幾種典型高效減水劑的合成與復合及作用機理研究.pdf

1、西南科技大學碩士學位論文幾種典型高效減水劑的合成與復合及作用機理研究姓名：任先艷申請學位級別：碩士專業(yè)：材料學指導教師：劉才林20090412西南科技大學碩士研究生學位論文第1I頁AbstraetInthispaper，severalkindsofimportantwaterreducerswerereviewedfortheirstructuresandmechanismsThesynthesesofpolycarboxylic，al

2、iphatic，andmelaminewaterreducerswithdifferentmolecularstructurewerestudiedPreparationofthreekindsofcompositewaterreducerswithoutlow—molecularweightretarderssuchasaliphaticpolycafboxylicseries，melamine—polycarboxylicserie

3、sandnaphthalenepolycarboxylicserieswerestudiedaswellCopolymerizationofacrylicacid(AA)，sodiummethallylsulfonate(SMAS)andmethoxypolyethyleneglycolmonoacrylate(PA)givespolycarboxylicwaterreducer(XKPC)comblikemolecularstruct

4、urewhichcontains“carboxylicgroupetherbond—sulphonicgroup”Theamountofinitiatoris25％(massratio)andmonomermolarratioisAA：SMAS：PA=385：1：1Aliphaticwaterreducer(XK—FAS)wassynthesizedfromformaldehyde(F)，acetone(A)，andsulfonatin

5、gagent(S)Theoptimumconditionisasfollows：sodiumbisulfiteiSusedassulfonatingagent，andmonomermolarratioisF：A：S=25：1：021；Melaminewaterreducer(XK—FMS)wassynthesizedfromformaldehyde(F)，melamine(M)，urea(U)，andsodiumbisulfite(S)

6、Thebestprocessparametersareasfollows：monomermolarratioiSF：(MU)：S=25：1：1，pHvalueiS1213，reactiontimeofreformstageis20min，anditsproductconcentrationiskeptat30％Inaddition，thesynthesizedXK—PC，XKFAS，andXKFMSwerecharacterizedby

7、infraredspectrumanalysisThreekindsofcompositewaterreducers(FASPC，FMSPC，andFDN—PC)wereobtainedwithoutlowmolecularweightretarderappended，throughcompoundingofpolycarboxylicwaterreducerwithaliphaticseries，melamineseries，andn

8、aphthaleneseriesrespectivelyThecontentsofcostlypolycarboxylicwaterreducerinthesecompositewaterreducersarelessthan17％，andespeciallyinnaphthalenepolycarboxyliccomposite，thecontentisjust1％Thisbrokentherulethatwater—reducing

9、propertydecreasedafterpolycarboxylicwaterreducercompoundwithnaphthalenesedes，orpolycarboxylicwaterreducerandnaphthaleneserieswaterreducerCaB’tbeusedtogetherata11Theapplicationperformancesofcementpaste，freshconcreteandhar