Fiber fracture of continuous glass fiber⁃reinforced polypropylene prepreg tapes during melt impregnation

doi:10.19491/j.issn.1001-9278.2022.06.011

Abstract

Abstract:

To improve the performance of prepreg tapes， a continuous?glass?fiber?reinforced polypropylene （PP/GF） prepreg tape was prepared using a melt impregnation method， and the impregnation process of continuous fiber bundle in the PP melt was investigated. A mathematical model of fiber fracture was established by means of the Weibull distribution function to predict the fiber fracture rate during the producing process of the prepreg tape and to describe the experimental results. The results indicated that the prediction results obtained from the model was in good agreement with the experimental data. This provides guidance for the industrial production. The fiber fracture was mainly influenced by the effect of resin melt on the fiber bundle in the mold as well as the friction between the fiber and the equipment. Through improving the mold temperature appropriately， reducing the fiber traction speed， and increasing the mold gap， the fiber breakage was reduced effectively and the process stability was improved.

Key words: melt impregnation, fiber fracture, prepreg tape, Weibull function, fracture model

CLC Number:

TQ325.1⁺4

LI Jie, XU Ran, REN Feng, YANG Yifei, XIN Chunling, HE Yadong. Fiber fracture of continuous glass fiber⁃reinforced polypropylene prepreg tapes during melt impregnation[J]. China Plastics, 2022, 36(6): 69-76.

Figures/Tables 17

Fig.1. Wedge zones in impregnation mold

Fig.2. Structure diagram of the wedge zone

Fig.3. Fiber bending during preparation

Fig.4. Delamination of fiber bundles

Fig.5. Preparation process of prepreg tapes

Fig.6. Rheological behavior of BX3920

温度/℃	$η 0$ /Pa·s	$λ$ /s	n
250	101.2	0.063 5	0.799
240	117.9	0.06 734	0.790 8
230	132.9	0.06 944	0.812 3
220	188.7	0.09 318	0.783 1
210	239.5	0.121 8	0.784 2
200	297.3	0.159 1	0.773 8

温度/℃	$η 0$ /Pa·s	$λ$ /s	n
250	101.2	0.063 5	0.799
240	117.9	0.06 734	0.790 8
230	132.9	0.06 944	0.812 3
220	188.7	0.09 318	0.783 1
210	239.5	0.121 8	0.784 2
200	297.3	0.159 1	0.773 8

Tab.1. Carreau model parameters of BX3920

Fig.7. Effect of dipping mold temperature on the degree of dipping of prepreg tapes

Fig.8. Effect of dipping mold temperature on the degree of fiber fracture rate of prepreg tapes

Fig.9. Effect of pulling speed on the degree of dipping of prepreg tapes

Fig.10. Effect of pulling speed on the degree of fiber fracture rate of prepreg tapes

Fig.11. Effect of pulling speed on tensile strength of prepreg tapes

Fig.12. SEM image of prepreg tapes

Fig.13. Effect of dipping mold gap on the degree of dipping of prepreg tapes

Fig.14. Effect of dipping mold gap on the degree of fiber fracture rate of prepreg tapes

Fig.15. Effect of dipping mold gap on tensile strength of prepreg tapes

Fig.16. SEM images of prepreg strips prepared under different mold gaps at the traction speed of 3 m/min

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