聚乙烯系新型塑料给水管的发展

介绍了聚乙烯(PE)管、交联聚乙烯(PEX)管、耐高温非交联PE管、超高摩尔质量PE管、铝塑复合管5种聚乙烯系新型塑料给水管的性能特点及其发展。     

日本2004年公布的JISK类标准目录(续)

新修订标准JISK 672 2　聚偏二氯乙烯试验方法JISK 673 9　排水用硬聚氯乙烯管配件JISK 6741　硬聚氯乙烯管JISK 6742　输水用硬聚氯乙烯管JISK 6743　输水用硬聚氯乙烯管配件JISK 6746　塑料焊条JISK 6761　通用聚乙烯管JISK 6762　输水用双层壁聚乙烯管JISK 6769　交联聚乙烯管JISK 6770　交联聚乙烯管配件JISK 6776　耐热硬聚氯乙烯管JISK 6777　耐热硬聚氯乙烯管配件JISK 6778　聚丁烯 (PB)管JISK 6779　聚丁烯 (PB)管配件JISK 6787　输水用交联聚乙烯管JISK 6788　输水用交联聚乙烯管配件JISK 6792　输水…     

国外塑料管材应用概况

目前,国外塑料管材采用的树脂种类繁多,如高、中密度聚乙烯管,聚丙烯管,聚丁烯管,聚氯乙烯管,氯化改性聚乙烯管,氯化聚乙烯管,玻璃纤维增强管,纤维增强管,ABS管,发泡ABS管,等等。它们都以各自突出的性能在某些领域获得了应用,特别是HDPE(高密度聚乙烯)管,GRP(Glass fiber Reinforced Plastic玻璃纤     

能源管输领域中的PE管材及其配套技术

综述了目前国内外能源管输领域中三种PE管材高密度聚乙烯(HDPE)管、中密度聚乙烯(MDPE)管和交联聚乙烯(XLPE)管同传统金属管材相比所具有的优点.介绍了PE管材的热熔、电熔等连接配套技术,冷拔、缩径膨胀等钢塑复合配套技术,及利用PE管对金属旧管道进行不开挖修复技术(Trenchless Technology).     

聚乙烯管材料抵抗慢速裂纹扩展性能研究

研究了共聚单体的种类、含量以及相对分子质量、共聚单体支化链在主链上的分布等因素对聚乙烯管材料抵抗慢速裂纹扩展(SCG)性能的影响。结果表明,己烯共聚聚乙烯管材料较丁烯共聚聚乙烯管材料具有更好的SCG抵抗性能;共聚单体摩尔百分含量从0.35增加至0.86,聚乙烯管材料发生慢速裂纹破坏时间可从150h增加至4000h以上;增大聚乙烯管材料的相对分子质量,可提高材料的SCG抵抗性能;共聚单体在主链上的分布对于聚乙烯管材料的SCG抵抗性能有重要影响,分布均匀、两支化链之间距离较长的聚乙烯管材料较分布不均匀、有较多相对距离较短的支化链的聚乙烯管材料具有更优异的SCG抵抗性能。     

我国塑料管行业市场发展分析

1我国塑料管行业市场规模塑料管道是化学建材众多组成部分中的一个重要分支,从使用化工材料的不同分类上看,塑料管道可分为聚氯乙烯(PVC)管、聚乙烯PE管、聚丙烯(PP)管、聚丁烯(PB)管、ABS管等。塑料管道的应用领域通常为给水、排     

交联聚乙烯管国内外发展概况

介绍了交联聚乙烯(PE-X)及其管材的交联机理和产品特点.比较了过氧化物PE-X管、硅烷PE-X管、辐照PE-X管的生产工艺和产品优缺点.综述了PE-X管国内外近几年的发展、市场需求、生产以及专用料的开发应用情况,针对地暖管领域目前市场使用的PE-X管、耐热聚乙烯管、无规共聚聚丙烯管、聚1-丁烯管进行性能比较,阐述了P...     

聚乙烯粉末涂层钢管

主要介绍聚乙烯树脂的物理性能、聚乙烯粉末涂层钢管(含异形管、油罐、接头)的制造、检查方法及制造的范围、涂层钢管的特性和用途等。     

塑料水管中挥发性有机物的迁移研究

介绍了高密度聚乙烯管(PE-HD)、交联聚乙烯管(PE-X)和硬质聚氯乙烯管(PVC-U)中的挥发性有机成分向水中的迁移测定研究。PE-HD中主要的迁移成分是2,4-二-间-丁基-苯酚(2,4.-DTBP),是酚类抗氧化剂的降解产物,除此之外降解产物还有醋、乙醛、酮、芳香烃和菇类化合物。根据塑料管接触水的极限臭味值(TON)估测,在测试的7种PE-HD管材中有5种PE-HD管的TON-4; 2种PE-HD管释放到水中挥发性有机物(VOC)的总量基本恒定;PEX管迁移实验显示大量的VOC迁移到水中(TON-5),其中一些迁移的VOC成分不确定;HPVC管向水中迁移的挥发性物质很少。     

