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在微孔注射成型工艺中用聚丙烯和超临界氮气对玻璃纤维织物进行直接模内浸渍

Direct In-Mold Impregnation of Glass Fiber Fabric by Polypropylene with Supercritical Nitrogen in Microcellular Injection Molding Process.

作者信息

He Qichao, Yang Weimin, Wang Jian, Ren Feng, Wang Da, Li Fuhai, Shi Zhonghe

机构信息

College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.

出版信息

Polymers (Basel). 2023 Feb 10;15(4):875. doi: 10.3390/polym15040875.

DOI:10.3390/polym15040875
PMID:36850159
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9960510/
Abstract

Combining microcellular injection molding and insert injection molding, an injection molding technique for glass fiber fabric (GFF) reinforced polypropylene (PP) composite foams was proposed. The GFF was directly set in the mold cavity, and then the PP with supercritical nitrogen (SCN) was injected into the cavity for in-mold impregnation. The impregnation effects of two types of GFFs (EWR300 and EWR600) by the PP/SCF solutions at different injection temperatures (230, 240, and 250 °C) were investigated. The results of the morphological and tensile properties of the samples showed that the interfacial bonding was not good, because of the heterogeneity between the GFF and PP. In comparison with solid PP, the unfoamed GFF/PP did not present a higher tensile strength and presented a lower specific tensile strength. However, the increased tensile strength of the GFF/PP composite foams indicated an improvement in the impregnation effect and interfacial bonding. The SCN decreased the viscosity, which benefited the direct in-mold impregnation of the GFF. Increasing the temperature can improve the interfacial bonding, but it also influenced the foaming and thus led to a decrease in the tensile strength. According to the temperature distribution, the samples from different positions in the mold cavity had different properties.

摘要

结合微孔注塑成型和嵌件注塑成型，提出了一种用于玻璃纤维织物（GFF）增强聚丙烯（PP）复合材料泡沫的注塑成型技术。将GFF直接放置在模具型腔中，然后将含有超临界氮气（SCN）的PP注入型腔中进行模内浸渍。研究了在不同注射温度（230、240和250℃）下，两种类型的GFF（EWR300和EWR600）被PP/SCF溶液浸渍的效果。样品的形态和拉伸性能结果表明，由于GFF和PP之间的不均匀性，界面结合不好。与实心PP相比，未发泡的GFF/PP没有表现出更高的拉伸强度，且比拉伸强度更低。然而，GFF/PP复合泡沫材料拉伸强度的提高表明浸渍效果和界面结合有所改善。SCN降低了粘度，这有利于GFF的直接模内浸渍。提高温度可以改善界面结合，但也会影响发泡，从而导致拉伸强度下降。根据温度分布，模具型腔中不同位置的样品具有不同的性能。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/5269b926b765/polymers-15-00875-g015.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/f80e7eca97ff/polymers-15-00875-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/2dff2012c16c/polymers-15-00875-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/237adb4c7369/polymers-15-00875-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/7121a605dc34/polymers-15-00875-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/ea7daf0354f8/polymers-15-00875-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/a97581dc4918/polymers-15-00875-g007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/964e5b0484f5/polymers-15-00875-g010a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/7812d781551b/polymers-15-00875-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/04b57e24725e/polymers-15-00875-g014.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/05ef/9960510/5269b926b765/polymers-15-00875-g015.jpg

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