The influence of calcium carbonate and its modifications on the extrusion process and selected functional properties of polypropylene cast films

IF 1.1 4区工程技术 Q4 POLYMER SCIENCE

Polimery Pub Date : 2022-11-17 DOI:10.14314/polimery.2022.10.6

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引用次数: 0

Abstract

The purpose of the article was to determine the influence of calcium carbonate and its modification (with stearic acid) on selected properties of composite polypropylene films and their processing. Polypropylene composites containing, respectively, 5, 10, 20 and 30 wt% filler, were made in twin-screw extrusion process with cold granulation. Films, on the other hand, were produced in single-screw extrusion process (an extruder with a screw with diameter d = 20 mm and ratio l/d = 24) using a flat head (so-called cast films) and a chill roll type cooling and pull-back device. The pull-back rotational speed was selected so as to obtain films of a thickness of approx. 120 µm, irrespectively of the composite being processed. The assessment of the effect of the addition of applied fillers on the magnitude of the melt volume-flow rate (MVR) of polypropylene and the processing characteristic of extrusion process was made (the flow resistance and the variations in volumetric flow rate were determined). It was demonstrated how variations in the processability of polymeric material determined the correction of extrusion process setup parameters (pull-back system speed). The processability of composite films under extensional flow conditions was also determined by evaluating the extensional viscosity (ηE) of the composites. The strength values of composite films were determined under static tension conditions and in puncture tests. The effect of the content and modification of CaCO3 on the film haze and gloss was also assessed. The investigation carried out has demonstrated a direct effect of the addition of calcium carbonate and its modification on the processability and selected functional properties of composite films. The study has also proved that stearic acid is an effective modifier of processing properties, not only in shear flow conditions, but also under extensional flow conditions – smaller ηE values are exhibited by films containing modified calcium carbonate.

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研究了碳酸钙及其改性剂对聚丙烯铸膜挤出工艺及功能性能的影响

本文的目的是确定碳酸钙及其改性(硬脂酸)对复合聚丙烯薄膜的选定性能及其加工的影响。采用双螺杆冷造粒挤压法制备了填充量分别为5%、10%、20%和30%的聚丙烯复合材料。另一方面，薄膜是在单螺杆挤压过程中生产的(螺杆直径d = 20 mm，比l/d = 24的挤出机)，使用平头(所谓的铸膜)和冷辊式冷却和回拉装置。选择回拉转速，得到的薄膜厚度约为。120µm，与所加工的复合材料无关。评价了外加填料的加入对聚丙烯熔体体积流率(MVR)的大小和挤出工艺特性的影响(确定了流动阻力和体积流率的变化)。演示了聚合物材料可加工性的变化如何决定挤出工艺设置参数的修正(回拉系统速度)。通过评价复合材料的拉伸粘度ηE，确定了复合材料薄膜在拉伸流动条件下的可加工性。在静态拉伸条件下和穿刺试验中测定了复合膜的强度值。评价了CaCO3的含量和改性对膜雾度和光泽度的影响。研究表明，碳酸钙的加入及其改性对复合薄膜的加工性能和选定的功能性能有直接影响。研究还证明，硬脂酸是一种有效的工艺性能调节剂，不仅在剪切流动条件下，而且在拉伸流动条件下，含有改性碳酸钙的薄膜的ηE值都较小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polimery Materials Science-Polymers and Plastics

CiteScore

2.90

自引率

6.20%

发文量

审稿时长

1 months

期刊介绍： The "Polimery" journal, of international circulation, is publishing peerreviewed scientific and technical research papers covering polymer science and technology in the field of polymers, rubbers, chemical fibres and paints. The range of topics covered are raw materials, polymer synthesis, processing and applications of polymers. Apart from scientific and technical research papers the monthly includes technical and commercial information such as reports from fairs and exhibitions as well as home, world and technical news. “Polimery "- an international journal covering the following topics: polymers, rubber, chemical fibres and paints. The Journal is addressed to scientists, managers and engineering staff of universities, Polish Academy of Sciences, R&D institutions, industry, specializing in polymer chemistry, physical chemistry, technology and processing. “Polimery” publishes original, reviewed research, scientific and technology papers in the field of polymer synthesis, analysis, technology and modification, processing, properties, applications and recycling.