高流动性共聚聚丙烯的开发与应用现状

介绍了高流动性共聚聚丙烯在注塑制品中的应用优势以及国内外高流动性共聚聚丙烯开发生产及应用现状。高流动性共聚聚丙烯在流动性提高的同时，产品刚性和韧性达到了很好的平衡，综合性能优异，在注塑过程中可缩短加工周期，降低加工温度、注塑压力和能耗。成型相同的薄壁制品时，熔体流动速率为65g／10min的该类产品比传统熔体流动速率为35g／10min的产品注射温度可以降低20～50℃，成型周期减少27％，由于其优良的加工性，可满足大型薄壁注塑制品的生产及应用需要。     

快速注塑薄壁制品聚丙烯专用料的助剂研究进展

助剂改性作为聚丙烯树脂改性的一种方式,灵活性好、简单易操作,是目前最活跃、最有效的改性方法之一,而快速注塑薄壁制品聚丙烯专用料作为其中的一类助剂改性材料,力学、光学以及物理性能优异,近年来备受欢迎。介绍了专用料的氧化机理以及抗氧化机理;同时详细介绍了专用料开发中必不可少的几类助剂的发展历程、分类以及对聚合物各项性能的影响,本文将为今后快速注塑薄壁制品聚丙烯专用料的开发中关于助剂的优选提供一定的工业参考价值。     

快速注塑薄壁制品用PP的结构与性能

采用凝胶渗透色谱、差示扫描量热法、偏光显微镜照片及计算机辅助工程(CAE)软件等分析了快速注塑薄壁制品用聚丙烯(PP)K1840的微观结构、宏观性能及其加工性能,并与国外同类产品进行了对比.结果表明:快速注塑薄壁制品用PP K1840分子链结构合理;较高的相对分子质量和适宜的相对分子质量分布使其具有优异流动性的同时保持...     

中国石化聚丙烯新品成功进入薄壁注塑高端市场

<正>7月,化销华中分公司销售洛阳石化聚丙烯新品MN90B共594吨,初步实现了批量销售,标志着该产品自5月份推出以来,已快速获得薄壁注塑高端市场认可。洛阳石化聚丙烯MN90B是中国石化第一款超高流动性蓝相高结晶聚丙烯产品,熔融指数可高达100g/10min,主要应用于高端薄壁注塑制品领域。相较通用产品,该原料可显著降低加工温度、提高生产效率,且原料更为环保安全,成品外观也更为透亮。     

快速注塑薄壁制品用聚丙烯的开发

2011年1月,中国石油化工股份有限公司北京燕山分公司(简称燕化公司)树脂应用研究所承担的快速注塑薄壁制品用聚丙烯(PP)的开发课题顺利通过燕化公司评定。     

科技专栏新品开发

天津成功开发出系列注塑专用料 日前,乙烯厂成功开发出了高流动性抗冲型共聚丙烯注塑专用料系列产品TJPP2027和TJPP202228,填补了国内单环管工艺生产的空白。 该产品可广泛用于家电、洗衣机、摩托车和汽车配件等大型薄壁注塑制品。由于生产难度大、技术含量高,多年来国内市场一直被日本、韩国和新     

高熔体流动速率薄壁注塑聚丙烯专用料的结构与性能分析

采用多种分析测试方法，对3类高熔体流动速率薄壁注塑聚丙烯（PP）专用料的熔融结晶性能、光学性能、分子量分布、力学性能、毛细管流变性能、热收缩性能进行了分析研究。结果表明，K1860与2种市售主流PP1、PP2各项性能相当，其中K1860分子量分布相对PP1、PP2较窄，弯曲性能、拉伸性能更优，可满足大型薄壁注塑制品的生产要求。     

福建联合石化成功试产聚丙烯薄壁注塑新产品

正近日,福建联合石化成功产出聚丙烯薄壁注塑新产品1148TC,填补了福建薄壁注塑原料市场的空白,福建客户可实现就近采购,降低物流成本。此次产出的聚丙烯薄壁注塑新产品1148TC,具有无味、透明、韧性好、流动性好等优点,下游客户试用后顺利产出优质一次性餐盒,产品得到客户高度认可。随着国内外卖等行业的飞速发展,对餐盒的需求大增,而薄壁注塑是餐盒的主要原料之一,需求量增速逐渐加     