一种新型HDPE塑料挤出机

主要介绍了高密度聚乙烯(HDPE)缠绕增强管及其特点。研究高密度聚乙烯(HDPE)缠绕增强管挤出机技术特点,说明其技术及应用的可行性。创新性的提出了一种新型搅拌杆屏障端螺杆,并通过开发管道冷却装置提升产品质量和成品率并获得专利。     

聚乙烯管材的发展前景

详细分析了国内外聚乙烯管材的应用状况 ,并将它与其他塑料管材比较而介绍了它的优点 ,预测了聚乙烯管材的发展趋势 ,提出了重视发展聚乙烯管材的建议。     

Weather-Induced Degradation of Plastic Pipes

A number of plastic materials, such as unplasticized poly(viny1 chloride) (uPVC), acrylonitrile-butadiene-styrene (ABS), high-density polyethylene (HDPE), poly-(vinylidene fluoride) (PVDF), and chlorinated poly(viny1 chloride) (cPVC), are available for numerous applications. uPVC and HDPE pipes are used in pressurized piping systems in Saudi Arabia for industrial, agricultural, domestic, and general-purpose applications. Some studies have been carried out to investigate the causes of failure in plastic pipes, which is very high in the area. In this chapter an overview of the failure of plastic pipes is presented, with emphasis given to failure of pipes due to severe weather conditions in Saudi Arabia.     

聚乙烯塑料管的设计选择

概略介绍了聚乙烯塑料管的材料性能规格、作为压力管线的设计选择,以及管子安装的要求。     

多孔塑料管材挤出工艺和机头模具

扼要介绍了多孔塑料管材的用途、性能、制造方法、配方、生产工艺和机头模具的设计     

马来酸酐接枝聚乙烯在铝塑复合管上的应用研究

研究了基体树脂、引发剂等对马来酸酐接枝乙烯性能的影响,确定了反应剂出工艺参数,介绍了应用效果。结果表明,马来酸酐接枝聚乙烯可用于铝塑复合管的热熔粘接涂层,具有良好的粘接性能和工艺性,能满足制备铝塑复合管的使用要求。     

High-density polyethylene pipe with high resistance to slow crack growth prepared via rotation extrusion

Slow crack growth (SCG) is one failure principal mode in polyethylene (PE) pressure pipe applications. In the conventional extrusion process, the molecular chains in the plastic pipes are oriented along the axial direction, which are disadvantageous to their resistance to SCG. In order to change the orientation direction of molecules in the plastic pipe, a new rotation extrusion processing system was designed to extrude high-density polyethylene (HDPE) pipes, and a thorough research was done on the effect of the rotation speed on its microstructure and resistance to SCG during the rotation extrusion. The experimental results showed that when the die rotated during the extrusion process of PE pipes, the hoop stress exerted on the polymer melt could make the molecular orientation deviate from the axial direction, and therefore the consequent multi-axial orientation of molecular chains could be obtained. As a result, the PE pipe with better resistance to SCG was prepared. Compared to the PE pipe produced by the conventional extrusion, the crack initiation time of the PE pipe manufactured by the novel method increased from 27 to 57 h.     

新型塑料管及其应用

介绍比较了几种新型塑料管的性能特点和用途 ,包括PP管、PE管、PVC管、PB管、ABS管 ,并论述了塑料管在国内外的发展现状和前景。     

中国塑料管道新产品和新型塑料管道系统

综述了近年来中国塑料管道行业涌现的改性聚氯乙烯（PVC-M）管、双轴取向聚氯乙烯（PVC-O）管、耐热聚乙烯（PE-RT）管、β-PP-R管、超高相对分子质量聚乙烯（PE-UHMW）管等塑料管道新产品的研发和应用进展,介绍了塑料和金属复合管道及塑料和塑料复合管道的技术特点和应用领域。此外,对于一些新出现的塑料管道系统也做了详细的阐述,重点说明了它们和建筑应用技术结合的优势。最后,结合国家的产业政策,对中国塑料管道行业前景进行分析和展望。     

Accelerated testing method to estimate the long-term hydrostatic strength of semi-crystalline plastic pipes

The ability to quickly develop predictions of the service lifetime of plastic pipes at different load levels allows designers to choose the best plastic material and design pipe for a specific application. Additionally, it helps material producers to rapidly design, manufacture, test, screen, and modify the base polymeric material. The aim of this study is to introduce a combined experimental and analytical framework to develop accelerated lifetime estimates for semi-crystalline plastic pipes which is sensitive to the structure, orientation, and morphology changes introduced by changing processing conditions. To accomplish this task, high density polyethylene (HDPE) is chosen as the exemplary base material and custom fixtures are developed to admit tensile and hoop burst tests on the as-manufactured HDPE pipes. A pressure-modified Eyring flow equation is employed to predict the rupture lifetime of HDPE pipes using the measured mechanical properties under uniaxial tensile and compression loading in different temperatures and strain rates. The method allows the prediction of pipe service lifetimes in excess of 50 years using experiments conducted over approximately 10 days instead of the traditional 13 months. POLYM. ENG. SCI., 60:879–888, 2020. © 2019 Society of Plastics Engineers