不同成核剂及模温对聚丙烯注塑发泡材料性能的影响
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摘要
采用化学发泡注塑成型技术,在二次开模的条件下研究了不同成核剂及模温对聚丙烯(PP)注塑发泡材料性能(如泡孔尺寸分布、泡孔密度、皮层厚度及力学性能)的影响。结果表明:成核剂及模温的改变均会对泡孔形貌产生影响,添加成核剂和提高模温均可有效促进成核过程,增加泡孔数量。成核剂的引入对发泡PP力学性能的影响不大,而模温可以影响发泡PP的皮层厚度,进而使材料的力学性能发生变化。在泡孔结构(泡孔尺寸及其分布、泡孔数量)相近的情况下,皮层越厚材料的力学性能则越好。
The effects of nucleation agents and mold temperature on properties of injection molded polypropylene(PP) foams, including the effects on cell size distribution, cell densities, the thickness of the skin layer and mechanical properties of PP foams, were investigated using core-back injection foaming technology with chemical foaming agent. The results show that, both the nucleation agents and mold temperature can influence the cell morphologies of PP foams, and the nucleation process and cell densities can be promoted simultaneously. The addition of nucleation agents has little effect on mechanical properties of PP foams, while mold temperature can affect the skin thickness of PP foams which is related to mechanical properties. With a similar cell morphologies(cell size and its distribution, cell densities), the thickness of skin layer of PP foams has a signifi cant effect on mechanical properties of PP foams.
The effects of nucleation agents and mold temperature on properties of injection molded polypropylene(PP) foams, including the effects on cell size distribution, cell densities, the thickness of the skin layer and mechanical properties of PP foams, were investigated using core-back injection foaming technology with chemical foaming agent. The results show that, both the nucleation agents and mold temperature can influence the cell morphologies of PP foams, and the nucleation process and cell densities can be promoted simultaneously. The addition of nucleation agents has little effect on mechanical properties of PP foams, while mold temperature can affect the skin thickness of PP foams which is related to mechanical properties. With a similar cell morphologies(cell size and its distribution, cell densities), the thickness of skin layer of PP foams has a signifi cant effect on mechanical properties of PP foams.
引文
[1]刘臻青.化学微发泡注塑在汽车门内饰板的应用[J].汽车工程师,2017(4):47-50.
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[7]W Zhai,J Yu,L Wu,et al.Heterogeneous nucleation uniformizing cell size distribution in microcellular nanocomposites foams[J].Polymer,2006,47:7 580-7 589.
[2]龚维,何颖,张纯,等.二次开模距离对微发泡聚丙烯材料发泡行为的影响[J].塑料科技,2011,39(12):38-41.
[3]J A R Ruiz,J F Agassant,M Vincent,et al.Tuning the strucure of microcellular-injected polypropylene[J].Plastics Research Online,2015,DOI:10.2417/spepro.006075.
[4]张纯,罗筑,于杰,等.二次开模注射成型微孔发泡PP工艺及其性能研究[J].中国塑料,2005,19(8):67-70.
[5]Gong W,Gao J,Jiang M,et al.Influence of cell structure parameters on the mechanical properties of microcellular polypropylene materials[J].Journal of Applied Polymer Science,2011,122:2 907-2 914.
[6]A K Bledzki,O Faruk.Effects of the chemical foaming agents,injection parameters,and melt-flow index on the microstructure and mechanical properties of microcellular injection-molded wood-fiber/polypropylene composites[J].Journal of Applied Polymer Science,2005,97:1 090-1 096.
[7]W Zhai,J Yu,L Wu,et al.Heterogeneous nucleation uniformizing cell size distribution in microcellular nanocomposites foams[J].Polymer,2006,47:7 580-7 589.