玻纤质量分数对短玻纤增强聚丙烯水辅助共注塑管件的影响

匡唐清; 朱瑶瑶; 柳和生; 赖家美; 钟罗浩

doi:10.13801/j.cnki.fhclxb.20211101.001

玻纤质量分数对短玻纤增强聚丙烯水辅助共注塑管件的影响

doi: 10.13801/j.cnki.fhclxb.20211101.001

1.
华东交通大学　机电与车辆工程学院，南昌 330013
2.
南昌大学　机电工程学院，南昌 330031

基金项目: 国家自然科学基金(51763016)；江西省科技厅重点研发计划项目(20203BBE53065)；江西省自然科学基金(20181BAB206014)

详细信息

通讯作者:
柳和生，博士，教授，博士生导师，研究方向为聚合物成型工艺　E-mail：hsliu@ecjtu.edu.cn

中图分类号: TQ320.66
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出版历程
- 收稿日期: 2021-08-17
- 修回日期: 2021-10-10
- 录用日期: 2021-10-24
- 网络出版日期: 2021-11-02
- 刊出日期: 2022-08-22

Effect of glass fiber mass fraction on the water assisted co-injection molding pipes of short glass fiber reinforced polypropylene

1.
School of Mechanical & Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China
2.
School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China

摘要

摘要: 水辅助共注塑成型技术(Water-assisted co-injection molding，WACIM)是一种结合共注塑技术和水辅助注塑技术的新型注塑工艺。特定的工艺过程使得玻纤增强复合材料应用于WACIM工艺时具有特定的玻纤取向规律和增强特点。以纯聚丙烯(PP)为内层材料、不同质量分数的短玻纤增强聚丙烯(GF/PP)为外层材料制备系列WACIM管件，比较分析了实验条件下玻纤质量分数对管件壁厚、玻纤取向分布及拉伸强度的影响规律与机制。研究发现在玻纤质量分数不超过30wt%时，管件壁厚差异不明显，当玻纤质量增加到40wt%时，管件内外壁厚均增大；WACIM管件外层按玻纤取向的分布特点均可分为近界面层、中间层和近模壁层，玻纤沿流动方向的取向程度由内向外依次降低；管件的拉伸性能随着玻纤质量分数的增加呈先增后减的趋势，玻纤质量分数为30wt%时管件拉伸强度最好。与玻纤增强聚丙烯的水辅助注塑成型(WAIM)管件比较，发现两种工艺中玻纤质量分数对壁厚、玻纤取向分布和拉伸强度的影响有差异，影响机制有所区别。
- 短玻纤增强聚丙烯 /
- 水辅共注 /
- 玻纤质量分数 /
- 取向 /
- 拉伸强度
Abstract: Water-assisted co-injection molding (WACIM) technology is an novel injection molding process that combines co-injection molding technology and water-assisted injection molding technology. Its special process makes the glass fiber reinforced composite used in the process have special characteristics of fiber orientation and enhancement. WACIM pipes with polypropylene (PP) as inner material and short glass fiber reinforced polypropylene (GF/PP) as outer material were prepared to investigate the effects of glass fiber mass fraction on the thicknesses of pipe inner and outer layers, glass fiber orientation and tensile strength. It is found that when the mass fraction of glass fiber is less than 30wt%, the variations of pipe inner and outer layer thicknesses are not obvious. When the mass fraction of glass fiber increases to 40wt%, both the inner and outer layer thicknesses of pipe increase. According to the distribution characteristics of glass fiber orientation, the outer layer of WACIM pipes can be divided into three layers: Near interface layer, intermediate layer and near mold wall layer. The orientation degree of glass fiber along the flow direction decreases from inside to outside. The tensile properties of pipes increased first and then decreased with the increase of glass fiber mass fraction. The highest tensile strength of pipes can be obtained when the glass fiber mass fraction is 30wt%. It is found by comparison that the influences of glass fiber mass fraction on thickness, glass fiber orientation and tensile strength of WACIM and water-assisted injection molding (WAIM) pipes are different, and the influence mechanism are different.
- short glass fiber reinforced polypropylene /
- water-assisted co-injection molding /
- mass fraction of glass fiber /
- orientation /
- tensile strength

