低温固化低毒脲醛树脂胶的研制

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1、福建农林大学硕士学位论文摘要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