CO2硬化碱性酚醛树脂材料及工艺的研究.pdf

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1、C02硬化碱性酚醛树脂材料及工艺的研究TheResearchonProcessandMaterialsofC02一curedAlkalinePhenol-FormaldehydeResinAbstractThenewtypecold·-boxtechniqueofC02—-curedAlkalineResolphenolresinisputforwardbyEnglishFoseeoCompanyin1989，whichhasmanyadvantageousproperties，such嬲lowpoisonouscontent(freephen01<

2、0．2％，freeformaldehyde<0．1％)，lowenvironmentpollution,simplecuringprocess，andhi曲productionefficiencyetc．Theresinsandisbetterthansodiumpolyarcylateandsodiumsilicatesandinstrengthenathiglltemperatureandhumidity．Itbringsthebenefitofenvironmentprotectandtechnologyforfoundryforthefirs

3、ttime．andmanyexpertsathomeandabroadpaymoreattentiontoitforitsexcellentproperties．Theexperimentsa坞donefi'omthefourmainparts鹪follow：(1)First,the∞枷锄conditionswhichaffectthesynthesisofphenolicresinarediscussedbyorthogonalandsin#efactorexperiments，andtheoptimumconditionsRreobtained：

4、thecatalystisLiOH，catalyst／phenol=0．2／1(mole-ratio)，phenol／formaldehyde=1／2．0(mole-ratio)，thereactiontimeiscontrolledbytheviscosityofresin,theviscosityofresinis35s．Formaldehydeisaddedbymatn5ofdropping．(2)OnthebaSisoftheoptimumsynthesisconditions，thetechniquesoftheC02-curedpheno

5、licresinforcross·linkingagentareresearched，inthissystemofresinauewtypecross-linkingagentisintroduced，thesinglefactorexperimentsofthedispcrsantagent、Rsalt、silane、modifyingagentandotherfactorsinthis越ndofcementingagentsystemaredoneaccordingtothemeasurementofcompressivestrengthofre

6、sinsandcorerthentheoptimumcontentofallfectomisconfmned．Theresultshow：whenresincontentis3．O％．alkalicontentis20％，curedagentcontentRsaltis20％～22％，andcouplingagentcontentisO．8％．thestrengthofsandcoreishighest．TheinfluenceofC02blowingtimeandblowrateandhumidityandkeepingtimeofsandcore

7、eteoncompressivestrengthofsandcO∞黜discussedfurther．Theresultsshow：whentheblowingtimeislOOsandtheblowrateisO．65mJ／h,thestrengthishigher．Humidityandkeepingtimeofsandcorehavesmallinfluenceonthemengthofsandcore．Theresearchonphenolformaldehyderesinwhichmodifiedbyacrylicacid、acidanhy

8、drideetcagedone．(3)Thecuredmechanismofphenolformaldehy