全密度聚乙烯生产工艺进展及市场现状

综述了全密度聚乙烯(PE)的生产工艺,包括气相法的Unipol工艺,Innovene工艺,Spherilene工艺和Borealis工艺,溶液法的Sclair工艺和Dowlex工艺,淤浆法的Phillips环管工艺;分析了国内全密度PE的生产情况,以及2017年国内高密度聚乙烯、低密度聚乙烯、线型低密度聚乙烯的进出口情况,指出国内PE的月度进口量均远大于出口量,开发能够替代进口PE的高端产品有很大空间;最后,对国内全密度PE的发展前景进行了预测。     

中国石油气相法聚乙烯中试装置投入运转

<正> 我国聚乙烯催化剂国产化迈出重要一步。截至2010年7月8日,中国石油石油化工研究院建设的国内最大气相法全密度聚乙烯中试装置已生产聚乙烯产品400 kt。首批产品主要用来进行后期的实验研究,为开发聚乙烯新产品和专用料奠定基础。该中试装置的建成和投运,对于我国开发自主气相法和淤浆法聚乙烯工艺,推动聚乙烯行业技术进步具有重要意义。总投资近亿元的聚乙烯催化剂与工艺工程中试     

全密度聚乙烯生产工艺现状探析

聚乙烯的应用在当前时期的发展速度日益加快,为了充分应对我国各行业对于聚乙烯的应用需求,同时提升我国聚乙烯生产在国际上的竞争力,近年来,我国研究人员逐步加强了对于聚乙烯的研究,尤其是加强了对于全密度的聚乙烯的重视。本文便是以全密度的聚乙烯作为主题,着重探讨了目前开展进行全密度的聚乙烯生产工作所应用的工艺状况。     

Unipol低压气相法聚乙烯合成工艺进展

本文叙述了美国联合碳化物公司Unipol低压气相法聚乙烯工艺流程、工艺技术特点、所用催化剂的体系及近期进展情况,并介绍了该工艺从生产全密度的聚乙烯到生产VLDPE、PP、乙丙橡胶及挠性聚合物的发展过程中,在工艺流程、操作方法等方面进行的系列改进,以及Unipol聚乙烯工艺在我国的现状。     

聚乙烯生产过程中先进过程控制技术最新研究进展

先进控制方法与集散控制系统结合,对于全流程优化聚乙烯工艺及装置运行参数、提高产品质量、降低装置能耗、降低物料消耗、降低牌号切换时间及过渡料的量,发挥着几乎无可替代的作用。从先进过程控制方法,先进过程控制在低密度、高密度、全密度聚乙烯工艺,多功能监控方法,装置停车方法及调温水控制等方面综述了聚乙烯工艺先进过程控制技术的最新研究进展。     

高强度薄膜专用HDPE的生产

在全密度聚乙烯装置上采用Unipol气相法工艺,以1-丁烯为共聚单体生产高强度薄膜专用高密度聚乙烯(HDPE)DGDB6097。DGDB6097的熔体流动速率(负荷21.6 kg)为7.00~13.00 g/10 min,密度为0.945~0.951g/cm3,拉伸屈服应力大于或等于19 MPa,拉伸断裂应力大于或等于23 MPa,断裂标称应变大于或等于500%。与相同工艺生产的普通薄膜专用线型低密度聚乙烯相比,DGDB6097的密度高、拉伸强度大;与国内市场常见的高强度薄膜专用HDPE DGDA6098相比,DGDB6097的力学性能、结晶性能、相对分子质量及其分布以及其薄膜的各项性能相当。加工应用表明,DGDB6097的加工性能和薄膜力学性能均满足用户要求。     

茂名石化成功试产柔性CPE包装薄膜料

正近日,茂名石化在化工分部全密度装置上用流延法成功试产出柔性聚乙烯包装薄膜PE-LF234PB合格料565吨,增效超10万元。据悉,聚乙烯薄膜的传统加工方法主要有吹塑和流延两种工艺,流延聚乙烯(CPE)包装薄膜具有透明性好、光泽度高、热封温度低、柔性好、耐寒抗冷冻,可以在极寒的环境中使用,且外观远胜于吹塑聚乙烯(IPE)薄膜,市场     

引进工艺条件的优化与PE产品的结构性能

分析了中国石油天然气股份有限公司兰州石化分公司(简称兰州石化)低密度聚乙烯和全密度聚乙烯装置产品的结构和性能, 并与国内外同类产品比较.结果表明, 优化工艺条件后兰州石化生产的2426H, 1810D,DMDA8008, DFDA7042等产品性能稳定,可满足不同行业的加工要求.     

