本文選題：TIPS + 繞絲機(jī)轉(zhuǎn)速��； 參考：《天津大學(xué)》2010年碩士論文

【摘要】： 等規(guī)聚丙烯(iPP)具有強(qiáng)疏水性、常溫下不溶于任何化學(xué)試劑、價(jià)格低廉等優(yōu)點(diǎn),是一種性能優(yōu)良的制膜材料。本文采用TIPS法制備iPP中空纖維微孔膜,并對(duì)繞絲機(jī)轉(zhuǎn)速、釜內(nèi)壓、噴絲頭溫度和注氣量等工藝條件進(jìn)行考察,旨在制備出滲透性能好、孔徑可調(diào)、孔徑分布窄、力學(xué)強(qiáng)度高的微孔膜。 本實(shí)驗(yàn)在噴絲頭內(nèi)部加入了分流錐,減小了流體在噴絲頭內(nèi)部的壓縮比和入口角度,使流體流動(dòng)趨于穩(wěn)定;采用空氣冷卻代替液體凝固浴,降低降溫速率,抑制外表面皮層的產(chǎn)生;使用氮?dú)庾鳛槌汕涣黧w,流程更加簡(jiǎn)單安全,流量易控。 研究中發(fā)現(xiàn),繞絲機(jī)轉(zhuǎn)動(dòng)速度由2.53rpm增大至3.53rpm,膜絲外表面孔徑尺寸增大,水通量及孔隙率均升高,最大值分別可達(dá)到1350L/(m2·h·bar)和0.72,膜絲的拉伸強(qiáng)度先增大再減小,在繞絲機(jī)轉(zhuǎn)速為3.12rpm處達(dá)到峰值7.0Mpa;釜內(nèi)壓由0.075Mpa增至0.15Mpa的過(guò)程中,膜外表面孔徑尺寸增大,水通量和孔隙率均增大,膜的拉伸強(qiáng)度由7.0Mpa增至9.0Mpa;噴絲頭溫度由145℃升高至150℃,膜外表面產(chǎn)生了致密的皮層結(jié)構(gòu),膜水通量由1789 L/(m2·h·bar)降至625 L/(m2·h·bar),而膜的拉伸強(qiáng)度則由4.1Mpa增大至5.7Mpa;注氣量增大,膜的壁厚和內(nèi)徑減薄趨勢(shì)明顯。 結(jié)果表明,繞絲機(jī)轉(zhuǎn)速、釜內(nèi)壓的增大對(duì)膜的孔徑尺寸、水通量和孔隙率的提高有促進(jìn)作用;而噴絲頭溫度的升高易使膜外表面產(chǎn)生致密皮層,膜孔徑尺寸減小,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，

本文編號(hào)：1933798