辽化HDPE装置浆液化循环技术改造后釜内的聚合过程分析

通过对辽阳石油化纤公司高密度聚乙烯淤浆聚合装置外循环撤热技术改造前后生产ＧＦ７７５０Ｍ牌号产品时聚合过程的工程分析，发现了釜内聚合过程特征的变化，提出了聚乙烯蜡含量的明显上升是引起聚合物粘壁加剧的最直接原因，并通过分析得出了可能导致聚乙烯蜡含量上升的主要因素以及进一步提高装置生产能力的可能性和主要手段。     

熔融法聚乙烯蜡接枝马来酸酐的研究

研究了熔融法聚乙烯蜡接枝马来酸酐的工艺过程和影响反应的主要因素。以丙酮为溶剂，将MAH和聚合引发剂配成溶液滴加反应，引发剂和MAH的质量分数各为12％，反应温度165℃左右，接枝率可达15．6％。经红外谱图分析证明聚乙烯蜡与马来酸酐发生了接枝反应。在热熔胶的制备中，发现使用接枝聚乙烯蜡比使用未接枝聚乙烯蜡的粘接强度(PVC／木材)提高了约90％。     

淤浆聚乙烯催化剂在高韧性膜料生产中的应用研究

采用Ziegler-Natta催化剂（JCES-200催化剂）用于Hostalen聚合工艺高密度聚乙烯装置,生产聚乙烯高韧性膜料HM 9455F1。生产结果表明,JCES-200催化剂的活性比装置常用催化剂（Ref催化剂）高约77%。JCES-200催化剂的氢调性能略好于Ref催化剂,JCES-200催化剂的共聚性能比Ref催化高约8%。JCES-200催化剂生产的聚合物分布更加集中,且150um以下细粉含量少于原催化剂生产的细粉含量。JCES-200催化剂生产过程中干燥系统运行良好,且产生的蜡含量较低有利于装置长周期运行。JCES-200催化剂生产的膜料HM 9455F1产品质量优异。     

聚乙烯蜡制备装置及工艺研究进展

综述了聚乙烯蜡的性能及其制备方法和生产装置的研究进展,具体概括了聚乙烯蜡的性能表征,阐述了国内外制备聚乙烯蜡产品工艺的研究现状,主要包括聚合工艺及热裂解和催化裂解等工艺;并叙述了反应釜、管式、挤出机等现有生产装置,提出了今后聚乙烯蜡制备技术和研究的发展方向。     

聚乙烯蜡超细粉的生产工艺和应用

对物料进行超细化处理 ,使其物理化学性能发生许多特殊的变化 ,这一高新技术正日益受到重视 ,有着广阔的应用前景。通过对聚乙烯蜡超细粉生产工艺的比较 ,确定冷冻喷雾粉化生产工艺是最好的。利用现有的氧化聚乙烯装置 ,建成 30 0t/a聚乙烯蜡超细粉生产装置。介绍了此产品的生产工艺过程 ,以及其作为添加剂使油墨和涂料的性能得到提高 ,用途更加广泛     

宽峰高相对分子质量高密度聚乙烯专用料的研制

通过淤浆法小试聚合装置合成了不同相对分子质量的高密度聚乙烯粉末,对聚合工艺条件对产物物性的影响进行了研究。同时,考察了不同相对分子质量的聚乙烯共混合成宽峰聚乙烯专用料的规律。结果表明:通过调整聚合工艺条件,在淤浆法小试聚合装置聚合产物的相对分子质量可调;不同相对分子质量的聚乙烯粉末共混可以制备宽峰HDPE;合成的宽峰HDPE专用料的综合力学性能优良,在树脂研究院进行加工,性能良好。     

宽峰高相对分子质量高密度聚乙烯专用料的研制

通过淤浆法小试聚合装置合成了不同相对分子质量的高密度聚乙烯粉末,对聚合工艺条件对产物物性的影响进行了研究.同时.考察了不同相对分子质量的聚乙烯共混合成宽峰聚乙烯专用料的规律.结果表明:通过调整聚合工艺条件.在淤浆法小试聚合装置聚合产物的相对分子质量可调;不同相对分子质量的聚乙烯粉末共混可以制备宽峰HDPE:合成的宽峰HDPE专用料的综合力学性能优良,在树脂研究院进行加工,性能良好.     

聚乙烯蜡的研究进展与工业生产方法探讨

在处理废旧塑料时可以利用热裂解或者催化裂解获得聚乙烯蜡.聚乙烯蜡作为具有广泛应用前景的有机中间体,可以应用于各种领域.综合概括了聚乙烯蜡的研究进展,并介绍了自主设计的一套得到分子量为1200～1500的聚乙烯蜡产品生产装置.     

