자동차 산업에서 폴리우레탄 폼은 흡·차음재, 단열재, 시트, 자운스 범퍼, 접착제 등 다양한 분야에 사용되고 있다. 폴리우레탄 소재는 폴리올과 이소시아네이트를 기본 단위체로 하는 ...
자동차 산업에서 폴리우레탄 폼은 흡·차음재, 단열재, 시트, 자운스 범퍼, 접착제 등 다양한 분야에 사용되고 있다. 폴리우레탄 소재는 폴리올과 이소시아네이트를 기본 단위체로 하는 고분자 소재로 합성방식에 따라 폼형태와 비폼 형태가 있다. 본 연구는 차량용 폴리우레탄 흡음재에 대한 연구로, 폴리올 시스템과 이소시아네이트의 화학 구조를 변화시키거나 다양한 무기필러를 첨가하여 폴리우레탄소재의 물성을 향상시키는 데에 그 목적을 두고 있다. 또한 기존 분진형태로 방출되던 촉매를 대체할 친환경 촉매를 이용하여 소재의 합성연구를 진행하였다. 먼저 몰드를 이용한 방식이 아닌 자유발포 폴리우레탄 폼의 셀 형태학 구조를 물과 수지화, 발포화 촉매의 양을 조절하여 그 상관관계를 밝혀내어, 시트 소재로서 요구되는 높은 toughness를 확보할 수 있었다. 또한, 몰드 폴리우레탄 폼 흡·차음재에 대한 연구로는, uretonimine이라는 변성 이소시아네이트의 함량을 조절시켜 우수한 흡음성능을 확보하였다. 또한 magnesium hydroxide, zinc borate, talc 등 다양한 무기 필러를 흡음재에 첨가시켜 우수한 흡음성능을 확보 할 수 있었다. 흡·차음재의 다양한 물성을 측정하기 위해 DMA, AFM, SEM, Impedance tube, UTM등 다양한 분석기기를 사용하였다.
자동차 산업에서 폴리우레탄 폼은 흡·차음재, 단열재, 시트, 자운스 범퍼, 접착제 등 다양한 분야에 사용되고 있다. 폴리우레탄 소재는 폴리올과 이소시아네이트를 기본 단위체로 하는 고분자 소재로 합성방식에 따라 폼형태와 비폼 형태가 있다. 본 연구는 차량용 폴리우레탄 흡음재에 대한 연구로, 폴리올 시스템과 이소시아네이트의 화학 구조를 변화시키거나 다양한 무기필러를 첨가하여 폴리우레탄소재의 물성을 향상시키는 데에 그 목적을 두고 있다. 또한 기존 분진형태로 방출되던 촉매를 대체할 친환경 촉매를 이용하여 소재의 합성연구를 진행하였다. 먼저 몰드를 이용한 방식이 아닌 자유발포 폴리우레탄 폼의 셀 형태학 구조를 물과 수지화, 발포화 촉매의 양을 조절하여 그 상관관계를 밝혀내어, 시트 소재로서 요구되는 높은 toughness를 확보할 수 있었다. 또한, 몰드 폴리우레탄 폼 흡·차음재에 대한 연구로는, uretonimine이라는 변성 이소시아네이트의 함량을 조절시켜 우수한 흡음성능을 확보하였다. 또한 magnesium hydroxide, zinc borate, talc 등 다양한 무기 필러를 흡음재에 첨가시켜 우수한 흡음성능을 확보 할 수 있었다. 흡·차음재의 다양한 물성을 측정하기 위해 DMA, AFM, SEM, Impedance tube, UTM등 다양한 분석기기를 사용하였다.
In modern automobiles, noise pollution is a critical issue, and polyurethane foam is common due to its high sound absorption and ease of production. For these reasons, polyurethane foams have attracted significant attention as sound absorption materials for automotive components.
Free-risin...
In modern automobiles, noise pollution is a critical issue, and polyurethane foam is common due to its high sound absorption and ease of production. For these reasons, polyurethane foams have attracted significant attention as sound absorption materials for automotive components.
Free-rising polyurethane foam In this chapter, two types of gelling catalysts were used in fabrications of polyurethane foams to control the cell morphology. The cell morphology of the free-rising polyurethane foams is explored with DBTDL and Dabco 33LV gelling catalysts, and the cell structures were analyzed from the samples obtained in various sampling heights and flow directions. The finer cell morphology was obtained with the DBTDL organotin type catalyst by the faster gelling reactivity, comparing with the Dabco 33LV amine type catalyst. In addition, the spherical small cavities in the samples obtained from horizontal planes in the free-rising foams revealed higher sound absorption coefficient and physical toughness than the elliptical irregular cavities from vertical planes, due to the higher homogeneity of cavity distributions in the horizontal planes.
