独石化高性能PE100管材专用料成功试产

正独山子石化开发的高耐慢速裂纹增长性能聚乙烯PE100(简称PE100-RC)管材专用料成功试产,产品分子结构特性与进口料基本相当,标志着我国石油PE管材料家族又添新成员。独山子石化公司研究院和乙烯厂结合PE100-RC管材料标准要求,通过典型市售料结构剖析、分子量分布设计、聚合原料配方调整、结构—工艺关联性控制,最终成功试生产     

进口PE100级管材料的剖析

通过核磁共振谱、差示扫描量热、力学性能、凝胶渗透色谱和流变仪等分析手段，研究了进口．PE100级和国产高密度聚乙烯(HDPE)管材料级牌号的结构特征。结果表明，进口PE100级管材料主要是1-丁烯共聚的HDPE，其冲击强度大于国产管材料的两倍，氧化诱导期长。     

中国石油聚烯烃重大专项通过验收

正近日,独山子石化公司研究院承担集团公司科技部聚烯烃重大专项在北京通过专题验收,在北京片区验收的7个专项课题中,由独山子石化公司作为牵头单位承担的"燃气管专用料的开发"专题得分第一。2010年以来,独山子石化公司相继成功开发PE100级管材料TUB121N3000及其混配料TUB121N3000B,大口径PE100级管材料UHXP4808及其混配料UHXP-     

优化产品结构生产双峰管材新品

3月21日吉化大乙烯高密度聚乙烯装置经过第五次牌号切换，成功生产出高密度聚乙烯PE100管材料JHMGC100S，该产品填补了中石油公司产品的一项空白，为公司创造了巨大的经济效益。     

吉林石化7项科研成果通过验收

吉林石化公司自主研发的双峰分布ABS乳液接枝技术、异戊橡胶生产技术开发、PE100管材料技术消化吸收、应用技术研究及市场开发等7项科研成果,陆续通过专家鉴定验收。     

管材专用料HDPE4902T加工性能的研究

在对管材专用料HDPE 4902T的性能测试和结构表征的基础上,研究了加工温度和挤出速度对挤出参数的影响情况,并对管材的性能进行了测试。结果表明,HDPE 4902T具有双峰分布聚乙烯树脂的特点,性能满足PE100级管材料的指标要求。材料的流变特性对温度变化的敏感性较弱。挤出温度和速度对管材的性能影响很小,采用该管材专用料,可以在较宽的温度和速度范围内制备出性能优良的管材。     

齐鲁公司推出PE100级管材专用料

齐鲁公司日前在高密度聚乙烯聚合反应器生产出PE100级管材专用料，并形成了工业化生产规模。这种专用料是国内首家获得外推100年认证，达到UPE100等级的管材料，即在一定条件下，预测其使用寿命可达100年。     

传统挤出聚乙烯管的多层次结构及应用中的薄弱点

利用多种表征方法,系统地研究了3种管径PE管的多层次结构。结果表明:聚合物熔体在挤管过程中受到轴向挤出/牵引作用,分子链易沿轴向取向,而沿厚度方向存在的温度梯度也使片晶沿径向取向排列。对小口径PE管而言,管壁厚度较薄,这2种取向更加明显。XRD和DSC实验表明:管径变化对PE管晶体结构影响不大,但由于外壁快速喷淋冷却,内壁冷却速度较慢,形成的片晶厚度较大,tie分子链含量较低。     

博禄和北欧化工聚乙烯材料列入PE100+名录

<正>博禄和北欧化工高抗应力开裂(HSCR)PE100聚乙烯材料BorSafe HE3490-LS-H近期被列入PE100+协会优质材料名录。凭借PE100聚乙烯材料的高性能和特性,可将其管道作为一种可靠和无需维护的基础设施应用于之后的许多年中。     

国外动态

高压管件用PE树脂荷兰的Borealis AS公司开发出特殊品级的PE树脂,可供PE100型压力管件的注射成型。牌号为Borstar HE3490-IM的新品树脂不仅具有PE100材料的耐高压性能,同时具有PE80材料的加工性能。此外,同传统的挤出级PE100比较,Borstar HE3490-IM品级具有低温注射成型的特点,     

