聚氰胺及其衍生物改性聚氨酯的制备与研究-化学工程专业毕业论文

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1、AbstractAbstractAsthestatebegantolimitVOCemissions，thewaterbomepolyurethanebegantousherinanewdevelopmentopportunities．Waterbornepolyurethanehasmanyadvantages，suchas，nopollution，excellentmechanicalproperties，safety，easymodificationandgoodbiocompatibility，etc．However，waterresistanceandpoorheatresi

2、stanceofthetraditionalwaterbornepolyurethaneisnotisnotsatisfactory，mechanicalstrengthshouldbeimproved，whichpartlylimitedapplicationandpromotionofthewaterbornepolyurethane，modifiedWPUmaterialsiswidelystudied．Commonmethodsofmodifiedpolyurethanearephysicalblendinggrafting，nanomaterialsmodificationo

3、rcrosslinkingmodification．Melamineisatrimerofcyanamide，、ⅣitIlconjugatedtriazinering，isstabilityatroomtemperature，诵thexcellentheatresistance，willreleasealotofnitrogenwhentheresinismadebyitsthermaldecomposition，whichCanbeusedasaflameretardant．Melaminehasauniquestabletriazineringstructureandthreeal

4、lelicprimaryaminogroup．、析tllconsiderableactivitywhichCanbereactedwithisocyanatesanddirectlyintroducedintothepolyurethanechain．IsocyanateCanreactivewitllhydroxymethylwhichisthereactionproductofmelamineandformaldehyde，whilehighetherifiedmelamineformaldehyderesinasacrosslinkingagentwidelyusedinwate

5、r—basedpaint，whichCancross—linkingreactwiththeanionicpolyurethane，inordertoachievethepurposeofmodifiedcross-linkingpolyurethane，thispapermodifiedpolyurethanefollowingthreeparts：(1)Preparationandcharacterizationofmodifiedmelaminecrosslinkingwaterbornepolyurethane．Melamineasacrosslinkingagenttomod

6、ifyWPU、析tlltwomethodsmelaminemodifiedpolyurethaneandurethane-modifiedreardiffuser，comparedWPU诵mthesamedegreeofcross—linkedbyTMP，theresultsshowthatATRfoundmelaminecrosslinkingmodifiedWPU、丽thexpansionreactionisnotcomplete；residualmelaminedidnotparticipateinthereaction．Melaminedirectlycrosslinkedmo

7、difiedWPUfilms’tensilestrengthincreasedfrom6．8MPato13．45MPa,brokenelongationofflimadecreasedfrom1069％to643％．Threemethodsmodifiedfilms’tensileIII万方数据三聚氰胺及其延伸物改性水性聚氨酯的制备与研究strengthvariationisthatmelaminecross—linkedmodifiedWPU