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1、上海交通大學(xué)碩士學(xué)位論文聚全氟乙丙烯擠出發(fā)泡技術(shù)的研究姓名：楊中林申請學(xué)位級別：碩士專業(yè)：聚合物加工指導(dǎo)教師：周持興;陸根生20081201上海交通大學(xué)工程碩士學(xué)位論文摘要關(guān)。調(diào)整合適的溫度設(shè)置，可得到滿足最大發(fā)泡度所需的熔體強度。調(diào)整自由發(fā)泡時間，可在很大程度上影響發(fā)泡度。擠出壓力、模具、生產(chǎn)速度主要影響FEP熔體的剪切速率，在合適的剪切速率下發(fā)泡，對改善發(fā)泡絕緣的外觀質(zhì)量及橢圓度有明顯影響。關(guān)鍵詞：FEP，發(fā)泡，熔體強度，擠出第II頁上海交通大學(xué)工程碩士學(xué)位論文ABSTRACTSTUDYON
2、THEEXTRUDINGFOAMINGOFTETRAFLUOROETHYLENE/HEXAFLUOROPROPYLENECOPOLYMERABSTRACTThemorerequirementsinthecablewithgoodtransmissionaswellashighworktemperatureandflame-retardant,thetraditionalfoampolyethylenecommunicationcableisdifficulttomeettherequiremen
3、ts.Withexcellentresistancetolow-temperaturehigh-performance(-200℃~260℃)andexcellentflameretardant(oxygenindex95)ofTetrafluoroethylene/Hexafluoropropylene(FEP)Copolymerissuitablealternatives.Tosolutetheseproblemsultimately,thecableindustrywouldlikeFEP
4、canfoamingextrudeaswellaspolyethylene.However,themeltviscosityofFEPisveryhigh,sensitivetoshearspeed,soitisdifficultytofoam.Atpresent,onlySwitzerland,Japan,asmallnumberofdevelopedcountrieshavemasteredthetechnology.InordertofundamentallygrasptheFEPfoam
5、ingtechnology,itisnecessarytocarryoutthestudyingprocessofFEPfoamingtheoryandtechnology.Themaincontent:1.Thepropermeltstrengthalwaysisthekeytoachievegoodfoaming.In第III頁上海交通大學(xué)工程碩士學(xué)位論文ABSTRACTthepaperdiscussedthefactorsoftheFEPmeltstrength,focusedonther
6、elationshipbetweenthemeltstrengthandfoaming.Thiscanofferthetheoreticalfoundationforthetechnologyoffoaminginthefurther.2.Analysisofthetechnicalparametershowtoaffectthefoamingresults.Thetechnicalparametersaffectthefoamdegreeandtheappearanceofqualityoft
7、hefoaminsulation.Themeltstrength,freefoamingtime,gasinjectionpressureaffectthefoamdegree.Theshearrate,conductorpreheatingtemperatureandtheformofcoolingaffecttheappearanceofqualityofthefoaminsulation.Thefoamdegreecanbecontrolledbyadjustingthefreefoami
8、ngtime.Theextrusionpressure,die,andthespeedofproductionaffecttheshearrateofFEPmelt.It’simportanttoimprovethequalityofthefoaminsulationandreducethedegreeofellipticalintherightshearrate.Keywords:FEP，foaming，meltstrength，extrusion第IV頁上海交通大學(xué)工程碩士學(xué)位論文正文第一章
