聚全氟乙丙烯挤出发泡技术的研究

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1、上海交通大学硕士学位论文聚全氟乙丙烯挤出发泡技术的研究姓名：杨中林申请学位级别：硕士专业：聚合物加工指导教师：周持兴;陆根生20081201上海交通大学工程硕士学位论文摘要关。调整合适的温度设置，可得到满足最大发泡度所需的熔体强度。调整自由发泡时间，可在很大程度上影响发泡度。挤出压力、模具、生产速度主要影响FEP熔体的剪切速率，在合适的剪切速率下发泡，对改善发泡绝缘的外观质量及椭圆度有明显影响。关键词：FEP，发泡，熔体强度，挤出第II页上海交通大学工程硕士学位论文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页上海交通大学工程硕士学位论文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页上海交通大学工程硕士学位论文正文第一章