茂金属催化剂实现工业化应用

中国石油石油化工研究院茂金属催化剂在聚乙烯中试基地连续运转276 h,超计划运行36 h,生产出6.5 t产品,产品熔融指数(2.0±0.2)g·(10min)-1,密度为0.918 g·cm-3,催化剂活性为8 200 kg-聚乙烯·(kg-催化剂)-1。气相法全密度聚乙烯产品指标和装置运行指标均达到开工要求。中试装置的长周期     

大庆石化公司塑料厂

大庆石化公司塑料厂是中国石油天然气股份有限公司大规模、品种齐全的聚乙烯生产厂之一。共有六套生产装置,年设计聚乙烯生产能力113万吨,产品牌号达141个。有6.5万吨/年、20万吨/年高压管式法低密度聚乙烯装置各一套、22万吨/年淤浆法高密度聚乙烯装置一套(三条生产线)、7.8万吨/年气相法线性低密度聚乙烯装置一套、25万吨全密度聚乙烯装置一套和30万吨全密度聚乙烯装置一套。全厂现有员工1540人,12个车间,9个科室,1个材料供应站。自1986年6月建成投产以来,全厂员工团结一致,奋力拼搏,锐意进取,加强精细化管理,聚乙烯产量连续跨上三个新台阶。截至2013年12月末,累计生产聚乙烯产品10195343吨。在市场竞争日趋激烈的形势下,塑料厂视质量为企业生命,大力实施品牌战略,不断优化生产方案,开发新品种,严格把好产     

当今世界聚烯烃工业的重点技术

叙述和分析了９０年代以来世界聚烯烃工业的重点技术，包括高效催化剂技术，无溶剂聚合技术，气相流化床聚乙烯工艺的冷凝态进料技术，共聚技术，生产分子量双峰分布聚乙烯树脂技术以及不造粒技术。     

Linear low-density polyethylene/high-density polyethylene blends: Effect of high-density polyethylene content on die swell and flow instability

This work aimed to evaluate the effect of high-density polyethylene (HDPE) content and of shear rate on the die swell and flow instability of linear low-density polyethylene (LLDPE)/HDPE blends. The results showed that the die swell of the LLDPE/HDPE blends increased with the increase in the shear rate. At high shear rates, the increase in the HDPE content led to an increase in the die swell of LLDPE/HDPE blends. The surface morphology analysis of the extrudates by optical and scanning electron microscopy revealed the presence of sharkskin and stick–slip flow instabilities in LLDPE and LLDPE/HDPE blends at the shear rates investigated. These instabilities were attenuated with the addition of HDPE and almost disappeared in the LLDPE/HDPE blend containing 50 wt% of HDPE.     

硅烷接枝交联HDPE、LLDPE及其共混物的结构研究

利用红外光谱、差示扫描量热法等方法研究了高密度聚乙烯(HDPE)、线性低密度聚乙烯(LLDPE)及其共混物的乙烯基三乙氧基硅烷(VTEOS)接枝及交联产物的分子结构、熔融行为。结果表明,VTEOS接枝交联PE能力为:LLDPE>HDPE/LLDPE共混物>HDPE;接枝和交联使HDPE、LLDPE及其共混物的结晶度和熔点降低,晶粒变得不均匀。     

粘接性树脂在PTC自限温伴热带中应用

研究了以乙炔炭黑为导电粒子,ＨＤＰＥ、ＬＬＤＰＥ及粘接性树脂（接枝高密度聚乙烯（ｇ ＨＤＰＥ））为基体的导电复合物ＰＴＣ行为,电致发热特性及电压循环冲击试验。结果发现,ｇ ＨＤＰＥ／ＣＢ导电复合材料、ＬＬＤＰＥ／ｇ ＨＤＰＥ／ＣＢ复合物的ＰＴＣ复演性及电阻稳定性均优于ＬＬＤＰＥ／ＣＢ及ＨＤＰＥ／ＣＢ导电体系     

Rheological and mechanical properties in polyethylene blends

Melt rheology and mechanical properties in linear low density polyethylene (LLDPE)/low density polyethylene (LDPE), LLDPE/high density polyethylene (HDPE), and HDPE/LDPE blends were investigated. All three blends were miscible in the melt, but the LLDPE/LDPE and HDPE/LDPE blends exibiled two crystallization and melting temperatures, indicating that those blends phase separated upon cooling from the melt. The melt strength of the blends increased with increasing molecular weight of the LDPE that was used. The mechanical properties of the LLDPE/LDPE blend were higher than claculated from a simple rule of mixtures, whiele those of the LLDPE/HDPE blend conformed to the rule of mixtures, but the properties of HDPE/LDPE were less than the rule of mixtures prediction.     