高压聚乙烯装置反应器黏壁的原因与处理措施

高压聚乙烯装置的生产过程中一般是采用高压管式压缩的方式在反应器中进行聚合应用,在应用过程中会产生黏壁现象,不利于装置的进一步应用工作,影响生产系统的有序运行,本文首先对高压聚乙烯装置应用简要概述;其次,对高压聚乙烯装置反应器黏壁原因综合分析,最后,本文针对高压聚乙烯装置反应器处理预防对策提出合理性建议。     

双峰高密度聚乙烯树脂的开发前景

HDPE装置采用淤浆法生产高密度聚乙烯,描述了双峰高密度聚乙烯树脂的特点,介绍了双峰HDPE产品物性参数、聚合工艺和质量指标,概括了影响双峰高密度聚乙烯树脂物理性质的三个主要因素(聚合方式、所用共聚单体、所用稳定剂),阐述了双峰高密度聚乙烯树脂的研制开发前景。     

含氟弹性体/聚乙烯蜡复合润滑剂对HDPE流变性能的影响

为了改善高密度聚乙烯(HDPE)熔体的流动不稳定性,在HDPE中添加了不同份数的含氟弹性体/聚乙烯蜡复合润滑剂。试验结果表明:在HDPE5000S加入0.125份含氟弹性体/5份聚乙烯蜡复合润滑剂,熔体不稳定流动现象在低剪切速率下明显改善。     

不同润滑剂对HDPE流变性能的影响

利用RH2200恒速型毛细管流变仪考察了硬脂酸镧复合物（RC）分别和聚乙烯蜡共混前后对高密度聚乙烯（HDPE）挤出性能的影响。与纯HDPE5000S相比，加入1．5份RC和1．0份或3．0份聚乙烯蜡混合物以后，熔体的表观粘度降低，发生压力振荡时候的滑移长度减少以及信号强度明显消失。     

淤浆法HDPE装置浆液外循环改造分析

对扬子石油化工股份有限公司塑料厂高密度聚乙烯（HDPE）装置利用浆液外循环技术实现增产扩容的可行性进行了分析。基于对乙烯聚合动力学、反应器内物料流动状态与气液传质速率等规律的分析，认为撤除聚合釜中的聚合反应热是增产扩容的技术关键。经核算，在保持原有设备撤热能力的基础上，增设一台外置式浆液冷却器，可使提高产能所增加的反应热由浆液冷却器撤除。本文提出的聚合釜浆液外循环改造的原则和改造方案，可为扬子石化HDPE装置的增产扩容提供技术支持。     

Synergistic compatibilization and reinforcement of HDPE/wood flour composites

Multi‐monomer grafted copolymers, high‐density polyethylene‐grafted‐maleic anhydride‐styrene (HDPE‐g‐(MAH‐St)) and polyethylene wax‐grafted‐ maleic anhydride ((PE wax)‐g‐MAH), were synthesized and applied to prepare high‐performance high‐density polyethylene (HDPE)/wood flour (WF) composites. Interfacial synergistic compatibilization was studied via the coordinated blending of high‐density polyethylene‐grafted‐maleic anhydride (MPE‐St) and polyethylene wax‐grafted‐ maleic anhydride (MPW) in the high‐density polyethylene (HDPE)/wood flour (WF) composites. Scanning electron microscopy (SEM) morphology and three‐dimensional WF sketch presented that strong interactive interface between HDPE and WF, formed by MPE‐St with high graft degree of maleic anhydride (MAH) together with the permeating effect of MPW with a low molecular weight. Experimental results demonstrated that HDPE/WF composites compatibilized by MPE‐St/MPW compounds showed significant improvement in mechanical properties, rheological properties, and water resistance than those compatibilized by MPE, MPE‐St or MPW separately and the uncompatibilized composites. The mass ratio of MPE‐St/MPW for optimizing the HDPE/WF composites was 5:1. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 42958.     

HDPE-g-MAH增容HDPE/木粉复合材料润滑剂的优选和热性能研究

使用自制HDPE-g-MAH做增容剂,通过双螺杆挤出机熔融共混制备了四种不同润滑剂的HDPE/木粉复合材料,对样品进行了力学性能测试；采用差示扫描量热分析(DSC)和热变形温度曲线测试考察了木粉和相容剂的加入分别对复合材料热、力学性能的影响。结果表明,润滑剂的种类和用量对HDPE/木塑复合材料的力学性能有较大的影响：与其它润滑剂相比,聚乙烯蜡具有更好的润滑作用和分散作用；DSC测试显示,木粉的加人提高了聚乙烯基体结晶度,相容剂使木粉的界面得到明显的改善,有利于聚乙烯的结晶；热变形温度曲线对比表明,木塑复合材料的热变形温度较聚乙烯有了很大的提高,有着更好的耐热性能。     

Investigation of thickness and wax content of wax deposits in polyethylene pipe using a flow loop

In this study, the thickness and wax content of wax deposits were found to be thinner and lower in the polyethylene (PE) pipe than in the stainless steel (SS) pipe using a flow loop apparatus. The diffusivity of wax, radial thermal gradient, and wax precipitation rate in the PE and SS pipes were calculated and compared. It was found the diffusivity of wax in the PE pipe was higher and tended to enhance the wax deposition in the PE pipe, while the radial thermal gradient and wax precipitation rate were lower in the PE pipe and had the opposite effects. These factors are shown to be comparable with each other and the effect of the thermal gradient dominates the mass flux of wax from bulk to the oil-deposit interface and into the deposits finally, thus causing differences in thickness and wax content of deposits between the PE and SS pipes.     

