低溫固化低毒脲醛樹脂膠的研制

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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

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