天然胶丁晴胶氟胶特性Natural rubber NBR fluorine gum characteristicsWord文件下载.docx

天然胶丁晴胶氟胶特性Natural rubber NBR fluorine gum characteristicsWord文件下载.docx

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2,accordingtotheformisdividedintoblockrubber,latex,liquidrubberandrubberpowder.

3,accordingtotheuseofdividedintogeneralandspecialtype.

Thegeneralrubberhasgoodcomprehensivepropertiesandiswidelyused.Themaincontentsareasfollows:

naturalrubber.Isoprenerubber,alsocalledsyntheticnaturalrubber.Styrenebutadienerubber,referredtoasSBR.Thebutadienerubber,referredtoasBR.

Nitrilerubber,referredtoasNBR.

Preparedbycopolymerizationofbutadieneandacrylonitrile.Withgoodoilresistance,heatresistance,coldresistance,pressureresistanceandwaterresistance,airtightnessandexcellentbondingproperties,andabrasionresistanceissuitable,thetemperatureisapproximately40DEGC120commonlyused,canbeusedforalongtimeatthetemperatureof120DEGCintheairoroilat150c..

Itiseasytousemetaltomouldthehydraulicsealsinanyshape.Therefore,NBRismostsuitableformakingsealsforhydrauliccylinderswhoseworkingpressureisnotgreaterthan32Mpa.Speciallydesignedformula,easytopresshairoil:

wearable,canbearthemechanicalaxisspeedofthecar3000rpm/below（atthistimetherubberhardnessis70degrees）.

Siliconerubber.SILICONE

Thebackboneconsistsofalternatingatomsofsiliconandoxygen,withorganicgroupsonsiliconatoms.Highandlowtemperature,ozoneresistance,goodelectricalinsulation.Usetemperatureof-40DEGC+220DEGC;

inhightemperature,oilresistant,abrasionresistance,oilresistance!

Theutilitymodelisespeciallysuitableforthecrankshaftoilsealintheautomobileengine,whichisnotresistanttotemperatureandvolatileoil（diesel,gasoline）,andhastheresistancetooxygen,ozoneandsunlight（ultravioletlight）.

Fluorinerubber.Viton

Asyntheticrubbercontainingfluorineatomsinasubstructure.Usually,thenumberoffluorineatomsinthefluorinecontainingunitinthecopolymerisexpressedasfluorinerubber23,andthecopolymeristwovinylidenefluorideandthreefluorinevinylchloride.Fluorinerubber,hightemperature,oilresistance,chemicalresistance.Itisresistanttooil,hightemperature,chemicalresistance,andhasthecharacteristicsofacidandalkaliresistance.Usetemperature-30+280.Theutilitymodelissuitableforacrankshaftoilsealinajetengine,atimingoilsealandaOringandasealingringusedforchemicals

Characteristicsofsilicagel

Itisdividedintocoarseporesilicagelandfineporesilicagel

Silicagelcanabsorbwater,andcanalsoabsorbacetyleneandcarbondioxide.Withthedecreaseoftemperature,thefirstadsorptioniswater（atnormaltemperature,about25DEGC）,followedbyacetyleneandcarbondioxide（thelowerthetemperature,thestrongertheadsorptioncapacity）.

Takingadsorptionwaterasanexample,theparticlesizerangedfrom/mm4to8,andthedynamicadsorptioncapacitywas/%6to8.Afterdrying,theairmoisturecontentwas/g,M-30.03,andtheairdewpoint/temperaturewas-52afterdrying

Regenerationtemperature/temperature140~160

Silicagelhaslargeradsorptioncapacityforwater,lowerregenerationtemperatureandcheaperprice,sosilicagelismainlyusedasadsorbenttoadsorbcarbondioxideandacetyleneatlowtemperatureinairseparationunit.Itsdisadvantageisthatmorepowder.

Therearetwokindsofsilicagelporeandpore,andthetwoaredifferentindiameter.Theporesizeofcrudesilicagelis5~10nm（1nm=10-9m,NM）,andthespecificsurfaceareaofsilicagelis100to300m2/gpergram.Ithasstrongwaterabsorptionabilityandisnoteasytobebrokenafterabsorbingwater,

Goodmechanicalstrength,oftenusedinthedryertoabsorbmoisture.Theporediameterofporesilicagelis2.5~4nm,andthespecificsurfaceareais400~600m2/g.Commonlyusedtoabsorbcarbondioxideandacetylene,adsorptionwatereasilybroken.Theadsorptionprocessiscarbondioxideadsorberin-110~-120underlowtemperature,goodadsorptioneffectofCO2,alsocanadsorbacetylene.Becausethetemperaturelowerthan-130DEGCcarbondioxidesolidprecipitation,solidcarbondioxidenotonlyadsorbedsilicagel,andwillplugtheadsorber.Theadsorptionofacetyleneiscarriedoutinliquidairandoxygenintheadsorber,theadsorptiontemperatureat-170~-180degreescelsius.

