• Elastomers and Composites
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• 제51권1호
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• pp.24-30
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• 2016

Sole in the footwear usually modified with foaming agent on the polymer resin to improve the lightweightness and crush-cushion effect. In this study, we investigated rheological properties for polymer resin filled with the different type and concentration of foaming agent, capsule type foaming agent and organo-chemical foaming agent, under the time sweep test. Curing times of each polymer resin with different kind of foaming agent are delayed than reference material (epoxy resin with curing agent). In case of adding capsule type foaming agent, however, there is appropriate concentration to reduce the curing time, relatively. When foaming agent is activated, foaming force inflates the sample in contrast to condensation force of curing and then axial normal force develop to the (+) direction. Interestingly, by increase concentration of foaming agent, there is a specific point to break down the axial normal force development. The reason for this phenomenon is that coalescence of foams induce the blocking of axial normal force development.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.22-23
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• 2016

This study analyzes the properties of foam according to the concentration of vegetable foaming agent that is used in traditional and mixed foaming agent of developing stage, and confirms how the foams influence foamed concrete by searching for properties of foamed concrete according to replacing ratio of vegetable foaming agent and mixed foaming agent. This is for the purpose of providing basic data for the use of foamed concrete through improvement on the problem such as unstability, falling in fluidity and the strength of existed foaming agent.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 추계 학술논문 발표대회
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• pp.247-249
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• 2011

Pre-foaming, one of the manufacturing way of foamed concrete, is influenced by foaming agent. When the foaming agent diluted with water, surface tension and viscosity are varied. Therefore, this study is reviewing the surface tension, viscosity and unit weight of foam by experimental factor such as foaming agent types(AES, AOS, VS FP) and foam agent dilution concentration (1, 3, 5%) and temperature of materials (5, 10, 20℃). As an expeimental result, the surface tension and viscosity slightly increased with increasing concentrations. Meanwhile, when increasing temperature, the viscosity has decreased. FP produce relatively stable foams only in case 3% or more, which produce unstable foams containing large amount of water content by decreasing only insignificant surface tension when diluted at concentration of 1%.

• 한국세라믹학회지
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• 제35권12호
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• pp.1280-1285
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• 1998

Foaming method is presented the preparation of porous materials from high-concentrated kaolin silica and flyash slurries. The slurries were foamed dried and sintered respectively. The porosity of sintered ma-terials was about 70-75% Mean pore-size was the range of 70-150$\mu\textrm{m}$ and pore structure was continuous Sodium lauryl sulfate anionic surfactant was used as a foaming agent. The foaming ability and the froth sta-bility were increased with increasing the concentration of the foaming agent. But the size of the constituent bubble of froth after foaming process was not affected by the concentration of the foaming agent. These results showed that the mean pore-size of sintered materials was closely related to the froth stability which is related to the change of bubble-size during the drying process.

• 콘크리트학회논문집
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• 제23권2호
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• pp.151-158
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• 2011

선발포 방식을 통해 제조되는 기포 콘크리트에서 기포는 밀도, 강도, 공극 등의 물리적 특성에 영향을 끼치는 주요인이다. 기포 콘크리트에 대한 연구가 꾸준하게 진행되었지만, 기포 자체의 특성에 관한 연구는 화학적인 분야를 제외하고는 거의 없는 실정이다. 그러므로 용도에 적합한 기포 콘크리트를 제조하기 위해서는 기포의 성상에 대한 연구가 필수적으로 선행되어야 한다. 기포 콘크리트의 제조에서 기포를 유효하게 이용하기 위해서는 기포의 특성을 평가해야만 한다. 이 연구에서는 기포의 특성을 알아보기 위해 기포제 종류 및 농도 변화에 따른 기포의 특성에 관한 검토를 수행하였다. 기포의 특성을 알아보기 위해 사용한 기포제는 계면활성제계, 수지비누계, 단백질계 기포제를 사용하였고 기포제의 농도는 기포제 종류에 따라 0.05~13% 범위로 설정하였다. 측정 항목은 발포율, 기포 용적, 수용액 용적, 기포 크기 및 분포를 측정하였다. 분석 결과, 기포제 종류와는 상관없이 기포제 농도가 높을수록 발포율은 증가하는 것으로 나타났고, 기포제 농도는 기포, 수용액 용적 변화, 기포 크기 분포에도 영향을 끼치는 것으로 나타났다. 기포의 안정성 측면에서 단백질계가 계면활성제, 수지비누계 보다 높은 안정성을 나타냈다. 기포의 형상에서는 계면활성제계, 수지 비누계는 다각형의 기포를, 단백질계는 구형의 기포를 형성하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 1부
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• pp.123-125
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• 2011

