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1、福建農(nóng)林大學(xué)碩士學(xué)位論文摘要AbstractWiththehigllqualitynaturalwoodresourcessharplyreducedintheworldwideandnaturalforestreservesprotectionprojectcarriedinchina,thestructuresofwoodresourceshavechangedfundamentally.Gluingwoodandwoodcomposites,whicharemadeofsmall.diameterlumbersandth
2、innedtimberbecomeinsteadofthenaturalhi曲qualitywood,andwillbethemaintrendofthewood·basedpanelsthatbasedontheGlueandthegullingtechnology.Urea-formaldehyderesinadhesiveisthemostwidelyusedadhesives,butithasmanyshortcomings,suchaslowerwaterresistance,嘶spadhesivelayer,esp
3、eciallythehighlyfreeformaldehydecontentandformaldehydeemissioncontaminateenvironmentserious.Therefore,it’SnecessarytostudylowtoxicUFwhichhaslowfreeformaldehydecontentandformaldehydeemission,butitsdevelopmentisblockedbythelongercuringtimeandthehighercuringtemperature
4、.UFresinwimdifferentF/UmolarratioWassynthesizedanditspropertiesweretestedtochooseanexcellentUFresinwithlowmolarratiointhispaper.Thendifferentmodifiers(suchasPVAc,PAPI,resorcin01)andcuringagent(suchasammoniumchloride,P—toluenesulfonylChloride,ethylenediaminehydrochlo
5、ride,oxalicacid,hydrochloricacid,phosphoricacid,etc.)arechosentomodifyUF,andtheirinfluenceofcuringtemperatureandbondingstrengthforUFonthesingleandcompoundconditionwerediscussed.Inaddition,theFTIRandDSCwereappliedtodiscussabouttheinternalactivegroupschangedandcuringr
6、eactionmechanismofUFbyanalysisingonthesamplesofeachstageofmodifiedUF.TheperformancetestofUFshowedthat,theviscosity,solidcontentofUFresindecreasedwiththeFlUmolarratioincreased.Atthesametime,thecuringtimesignificantlyshortensandbondingstrengthshowedarisingtrend.Inaddi
7、tion,freeformaldehydecontentofUFresinreducedwithF/Umolarratiodecreased,andtherewerenomoreChangeswhenthemolarratioWaslessthan1.3.The1.3moleratioofUFWasusedasresearchobjectinthispaper.Single·factorexperimentsareusedtoresearchone·-componentcuringagentandasinglemodifier
8、whiche蔬ctonthepHandwaterresistancebondingstrengthofUFresin.Theresultsshowedthat,usingethylenediaminehydrochlorideortoluenesulfonylchloride