With the substitution of KH-550 for more ethylenediamine, the separation performance of the membrane increased first and then decreased, and the permeation flux decreased gradually.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ051.893
【參考文獻】
相關(guān)期刊論文 前4條
1 葉宏;李繼定;林陽政;陳劍;陳翠仙;;PEA型聚氨酯膜的制備及滲透汽化苯/環(huán)己烷的分離性能[J];高分子材料科學與工程;2009年03期
2 于紅梅;邱廣明;田瑞;郝慧博;;聚丙烯腈/聚氨酯共混超濾膜的制備[J];環(huán)境工程;2010年S1期
3 劉芳;馮東;賈德民;;γ-環(huán)氧丙氧基丙基三甲氧基硅烷改性聚氨酯乳液的制備與性能研究[J];彈性體;2005年06期
4 卿寧,王佛松;水性聚氨酯改性的研究[J];中國涂料;2003年03期
，本文編號：2234338
本文鏈接：http://sikaile.net/kejilunwen/huaxuehuagong/2234338.html
最近更新
教材專著
