생분해성 PLA-나노바이오실리카 복합재 사출성형 최적화
Optimization of Injection Molding of Biodegradable Polylactic Acid-Biosilica Composites
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
화학적 플라스틱 제품은 다양한 환경문제를 발생시키며, 소각 시 폐기물로 인한 탄소발생 증가로 인하여 생분해성 고분자와 같은 자연분해가 가능한 생분해성플라스틱 제품에 대한 관심이 증가하고 있다. 식물기반 PLA(poly lactic acid)는 낮은 유리전이 온도로 저온성형특성이 좋지 않아 압출방식을 이용한 일회용기 제품생산 등 매우 한정적으로 사용된다. 본 연구에서는 사출성형 공정을 이용한 생분해성 폴리머를 상용화를 위하여 바이오첨가제에 의한 PLA 폴리머 물성변화 및 사출성형 최적화 조건을 탐색하였다. 생분해성 PLA 복합재에 나노실리카를 첨가하여 PLA의 취성특성을 개선하고 수축률을 조정하였으며, 최적 사출성형을 위한 사출온도, 기계적 압력을 재설정하였다. 5wt% 나노실 리카를 첨가한 PLA 복합재는 순수 PLA에 비해 용융 흐름이 15% 감소하였으나, 인장 강도는 13% 높아지고, 굴곡 강도는 15.9% 상승하며, 충격 강도는 18.2% 향상되고, 경도는 40% 증가하여, 180-190도의 온도에서도 사출 성형이 가능한특성을 보였다. 사출조건 설정을 위하여 나노복합재의 성형 시뮬레이션 해석 프로그램 ‘Moldflow’를 이용한 공정조건설정과 러너와 핀게이트에 따른 제품 사출 성형 최적화 분석을 진행하였다. 나노실리카를 첨가하여 PLA 특성을 조절 하고 이에 따른 사출성형 공정을 최적화 함으로써 다양한 형태의 제품을 생산할 수 있을 것으로 전망한다.
Abstract
Plant-based biodegradable polylactic acid (PLA) polymers have limited applications, such as in the production of disposable products using the extrusion method. This restricted usability is due to their low glass transition temperature and poor low-temperature molding properties. In the present study, we investigated the changes in PLA polymer properties induced by bioadditives and optimized the conditions of extrusion molding to commercialize biodegradable polymers using an injection molding process. Compared to pure PLA, the constructed PLA composite with nanosilica showed a 15% reduction in melt flow; however, the tensile strength increased by 13%, flexural strength increased by 15.9%, impact strength improved by 18.2%, and hardness increased by 40%, enabling injection molding even at temperatures of 180-190 °C. The mold flow of the nanocomposite and optimization analysis of product injection molding were conducted using a runner and fingate.
참고문헌 (25)
- J. S. Bang, "Effect of Carprolactone Grafted Lignin Addition on Physico-Chemical Properties of Polycarprolactone Nanofiber", Korea Wood Engenering, 22(5), pp.26~ (2022)
- Y. M. Jung, "A poly(lactic acid)", calcium metaphosphate composite for bone tissue engineering, 2015, pp.26(32), 6314~6322
- S. Sagadevan, "Recent advancements in polymer matrix nanocomposites for bone tissue engineering applications", Journal of Drug Delivery Science and Technology, 82 (2023)
- J. H. Kim, "Miscibility and Thermal Behavior of Biodegradable Syntheric Aliphatic Polyester(Bionolle)and Poly(epichlorohydrin)Blends", Polymer(Korea), 24(3), pp.358~365 (2000)
- Lee, W. K, "Decomposition Mechanism of Biodegradable Polymers", Polymer Science and Technology, 13(1), pp.66~68 (2002)
- Kim, S. M, "Recent Trends in The Production of Polyhydroxyalkanoates Using Marine Microorganisms rea Expressway Corporation", Review, Journal of Life Science, 33(8), pp.680~691 (2023)[DOI]
- A Study on Marine Pollution ad Biological Impact by Microplastic, "Shim, W. J", Korea Ocean Research & Development Institute, ~ (2022)
- Lee, B. I, "Preparation amd Physical Properties of Biodegradable Poly(L-lactide)", Sillica Composites, 2008, pp.45(5), 269~275
- S. W. Son, "Synthesis and Characterization of Porous Poly caprolactone", Silica Nanocomposites, 2015, pp.39(2), 323~328
- C. H. Kim, "Surface Treatment of Silica Nnaoparticles and the Characteristics of their Composites with Thermoplastic Polyurethan Elastomer", Polymer(Korea), 36(6), pp.721~726 (2012)
- Harris, M. Angela, "Improving mechanical performance of injection molded PLA by controlling crystallinity", Journal of applied polymer science, 107(4), pp.2246~2255 (2008)
- T. Tábi, "Improving the ductility and heat deflection temperature of injection molded Poly(lactic acid)products : A comprehensive review", Polymer Testing, 101, pp.107~282 (2021)
- Yeh, J. T, "Study on the crystallization, miscibility, morphology, properties of poly(lactic acid)", poly(ε-caprolactone)blends, 2009, pp.48(6), 571~578
- Ankush M, "An explanatory study on defects in plastic molding parts caused by machine parameters in injection molding process", Materials Today Proceedings, 78, pp.656~661 (2023)
- Kazmer, D. O, "Applied plastics engineering handbook", pp.639~662 (2024), William Andrew Publishing
- J. H. Lee, "A Study on the Architecture of Artificial Neural Network Considering Injection-Molding Process Steps", Polymers, 15(23), pp.4578~ (2023)
- D. Annicchiarico, "Review of factors that affect shrinkage of molded part in injection molding", Materials and Manufacturing Processes, 29(6), pp.662~682 (2014)
- M. Tutar, "Computational study of the effect of governing parameters on a polymer injection molding process for single-cavity and multicavity mold systems", 132(1), pp.12~ (2010)
- Beaumont, J. P, "Runner and gating design handbook : tools for successful injection molding" (2019), Carl Hanser Verlag GmbH Co KG
- Hétu, J. F, "3D finite element method for the simulation of the filling stage in injection molding", Polymer Engineering & Science, 38(2), pp.223~236 (1998)
- İ. Karagöz, "Effect of melt temperature on product properties of injection-molded high-density polyethylene", Polymer Bulletin, 78(10), pp.6073~6091 (2021)
- S. Kashyap, "Process parameter optimization of plastic injection molding : a review", International Journal of Plastics Technology, 19(1), pp.1~18 (2015)
- Cakmak, O. K, "Biodegradable Polymers-a Review on Processing, and Degradation Mechanism", Review paper, Circular Economy and Sustainability (2023)[DOI]
- E. J. Jeong, "Fabrication of Microcellular Polylactide", Modified Silica Nanocomisite Foams, Hanyang University, 2018
- J. L. Tsai, "Characterizing mechanical properties of particulate nanocomposites using micromechanical approach", Journal of composite materials, 42(22), pp.2345~2361 (2008)