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CHEMISTRYANDADHESION:2006-05-25:(1982-),,,,,,(,150040):,pH,,pHGB/T17657-1999E1,:;;:TQ433.431:A:1001-0017(2006)06-0389-05StudyontheSyntheticTechnologyofUrea-formaldehydeResinunderWeakAcidityConditionZHAOJia-ning,GUJi-youandNIRong-chao(MaterialsScienceandEngineeringCollege,NortheastForestryUniversity,Harbin150040,China)Abstract:Thepossibilityofthesynthetictechnologyofurea-formaldehyde(UF)resinswithlowformaldehydeemissionunderweakaciditycond-itionwasdiscussed.Thetechnologyforsynthesizingurea-formaldehyderesinsunderweakacidityconditionanditsperformancewasalsostudied.ThefunctionalgroupsofUFresinswereanalyzedbyFTIRandchemicalmethod,andthethermalbehaviorofUFresinssynthesizedunderdifferentpHcond-itionwasanalyzedbyDSCy.TheresultsshowedthatUFresinsynthesizedunderweakacidityconditioncouldmeettheresinpropertiesandtherequiredmechanicalpropertiesofplywood,anditsformaldehydeemissionamountfromplywoodcouldreachE1levelofGB/T17657-1999.Thesynthetictechno-logyofUFresinsunderweakacidityconditioncouldreducetheproductioncostandproduceUFresinadhesivewithexcellentperformances.Keywords:Ureaformaldehyderesin;weakacidity;synthetictechnology(UF),(),,,[1],pH,,,,;,,(4~6),,,,,,pHpH,,HseChungyun()[2]pH,pH1.04.88.0,,Uron,,,5--#389#2006286,Vo.l28.No.6,200611.1:();();();()pH,,60~70e6UF-1:24e,NaOHpH4.5,F/U(,)2.570e,(F/U1.6),80e,,pH,(F/U1.3),UF-2:24e,NaOHpH4.5,F/U2.570e,(F/U1.6),90e,,pH,(F/U1.3),UF-3:24e,NaOHpH5.0,F/U2.570e,(F/U1.6),80e,,pH,(F/U1.3),UF-4:24e,NaOHpH5.0,F/U2.570e,(F/U1.6),90e,,pH,(F/U1.3),UF-5:24e,NaOHpH6.5,F/U2.570e,(F/U1.6),90e,,pH,(F/U1.3),UF-6:24e,NaOHpH8.0,F/U2:195epH5.2,pH70e,F/U1.3B1,30min,pH1.2:,2mm,6%~8%;300mm@300mm@5mm;NH4C,l1%;:3,()300g/m2,60min,120e,30s/mm,0.8~1.0MPa22.1UF-2,pH4.5,90e,,5GB/T14074.18-93,11Table1ThepropertiesofresinUF-1UF-3UF-4UF-5UF-6/mPa#s(25e)3235.6373638/%0.120.290.180.420.36/s64.264.665.776.258.67/%50.0349.2948.1448.6650.91,UF-1~UF-5,UF-1~UF-5,,,,F/U,,UF-1,UF-52.2,,,UF-1,UF-6,2#390#CHEMISTRYANDADHESION2UF-1UF-6Table2ThechemicalanalysisresultsofUF-1andUF-6resin/%/%/%/%/%UF-10.1611.230.552.449.5623.95UF-60.1814.860.551.349.3630.311B1.3,UF-123.95%,UF-630.31%UF-1UF-6,UF-6,,,1,,,2.3MAGNA.IR560ATR,--,--1UF-6Fig.1TheIRspectrumofUF-6resin2UF-1Fig.2TheIRspectrumofUF-1resin1--(UF-6),2(UF-1)3348.82cm-13361.90cm-1,1635.28cm-11644.39cm-1,1557.82cm-11549.02cm-1,1457.95cm-11463.95cm-1,1380cm-1,1257.09cm-11252.56cm-1,1148.73cm-11137.31cm-1,1008.99cm-11008.25cm-1,--,,,2.4(DSC),,,DSC,--,5e/min,1%,DSC