Influence of the Mixture Viscosity on Mechanical Anisotropy and Processability of an NBR-Based Rubber Mixture for Additive Manufacturing

IF 1.2 4区工程技术 Q4 POLYMER SCIENCE

Rubber Chemistry and Technology Pub Date : 2023-10-11 DOI:10.5254/rct-23.228315

Lion Sundermann, Benjamin Klie, Heike Wittek, Thomas Ebel, Kathrin Ottink, Ulrich Giese

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引用次数: 0

Abstract

ABSTRACT Rubber-based polymers with high carbon black content can be three-dimensionally (3D) printed using the additive manufacturing of elastomers process. However, high-viscosity materials limit printing resolution, making it difficult to produce fine structures and high-precision parts, especially two-component (2K) parts. The viscosity of a rubber compound used for rod seal applications was reduced and adjusted using Nipol® 1312 liquid rubber and the alkyl sulfonic phenyl ester Mesamoll® II as plasticizers to lower the torque level during extrusion when a reduced nozzle diameter of 0.4 mm is used in 3D printing. In addition, the flowability of the compound was enhanced prior to vulcanization of the part, which could increase the layer–layer bond and thus reduce the mechanical anisotropy typically induced by fused filament fabrication. Using a viscosity-optimized rubber compound, a 2K rod seal consisting of a thermoplastic polyurethane with elastomeric properties and an acrylonitrile rubber-based O-ring was produced and dynamically tested for leakage.

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混合料粘度对增材制造用nbr基橡胶混合料力学各向异性和加工性的影响

高炭黑含量的橡胶基聚合物可以使用弹性体增材制造工艺进行三维(3D)打印。然而，高粘度材料限制了打印分辨率，难以生产精细结构和高精度零件，特别是双组分(2K)零件。使用Nipol®1312液体橡胶和烷基磺酸苯基酯Mesamoll®II作为增塑剂，降低了用于杆密封应用的橡胶化合物的粘度，以降低挤压过程中的扭矩水平，当3D打印中使用减小的喷嘴直径为0.4 mm时。此外，在零件硫化之前，该化合物的流动性得到了增强，这可以增加层与层之间的结合，从而减少由熔融长丝制造引起的机械各向异性。采用一种粘度优化的橡胶化合物，生产了一种2K杆密封，该密封由具有弹性体性能的热塑性聚氨酯和丙烯腈橡胶基o型密封圈组成，并进行了泄漏动态测试。

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来源期刊

Rubber Chemistry and Technology 工程技术-高分子科学

CiteScore

3.50

自引率

20.00%

发文量

审稿时长

3.6 months

期刊介绍： The scope of RC&T covers: -Chemistry and Properties- Mechanics- Materials Science- Nanocomposites- Biotechnology- Rubber Recycling- Green Technology- Characterization and Simulation. Published continuously since 1928, the journal provides the deepest archive of published research in the field. Rubber Chemistry & Technology is read by scientists and engineers in academia, industry and government.