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1、碩士論文無(wú)機(jī)陶瓷微濾膜的制各與表征應(yīng)用Y."125561摘要本論文主要研究了制膜液穩(wěn)定分散的條件、浸漿法涂膜、固態(tài)粒子燒結(jié)法制備擔(dān)載陶瓷微濾膜的工藝方法,以氣體泡壓法測(cè)定膜的孔徑分布、SEM法測(cè)膜厚、干濕膜重量法測(cè)孔隙率,同時(shí)對(duì)膜的微觀結(jié)構(gòu)和分離性能進(jìn)行表征,得到了完整無(wú)缺陷、孔徑大小和膜厚等膜性能指標(biāo)可調(diào)控的陶瓷微濾膜。f實(shí)驗(yàn)結(jié)果表明,通過(guò)水力分級(jí)可以獲得各種粒徑分布的氧化鋁原料粉體,不同粒徑范圍的粉體可以制得不同孔徑范圍的微濾膜,實(shí)驗(yàn)中采用d50分別為O.76um、112lam和2.08um的
2、原料粉體,制得的膜的最可幾孔徑分別為O.441.tm、0.86tam和1.54btm;通過(guò)對(duì)懸浮液分散穩(wěn)定性的研究,得到了氧化鋁微濾膜制膜液的優(yōu)化配方為:d.氧化鋁粉(一定固含量)、水、PAA(0.2wt%-0.8wt%)、PVA(適量)、TiO!(適量)、pH=9;調(diào)節(jié)涂膜時(shí)間和制膜液固含量,可以在10um~50um之間對(duì)膜厚進(jìn)行有效的控制;調(diào)節(jié)膜厚,燒結(jié)溫度和原料粉體粒徑,可以實(shí)現(xiàn)膜孔徑大小和分布的調(diào)控:通過(guò)支撐體預(yù)涂,在O.2MPa的過(guò)濾壓力下,膜的純水通量由3.06m3/m2/h提高到6.
3、14m3/m?。徊捎玫驼扯?、低固含量、粉體更細(xì)的制膜液浸涂,對(duì)膜面進(jìn)I?-次修飾,m。、1Ⅳ修飾后的膜,膜厚僅增加了4.48um,而最大孔徑從修飾前的2.88um減小為O6ju,實(shí)驗(yàn)制得的微濾膜最可幾iL徑O.52um,膜厚25pm,孔隙率37.28%,02MPa下水通量為3.12m3/(m2·h),對(duì)酵母菌的截留率為99.9922%;制得的膜既可直接用于微濾,又是制備超濾膜的優(yōu)良載體。關(guān)鍵詞:氧化鋁,陶瓷微濾膜,固態(tài)粒子燒結(jié),氣體泡壓法,孔徑分布碩上論支無(wú)機(jī)陶瓷微濾膜的制各與表征應(yīng)用ABSTRA
4、CTInthisdissertation,thedispersionbehaviorofsuspensionsandthepreparationofaluminaceramicmicrofiltrationmembranebyslipcastingtechnique&solid—state-particlessinteringmethodwereinvestigated.Thestructureandseparationpropertieswerecharacterizedbygasbubblep
5、ressuremethod,SEM,EDS,anddry—wetmembraneweight—lossmethod.Free—detectmicrofiltrationmembranesofwhichmicrostructureandperformanceparameterscouldbecontrolledwereobtained.Theresultsshows:ThestabilityofceramicslurryWasstronglyinfluencedbytheconcentrationo
6、fdispersants,pHvalue,andaluminapowdersize.Throughthestudyofdispersingperforn3.a(chǎn)nceofmicrofine¨A1203withtheadditionofPAA,(NaP03)6,SCMC,theoptimizedcompositionofslurryforcastingWasobtainedas:microfineQ—A1203(propersolidcontent),water,PAA(O.2wt%--O.8wt%)
7、,PVA(propercontent),Ti02(propercontent),pH=9.Themembranethicknessincreasedlinearlywithsolidcontentinslurryandthesquarerootofthecastingtime.Thethicknessofthemembranecarlbeadjustedbetween10umand50umbychangingsolidcontentinslurryandcastingtime.Whileincre
8、asingthesinteringtemperature,themeanporesizesandtheporositiesdecreased,andtheporesizedistributionsbecamenarrower.SupportprecoatingbyPVAwatersolutionr0.4wt%~0.Swt%)couldincreasethepurewaterpermeabilityfrom3.06m3/m2/htO6.14m3/m2/h.Thedefectintop