分子量分布和注射工艺对聚丙烯物性的影响
|
摘要
选用4种分子量分布不同的高流动共聚聚丙烯为原料,分别调整熔体温度、注射速度和保压时间,研究其对材料性能的影响。结果表明,分子量分布较宽(PD大于7)的高流动共聚聚丙烯的材料性能对注射工艺的调整不敏感,冲击性能和热性能都非常稳定,数据波动范围分别在0. 4 k J/m2和4℃以内。分子量分布较窄(PD小于7)的高流动共聚聚丙烯的冲击性能和热性能随注射工艺的调整波动幅度明显增大。在注射工艺中,熔体温度的影响最大。熔体温度从200℃降低至180℃,可使PD为4. 8的高流动共聚聚丙烯的冲击值由7. 8 k J/m2升至10. 2 k J/m2。分子量分布较窄的高流动共聚聚丙烯在加工过程中,为提高性能数据的稳定性和可重复性,需要严格控制加工窗口。
Effect of melt temperature,injection speed and packing time on the properties of 4 kinds of high fluidity copolymerized polypropylene with different polydispersity( PD) were studied. PP with wide polydispersity index( PD > 7) had a wide process window,the impact property and thermal property were stable under the condition of different injection parameters. The wave range of its Charpy impact was under 0. 4 k J/m2,and the wave range of HDT was under 4 ℃. The wave range of the test data of PP with narrow polydispersity( PD < 7) was apparently higher than wide polydispersity. Melt temperature had a great influence on the properties of PP with narrow polydispersity. The Charpy impact of PP with PD of 4. 8 raised from 7. 8 k J/m2 to 10. 2 k J/m2,while the melt temperature was reduced from 200 ℃ to 180 ℃. To keep the stability and repeatability of test data,the processing window of PP with narrow polydispersity should be controlled strictly.
Effect of melt temperature,injection speed and packing time on the properties of 4 kinds of high fluidity copolymerized polypropylene with different polydispersity( PD) were studied. PP with wide polydispersity index( PD > 7) had a wide process window,the impact property and thermal property were stable under the condition of different injection parameters. The wave range of its Charpy impact was under 0. 4 k J/m2,and the wave range of HDT was under 4 ℃. The wave range of the test data of PP with narrow polydispersity( PD < 7) was apparently higher than wide polydispersity. Melt temperature had a great influence on the properties of PP with narrow polydispersity. The Charpy impact of PP with PD of 4. 8 raised from 7. 8 k J/m2 to 10. 2 k J/m2,while the melt temperature was reduced from 200 ℃ to 180 ℃. To keep the stability and repeatability of test data,the processing window of PP with narrow polydispersity should be controlled strictly.
引文
[1]陈智能,黄峰,李延亮,等.高流动性聚丙烯的熔融剪切流动行为[J].合成树脂及塑料,2013,30(6):28-30.
[2]刘义,竺栋荣,张长军,等.高流动抗冲击聚丙烯的开发研究[J].齐鲁石油化工,2013,41(2):91-95.
[3]张纪贵.高流动聚丙烯生产技术研究进展[J].化工进展,2010,29(11):2039-2042.
[4]谭捷,蔡伟,易志勤,等.高流动共聚聚丙烯HHP10的研发[J].塑料科技,2012,40(6):54-57.
[5]徐莹.高流动透明聚丙烯的应用研究及市场进展[J]国外塑料,2012,30(1):30-34.
[6]孙晋,李永泉,李峰.注塑成型工艺参数对汽车保险杠翘曲变形的影响研究[J].塑料工业,2011,39(5):49-53.
[7]曹瑾瑾,谢昕,雷自强,等.注射工艺条件对抗冲共聚聚丙烯力学性能的影响[J].塑料科技,2011,39(11):63-68.
[8] MASPOCH M L,GAMEZ-PEREZ J,GIMINEZ E,et al. Influence of processing on ethylene-propylene block copolymers:structure and mechanical behavior[J]. Journal of Applied Polymer Science,2004,93(6):2866-2878.
