无水碳酸镁(mgco3)的制备与阻燃性能分析-(5909)

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1、AbstractAbstractOnthebasisofbroadandthoroughsurveysandresearchesoftheforegoingdocuments,aconciseopinionontheaspectsofthepreviousresearches,preparations,modificationandflameretardantpropertyofmagnesite(MgCO3)wasillustrated.Hydrothermalreactionandsynthesismet

2、hodstofabricatetheinorganicmaterialmagnesiteweremainlyexplored.Basedontheformerpapers,thehydrothermalsynthesisprocedurewasadoptedinthisthesis.Magnesiteofthesinglephasecompositionwhichcontainsnocrystallizatedwaterhasbeensynthesizedbyusingsodiumhydroxide-assi

3、stedhydrothermaltreatmentmethodswithmagnesiumchlorideasthesalt,and((NH4)2CO3﹣NH4HCO3)astheprecipitator.Theeffectsoftheamountofsodiumhydroxide,theinitialconcentrationofreactants,hydrothermaltemperatureandhydrothermaltimeonmagnesitepowderswerestudiedsystemica

4、llybySEMandXRD.Magnesitepowderswiththepeculiarmorphologyhavebeenpreparedbyusingdifferentchemicaladditives.Withsurface-modifyingagents,themodifiedmagnesitewasfilledintopolypropyleneasaflameretardant.Theinfluenceoftheadditionofmagnesiteontheflame-retardantand

5、mechanicalpropertieswerepreliminarystudied.Themaincontentsofthedissertationwereroughlyasfollows:1.Magnesitehasbeenpreparedbyhydrothermalmethods.Theinfluencesoftheamountofsodiumhydroxide,theconcentrationofreactants,hydrothermaltemperatureandhydrothermaltimeo

6、nmagnesiumcarbonatepowderswereinvestigatedscientifically.Thecharacteristicdiffractionpeaksarestrongandsharp,whichshowthegreatcrystallinityandthesinglephasecomposition.2.Theeffectoftheadditionofdifferentchemicaladditivesandtheiramountsonmorphologyofmagnesite

7、powderswereinvestigated.TheresultsindicatethattheMgCO3ofsinglephasecompositionpowderscontainednocrystalwaterwithshortrod-likeshapeandsphericalshapemorphologycanbepreparedwithdipotassiumphosphate.3.Surfacemodificationprocessofmagnesitebystearicacidwasexplore

8、d.InfluencesofmodificationtemperatureandtimeonmodificationeffectswereIII万方数据Abstractinvestigated.Modificationeffectswereevaluatedbymeasuringthesurfacepropertiessuchasactivationindexandangleofcontact.Th