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超高他子量聚乙烯挤出管材成型设备与技术 总被引:6,自引:1,他引:5
论述了用单螺杆挤出机成型雪高分子量聚乙烯管材的成型技术,包括专用螺杆的设计、管材模具的设计、挤出配方的设计,以及成型工艺的特点、管材冷却定型技术等。 相似文献
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超高相对分子质量聚乙烯管材新型连续挤出成型技术 总被引:1,自引:0,他引:1
超高相对分子质量聚乙烯(PE-UHMW)管材连续挤出成型法有压制-烧结、柱塞推压、单螺杆挤出、双螺杆挤出和柱塞冲压挤出等几种,其中柱塞冲压挤出成型法是新开发的一种PE-UHMW管材连续挤出成型技术,该技术的突出优点表现在:能加工任意相对分子质量的PE-UHMW树脂,加工能力强;能实现连续挤出,生产效率不低于单螺杆挤出法,而制品的表面质量、力学性能(如耐磨性)则优于单螺杆挤出法;完全正位移输送机理,温度控制简单可靠(控温段只有三个),因此加工过程中的降解程度较小,能很好地保持原料固有的优良性能;主机结构简单,能耗低(约为螺杆挤出法的30%~50%),生产线造价便宜。另外,采用该技术还能挤出高质量的聚四氟乙烯(PTVE)和过氧化物交联聚乙烯(PEX-a)制品。 相似文献
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采用单螺杆挤出法,使用不同相对分子质量的超高相对分子质量聚乙烯(PE-UHMW),通过改变活性炭与PE-UHMW的比例,制备活性炭/PE-UHMW微孔管材;采用扫描电子显微镜和压汞仪分析了微孔管材的微孔结构和参数,同时还测试了微孔管材的密度和压缩强度。结果表明,PE-UHMW有助于活性炭的挤出,但若其含量过高,很容易将活性炭包覆起来堵塞微孔;采用单螺杆挤出法制备活性炭/PE-UHMW微孔管材,其微孔孔径和开孔率可与传统烧结成型法制备的微孔管材相媲美;微孔管材的密度和压缩强度随组分中的PE-UHMW的相对分子质量的增大而减小,随PE-UHMW含量的增大而减小。 相似文献
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谢建玲 《现代塑料加工应用》2000,(6)
简要介绍了聚乙烯管材的发展过程 ,分析了聚乙烯管原料标准、给水用聚乙烯管材和燃气用埋地聚乙烯管材标准对原料性能的要求 ,可供聚乙烯管材原料生产厂生产和选用管材原料参考 ,以提高我国聚乙烯管材开发和使用水平 相似文献
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同心双螺杆成型纯超高分子量聚乙烯管材新方法 总被引:1,自引:0,他引:1
介绍了一种采用同心双螺杆挤出机实现流动性差纯UHMWPE管材连续挤出成型的新技术;该技术解决了流动性差这类高分子材料管材螺杆挤出成型的技术难题. 相似文献
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提出并完成一种投资小、设备简单,适合于多品种、小批量生产超高摩尔质量聚乙烯(UHMWPE)管件的方法。该方法通过在UHMWPE管材生产线上添加一套辅助装置,可制备任意角度和一定级差变化的UHMWPE弯头。以UHMWPE管材为原料,在特殊设计的设备上,将支管和直管沿交接线熔接在一起,可制得各种规格的UHMWPE三通。提出了UHMWPE管件应用中的注意事项。 相似文献
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超高分子量聚乙烯管材性能分析与比较 总被引:1,自引:0,他引:1
对超高分子量聚乙烯管材与其他塑料管材的主要性能进行了分析与比较,结果表明UHMWPE管材具有优良的性能价格比,应用领域极广,是替代镀锌钢管,铸铁管,钢管等金属管道的理想管材。 相似文献
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Yanhong Feng Yu Gao Jiejie Chen Jinhui Jiang Xiaochun Yin Guangjian He Yanxiang Zeng Qinglin Kuang Jinping Qu 《Polymer International》2019,68(5):862-870
Low processing efficiency and fusion defects limit the application of ultra‐high molecular weight polyethylene (UHMWPE) in artificial joint implants. These problems result from the high melt viscosity of UHMWPE. Here, we use an eccentric rotor extruder (ERE) based on elongational flow to pretreat UHMWPE. Compression molded UHMWPE is obtained without and with ERE pretreatment (EP‐UHMWPE). The processing efficiency of EP‐UHMWPE is improved compared with direct compression molded UHMWPE. This is because the preheating time can be omitted during the molding process, and the residence time of UHMWPE in the extruder is less than 90 s. The mechanical properties and friction resistance of EP‐UHMWPE are significantly improved compared with those of direct compression molded UHMWPE. The yield strength increases from 21 MPa to 23 MPa, the tensile strength increases from 36 MPa to 46 MPa, the elongation at break increases from 610% to 700%, and the abrasion loss decreases from 1.73 mg/1000 r to 0.93 mg/1000 r when UHMWPE is subjected to ERE pretreatment. We attribute these improvements to the elongational flow enhancing the orientation and disentanglement of UHMWPE molecular chains, which in turn improves particle fusion. The molecular weight is well maintained when subjected to ERE pretreatment. UHMWPE components pretreated by ERE have good prospects in artificial joint implants. © 2019 Society of Chemical Industry 相似文献
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根据原油输送的特点。结合输送原油对管道的要求,采用挤出成型制得超高分子量聚乙烯(UHMWPE)管材,并使之与钢管复合,得到UHMWPE/钢复合管。介绍了输油专用UHMWPE/钢复合管的优点。并与目前使用的几种输油管进行了对比。结果表明,UHMWPE/钢复合管的性能价格比优于目前使用的几种输油管。 相似文献
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Melt mixing in an extruder with polymers is an effective approach for forming nanocomposites, allowing mass production applications. The intent of this study is to investigate carbon nanofiber composites with ultrahigh molecular weight polyethylene (UHMWPE) matrix using the twin‐screw extruder. To decrease the high viscosity of UHMWPE, a low density polyethylene (LDPE) was added into the UHMWPE. The effects of carbon nanofibers (CNFs) on the crystalline structures and properties of the nanocomposites were analyzed. The differential scanning calorimetry (DSC) and X‐ray diffraction (XRD) measurements showed the addition of CNFs decreases the degree of crystallinity, but does not impart significant effects on the crystalline structure of the UHMWPE/LDPE blend. Tensile test results showed that the nanocomposite with loading of 3 wt % CNFs had an increase of 38% in tensile strength and 15% in modulus. The thermal stability and thermal conductivity of UHMWPE/LDPE blends were also enhanced by the addition of CNFs. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献