[9] DA SILVA A L N,ROCHA M C G,COUTINHO F M B,et al.Rheological and thermal properties of binary blends of polypropylene and poly(ethylene-co-1-octene)[J]. Journal of Applied Polymer Science,2001,79(9):1634-1639.
[10] CHUANG M,YANG Y,HSIAO Y. Modeling and optimization of injection molding process parameters for thin-shell plastic parts[J].Polymer-Plastics Technology and Engineering,2009,48(7):745-753.
[11] MODESTI M,LORENZETTI A,BON D,et al. Effect of processing conditions on morphology and mechanical properties of compatibilized polypropylene nanocomposites[J]. Polymer,2005,46(23):10237-10245.
[12]曹民干,何戈博.注射工艺条件与PP-R管接头冲击强度的关系[J].工程塑料应用,2002,30(10):25-26.
[13]辛长征,石素宇,许文仲,等.熔体温度对HDPE微制品结构及性能的影响[J].塑料科技,2015,43(12):43-48.
[14]任玉方.α成核剂和工艺条件对聚丙烯注射件结晶与力学性能的影响[D].郑州:郑州大学,2014.
[15]雷洋.β成核剂及注塑工艺条件对等规聚丙烯性能与结构的影响[D].郑州:郑州大学,2014.
[16] KALAY G,BEVIS M J. Processing and physical property relationships in injection-molded isotactic polypropylene. 2. morphology and crystallinity[J]. Journal of Polymer Science, Part B:Polymer Physics,1997:35(2):265-291.
[17]ERMK R,OBADAL M,PONIL P,et al. Injection-mouldedα-andβ-polypropylenes:Ⅱ. tensile properties vs. processing parameters[J]. European Polymer Journal,2006,42(9):2185-2191.
[18] SAHIN S,YAYLA P. Effects of processing parameters on the mechanical properties of polypropylene random copolymer[J]. Polymer Testing,2005,24(8):1012-1021.
[19]郭建平,黄步明.塑料注塑加工中结晶与取向的探讨[J].工程塑料应用,2003,31(10):25-28.
[20] CHIVATANASOONTORN V,YAMADA K,KOTAKI M. Highly oriented microstructures and surface mechanical properties of polypropylene(PP)molded by ultra-high shear rate[J]. Polymer,2015,72:104-112.
[21]申长雨,陈静波,刘春太,等.塑料成型加工讲座(第五讲)塑料注射成型加工工艺[J].工程塑料应用,1999(7):28-33.
[22]朱杰,吕瑞华,李春,等.加工条件对聚丙烯釜内合金结构及性能的影响[J].东华理工大学学报:自然科学版,2013,36(3):328-331.
[23]宋满仓,刘柱,于同敏,等.注射工艺参数对超薄塑件成型影响实验研究[J].大连理工大学学报,2006,46(2):198-201.
[24]陈晋南,姜叶涛.背压对聚丙烯塑化过程的影响[J].工程塑料应用,2008,36(9):34-37.
[25]王云红,罗贤,张宝林,等.高流动抗冲聚丙烯专用料的结构与性能分析[J].中国塑料,2011,25(1):36-41.
[26]曹瑾瑾.抗冲共聚聚丙烯结构、性能及加工改性研究[D].兰州:西北师范大学,2012.
[27] MARTIN J,MARGUERON S,FONTANA M,et al. Study of the molecular orientation heterogeneity in polypropylene injection-molded parts by raman spectroscopy[J]. Polymer Engineering and Science,2010,50(1):138-143.
[2]刘义,竺栋荣,张长军,等.高流动抗冲击聚丙烯的开发研究[J].齐鲁石油化工,2013,41(2):91-95.
[3]张纪贵.高流动聚丙烯生产技术研究进展[J].化工进展,2010,29(11):2039-2042.
[4]谭捷,蔡伟,易志勤,等.高流动共聚聚丙烯HHP10的研发[J].塑料科技,2012,40(6):54-57.
[5]徐莹.高流动透明聚丙烯的应用研究及市场进展[J]国外塑料,2012,30(1):30-34.