燃气管用PE100级混配料的热分解动力学和机理

采用热重分析法测定了在氮气气氛中2、5、10、20 ℃/min 4种不同升温速率下的燃气用PE100级混配料热分解过程。采用Kissinger法、Flynn-Wall-Ozawa方法和Coats-Redfern法考察了燃气用PE100级混配料热分解动力学和机理。运用Toop法对PE100级混配料在不同温度下的寿命进行了评估。结果表明，PE100级混配料的热失重为一步分解反应；Kissinger 法求得热分解平均活化能（E）为327.8 kJ/mol，Flynn-Wall-Ozawa法求得的E为304.6 kJ/mol，表观指前因子（lnA）值为53.9 min^-1；在12种常见热分解模型中，R2即圆柱对称的收缩机制最适合描述PE100级混配料热分解反应过程；50 ℃下，Kissinger 法和Flynn-Wall-Ozawa法求得的PE100级混配料寿命分别为7.4×10⁸年和7.9×10⁷年，随着温度的升高，寿命急速降低。     

Use of the lower critical solution temperature for the characterization of polymer mixtures and the study of their compatibility: Application to polyethylenes,polypropylene, and their copolymers

The Lower Critical Solution Temperature (LCST) of polyethylene (PE), polypropylene (PP), and ethylene-propylene block and random copolymers have been measured in heptanes. A thermogram related to the variation of the turbidity of the solution is obtained between 100 and 210°C. The temperature of the onset of the turbidity peak is defined as the LCST of the system. The width and the area of the turbidity peaks are tentatively associated with the polymer polydispersity and the amount of polymer involved in the phase separation. The thermograms of solutions containing both homopolymers show two distinct turbidity peaks situated at a 70°C interval. Correlations of molecular orientations in the concentrated phase, possible in PE systems but not in PP solutions, are at the origin of the lower LCST values for PE solutions. The LCST of copolymers are situated between those of the homopolymers but the dependence of the LCST on the copolymer ethylene content is different for block and random copolymers. Examples of thermograms are also given for mixtures of copolymers with PE and PP. By analysis of their thermograms, some commercial block EP copolymers were also found to contain PK and PP. This method seems well suited for characterizing polymer mixtures.     

聚乙烯管材SCG性能评价及寿命预测论述

管材的慢速裂纹萌生和扩展至管材破坏的时间是评价管材使用性能的一项重要指标。随着原材料性能的提高,聚乙烯(PE)管材抗裂纹萌生和耐慢速裂纹扩展的能力大幅提高。优异的PE100 RC管材在FNCT、PENT等实验评价方法下,测评时间均超过15000 h。PE管慢速裂纹评价方法普遍存在实验条件复杂、重复性差等问题,严重制约了PE管材的开发进程。对此,国外学者提出了更简洁快速的评价方法——循环载荷缺口圆棒(CRB)法。文章着重论述了,循环载荷CRB法对管材SCG性能及管材寿命预测的评价,同时,论述了几种管材性能评价方法的相关性。最后,指出了循环载荷CRB方法后续用作其他塑料管评价的研究方向。     

Structural and rheological investigation of interphase in polyethylene/polyamide/nanoclay ternary blends

This study aims at investigating and characterizing the interphase in Polyethylene (PE)/Polyamide (PA) blends with nodular morphology, filled with organically modified Montmorillonite (C30B), using structural and rheological experimental techniques. PE/PA/C30B blends have been prepared by simultaneous mixing at a dispersed phase fraction (PE or PA) of 20% and a clay fraction ranging from 1 to 6%. Structural properties of the interphase have been investigated using XRD combined with TEM micrographs. The presence of numerous interphase defects is evidenced, and the effect of interphase disorder is discussed. Linear viscoelastic properties show the contribution of the interphase in PE matrix ternary blends at all clay fractions, whereas interphase effects are masked by the contribution of dispersed nanoclay particles in PA matrix ternary blends.     