Mold polyurethane foam Molecular structure of isocyanate components in the fabrication of the foams has a strong effect on the formations of interconnecting pores. Two competitive mechanisms of microphase separation and drainage flow in the polyurethane urea matrix determine the fractional ratio of closed, partially, and fully opened pores. This fractional ratio of pore types is crucial for the sound absorption efficiency of the final foam materials. The addition of modified isocyanate containing uretonimine linkages increases not only the microphase separation of hard domains in the matrix but also drainage flow in the cell wall. In addition, the decrease of toluene diisocyanate contents increases the phase separation of hard domains in polyurethane urea matrix. The optimum amount of uretonimine linkages in the isocyanate for good sound absorption is 4.310-5 mol/g, showing the highest amount of partially opened pore fraction. Foam properties were analyzed by Fourier transformed infrared spectroscopy, atomic force microscopy, and scanning electron microscopy. Sound absorption efficiency was analyzed with an impedance tube. Also, polyurethane composite foams are fabricated using inorganic fillers (Talc, Zinc Borate, and Aluminum Hydroxide), and the morphological and physical properties are assessed. The cavity and pore sizes of composite foams with hydrophobic fillers were smaller than those of foams with hydrophilic fillers due to differences in the cell collapsing phenomena. This difference in the surface properties of the filler also significantly affects the physical strength of the composite materials, and it is further related to the sound absorption efficiency of the foams. This sound absorption coefficient revealed the same trend with the loss modulus reflecting a measure of the dissipated energy between the polymer chains and fillers through microstructural deformations.
In modern automobiles, noise pollution is a critical issue, and polyurethane foam is common due to its high sound absorption and ease of production. For these reasons, polyurethane foams have attracted significant attention as sound absorption materials for automotive components.
Free-rising polyurethane foam In this chapter, two types of gelling catalysts were used in fabrications of polyurethane foams to control the cell morphology. The cell morphology of the free-rising polyurethane foams is explored with DBTDL and Dabco 33LV gelling catalysts, and the cell structures were analyzed from the samples obtained in various sampling heights and flow directions. The finer cell morphology was obtained with the DBTDL organotin type catalyst by the faster gelling reactivity, comparing with the Dabco 33LV amine type catalyst. In addition, the spherical small cavities in the samples obtained from horizontal planes in the free-rising foams revealed higher sound absorption coefficient and physical toughness than the elliptical irregular cavities from vertical planes, due to the higher homogeneity of cavity distributions in the horizontal planes.
Mold polyurethane foam Molecular structure of isocyanate components in the fabrication of the foams has a strong effect on the formations of interconnecting pores. Two competitive mechanisms of microphase separation and drainage flow in the polyurethane urea matrix determine the fractional ratio of closed, partially, and fully opened pores. This fractional ratio of pore types is crucial for the sound absorption efficiency of the final foam materials. The addition of modified isocyanate containing uretonimine linkages increases not only the microphase separation of hard domains in the matrix but also drainage flow in the cell wall. In addition, the decrease of toluene diisocyanate contents increases the phase separation of hard domains in polyurethane urea matrix. The optimum amount of uretonimine linkages in the isocyanate for good sound absorption is 4.310-5 mol/g, showing the highest amount of partially opened pore fraction. Foam properties were analyzed by Fourier transformed infrared spectroscopy, atomic force microscopy, and scanning electron microscopy. Sound absorption efficiency was analyzed with an impedance tube. Also, polyurethane composite foams are fabricated using inorganic fillers (Talc, Zinc Borate, and Aluminum Hydroxide), and the morphological and physical properties are assessed. The cavity and pore sizes of composite foams with hydrophobic fillers were smaller than those of foams with hydrophilic fillers due to differences in the cell collapsing phenomena. This difference in the surface properties of the filler also significantly affects the physical strength of the composite materials, and it is further related to the sound absorption efficiency of the foams. This sound absorption coefficient revealed the same trend with the loss modulus reflecting a measure of the dissipated energy between the polymer chains and fillers through microstructural deformations.
주제어
#polyurethane foam sound absorption material free-rising mold inorganic filler
학위논문 정보
저자
성기욱
학위수여기관
서울시립대학교
학위구분
국내석사
학과
화학공학과
발행연도
2018
총페이지
v, 105 p.
키워드
polyurethane foam sound absorption material free-rising mold inorganic filler
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