Adaptation of the Direct Reaction Injection Molding Process for Production and Processing of Long FiberReinforced Thermosets (LFD-Injection Molding Process) to the use of carbon fibers instead of glass fibers
用于生产和加工长纤维增强热固性材料的直接反应注塑工艺(LFD 注塑工艺)采用碳纤维代替玻璃纤维
基本信息
- 批准号:400343062
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2018
- 资助国家:德国
- 起止时间:2017-12-31 至 2021-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Fiber reinforced phenolic molding resins are among the oldest engineering polymers and are very versatile due to their advantageous properties. In addition to good thermo-mechanical properties, they have excellent media resistance and high dimensional stability. They are typically processed by injection molding. In contrast to thermoplastics, components made from phenolic molding compounds exhibit a low elongation at break and a low impact strength. These disadvantageous material properties restrict the use of fiber-reinforced phenolic resins in numerous applications. The project "LFD injection molding process" investigated the extent to which these disadvantages can be mitigated by increasing the fiber length in the molded part. The scope of the current project is to find out how the property profile of long fiber reinforced phenolic molding compounds can further be improved by using long carbon fibers (LCF) instead of long glass fibers (LGF). This will be realized by a variable feeding of the LCF into the injection molding process. To achieve this, the differences between LGF and LCF in terms of cutting, feeding and homogenization of the fibers are to be determined. In parallel, analysis methods already established for glass fibers will be adapted to carbon fiber-reinforced phenolic resins.Within the scope of the project, suitable carbon fibers and phenolic resins will be selected for the LFD process and compounded to short fiber molding compounds by twin screw extrusion. The moldability of the compounds will be ensured with the aid of calorimetric (DSC), rheological (oscillatory rheology) and typical at-line quality assurance methods (Orifice Flow Test OFT). To reliably evaluate the effects of different material and process parameters on the fiber length distribution, a valid and reproducible measurement method is required. For this reason, a measurement method that was developed for glass fibers will be adapted and validated for carbon fibers as well. The method is based on the pyrolytic removal of the matrix, followed by automated image evaluation of an aqueous fiber suspension. The existing LFD process technology will be adapted to the use of carbon fibers with as little changes as possible , so that the process designs for glass and carbon fibers will be comparable. The incorporation quality of the carbon fibers into the phenolic resin will be characterized by evaluating the opposing effects of (undesired) fiber shortening and (required) fiber dispersion. Fiber length measurements and computer tomographic evaluations will be used for this purpose. Finally, the aim of the project is to draw together the results of the previous work and to derive the process-structure-property relationship for the molding compounds and components produced.
纤维增强酚醛成型树脂是最古老的工程聚合物之一,由于其优越的性能,用途非常广泛。除了良好的热机械性能外,它们还具有优异的耐介质性和高尺寸稳定性。它们通常是通过注射成型加工的。与热塑性塑料相比,由酚醛成型化合物制成的部件具有低断裂伸长率和低冲击强度。这些不利的材料特性限制了纤维增强酚醛树脂在许多应用中的使用。“LFD注射成型工艺”项目研究了在多大程度上可以通过增加成型部件中的纤维长度来减轻这些缺点。当前项目的范围是找出如何通过使用长碳纤维(LCF)代替长玻璃纤维(LGF)来进一步改善长纤维增强酚醛模塑化合物的性能。这将通过LCF在注射成型过程中的可变进料来实现。为了实现这一目标,需要确定LGF和LCF在纤维切割、进料和均质方面的差异。同时,已经为玻璃纤维建立的分析方法将适用于碳纤维增强酚醛树脂。在项目范围内,将选择合适的碳纤维和酚醛树脂进行LFD工艺,并通过双螺杆挤压复合成短纤维成型化合物。通过量热法(DSC)、流变学(振荡流变学)和典型的在线质量保证方法(Orifice Flow Test OFT)来确保化合物的可塑性。为了可靠地评估不同材料和工艺参数对纤维长度分布的影响,需要一种有效的、可重复的测量方法。因此,为玻璃纤维开发的测量方法也将适用于碳纤维并进行验证。该方法基于对基质的热解去除,然后对含水纤维悬浮液进行自动图像评估。现有的LFD工艺技术将以尽可能少的变化适应碳纤维的使用,因此玻璃和碳纤维的工艺设计将具有可比性。碳纤维掺入酚醛树脂的质量将通过评价(不希望的)纤维缩短和(需要的)纤维分散的相反影响来表征。为此将使用纤维长度测量和计算机层析成像评价。最后,该项目的目的是将先前工作的结果汇总在一起,并推导出所生产的成型化合物和组件的工艺-结构-性能关系。
项目成果
期刊论文数量(0)
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Dr.-Ing. Wilfried Liebig, since 9/2022其他文献
Dr.-Ing. Wilfried Liebig, since 9/2022的其他文献
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