基于Moldlfow的PP薄壁制品注塑工艺计算机模拟

利用Moldflow对Taguchi法和L16(45)正交表所设计出的聚丙烯(PP)薄壁制品注塑方案进行仿真,研究发现：注射时间、保压时间、保压压力是影响PP薄壁制品翘曲变形的主要因素,并且得到最优注塑参数为：注塑机料筒温度180℃,模具温度75℃,注射时间3.0 s,保压时间3.5 s,保压压力65 MPa。另外,通过CAE模流分析软件中PP薄壁制品注塑加工的翘曲变形进行仿真发现,正交试验所获得的优化工艺的总翘曲变形量为1.417 mm,翘曲变形百分比约为3.30%。其中由于冷却引起的翘曲变形量约为0.159 mm,而由收缩和取向引起的翘曲变形分别约为1.853 mm和0.904 mm。     

薄壁注塑成型技术

由于3C产品向“轻、薄、短、小”方向发展得越来越快,所以薄壁注塑成型技术也受到人们高度重视。介绍了薄壁注塑成型技术产生的背景及其优点,分析了薄壁注塑成型的定义,综述了薄壁注塑成型中的注塑机、模具设计、制品设计和材料选用,探讨了薄壁注塑成型中所面临的主要问题。     

Effect of process conditions on the dart impact properties of thin‐wall injection‐molded polycarbonate plates

Multifunctional mobile products, such as cellular phones, laptop computers, personal media players, etc., have become smaller and lighter; so the technology of thin‐wall injection molding (TWIM) has been highlighted for making lightweight and compact mobile electronic products. Regarding mechanical properties, many portable electronic products should pass the so‐called “drop test”; therefore, the evaluation of the dart (or impact) property of the housing that is made by the TWIM process is crucial for commercializing a product. However, extant research on the effect of injection molding process parameters on the physical properties of TWIM plates is insufficient as yet. Therefore, in this study, the pressure and temperature inside the cavity during the injection molding process are monitored by varying the injection molding process parameters, i.e., the gate size, injection speed, and melt temperature, and the effect of the average flow rate of the molten resin inside the cavity on the dart property of thin‐wall injection‐molded plates is examined. The dart property of thin‐wall injection‐molded plates is evaluated by the instrumented dart impact test to differentiate various responses of the load‐displacement data during dart tests. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci., 2013     

聚丙烯生产和工艺技术最新进展

介绍了国内外聚丙烯近期生产概况、技术进展、新产品开发成果以及市场的供需现状和发展趋势。进行了市场预测,目前世界聚丙烯产量约为3712～3790万t/a;2003年,中国聚丙烯产量达462 82万t/a,而市场需求量大约为700万t/a,供需差距仍然较大,有很大的发展空间。着重介绍了工艺技术和催化剂开发所取得的最新成果。     

Catalytic degradation of polypropylene I. Screening of catalysts

The catalytic degradation of polypropylene has been investigated in this study. Solid acid catalysts, such as silica-alumina and zeolites (HZSM-5, natural zeolite, Mordenite etc.), were screened for polypropylene degradation in the range of 350-450‡C. The degradation products of polypropylene, especially a liquid fraction, formed over solid acid catalysts, were analyzed by GC/MS. The degradation products are distributed in a narrow range of carbon number compared with those obtained by thermal degradation. The liquid fraction contained large amounts of iso-paraffins and aromatics as are present in the gasoline traction of petroleum. The natural zeolite catalyst (clinoptilolite structure, occurring in Youngil area of Korea) was an efficient catalyst for the polypropylene degradation. The acidity and characteristic pore structure of this zeolite appear to be responsible for the good performance. The effects of temperature and reaction tune on the product distribution have also been studied in this work.     

