Investigation of the Fiber Length and the Mechanical Properties of Waste Recycled from Continuous Glass Fiber-Reinforced Polypropylene

IF 4.6 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Recycling Pub Date : 2023-10-24 DOI:10.3390/recycling8060082
Shiva MohammadKarimi, Benedikt Neitzel, Maximilian Lang, Florian Puch
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Abstract

This paper explores the mechanical recycling of continuous fiber-reinforced thermoplastics (CFRTPs) waste into injection molded products, focusing on the influence of recycling parameters on fiber length and mechanical properties. CFRTPs are gaining attention for their promising attributes, including weight-specific mechanical properties, short cycle times, storability, and recyclability, making them suitable for diverse applications. However, as CFRTP production rates rise, recycling strategies become crucial for sustainability. This study investigates the processability of CFRTP waste, defines size reduction conditions, and evaluates the impact of various compounding parameters such as temperature, screw speed, and fiber volume content during extrusion. The research findings indicate that higher screw speeds lead to fiber length reduction, whereas elevated temperatures result in longer fibers. Increased fiber volume intensifies interactions, resulting in shorter lengths. Additionally, the study examines the influence of injection molding parameters such as back pressure, screw speed, and initial fiber length on the resulting fiber length and mechanical properties of injection molded specimens, emphasizing the need for precise parameter control to optimize performance in recycled CFRTPs. Key findings are that increasing the initial fiber length from 260 μm to 455 μm results in an average fiber length after injection molding of 225 μm and 341 μm, respectively. This implies that longer initial fibers are more prone to breakage. Regarding the mechanical properties, increasing back pressure from 20 bar to 60 bar results in a reduction in Young’s modulus of approximately 40 MPa. Higher screw speed also reduces modulus by approximately 70 MPa due to intensified fiber–screw interactions. However, back pressure and screw speed have neutral effects on the tensile strength and the elongation at break.
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连续玻纤增强聚丙烯回收废料的纤维长度及力学性能研究
本文探讨了连续纤维增强热塑性塑料(CFRTPs)废料的机械回收利用到注塑制品中,重点研究了回收参数对纤维长度和力学性能的影响。cfrtp因其有前途的特性而受到关注,包括重量相关的机械性能、短循环时间、可储存性和可回收性,使其适用于各种应用。然而,随着CFRTP产量的上升,回收策略对可持续性至关重要。本研究考察了CFRTP废料的可加工性,确定了尺寸缩减条件,并评估了挤出过程中不同配比参数(如温度、螺杆转速和纤维体积含量)对CFRTP废料的影响。研究结果表明,螺旋转速越高,纤维长度越短,而温度越高,纤维长度越长。增加的纤维体积加强了相互作用,导致长度变短。此外,该研究还考察了注射成型参数(如背压、螺杆转速和初始纤维长度)对注射成型样品的最终纤维长度和机械性能的影响,强调需要精确的参数控制来优化回收cfrtp的性能。结果表明:将初始纤维长度从260 μm增加到455 μm,注射成型后的平均纤维长度分别为225 μm和341 μm;这意味着较长的初始纤维更容易断裂。在力学性能方面,将背压从20 bar增加到60 bar会导致杨氏模量减少约40 MPa。较高的螺杆转速还会由于纤维与螺杆之间的相互作用加剧而使模数降低约70 MPa。背压和螺杆转速对拉伸强度和断裂伸长率的影响为中性。
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来源期刊
Recycling
Recycling Environmental Science-Management, Monitoring, Policy and Law
CiteScore
6.80
自引率
7.00%
发文量
84
审稿时长
11 weeks
期刊最新文献
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