长玻纤增强聚丙烯流体辅助注塑管件的工艺影响

王佳敏; 匡唐清; 柳和生; 朱瑶瑶; 高聪

doi:10.13801/j.cnki.fhclxb.20230906.001

长玻纤增强聚丙烯流体辅助注塑管件的工艺影响

doi: 10.13801/j.cnki.fhclxb.20230906.001

1.
华东交通大学　机电与车辆工程学院，南昌330013
2.
江西联塑科技实业有限公司，南昌330100

基金项目: 国家自然科学基金 (52163006；52273033)；江西省重点研发计划 (20223BBE51012)；江西省自然科学基金重点项目(20232ACB204004)

详细信息

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

中图分类号: TQ320.66；TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2023-07-03
- 修回日期: 2023-08-08
- 录用日期: 2023-08-27
- 网络出版日期: 2023-09-07
- 刊出日期: 2024-05-15

Process effects of long glass fiber reinforced polypropylene fluid assisted injection molding pipes

1.
School of Mechanical & Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China
2.
Jiangxi Liansu Technology Industry CO., LTD., Nanchang 330100, China

Funds: National Natural Science Foundation of China (52163006; 52273033); The Key R&D Program of Jiangxi Province (20223BBE51012); Jiangxi Provincial Natural Science Foundation Key Program (20232ACB204004)

摘要

摘要: 采用气体辅助注塑工艺(GAIM)、气体驱动弹头辅助注塑工艺(G-PAIM)、水辅助注塑工艺(WAIM)和水驱动弹头辅助注塑工艺(W-PAIM)这4种工艺方法成型长玻纤增强聚丙烯(LGFR-PP)流体辅助注塑管件，对比研究各工艺方法对管件壁厚、玻纤断裂长度及玻纤取向的影响。结果表明：W-PAIM工艺管件壁厚最薄且壁厚均匀性最好，GAIM工艺管件壁厚最厚且壁厚均匀性最差；G-PAIM比WAIM管件壁厚均匀性更好，但WAIM管件壁厚更薄；4种工艺方法中玻纤断裂长度呈不均匀分布，平均玻纤断裂长度WAIM>GAIM>W-PAIM>G-PAIM，弹头的引入使玻纤断裂作用加剧，玻纤断裂长度更短；G-PAIM、WAIM和W-PAIM工艺中玻纤沿流动方向取向度由近模壁层到中间层再到近流道层呈现逐渐升高的趋势，GAIM玻纤取向杂乱无章；各工艺管件玻纤取向程度W-PAIM>WAIM>G-PAIM>GAIM。
- 长玻纤增强聚丙烯 /
- 流体辅助注塑 /
- 工艺方法 /
- 玻纤取向 /
- 玻纤断裂长度
Abstract: The long glass fiber reinforced polypropylene fluid-assisted injection molding pipes were molded by four processes: Gas-assisted injection molding process (GAIM), gas-projectile-assisted injection molding process (G-PAIM), water-assisted injection molding process (WAIM) and water-projectile-assisted injection molding process (W-PAIM). The effects of each process on the wall thickness, glass fiber fracture length and glass fiber orientation of the pipes were compared and studied. The results show that the wall thickness of the W-PAIM process pipes is the thinnest and most uniform, and the wall thickness of the GAIM process pipes is the thickest and most non-uniform. G-PAIM had better wall thickness uniformity than WAIM pipes, but WAIM pipes has thinner wall thicknesses. The glass fiber fracture lengths are unevenly distributed among the four process methods. The average glass fiber fracture length is ranked as WAIM>GAIM>W-PAIM>G-PAIM. The introduction of the projectile intensifies the glass fiber fracture effect, so that the glass fiber fracture length is shorter. In G-PAIM, WAIM and W-PAIM processes, the orientation of glass fibers along the flow direction tends to increase gradually from near the mold wall layer to the middle layer to near the runner layer, and the orientation of GAIM glass fibers is disorganized. The degree of glass fiber orientation of each process pipes is ranked as W-PAIM>WAIM>G-PAIM>GAIM.
- LGFR-PP /
- FAIM /
- process method /
- glass fiber orientation /
- glass fiber breakage length

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图 1 弹头结构示意图：(a)尺寸图；(b)实物图

$\phi $—Diameter

Figure 1. Schematic diagram of the projectile structure: (a) Dimensional drawing; (b) Physical picture

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图 2 管件壁厚测量：(a)管件测量位置(P1~P4)；(b)截面测量点(T1~T4)

Figure 2. Wall thickness measurement of pipes: (a) Measurement position of pipes (P1-P4); (b) Measuring points of each section (T1-T4)

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图 3 SEM 观测样品制备

Figure 3. Preparation of SEM observation samples

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图 4 SEM观测样品

Figure 4. SEM observation samples

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图 5 光学显微镜下的玻纤断裂长度

Figure 5. Fracture length of glass fiber under optical microscope

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图 6 4种工艺成型的管件不同位置的壁厚

GAIM—Gas-assisted injection molding process; G-PAIM—Gas-projectile-assisted injection molding process; WAIM—Water-assisted injection molding process; W-PAIM—Water-projectile-assisted injection molding process

Figure 6. Wall thickness at different positions of pipes molded by four processes

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图 7 4种工艺的壁厚标准偏差

Figure 7. Standard deviation of wall thickness by four processes

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图 8 4种工艺方法的玻纤断裂长度分布

Figure 8. Glass fiber breakage length distribution for four process methods

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图 9 4种工艺方法的平均玻纤断裂长度

Figure 9. Average glass fiber breakage length of four process methods

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图 10 4种工艺管件的SEM图像：(a) GAIM；(b) G-PAIM；(c) WAIM；(d) W-PAIM

Figure 10. SEM images of pipes molded by the four processes: (a) GAIM; (b) G-PAIM; (c) WAIM; (d) W-PAIM

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图 11 流体驱动弹头辅助注塑工艺(F-PAIM)穿透过程中的速度云图：(a) 水驱动弹头辅助注塑工艺(W-PAIM)；(b) 气体驱动弹头辅助注塑工艺(G-PAIM)

Figure 11. Velocity clouds during fluid-projectile-assisted injection molding (F-PAIM) penetration: (a) W-PAIM; (b) G-PAIM

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表 1 4种工艺方法成型的工艺参数

Table 1. Process parameters of the four process methods of molding

Process parameter	Value
Melt temperature/℃	240
Fluid injection delay time/s	4
Melt injection pressure/MPa	7
Fluid injection pressure/MPa	6
Mold temperature/℃	60
Pressure-holding time/s	10

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