木粉/POE协同改性PP的超临界CO_2发泡性能
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摘要
采用超临界二氧化碳作为发泡剂,用自制的高压反应釜,在一定温度、压力和保压时间等工艺条件下,探讨经预处理的木粉对高熔体强度聚丙烯(PP)/木粉发泡材料发泡性能的影响。当木粉用量为4份时,PP/木粉发泡材料发泡性能最佳,其发泡倍率最大,为12.6倍,表观密度最小,为0.069g/cm~3,泡孔平均直径为79μm。在木粉用量为4份基础上,研究乙烯–辛烯共聚物(POE)用量对PP/木粉/POE发泡材料发泡性能的影响。结果表明,当POE用量为15份时,得到最佳发泡性能的PP/木粉/POE发泡材料,其发泡倍率最大,为14.8倍,表观密度最小,为0.06g/cm~3,泡孔平均直径为174μm,泡孔分布最均匀。
Supercritical carbon dioxide was used as a blowing agent,and a self-made high pressure reactor was used,under the conditions of certain temperature,pressure and pressure holding time,the effects of pretreated wood ?our on foaming properties of high melt strength polypropylene(PP)/wood ?our foaming materials. The best foaming performance is obtained when the wood powder content is 4 phr,the expansion ratio is the maximum,which is 12.6 times,the apparent density is minimum,which is 0.069 g/cm~3,and the cell diameter is 79 μm. On the basis of 4 phr of wood ?our,the effects of the amount of ethylene-octene copolymer(POE) on the foaming properties of PP/wood ?our/POE foaming materials was studied. The results show that the PP/wood ?our/POE foaming material with optimum foaming properties is obtained when the POE content is 15 phr,the expansion ratio is the maximum,which is 14.8 times,the apparent density is minimum,which is a 0.06 g/cm~3,the cell diameter is 174 μm,and the microscopic cell distribution is the most uniform.
Supercritical carbon dioxide was used as a blowing agent,and a self-made high pressure reactor was used,under the conditions of certain temperature,pressure and pressure holding time,the effects of pretreated wood ?our on foaming properties of high melt strength polypropylene(PP)/wood ?our foaming materials. The best foaming performance is obtained when the wood powder content is 4 phr,the expansion ratio is the maximum,which is 12.6 times,the apparent density is minimum,which is 0.069 g/cm~3,and the cell diameter is 79 μm. On the basis of 4 phr of wood ?our,the effects of the amount of ethylene-octene copolymer(POE) on the foaming properties of PP/wood ?our/POE foaming materials was studied. The results show that the PP/wood ?our/POE foaming material with optimum foaming properties is obtained when the POE content is 15 phr,the expansion ratio is the maximum,which is 14.8 times,the apparent density is minimum,which is a 0.06 g/cm~3,the cell diameter is 174 μm,and the microscopic cell distribution is the most uniform.
引文
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[2]孟鸿诚,郭鹏,吕明福,等.高熔体强度聚丙烯的应用及市场分析[J].石油化工,2018,47(8):896-900.Meng Hongcheng,Guo Peng,Lyu Mingfu,et al.Application and market analysis of polypropylene with high melt strength[J].Petrochemical Industry,2008,47(8):896-900.
[3]陈明,高山俊,沈春晖.聚丙烯微发泡材料改性研究进展[J].中国塑料,2018,32(5):8-13.Chen Ming,Gao Shanjun,Shen Chunhui.Research progress on modification of polypropylene microfoaming materials[J].China Plastics,2008,32(5):8-13.
[4]宋秉坤,何小芳,康冬冬,等.发泡聚丙烯的改性及其应用研究[J].化工新型材料,2018,46(2):22-25.Song Bingkun,He Xiaofang,Kang Dongdong,et al.Modification and application of foamed polypropylene[J].New Chemical Materials,2018,46(2):22-25.
[5]张伟.高熔体强度聚丙烯发泡材料的制备及性能研究[D].合肥:安徽大学,2016.Zhang Wei.Preparation and properties of high melt strength polypropylene foam[D].Hefei:Anhui University,2016.
[6]Xu Zhimei,Jiang Xiulei,Liu Tao,et al.Foaming of polypropylene with supercritical carbon dioxide[J].Polymer,2007,41:299-310.
[7]郭鹏,吕明福,吕芸,等.聚丙烯发泡材料的研究进展[J].石油化工,2011(6):679-684.Guo Peng,Lu Mingfu,Lyu Yun,et al.Research progress in polypropylene foams[J].Petrochemical Technology,2011(6):679-684.
[8]周吓星,陈礼辉,林巧佳.竹粉/聚丙烯发泡复合材料的增韧效果[J].农业工程学报,2013,29(2):266-272.Zhou Xiaxing,Chen Lihui,Lin Qiaojia.Toughening effect of bamboo flour/polypropylene foamed composite[J].Transactions of the Chinese Society of Agricultural Engineering,2013,29(2):266-272.
[9]王朝,李姜,郭少云.超临界CO2下聚丙烯/乙烯-辛烯共聚物共混物微孔发泡材料的制备[J].高分子材料科学与工程,2017,33(10):108-113.Wang Chao,Li Jiang,Guo Shaoyun.Preparation of microcellular polypropylene/poly(octene-ethylene)foams by using supercritical carbon dioxide[J].Polymer Materials Science&Engineering,2017,33(10):108-113.
[10]Kumar V,Suh N P.A process for making mmicrocellular thermoplastic parts[J].Polymer Engineering&Science,1990,30(20):1 323-1 329.
[11]Kokta B V,Maldas D,Daneault C,et al.Composites of polyvinyl chloride-wood fibers.III:Effect of Silane as Coupling Agent[J].Journal of Vinyl and Additive Technology,1990,12(3):146-153.
[12]胡文涛,郝长印,严正.成型工艺对超临界二氧化碳发泡HMSPP结构与性能的影响[J].塑料工业,2017(6):74-79.Hu Wentao,Hao Changyin,Yan Zheng.Influence of molding process on structure and properties of HMSSPP foams by supercitical carbon dioxide[J].China Plastics Industry,2017(6):74-79.
[13]杨明警,严正,苏旺,等.成型工艺对超临界CO2发泡PP结构与性能的影响[J].工程塑料应用,2016,44(1):62-67.Yang Mingjing,Yan Zheng,Su Wang,et al.Influence of molding process on structure and properties of polypropylene foams in supercitical CO2[J].Engineering Plastics Application,2016,44(1):62-67.
[14]熊业志,王学林,张荣,等.聚丙烯/木粉釜压珠粒发泡研究[J].塑料工业,2016,44(5):62-65.Xiong Yezhi,Wang Xuelin,Zhang Rong,et al.Study on bead foaming of polypropylene/wood flour composites with antoclave method[J].China Plastics Industry,2016,44(5):62-65.
[15]王霞,李浩,宋永明,等.木粉/聚丙烯复合材料的流变性能研究[J].西南林业大学学报.2016(4):145-151.Wang Xia,Li Hao,Song Yongming,et al.Research on rheological properties of wood flour/polypropylene composites[J].Journal of Southwest Forestry University,2016(4):145-151.
[16]钟亚林,黄汉雄.基于相形态的微孔发泡PP/POE共混物泡孔结构调控[J].高分子学报,2015(6):720-726.Zhong Yalin,Huang Hanxiong.Cellular structure manipulation of microcellular pp/poe blends based on phase morphology[J].Acta Polymerica Sinica,2015(6):720-726.