共查询到17条相似文献,搜索用时 93 毫秒
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采用 Innovenes 工艺,双环管淤浆法,1-已烯为共聚单体开发生产了 PE100级管材专用高密度聚乙烯(HDPE)树脂PN049-030-122,分析了其结构、力学性能及加工应用情况,并与国内外同类产品进行了对比.HDPEPN049-030-122的熔体流动速率为0.290~0.300 g/10 min,密度为0.949g/cm3,拉伸弹性模量达1 100 MPa以上,简支梁缺口冲击强度大于30 kJ/m2,各项性能达到指标要求,相对分子质量分布曲线呈双峰. 相似文献
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分析了高密度聚乙烯(HDPE)管材专用树脂DGDB 2480H及典型双峰PE 100级管材专用树脂的性能。两者的力学性能相当;DGDB 2480H具有较低的剪切黏度,有利于管材的加工成型,熔体强度为1.05 MPa,与国产及进口管材专用树脂相当,比普通HDPE大,有利于大口径管材的挤出。 相似文献
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HDPE管材专用树脂的流变性能 总被引:1,自引:1,他引:0
应用动态流变仪、毛细管流变仪和转矩流变仪,对新型双峰高密度聚乙烯(HDPE)管材专用树脂 6380 M进行流变性能测试分析,并与国内外相同压力等级的HDPE管材专用树脂进行比较。结果表明,6380 M的各种流变性能与进口管材专用树脂相当,而与单峰HDPE管材专用树脂相比具有弹性模量低、零切黏度低、拉伸黏度低的流变特性,从而对其加工性能产生影响。6380 M流动性好,其临界剪切速率高,但熔体强度不及单峰HDPE。 相似文献
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研究了高密度聚乙烯(HDPE)树脂的反应工艺条件与产品物性的对应关系,通过分析反应压力、反应温度、共聚单体和停留时间对产品性能的影响,确定了生产HDPE管材专用料YEM4803T的工艺参数,工业化生产了YEM4803T产品,对该产品进行了物性测试和加工应用试验。结果表明,YEM4803T加工流动性能和物理性能优良。 相似文献
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Veerle De Graef Bart Goderis Peter Van Puyvelde Imogen Foubert Koen Dewettinck 《European Journal of Lipid Science and Technology》2008,110(6):521-529
To follow palm oil crystallization under shear, a new rheological method was developed. This method can be split up into two parts: In the first part, continuous shear is applied for a pre‐defined period and crystallization is monitored by measuring the apparent viscosity as a function of isothermal time under shear. In the second part, shear is halted and oscillation is applied during 30 s, thus recording moduli and phase angle. These moduli and phase angle are then characteristic of a sample crystallized under shear during this pre‐defined period. After repeating this procedure for increasing shearing periods in the first part, complex modulus and phase angle were plotted as a function of isothermal time under shear. The thus obtained results were compared with crystallization data obtained via time‐resolved X‐ray diffraction and polarized light microscopy. 相似文献
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用固体核磁技术分析了2种具有不同抗熔垂性能的聚乙烯管材料的凝聚态结构与流变性能。管材树脂的抗熔垂性能与其核磁迟豫特性紧密相关,好的抗熔垂性能对应更长的纵向迟豫时间。抗熔垂性能好的双峰管材料的重均分子量更高,高相对分子质量部分的含量更多。 相似文献
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利用淤浆法串联聚合丁艺产品具有相对分子质量双峰分布的特点,结合管材专用树脂的物性及微观结构特点,确定了由第一聚合釜均聚合生产低相对分子质量产品、第二聚合釜共聚合生产高相对分子质量产品的生产工艺。通过对2个聚合釜聚合温度、聚合压力、共聚单体的加入量和氢气与乙烯比等工艺参数的分析和调整.得到适合高级别管材专用树脂的最佳生产条件,产品的最小要求强度超过8MPa,达到管材专用树脂PE80的等级。 相似文献
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根据聚乙烯(PE)管材对原料的要求,利用铬系催化剂开发了PE管材专用树脂,并对其进行了等级认证。结果表明:专用树脂最小要求强度为8.0 MPa,达到了PE 80等级;其原料及制品性能也满足GB 15558.1-2003的要求。 相似文献
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A natural frequency approach to study the blown film helicoidal stability of HDPE bimodal resins and its relation to their rheological behavior
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Cecilia D. Treviño‐Quintanilla Fabián Luna Cabrera Jaime Bonilla‐Ríos Leonardo F. Cortes Rodríguez 《Polymer Engineering and Science》2015,55(12):2910-2921
A quantitative study of the helicoidal bubble stability (HBS) of five different HDPE bimodal resins processed under the same conditions was conducted to determine their natural frequencies and how these are related to molecular weight distribution features and typical viscoelastic data. The natural frequency , of each resin was obtained by representing the HBS phenomenon as an undamped system under the influence of a harmonic force, whose solution required force balance and Fourier series analyses of video‐recorded oscillations of the bubbles. It was found that was directly related to the stability grading on these bimodal resins established by experimental technicians running the blown film line. The same trends were observed when comparing with the entanglement index, MwB/Me, the characteristic retardation time t67% obtained from recovery compliance data, and the cross‐over point frequency (COP). These trends were not linear, indicating perhaps the existence of a percolation threshold for with respect to the entanglement index and to the mentioned rheological parameters. POLYM. ENG. SCI., 55:2910–2921, 2015. © 2015 Society of Plastics Engineers 相似文献