Threeyuanethylenepropylenerubberisakindofrubbermadebycopolymerizationofethyleneandpropylenethroughsolution,andthenthirdmonomer（ENB）isintroduced.Threeyuanethylenepropylenerubberisbasicallyasaturatedpolymer,agingresistanceisverygood,goodweatherresistance,goodelectricalinsulationperformance,goodchemicalresistance,goodimpactelasticity.Themaindisadvantageofethylenepropylenerubberisitsslowcuringrate.Itisdifficulttousewithotherunsaturatedrubber,anditsadhesionandadhesionareverypoor,sotheprocessingperformanceisnotgood.

Accordingtothecharacteristicsofethylenepropylenerubber,mainlyusedintherequirementsofagingresistance,waterresistance,corrosionresistance,electricalinsulationinseveralareas,suchaslightfortiresidewall,heatresistantconveyorbelt,wireandcable,anti-corrosionlining,gasket,buildingwaterproofsheet,sealdoorsandwindows,householdappliancesandaccessories,plasticmodification.Propertiesandapplicationsofethylenepropylenerubber.

Ethylenepropylenerubberismainlymadefromethyleneandpropylene.Itisresistanttoaging,electricalinsulationandozoneresistance.Ethylenepropylenerubbercanbefilledwithoilandfilledwithcarbonblack.Thepriceoftheproductislow,andthechemicalstabilityoftheethylenepropylenerubberisgood.Theabrasionresistance,elasticity,oilresistanceandtheproximityofstyrenebutadienerubberareclose.Ethylenepropylenerubberiswidelyused.Itcanbeusedasthetireside,rubberstripandinnertube,aswellaspartsofautomobiles.Itcanalsobeusedaswires,cables,wrappingandhighvoltageandextrahighvoltageinsulationmaterials.Canalsomanufactureandshoes,sanitaryproductsandotherlightcoloredproducts.Propertiesandimprovementofethylenepropylenerubber:

One,1,lowdensity,highfilling

Thedensityofethylenepropylenerubberisakindoflowerrubber,itsdensityis0.87.Coupledwiththelargeoilfilledandfilled,therebyreducingthecostofrubberproducts,makeupfortheshortcomingsofhighpriceofethylenepropylenerubber,EPDMrubberandhighMooneyvalue,highfillingaftermechanicalcandecreaseslightly.

2,agingresistance

Ethylenepropylenerubberhasexcellentweatherresistance,ozoneresistance,heatresistance,acidandalkaliresistance,watervaporresistance,colorstability,electricalproperties,oilfillingandroomtemperaturemobility.Ethylenepropylenerubberproductscanbeusedat120degreesforalongtimeandcanbeusedbrieflyorintermittentlyat150-200degreescentigrade.Addingsuitableantioxidantcanimprovetheuseoftemperature.Peroxidecrosslinkedthreeyuanethylenepropylenerubbercanbeusedinharshconditions.Threeyuanethylenepropylenerubberinozoneconcentration50pphm,stretch30%conditions,upto150hormore,notcracking.

3,corrosionresistance

Duetothelackofpolarethylenepropylenerubber,lowunsaturation,andvariouspolarchemicalssuchasalcohol,acid,alkali,oxidant,refrigerants,detergents,animalandvegetableoils,ketoneandfatwerehighresistance;

butinthegenusandgenusofaromaticlipidsolvent（suchasgasoline,benzene）andmineralpoorstabilityoil.

Underthelong-termactionofconcentratedacid,theperformancewillalsodecline.InISO/TO7620inacollectionofdataofnearly400kindsofcorrosivegasandliquidchemicalsonvariousrubberperformancefunction,andtheprovisionsofthe1-4gradeindicatesthedegreeoftheeffect,effectofcorrosivechemicalsonthepropertiesofrubber:

Levelvolumeswelling/%lowerhardnessvaluesinfluenceonproperties

1,10,10,slightorabsent

210-20,20smaller

330-60.30medium

4>

60>

30serious

4,steamresistance

Ethylenepropylenerubberhasexcellentwatervaporresistanceandissuperiortoitsheatresistance.Insuperheatedsteamat230DEGC,thereisnochangeinappearanceafter100h.Whilefluorinerubber,siliconerubber,fluorinesiliconerubber,butylrubber,nitrilerubberandnaturalrubberunderthesameconditions,experiencedashorttime,theappearanceofobviousdeterioration.

5、resistancetohotwaterperformance

Ethylenepropylenerubberhasbetterresistancetooverheatedwater,butitiscloselyrelatedtoallvulcanizationsystems.IntwotwoTMTDforcuringmorpholine,ethylenepropylenerubbervulcanizationsystem,125degreesinthesuperheatedwaterimmersionafter15months,thechangeofmechanicalpropertiesisverysmall,thevolumeexpansionrateofonly0.3%.

6,electricalperformance

Ethylenepropylenerubber（EPR）hasexcellentelectricalinsulationandcoronaresistance,anditselectricalpropertiesarebetterthanornearstyrenebutadienerubber,CSM,polyethyleneandxlpe.

7,elasticity

Becausethereisnopolarsubstituentsofethylenepropylenerubbermolecularstructure,themolecularcohesiveenergyoflowmolecularchaincanmaintainflexibilityinawiderange,afterdiscussiona