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测试了典型工艺得到的聚烯烃薄膜的雾度及透射率,利用WLI、LS、AFM和2D-WAXD等方法对薄膜的表面结构和内部结构进行了表征,并分析了结构与薄膜雾度的关系。表征结果显示,对于典型工艺的聚乙烯薄膜,吹膜的雾度大于流延膜的雾度;聚乙烯表面雾度与表面粗糙度具有线性相关性,内部雾度与球晶的尺寸有正相关关系;聚乙烯薄膜的表面和内部可以呈现不同的取向特征。市场上的聚丙烯薄膜大部分由流延法或双向拉伸法制得;双向拉伸薄膜内部通常没有完善的球晶结构,内部雾度非常低。对比聚乙烯薄膜和聚丙烯薄膜可知,表面雾度与表面粗糙度和表面结构特征有关。聚丙烯薄膜中大区域的表面起伏会明显增加表面粗糙度,但对表面雾度贡献很小。 相似文献
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采用DSC差示扫描量热仪和广角X射线衍射仪研究了F800EPS等4种聚丙烯共聚物的热性能和结晶行为。发现F800EPS作为流延聚丙烯(CPP)膜热封层专用料在加工应用上与国外同类产品存在差异的原因可归结为它们之间的热性能和结晶行为不同。 相似文献
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探讨了真空镀铝聚丙烯流延复合膜的加工性能对芯层专用料的要求,并对研制的复合膜芯层专用料以及用该专用料制成的共挤流延复合膜的镀铝加工性能进行了研究,结果表明,该专用料及用其制成的真空镀铝复合膜的性能与进口产品相当。 相似文献
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介绍利用小本体聚丙烯(PP)粉料研制生产聚丙烯吹膜专用粒料产品,包括该产品研制过程中的试验配方筛选,生产工艺确定及吹制聚丙烯薄膜情况,产品检测情况。其中包括多元共混体系的研究以及抗氧,改质复合助剂体系的确定。 相似文献
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孙可华 《国内外石油化工快报》2008,(2):22-23
中国石油石化研究院兰州化工研究中心承担的多品级聚丙烯薄膜专用料工业化开发项目通过甘肃省科技厅组织的专家鉴定。兰化研究中心与兰州石化公司通过对聚合工艺、造粒工艺和添加剂体系的优化,在兰港公司11万t/a聚丙烯装置上成功开发出聚丙烯薄膜F500和F600专用料,解决了聚丙烯薄膜专用树脂生产过程中产品灰分含量高和成膜时鱼眼多等问题,提高了产品质量。 相似文献
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孙可华 《国内外石油化工快报》2006,36(3):23-24
抚顺乙烯化工有限公司开发的聚丙烯流延膜RC090专用料工业化试生产获得成功,各项技术指标均达到要求。聚丙烯流延膜是通过熔体流延骤冷生产的一种无拉伸、非定向的平挤薄膜。具有透明度高、挺度好、热封温度低、耐热、防潮、阻隔性好、印刷和复合适应性强、表面光滑、耐蒸煮等优点,广泛应用于冷冻食品、医药卫生和液体包装等领域。 相似文献
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T. K. Srinivasa Gopal P. K. Vijayan K. K. Balachandran P. Madhavan T. S. G. Iyer 《Food Control》2001,12(8):S348-527
Fish curry processed in metal cans is popular in the overseas markets. An important limitation with the use of metal cans is the undesirable taste imparted to the products on storage. Flexible pouches are an ideal alternative to metal cans. Extensive work carried out at Central Institute of Fisheries Technology has been able to identify indigenous pouches, which are as good as imported pouches. This has been done after collecting different types of indigenous and imported flexible pouches, analyzing their composition and conducting detailed studies on their physical and food contact application properties. Two indigenous pouches with composition 12 micron polyester/12 micron aluminium foil/87.5 micron cast polypropylene and 12 micron polyester/15 micron aluminium foil/70 micron cast polypropylene have been selected and got made by indigenous laminators and an imported one with configuration 12 micron polyester/15 micron aluminium foil/75 micron cast polypropylene were used for further experiment on processing fish curry. Traditional Kerala style mackerel fish curry was processed in the retort pouches of the above configurations. About 220 g fish curry was packed in each pouch (15.5 cm×7 cm). Process requirements were worked out by measuring heat penetration using thermocouples introduced into the pouches. Fish curry processed to a F0 value of 8.43 gave an acceptable product with desired texture and sensory characteristics. The physical properties of the pouches studied showed that the indigenous pouches of the above configurations were good enough to give a shelf life of 1 year at room temperature. The curry remained sterile throughout the storage period at ambient temperature (25–30°C) and retained acceptable sensory characteristics. 相似文献