HDPE/LLDPE/POE薄膜性能的研究

采用线型低密度聚乙烯（LLDPE）和热塑性弹性体乙烯-辛烯共聚物（POE）对高密度聚乙烯（HDPE）薄膜进行改性,研究了LLDPE和POE对共混体系薄膜力学性能、加工性能的影响,探讨了LLDPE增强HDPE的机理。结果表明,加入一定量LLDPE,使HDPE／LLDPE薄膜的拉伸强度较纯HDPE薄膜有所增加,而单位冲击破损质量则有所下降。当w（LLDPE）为15％时,HDPE／LLDPE薄膜的拉伸强度提高21．6％,薄膜的单位冲击破损质量降低23．0％。在HDPE／LLDPE/POE三元体系中,当w（POE）,w（LLDPE）分别为10％,15％时,薄膜的拉伸强度、单位冲击破损质量、断裂伸长率比纯HDPE薄膜分别提高2．3％,113％。36．0％,综合性能良好。     

Formation mechanism of crystal morphologies in LLDPE/HDPE blends investigated via water‐assisted and conventional injection molding

The LLDPE/HDPE blends with two different weight ratios as well as pure LLDPE were molded by means of water‐assisted and conventional injection molding (WAIM and CIM) in terms of their different thermal fields. The formation of the crystal morphology in the molded parts was investigated by a scanning electron microscope. The results showed that banded spherulites formed in the WAIM and CIM pure LLDPE parts. Banded spherulites of LLDPE coexisted with the randomly oriented lamellae of HDPE for LLDPE/HDPE blend parts with lower HDPE content at higher cooling rates, whereas a banding to nonbanding morphological transition occurred for LLDPE component (particularly for blend with higher HDPE content) at lower cooling rates. The heterogeneous nucleation effect of HDPE component on LLDPE component was responsible for the banding to nonbanding morphological transition by hindering the twist of LLDPE lamellae. It was interesting to find that the thermal effect, rather than the shear effect, was the main factor for the formation of crystal morphologies in both CIM and WAIM blend parts. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers     

喷雾干燥条件对浆液催化剂性能的影响

浆液催化剂是LLDPE/HDPE装置使用的主要催化剂,而喷雾干燥是有效控制浆液型催化剂形态及性能的一种技术。本文详细考察了喷雾干燥条件对浆液型催化剂性能的影响,并给出最佳工艺条件。     

Effects of different compatibilizers on the rheological,thermomechanical, and morphological properties of HDPE/LLDPE blend‐based nanocomposites

The influence of two different compatibilizers and their combination (maleic anhydride grafted high density polyethylene, HDPE‐g‐MA; maleic anhydride grafted linear low density polyethylene, LLDPE‐g‐MA; and 50/50 wt % mixture of these compatibilizers) on the rheological, thermomechanical, and morphological properties of HDPE/LLDPE/organoclay blend‐based nanocomposites was evaluated. Nanocomposites were obtained by melt‐intercalation in a torque rheometer in two steps. Masterbatches (compatibilizer/nanoclay 2:1) were obtained and subsequently diluted in the HDPE/LLDPE matrix producing nanocomposites with 2.5 wt % of nanoclay. Wide angle X‐ray diffraction (WAXD), steady‐state rheological properties, and transmission electron microscopy (TEM) were used to determine the influence of different compatibilizer systems on intercalation and/or exfoliation process which occurs preferentially in the amorphous phase, and thermomechanical properties. The LLDPE‐g‐MA with a high melt index (and consequently low viscosity and crystallinity) was an effective compatibilizer for this system. Furthermore, the compatibilized nanocomposites with LLDPE‐g‐MA or mixture of HDPE‐g‐MA and LLDPE‐g‐MA exhibited better nanoclay's dispersion and distribution with stronger interactions between the matrix and the nanoclay. These results indicated that the addition of maleic anhydride grafted polyethylene facilitates both, the exfoliation and/or intercalation of the clays and its adhesion to HDPE/LLDPE blend. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1726–1735, 2013     

HDPE/LLDPE/OMMT纳米复合材料的结构与性能

采用直接注射法制备HDPE/LLDPE/OMMT纳米复合材料,采用透射电子显微镜研究 HDPE/LLDPE/0MMT纳米复合材料的微观结构,研究有机蒙脱土含量对纳米复合材料性能的影响.透射电子显微镜结果显示,制备的HDPE/LLDPE/OMMT纳米复合材料是一种半剥离型的纳米复合材料.结果表明:蒙脱土的加入大大提高了纳米复合材料的力学性能和热变形温度.当有机蒙脱土质量含量仅为6%时,屈服强度和拉伸模量分别提高14.0%和59.7%,弯曲强度和弯曲模量分别提高了14.2%和60.O%.