英语科技论文写作结课论文

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1、英语科技论文写作结课论文ThePreparationandResearchOfEpoxyResinModifiedWater-bonePolyurethaneEmulsion1.IntroductionTherearevarioustypesofrawmaterialsforsyntheticwater-bonepolyurethaneemulsion,includingnotonlymainrawmaterialssuchasisocyanatesofpolyurethaneresin>polyhydrica

2、lcoholsorpolyamine，butalsoauxiliaryrawmaterialslikechainextendercatalyticagent>neutralize匚Bydifferentsyntheticprocessesandcompounddesignswecanproducewater-bonepolyurethaneswithdifferentproperties^1.Thegreatadvantageofwater-bonepolyurethaneisusingwaterasdispe

3、rsionmedium,themethodweusetocomposewater-bonepolyurethaneisself-emulsificationmethod,asitneednottoaddemulsification.Astheepoxyresinhasmanyexcellentproperties:greatbindingpowerandintensity,andithashydroxideradicalwhichcanreactwith-NCOinpolyurethanethenreachth

4、eaimofmodifyingpolyurethane121.Thismodificationovercomesthepolyurethane^shortcomingtoalargeextent⑶.Inourexperiment,wediscussedthetemperatureandtimeofpre-polymerization、thetemperatureofemulsification>theRvalue>theadditionofDMPA>themolecularweightofPEG>theaddi

5、tionofBDOandEDA,thenmakesurethebestmatching.AfterwardsweuseepoxyresintomodifyPU,anddiscussedtheadditionofDMPA>thedifferentkindsofepoxyresinsandtheadditiontoaffectthepropertiesofwater-bonePU,thendeterminethebestmatchingoftheadditionofDMPAandepoxyresinwhichenh

6、ancedthepropertiesofPUthegreatestdegree141.2.ExperimentWefirststudiedthereactiontemperature,reactiontimeonthepropertiesofwater-bonepolyurethaneemulsion.Theninthebestreactiontemperatureandtimewediscusseddifferentratioofrawmaterialsaffectedthewater-bonepolyure

7、thaneemulsion'sappearancestoragestabilityandthewaterproofsthemechanicalpropertyandtheheatenduranceofthecoating.Fromthisweobtainedthebestformula.Thepreparationofepoxyresinmodifiedwater-bonepolyurethaneemulsionmainlydividedintotwostages[5]:Thefirststageispre-p

8、olymer,andthemainreactionisthe-NCOinMDIreactwith-OHinPEGtoproduceCarbamicacidesterbond,whenaddedDMPAthen-COOHadded,afterwardsaddedBDOtoincreasethelengthofthechain,thelastaddingthe-OHtobringinthe