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熔融指数是划分聚丙烯牌号的关键指标。在锦西石化聚丙烯装置开车期间,聚丙烯粉料熔融指数分析数据重复性不好,且与聚丙烯粒料的熔融指数存在较大差异。车间无法正常组织生产,聚丙烯产品无法在装袋前确定正确牌号。针对这一问题,通过实验,逐步查找聚丙烯粉料、粒料的熔融指数差异的根本原因。确定主要原因在于聚丙烯粉料未去活,测试粉料熔融指数前未进行合适的样品预处理。通过实验确定最优的样品预处理方法。使用这一方法便于生产过程控制,保证产品的质量稳定,提高了公司的经济效益。 相似文献
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Commercial Application of CPP for Producing Ethylene and Propylene from Heavy Oil Feed 总被引:3,自引:0,他引:3
HouDianguo XieChaogang WangXieqing 《中国炼油与石油化工》2003,(1):19-22
A new process named CPP (Catalytic Pyrolysis Process) for producing ethylene and propylene from heavy oil feedstock has been developed. The catalyst CEP was specially designed for this process, which has bi-functional catalytic activities for both carbonium ion reaction and free radical reaction, so as to maximize the yields of ethylene and propylene. The commercial trial showed that the yield of ethylene and propylene was 20.37% and 18.23% respectively in maximum ethylene operation with Daqing AR as feedstock, and the yield of ethylene and propylene was 9.77% and 24.60% respectively in maximum propylene operation by using the same feedstock.Compared with steam cracker, the feed cost of CPP is much lower for producing ethylene and propylene. 相似文献
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Mark G. Wendaur 《Natural Gas \u0026amp; Electricity》2015,32(3):7-10
President Obama and the Environmental Protection Agency (EPA) recently passed new regulations requiring America's electric power plants to reduce greenhouse gas emissions. These regulations come in the form of the Clean Power Plan (CPP). The purpose of the CPP is to reduce the amount of carbon dioxide emitted from existing and new electric power plants, also referred to as electric‐generating units (EGUs). In order to achieve the lower CO2 emission goals of the CPP, this nation will need to increase its use of natural gas for electricity generation. 相似文献
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纳米成核剂在聚丙烯中的应用研究 总被引:1,自引:1,他引:0
综述了纳米成核剂在聚丙烯中的应用研究进展,重点讨论了无机纳米成核剂对聚丙烯力学性能和结晶行为的影响。纳米成核剂的加入对聚丙烯的β晶结晶过程有明显的诱导作用,提高了β晶的含量,可使聚丙烯的刚性和韧性同时得到增强。 相似文献
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研究开发的阻燃聚丙烯专用料是以聚丙烯为基础树脂,添加阻燃、稳定等多种助剂,经熔融、混炼加工加成。试验结果表明,选用的B阻燃体系与聚丙烯材料的匹配性好,阻燃效果好,对其它性能影响较小;该专用料加工工艺简单,便于操作控制。 相似文献
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聚丙烯成核剂超声细微化制备工艺的优化 总被引:2,自引:2,他引:0
以2,4-二叔丁基苯酚为原料,通过桥联化反应、环构化反应、水解反应和成盐反应合成了2,2′-亚甲基-双(4,6-二叔丁基苯氧基)磷酸钠,再采用超声沉降技术制备了一种细微化有机磷酸盐成核剂;采用正交实验优化了细微化有机磷酸盐成核剂的工艺条件;用该成核剂对聚丙烯进行改性。正交实验结果表明,细微化有机磷酸盐成核剂的优化工艺条件为:有机溶剂与水的质量比为90∶10,超声振荡60min,超声频率70kHz,未细微化有机磷酸盐的质量分数为25%。改性实验结果表明,成核剂添加量(基于聚丙烯的质量)为0.1%时,改性聚丙烯的弯曲模量可提高30.17%,缺口抗冲强度可提高109.25%。 相似文献