POMZ4513旭化成---FromthepointofviewofPOMproductionprocess,formaldehydeisusedaspolymerizationmonomerinhomopolymerizationmethod,anditschemicalpropertiesareveryactive,whichbringsmanyproblemstotherefiningandpolymerizationprocess.Inthecopolymerizationmethod,trioxaneisastablesixsegmentring,whichiseasiertopurifyandpolymerizecomparedwithformaldehyde.Therefore,whentheprocessrouteoftrioxaneappears,theindustryrarelyc***idersusingformaldehydeasthepolymerizationmonomer.Atpresent,thecopolymerizationtechnologywithtrioxaneasthepolymerizedmonomeraccountsforaboutthetotalproductioncapacityofpolyoxymethyleneintheworld.Accordingtothepropertiesoftheresinproductsofthetwoprocesses,thepropertiesofhomoformaldehydewerehigherthanthoseoftheothertwoprocessesItscrystallinityisslightlyhigher,anditsphysicalandmechanicalpropertiesareslightlystrongerthanthatofCOformaldehyde,butitsthermalstabilityandacidandalkalicorrosionresistanceare***iouslyinferiortothatofCOformaldehyde,andtheprocessingtemperaturerangeisnarrow.However,theprocessingconditi***ofcopolyformaldehydearenotasharshasthoseofhomoformaldehyde.Duringtheprocessing,thethermaldecompositionreleaseslessformaldehydegas,whichcanberecycledformanytimeswithout***iousimpactonproductquality,Theseadvantagesarevaluedandhopedbyusers从POM的生产过程来看,均聚法以甲醛为聚合单体,其化学性质十分活泼,给精制和聚合过程带来许多问题。共聚法以***为聚合单体,***是个稳定的六节环,与甲醛相比更便于提纯和聚合,所以当***工艺路线出现后,工业界就***再考虑用甲醛作为聚合单体了,目前以***为聚合单体的共聚技术约占世界聚甲醛总生产能力的。从两种工艺的树脂产品性能来看,均聚甲醛的结晶度略高,其物理机械性能稍强于共聚甲醛,但其热稳定性、耐酸碱腐蚀性明显不如共聚甲醛,加工温度范围较窄,而共聚甲醛加工成型的条件不象均聚甲醛那样苛刻,加工过程中热分解释放出甲醛气体少,可多次回收利用而不明显影响产品质量,这些优点更是用户所看重和希望的Z4513物性表物理性能额定值单位测试方法密度1.41g/cm³ISO1183熔流率9.0g/10minISO1133收缩率-流量1.6-2.0%InternalMethod机械性能额定值单位测试方法拉伸模量(23℃)2700MPaISO527-2拉伸应力(屈服,23℃)65.0MPaISO527-2拉伸应变(断裂,23℃)50%ISO527-2简支梁缺口冲击强度7.0kJ/m²ISO179热性能额定值单位测试方法热变形温度(0.45MPa,未退火)154℃ISO75-2/B(1.8MPa,未退火)97.0℃ISO75-2/A)