高熔体强度聚丙烯技术进展

高熔体强度聚丙烯(HMSPP)是聚丙烯改性的研究的重要产品之一。本文综述了高熔体强度聚丙烯的性能特点、制备方法、用途以及国内外研究和开发情况。     

超临界水降解聚丙烯的工艺研究

采用间歇式管式反应器进行了超临界水降解聚丙烯实验,研究了影响聚丙烯降解的因素。实验结果表明,在温度400－450℃、压力23－35MPa及反应时间60－120min的条件下,超临界水能有效地降解聚丙烯。反应温度和反应时间是影响聚丙烯降解的主要因素,温度越高、时间越长,聚丙烯降解越彻底;聚丙烯颗粒度越小降解速率越快,粉末原料在温度400℃、反应时间60min时,以油相产物为主;在温度450℃、反应时间120min时,有利于得到气相产物。     

Oxidative degradation of polyolefins. I. Thermal oxidative degradation of atactic polypropylene in solution

Atactic polypropylene was oxidized in solution with radical initiator in the absence and presence of metal catalyst to considerably high conversion over the temperature range of 70° to 125°C, and oxidation products and the change in molecular weight distribution were measured. The unoxidized polypropylene had no ultraviolet absorption at 253.7 nm, whereas the oxidized polypropylene showed distinct absorption over a wide range of molecular weights. It was found that oxygen was incorporated into the polymer chain as hydroperoxide, acid, carbonyl, and hydroxy groups. Much of the absorbed oxygen was found to be involved in smaller fraction of low molecular weight products. Although the average molecular weight of the oxidized polypropylene decreased significantly, the formation of low-boiling products was quite small.     

Polyethylen,polypropylen: Neue perspektiven für standardpolymere

Polyolefins like polyethylene (PE), polypropylene (PP) and their copolymers inclusive elastomers (EPM, EPDM) are materials with wide ranges of properties and excellent environmental compatibility. Therefore use and production of these products increase steadily. By the development of new catalysts and advanced technologies tailor-made products with new combinations of properties are available which open superior applications. To these products belong materials with Schúlz,Flory- or bimodal molecular mass distributions, new types of linear low density products with homogeneous comonomer distribution, multiphase polypropylene blends and long glass fibre reinforced polypropylene materials. With metallocenes new types of polyolefins can be synthesized like syndiotactic polypropylene and other polyolefins.     

吸酸剂对MTP均聚聚丙烯产品的影响

将煤基均聚聚丙烯基础树脂添加不同吸酸剂后,使用双螺杆挤出粒状样品,通过考察粒料样品的压力升值、灰分、拉伸性能、黄色指数、氧化诱导期等技术指标,研究了不同吸酸剂对煤基聚丙烯的影响。结果表明,使用硬脂酸钙作为吸酸剂,可以降低聚丙烯产品的灰分、黄色指数和压力升值,提高该产品的拉伸断裂强度,比水滑石作为吸酸剂更适用于拉丝级聚丙烯牌号产品的生产。     

国内煤制聚丙烯市场现状及应用研究

文章详细论述了国内煤（甲醇）制聚丙烯生产现状及未来几年国内煤（甲醇）制聚丙烯装置扩能情况.同时,文章在概述国内现有煤制聚丙烯装置生产牌号的基础上,重点分析了神华宁夏煤业集团生产的低融指均聚聚丙烯、低融指抗冲共聚聚丙烯、中融指均聚聚丙烯产品的市场应用情况及产品特点并对神华宁煤集团煤基聚丙烯产品未来发展趋势进行了展望.     

薄壁聚丙烯专用料的前景与开发

一次性餐盒因其使用方便快捷、价格便宜,全国消费量已达150亿只/年以上,市场前景广阔,其中聚丙烯一次性餐盒具有卫生环保、美观实用、性价比高等其他一次性餐盒无可比拟的优点,正逐渐取代其他材料的餐盒。因此,对薄壁聚丙烯专用料的需求也将越来越大,其用量目前在20万吨/年以上,产品利润较高,薄壁聚丙烯专用料的市场前景和经济效益良好。薄壁聚丙烯专用料的性能指标要求很高,可以在大型聚合生产装置通过氢调法、降解法和平衡法生产,也可以在小型生产装置通过加入降解剂和成核剂来生产。