33DSCFig.3TheDSCspectrumsoftheresinsynthesized,3#391#2006286,Vo.l28.No.6,20063DSCTable3TheinformationoftheDSCspectrumsoftheresinsynthesized/e/e/e/J#g-1UF-177.781.386.266.20UF-477.180.383.967.09UF-574.379.686.851.49UF-680.584.087.686.54,3UF-6,,UF-6,3GB9846-1998,63e3hGB/T17657-19994.12,34Table4Thebondingstrengthandformaldehydeemissionofplywood/MPa/MPa/mg#L-1UF-11.241.061.06UF-31.341.043.62UF-41.080.910.85UF-51.180.920.61UF-61.301.154.56,pH4.5pH5.0,pH5.0pH6.5pH6.5,,pH4-,,,,,,,,(H+),,,,H+,,,,,[3],,,,,UF-1,F/U,85e,1.5h,2F/U2.0,25min;UF-290e,,,,F/U2.5,pH5.5,60~70e,,,,,,,,pH4.5~5.0,pH,pH5.0~6.5,,,#392#CHEMISTRYANDADHESIONpH,pH,,pH,,;pH;F/UF/U,pH,,,,F/U,,70e,,,40e,40e,,,85~90e,,85e,85~90e,(pH4.5),(65e),,5,E1,,,,:[1].[J].,1998,(4):47~52.[2]HSECHUNGYUN,XIAZHIYUNB,TOMITA.EffectofreactionpHonpropertiesandperformanceinureaformaldehyderesins[J].Holzforschung,1994,48:527~530.[3],.[J].,2006,(4):38~39.(上接第380页)chainlength[J].Chemicalphysicsletters,2003,(381):315~321.[6]ABRAHAMULMAN.FormationandStructureofSelf-AssembledMonolayers[J].Chem.Rev.,1996,96:1533~1554.[7]THAVASHI,YMORIKAWA,andHNOZOYE.AdsorptionstateofdimethyldisulfideonAu(111):Evidenceforadsorptionasthio-lateatthebridgesite[J].JournalofChemicalPhysics.2001,114(17):7615~7621.[8]YAKINAGA,TNAKAJIMA,andKHIRAO.Adensityfunction-alstudyontheadsorptionofmethanethiolateonthe(111)surfacesofnoblemetals[J].J.Chem.Phys.114,8555(2001).[9]MCVARGAS,PGIANNOZI,ASELLONI,andGSCOLES.Coverage-DependentAdsorptionofCH3Sand(CH3S)2onAu(111):aDensityFunctionalTheoryStudy[J].J.Chem.Phys.2001,(105):9509~9513.[10]JGOTTSCHALKandBHAMMER.Adensityfunctionaltheorystudyoftheadsorptionofsulfur,mercapto,andmethylthiolateonAu(111)[J].J.Chem.Phys.116,784(2002).[11]FSCHREIBER.structureandgrowthofself-assemblingMono-layers[J].ProgressinSurfaceScience.2000,65(151):151~256.[12]SMWETTERER,DJLAVRICH,TCUMMINGS,SLBER-NASK,andGSCOLES.energeticsandkineticsofthephysisorp-tionofhydrocarbonsonau(111)[J].J.Phys.Chem.b102,9266(1998).[13]DJLAVRICH,SMWETTER,SLBERNASK,andGSCOLES.PhysisorptionandChemisorptionofAlkanethiolsandAlkylSulfidesonAu(111)[J].J.Phys.Chem.B102,3456(1998).[14]YMORIKAWA,THAYASHI,CCLIEW,H.NOZOYE.First-principlestheoreticalstudyofalkylthiolateadsorptiononAu(111)[J].SurfaceScience,2002,(507-510):46~50.[15]PERDEW,BURKE,ERNZERHOF.GeneralizedGradientAp-proximationMadeSimple[J].Phys.Rev.Lett.1996(77):3865~3868.[16]ROSADIFELICE,ANNABELLASELLONI,andELISAMOLI-NARI.DFTStudyofCysteineAdsorptiononAu(111)[J].J.Phys.Chem.B2003,107,1151~1156.#393#2006286