Structure and properties of phase change materials based on HDPE,soft Fischer‐Tropsch paraffin wax,and wood flour

Phase‐change materials based on high density polyethylene (HDPE), soft Fischer‐Tropsch paraffin wax (M3), and alkali‐treated wood flour (WF) were investigated. The blend and composite samples were prepared by melt mixing using a Brabender Plastograph, followed by melt pressing. They were characterized in terms of their morphology, as well as thermal, mechanical, thermo‐mechanical, and water absorption properties. Although SEM micrographs showed some evidence of intimate contact between the WF particles and the HDPE matrix as a result of alkali treatment, poor filler dispersion, and interfacial adhesion were also observed. Partial immiscibility of the HDPE and the M3 wax was noticed, with the WF particles covered by wax. There was plasticization of the HDPE matrix by the wax, as well as partial cocrystallization, inhomogeneity and uneven wax dispersion in the polymer matrix. The HDPE/WF/M3 wax composites were more homogeneous than the blends. The presence of wax reduced the thermal stability of the blends and composites. Both the presence of M3 wax and WF influenced the viscoelastic behavior of HDPE. The HDPE/M3 wax blends showed an increase in the interfacial amorphous content as the wax content increases, which resulted in the appearance of a β‐relaxation peak. The presence of M3 wax in HDPE reduced the mechanical properties of the blends. For the composites these properties varied with WF content. An increase in wax content resulted to a decrease in water uptake by the composites, probably because the wax covered the WF particles and penetrated the pores in these particles. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Structure and properties of phase‐change materials based on high‐density polyethylene,hard Fischer–Tropsch paraffin wax,and wood flour

Phase‐change materials based on high‐density polyethylene (HDPE), a hard Fischer–Tropsch paraffin wax (H1 wax), and alkali‐treated wood flour (WF) were investigated. The blends and composites were prepared by melt‐mixing. They were characterized in terms of their morphology as well as thermal, mechanical, thermomechanical, and water absorption properties. Although the scanning electron microscopy micrographs showed some evidence of intimate contact between WF and the HDPE matrix, there were poor filler dispersion and interfacial adhesion. The percentage miscibility of H1 wax in HDPE seems to have decreased with increasing wax content in the blends. A fairly strong affinity between the WF and H1 wax was noticed. There was plasticization of the HDPE matrix by the wax as well as inhomogeneity and uneven wax dispersion within the polymer matrix. The presence of H1 wax and WF influenced the crystallization behavior of the HDPE matrix. The incorporation of wax reduced the thermal stability of the blends and composites, but stabilized the WF. The H1 wax and WF differently influenced the viscoelastic properties of the HDPE matrix. In contrast to the blends where the tensile properties improved in the presence of wax, the composites showed poorer properties. An increase in wax content resulted in a decrease in water uptake by the composites. POLYM. COMPOS., © 2011 Society of Plastics Engineers.     

Melt transcrystallization of polyethylene on high modulus polyethylene fibers

A polytheylene composite was prepared and tested. It was consisted of a high-density polyethylene (HDPE) matrix and uniaxial gel-spun high-modulus PE fiber. Aided by the similarity between matrix and fiber, transcrystallization of HDPE melt on the PE fiber surface was generated. Nucleating agents were not employed. The transcrystalline growth of HDPE on the PE fiber surface was found to consist of an inner and an outer zone. The inner zone, 2–3 μm thick, is composed of HDPE crystals nucleated on the PE fiber surface. Photomicrographs showed a well-defined region of row-nucleated HDPE on the surface of PE fiber. This means the fibrils of HDPE were found to grow out from the PE fiber axis and HDPE crystallites are oriented in planes perpendicular to the PE fiber axis. The fiber in the composite induced the transcrystalline growth of HDPE on the PE fiber surface at higher temperature than on cooling the melt. For 36 wt% fiber, the increase was 2.5°C, also resulting in ～ 10% more crystals. Crystallization of a composite with 50 wt% fiber at 124°C involved two steps: The first a fast transcrystallization of HDPE on the PE fiber surface followed by the bulk crystallization of the HDPE.     

马来酸二丁酯接枝PE的性能及应用

研究了由反应性挤出接枝技术制得的聚乙烯接枝马来酸二丁酯(PE-DBM)产品的性能及使用情况。实验发现,PE-DBM具有与PE相同的成型加工性,PE-DBM中部分游离态单体对后加工使用无不良影响.其应力-应变性能优于相应的PE。流变学研究表明PE-DBM是符合幂律方程的非牛顿型假塑性流体。PE-DBM适合与极性表面的填料共混并作为相容剂具有良好的效果。