气体反压对微孔发泡注塑制品泡孔质量的影响
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摘要
以化学欠注发泡法制备聚丙烯(PP)发泡材料,研究了气体反压(GCP)对泡孔形貌和泡孔参数的影响,同时分析了GCP的影响机理。结果表明,随着GCP从0MPa增大到0.8MPa,泡孔直径从36.09μm增大到41.93μm,规则泡孔层的厚度所占比例从10.9%增加到26.7%,泡孔变形层厚度所占比例从63.7%下降到45.4%,变形区泡孔变形度也从0.53减小到0.304。GCP提高了熔体充模过程中的压力,降低了泡孔在充模中的成核速率,减弱了流场对泡孔的影响,同时泡孔受到熔体的约束力增大,泡孔不易发生变形,泡孔形态变好。
PP foams were prepared by chemical foaming method to study the effect of gas counter pressure on cell morphologyand structure parameters,and the in?uence mechanism was investigated. The results show that with the gas counter pressure(GCP)increasing from 0 MPa to 0.8 MPa,the cell diameter increases from 36.09 μm to 41.93 μm,the regular cell layer thickness ratioincreases from 10.9% to 26.7%,the irregular cell layer thickness ratio decreases from 63.7% to 45.4%,and the cell deformation de-gree of the irregular cell layer decreases from 0.53 to 0.304. GCP improves the pressure and reduces the nucleation rate of the cells inthe melt ?lling process,and weakenes the in?uence of ?ow ?eld on the cell growth. At the same time,the constraining force on thecells increases,which resultes that the cells are uneasy to be deformed and the cell morphology become better.
PP foams were prepared by chemical foaming method to study the effect of gas counter pressure on cell morphologyand structure parameters,and the in?uence mechanism was investigated. The results show that with the gas counter pressure(GCP)increasing from 0 MPa to 0.8 MPa,the cell diameter increases from 36.09 μm to 41.93 μm,the regular cell layer thickness ratioincreases from 10.9% to 26.7%,the irregular cell layer thickness ratio decreases from 63.7% to 45.4%,and the cell deformation de-gree of the irregular cell layer decreases from 0.53 to 0.304. GCP improves the pressure and reduces the nucleation rate of the cells inthe melt ?lling process,and weakenes the in?uence of ?ow ?eld on the cell growth. At the same time,the constraining force on thecells increases,which resultes that the cells are uneasy to be deformed and the cell morphology become better.
引文
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[3]Wu Shan,He Li,Zhang Chun,et al.Visualization observation of cells growth in low-density polyethylene foaming processes[J].Polymer Testing,2017,63:367-374.
[4]Dong G,Zhao G,Guan Y,et al.The cell forming process of microcellular injection-molded parts[J].Journal of Applied Polymer Science,2014,131(12):383-390.
[5]Elduque D,Clavería I,Fernándezá,et al.Methodology to analyze the influence of microcellular injection molding on mechanical properties with samples obtained directly of an industrial component[J].Polymers&Polymer Composites,2014,22(8):743-752.
[6]刘阳夫,张翔,张纯,等.欠注成型工艺对PP微孔发泡材料发泡行为的影响[J].塑料工业,2015,43(9):61-65.Liu Yangfu,Zhang Xiang,Zhang Chun,et al.Effects of owe injection foaming method on foaming behaviors of PP microcellular foams[J].China Plastics Industry,2015,43(9):61-65.
[7]Hayashi H,Mori T,Okamoto M,et al.Polyethylene ionomerbased nano-composite foams prepared by a batch process and MuCell?injection molding[J].Materials Science and Engineering:C,2010,30(1):62-70.
[8]Li Shuai,Zhao Guoqun,Dong Guiwei,et al.Study on reducing sink mark depth of a microcellular injection molded part with many reinforcing ribs[J].Journal of Cellular Plastics,2016,52(5):479-502.
[9]Gómez-Gómez J F,Arencón D,Sánchez-Soto M A,et al.Influence of the injection-molding parameters on the cellular structure and thermo-mechanical properties of ethylene-propylene block copolymer foams[J].Advances in Polymer Technology,2013,32(S1):692-704.
[10]Yuan Mingjun,Turng L,Gong Shaoqin,et al.Study of injection molded microcellular polyamide-6 nanocomposites[J].Polymer Engineering&Science,2004,44(4):673-686.
[11]Yamada T,Murata Y,Yokoi H.Visualization analysis of a multilayer foam development process in microcellular injection molding[J].International Polymer Processing,2012,27(3):299-309.
[12]Li Shuai,Zhao Guoqun,Wang Guilong,et al.Influence of relative low gas counter pressure on melt foaming behavior and surface quality of molded parts in microcellular injection molding process[J].Journal of Cellular Plastics,2014,50(5):415-435.
[13]Chen S C,Liao W H,Chien R D.Structure and mechanical properties of polystyrene foams made through microcellular injection molding via control mechanisms of gas counter pressure and mold temperature[J].International Communications in Heat&Mass Transfer,2012,39(8):1 125-1 131.
[14]Zhang Lei,Zhao Guoqun,Dong Guiwei,et al.Bubble morphological evolution and surface defect formation mechanism in the microcellular foam injection molding process[J].RSC Advances,2015,5(86):70032-70050.
[15]Colton J S,Suh N P.Nucleation of microcellular foam:theory and practice[J].Polymer Engineering&Science,1987,27(7):500-503.
[16]Colton J S,Suh N P.The nucleation of microcellular thermoplastic foam with additives:Part I:Theoretical considerations[J].Polymer Engineering&Science,1987,27(7):485-492.