DSC技术在PE100树脂分析中的应用

采用差示扫描量热法（DSC）研究了低聚物对高密度聚乙烯管材PE100热性能的影响,并且对比分析了5种国内外树脂的热行为。结果表明,通过改变树脂中低聚物配比的方法可以控制树脂的结晶行为。当等温结晶温度升高时,树脂的DSC热分级曲线的低温熔融峰面积和高温熔融峰面积的比例会发生变化。国外进口树脂的低温熔融峰面积相对较低。     

PE压力管道专用树脂的性能及我国研发状况

介绍了我国石化企业近年来压力管道专用树脂的研发生产状况,以及相关标准对聚乙烯(PE)压力管道树脂的要求。我国已有7家石化企业生产的PE压力管道专用树脂通过了PE 80级或PE 100级认证。随着我国石化企业对高等级管道专用树脂的开发,逐步改变了我国PE 100级管道专用树脂长期依赖进口的局面。     

Factor XIII and Fibrin Clot Properties in Acute Venous Thromboembolism

Coagulation factor XIII (FXIII) is converted by thrombin into its active form, FXIIIa, which crosslinks fibrin fibers, rendering clots more stable and resistant to degradation. FXIII affects fibrin clot structure and function leading to a more prothrombotic phenotype with denser networks, characterizing patients at risk of venous thromboembolism (VTE). Mechanisms regulating FXIII activation and its impact on fibrin structure in patients with acute VTE encompassing pulmonary embolism (PE) or deep vein thrombosis (DVT) are poorly elucidated. Reduced circulating FXIII levels in acute PE were reported over 20 years ago. Similar observations indicating decreased FXIII plasma activity and antigen levels have been made in acute PE and DVT with their subsequent increase after several weeks since the index event. Plasma fibrin clot proteome analysis confirms that clot-bound FXIII amounts associated with plasma FXIII activity are decreased in acute VTE. Reduced FXIII activity has been associated with impaired clot permeability and hypofibrinolysis in acute PE. The current review presents available studies on the role of FXIII in the modulation of fibrin clot properties during acute PE or DVT and following these events. Better understanding of FXIII’s involvement in the pathophysiology of acute VTE might help to improve current therapeutic strategies in patients with acute VTE.     

燃气管材用聚乙烯专用料的应用发展

回顾了塑料管道在燃气输配领域的应用发展,简要介绍聚烯烃的催化关键制备技术的发展历程;比较了国内燃气用埋地聚乙烯（PE）管材制造国家标准(GB 15558.1)2015版和2003版对PE混配料的性能要求变化;分析比较了国际标准ISO 4437和欧洲标准EN 1555的对燃气管PE专用料的性能要求。重点阐述了PE80、PE100、PE 100RC的高性能特点及发展过程,提出了开发PE125的建议。     

快速区分PE100和PE80管材的方法

利用简单仪器,在相同温度下,分别对PE100和PE80试样施加相同的压缩应力,使试样在短时间内产生明显变形,并在此基础上改变试验温度,从而确定最佳试验温度和时间以及分界压缩变形率,最终找到一种快速区分PE100和PE80管材的方法。     

聚乙烯管道系统的连接技术问题(1)

介绍了各种聚乙烯管道系统的连接技术。连接常是管道系统成败的关键,各种连接技术都有其适用的范围。聚乙烯压力管道的连接以熔接为主,但有些场合需要机械密封连接。在聚乙烯的机械密封连接中特别要注意聚乙烯容易蠕变的特性。有些适用于聚氯乙烯管道的连接方法和设计不适用于聚乙烯管道。聚乙烯无压力管道的连接也有多种方法,要根据对于密封的要求选择。介绍了国内外为解决聚乙烯双壁波纹管承口刚度问题采用的种种做法。简介了交联聚乙烯管道和增强聚乙烯管道的特殊连接技术。提出在聚乙烯管道系统的连接方面希望国内外科技界关注的几个重要研究课题。