[6]孙晋,李永泉,李峰.注塑成型工艺参数对汽车保险杠翘曲变形的影响研究[J].塑料工业,2011,39(5):49-53.
[7]曹瑾瑾,谢昕,雷自强,等.注射工艺条件对抗冲共聚聚丙烯力学性能的影响[J].塑料科技,2011,39(11):63-68.
[8] MASPOCH M L,GAMEZ-PEREZ J,GIMINEZ E,et al. Influence of processing on ethylene-propylene block copolymers:structure and mechanical behavior[J]. Journal of Applied Polymer Science,2004,93(6):2866-2878.
[9] DA SILVA A L N,ROCHA M C G,COUTINHO F M B,et al.Rheological and thermal properties of binary blends of polypropylene and poly(ethylene-co-1-octene)[J]. Journal of Applied Polymer Science,2001,79(9):1634-1639.
[10] CHUANG M,YANG Y,HSIAO Y. Modeling and optimization of injection molding process parameters for thin-shell plastic parts[J].Polymer-Plastics Technology and Engineering,2009,48(7):745-753.
[11] MODESTI M,LORENZETTI A,BON D,et al. Effect of processing conditions on morphology and mechanical properties of compatibilized polypropylene nanocomposites[J]. Polymer,2005,46(23):10237-10245.
[12]曹民干,何戈博.注射工艺条件与PP-R管接头冲击强度的关系[J].工程塑料应用,2002,30(10):25-26.
[13]辛长征,石素宇,许文仲,等.熔体温度对HDPE微制品结构及性能的影响[J].塑料科技,2015,43(12):43-48.
[14]任玉方.α成核剂和工艺条件对聚丙烯注射件结晶与力学性能的影响[D].郑州:郑州大学,2014.
[15]雷洋.β成核剂及注塑工艺条件对等规聚丙烯性能与结构的影响[D].郑州:郑州大学,2014.
[16] KALAY G,BEVIS M J. Processing and physical property relationships in injection-molded isotactic polypropylene. 2. morphology and crystallinity[J]. Journal of Polymer Science, Part B:Polymer Physics,1997:35(2):265-291.
[17]ERMK R,OBADAL M,PONIL P,et al. Injection-mouldedα-andβ-polypropylenes:Ⅱ. tensile properties vs. processing parameters[J]. European Polymer Journal,2006,42(9):2185-2191.
[18] SAHIN S,YAYLA P. Effects of processing parameters on the mechanical properties of polypropylene random copolymer[J]. Polymer Testing,2005,24(8):1012-1021.
[19]郭建平,黄步明.塑料注塑加工中结晶与取向的探讨[J].工程塑料应用,2003,31(10):25-28.
[20] CHIVATANASOONTORN V,YAMADA K,KOTAKI M. Highly oriented microstructures and surface mechanical properties of polypropylene(PP)molded by ultra-high shear rate[J]. Polymer,2015,72:104-112.
[21]申长雨,陈静波,刘春太,等.塑料成型加工讲座(第五讲)塑料注射成型加工工艺[J].工程塑料应用,1999(7):28-33.
[22]朱杰,吕瑞华,李春,等.加工条件对聚丙烯釜内合金结构及性能的影响[J].东华理工大学学报:自然科学版,2013,36(3):328-331.
[23]宋满仓,刘柱,于同敏,等.注射工艺参数对超薄塑件成型影响实验研究[J].大连理工大学学报,2006,46(2):198-201.
[24]陈晋南,姜叶涛.背压对聚丙烯塑化过程的影响[J].工程塑料应用,2008,36(9):34-37.
[25]王云红,罗贤,张宝林,等.高流动抗冲聚丙烯专用料的结构与性能分析[J].中国塑料,2011,25(1):36-41.
[26]曹瑾瑾.抗冲共聚聚丙烯结构、性能及加工改性研究[D].兰州:西北师范大学,2012.
[27] MARTIN J,MARGUERON S,FONTANA M,et al. Study of the molecular orientation heterogeneity in polypropylene injection-molded parts by raman spectroscopy[J]. Polymer Engineering and Science,2010,50(1):138-143.