Pre-foaming that has been used in this study is using to control and guarantee quality, but the optimum mix proportion and regulation are not definite. Therefore, this study investigated properties of foamed concrete according to concentrations of foaming agent to improve usability of foamed concrete. Synthetic foaming agent such as AES(Alkyl Ether Sulfate) and AOS(Alpha Olefin Sulfonate) are used to make foam with 1, 3, and 5% concentrations. We found that the flow of foam concrete increases when foam concentration is high and AES is more flowable than AOS. Density and compressive strength increase when foam concentration is low.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.77-78
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• 2019

Organic insulating materials can cause fatal toxic gases when burned, which can lead to human injury. As a combustible material, the risk of fire spreading is great. Therefore, there is a need for a study on the lightweight cured body for the non-combustible inorganic insulation to replace the flammable organic insulation. This study aims to examine the properties of lightweight foamed concrete according to the dilution concentration of animal foaming agent which forms a closed void when foaming as a part of the experiment to examine the utility of the lightweight foamed concrete as an insulating material. Bubbles occupy a large volume of lightweight foam concrete and have a great influence on the properties. Therefore, the stability of the bubble is very important, and as a result of the experiment, it is determined that 3% of the smallest vesicles are prepared at the proper dilution concentration.

• 한국안전학회지
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• 제29권2호
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• pp.18-23
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• 2014

Foam extinguishing agent is widely used for extinguishing combustible liquid fires. Compared to other foam type extinguishing agents, protein foam has relatively low cost and low toxicity and produces stable foam blanket which is excellent in heat resistance and sealability, despite it has weak fluidity. Therefore the study investigated foaming characteristics followed by various factors affecting the fluidity of the protein foam extinguishing agent. The extinguishing characteristics differentiated by the changes in fluidity were also experimented. Foaming performance was compared by measuring the expansion ratio and the 25% drainage time. Moreover, the 25% drainage time and the extinguishing time was compared. The results showed that the 25% drainage time and the expansion ratio were increased as the pressure of nozzle and the concentration of hydrolyzed protein liquid enlarged. However the foaming and extinguishing performance were not improved when the condition exceeded certain level of pressure and concentration. The fastest fire extinguishing condition was the nozzle pressure 4bar with the 85wt.% of concentration of hydrolyzed protein liquid.

• 한국응용과학기술학회지
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• 제28권2호
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• pp.146-151
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• 2011

In this study, by using oleic acid and polypropylene glycol, good natured antifoaming agent for suitable electronics process under the alkaline conditions were synthesized. For the synthesized mono and diesters, acid value, hydroxyl value was measured, and identified by FT-IR and $^1H-NMR$ spectroscopy. Surface properties such as surface tension, critical micelle concentration(cmc) for diluted aqueous solution was measured, and tested the antifoaming properties according to the difference of alkyl chain length, various concentration, temperature and pH. The surface tension of synthesized antifoaming agent, PPMO(Polypropylene glycol monooleate) was 24.3 dyne/cm, PPDO(Polypropylene glycol dioleate) was 23.7 dyne/cm. By increasing of the alkyl chain length, surface tension was decreased slightly, and showed good antifoaming properties at 0.06 wt% concentration and $50^{\circ}C$, pH 11. These synthesized compounds are expected to apply as a suitable antifoaming agents in the semiconductor and the PCB(Printed Circuit Board) manufacturing process.

• Elastomers and Composites
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• 제45권4호
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• pp.272-279
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• 2010

전분은 친환경적인 천연자원이다. 건축 재료로서 활용 가능한 전분-아크릴 코팅졸을 유화중합으로 합성하였다. 제조된 합성물은 IR, $^1H$-NMR을 이용하여 구조를 분석하였고, X-ray Diffraction, 발포 시험, 백색도 시험, 광택도 시험과 인장 강도를 측정을 통하여 물리적 특성을 조사하였다. 전분-아크릴 폴리머 메트릭스에서 전분의 무정형 상태는 XRD결과로 알 수 있었다. 에멀젼을 60% $CaCO_3$ 수용액과 1%, 3%, 5% 발포제와 배합하였다. 그 결과 전분과 발포제의 양이 증가할수록 발포율이 증가하였다. 전분과 발포제의 양이 증가하면 인장 강도가 증가하였다. 그러나 전분과 발포제의 증가로 인해 백색도와 광택도는 감소하였다.