CAJ | 학술논문

研究了重包装薄膜对低密度聚乙烯（LDPE）分子结构的要求，结合反应温度、反应压力、相对分子质量调节剂种类对LDPE分子结构的影响，确定了重包装薄膜用LDPE?2320D的关键工艺参数。反应压力为270~290?MPa，反应器第一至四区的温度为280~290?℃，采用丙烯和丙醛作为相对分子质量调节剂时，2320D的支化度为13.6~14.6个/1?000?C，密度为0.921?5~0.922?5?g/cm3，正己烷提取物含量小于60?mg/kg。用2320D吹塑的薄膜横向拉伸屈服应力约为11.0?MPa，雾度小于15.0%；30?μm厚的薄膜在120?℃加热60?s后，纵、横向收缩率分别为59.3%，29.7%，优于用进口同类产品吹塑的薄膜。
연구료중포장박막대저밀도취을희（LDPE）분자결구적요구，결합반응온도、반응압력、상대분자질량조절제충류대LDPE분자결구적영향，학정료중포장박막용LDPE?2320D적관건공예삼수。반응압력위270~290?MPa，반응기제일지사구적온도위280~290?℃，채용병희화병철작위상대분자질량조절제시，2320D적지화도위13.6~14.6개/1?000?C，밀도위0.921?5~0.922?5?g/cm3，정기완제취물함량소우60?mg/kg。용2320D취소적박막횡향랍신굴복응력약위11.0?MPa，무도소우15.0%；30?μm후적박막재120?℃가열60?s후，종、횡향수축솔분별위59.3%，29.7%，우우용진구동류산품취소적박막。
The?key?technological?parameters?for?producing?low?density?polyethylene(LDPE)?2320D?for?heavy?packing?film?use?were?determined?by?exploring?the?requirements?of?molecular?structure?that?LDPE?should?meet?for?manufacturing?heavy?packing?film,?and?the?effects?of?the?reaction?temperature,?reaction?pressure?and?types?of?relative?molecular?mass?modifiers?on?the?molecular?structure?of?LDPE.?LDPE?2320D?had?branching?degree?of?13.6-14.6/1?000?C,?density?of?0.921?5-0.922?5?g/cm3?and?content?of?n-hexane?extractives?less?than?60?mg/kg?when?the?reaction?pressure?was?270-290?MPa,?the?reaction?temperature?from?the?first?to?the?fourth?zone?was?280-290?℃,?and?propylene?and?pro-panal?were?used?as?relative?molecular?mass?modifiers.?The?blown?film?made?of?LDPE?2320D?possessed?transverse?ten-sile?stress?at?yield?of?11.0?MPa?or?so?and?haze?below?15.0%.?The?machine?and?transverse?shr inkage?of?the?30?μm?thick?film?made?of?the?resin?were?59.3%?and?29.7%,?respectively,?after?the?film?was?treated?at?120?℃?for?60?seconds,?which?was?superior?to?those?of?the?film?made?of?its?imported?counterparts.