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图 1 玻纤增强聚丙烯(GF/PP)水辅助共注塑(WACIM)管件 (a) 及其残余壁厚测量 (b)

Figure 1. Glass fiber reinforced polypropylene (GF/PP) water-assisted co-injection molding (WACIM) pipe (a) and measurement of its residual wall thickness (b)

P1-P4—Section positions of residual wall thickness measurement; T1-T4—Measurement positions of residual wall thickness

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图 2 SEM样品制备方法

Figure 2. Preparation of SEM samples

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图 3 SEM观测样品

Figure 3. Sample of SEM observation

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图 4 WACIM管件拉伸试样

Figure 4. Tensile specimen of WACIM pipe

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图 5 玻纤质量分数对GF/PP管件壁厚的影响

Figure 5. Effect of glass fiber mass fraction on GF/PP pipe wall thickness

WAIM—Water assisted injectionmolding

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图 6 10wt%GF/PP WACIM管件的SEM图像：(a) 总壁厚层；(b) 外层近界面层；(c) 外层中间层；(d) 外层近模壁层

Figure 6. SEM images of 10wt%GF/PP WACIM pipe: (a) Total wall thickness layer; (b) Near interface of outer layer; (c) Middle of outer layer; (d) Near mold wall of outer layer

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图 7 20wt%GF/PP WACIM管件的SEM图像：(a) 总壁厚层；(b) 外层近界面层；(c) 外层中间层；(d) 外层近模壁层

Figure 7. SEM images of 20wt%GF/PP WACIM pipe: (a) Total wall thickness layer; (b) Near interface of outer layer; (c) Middle of outer layer; (d) Near mold wall of outer layer

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图 8 30wt%GF/PP WACIM管件的SEM图像：(a) 总壁厚层；(b) 外层近界面层；(c) 外层中间层；(d) 外层近模壁层

Figure 8. SEM images of 30wt%GF/PP WACIM pipe: (a) Total wall thickness layer; (b) Near interface of outer layer; (c) Middle of outer layer; (d) Near mold wall of outer layer

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图 9 40wt%GF/PP WACIM管件的SEM图像：(a) 总壁厚层；(b) 外层近界面层；(c) 外层中间层；(d) 外层近模壁层

Figure 9. SEM images of 40wt%GF/PP WACIM pipe: (a) Total wall thickness layer; (b) Near interface of outer layer; (c) Middle of outer layer; (d) Near mold wall of outer layer

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图 10 GF/PP WACIM管件近模壁层的玻纤取向演变

Figure 10. Evolution of glass fiber orientation near the outer mold wall of GF/PP WACIM pipe

a-e, a'-e'—Five fiber samples’ initial states and their final states

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图 11 GF/PP WACIM管件近界面层的玻纤取向演变

Figure 11. Orientation evolution of glass fiber near the outer interface of GF/PP WACIM pipe

f-i, f'-i'—Four fiber samples’ initial states and their final states

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图 12 玻纤质量分数对不同工艺下GF/PP管件拉伸强度的影响

Figure 12. Effect of glass fiber mass fraction on tensile strength of GF/PP pipe by different processes

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表 1 GF/PP WACIM管件制备工艺参数

Table 1. Processing parameters used to produce the test GF/PP WACIM samples

Process parameters	Value
Outer melt temperature/℃	250
Inner melt temperature/℃	210
Inner melt injection pressure/MPa	7
Inner melt injection delay time/s	3
Water injection delay time/s	4
Water injection pressure/MPa	6
Mold temperature/℃	25
Holding time/s	4

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