• 한국응용과학기술학회지
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• 제12권2호
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• pp.51-58
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• 1995

To prepare a durable softening water repellent, quaternized octadecyl methacrylate-2-diethyl-aminoethyl methacrylate as a mother resin and quaternized 1, 3-dioctadecyl-2, 7-dioxy-6, 8-di(2-hydroxyethyl)-1, 3, 6, 8-tetraazacyclodecane which increase the softening effect and the hydrostatic pressure blended with waxes and their emulsifier in various proportions to give water repellent PADWC. As the results of the measurement of water repellency, washable, tear strength and crease recovery to polyestercotton(P/C) blended fabrics treated with PADWC only or addition of textile finishing resin, the physical properties were increased. There was no significant lowering effect in water repellency when PADWC was treated the antistatic agent by the one-bath method, and the effect of water repellency by the adding the catalyst was studied. PADWC was confirmed as durable water repellent with the results of making little difference of water repellency as ${\pm}5$ point after and before washing.

• 펄프종이기술
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• 제45권2호
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• pp.13-20
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• 2013

In this study, two biodegradable polymer(PLA, PBS) emulsions were treated on agricultural packaging paper such as fruit bagging paper. Water-repellency, mechanical properties, and SEM image with thermal aging were measured on the emulsion treated fruit bagging paper. Biodegradable polymers(such as poly lactic acid, poly butylene succinate) emulsion treated fruit bagging paper had higher water-repellency and strength than other water-repellent(such as acrylic repellent, linseed oil and paraffin wax) treated fruit bagging paper. According to FE-SEM results of polymer emulsion coated fruit bagging paper, the colloidal particles of emulsion after thermal treatment (looks like being) were adhered to the fibers. Thus, using biodegradable polymer emulsion is expected to protect a fruit for a long time.

• Journal of the Korean Wood Science and Technology
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• 제44권4호
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• pp.494-504
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• 2016

Eucalyptus oils are widely used as spices, perfume industrial materials, food flavorings, and medicines. Several types of Eucalyptus oils also have insecticidal activity and as carminative. This study investigated the chemical composition, insecticidal (larvicidal and repellent) activity of E. urophylla oil against filarial mosquito Culex quinquefasciatus. E. urophylla oil was obtained from fresh leaves by water-steam distillation with oil yield 1.08%. E. urophylla oil in this study had no color (clear), has odor (typical eucalyptus), with specific gravity 0.941; refractive index 1.465; miscibility in 70% ethanol 1 : 3; and optical rotation (-) $5.83^{\circ}$. The major compounds of the oil were ${\alpha}$-pinene (11.73%), 1,8-cineole (49.86%), ${\beta}$-ocimene (6.25%), ${\gamma}$-terpinene (9.11%), and ${\alpha}$-terpinyl acetate (7.63%). The result showed the excellent insecticide activity against C. quinquefasciatus. The oil provided larvicidal activity with $LC_{50}$: 80.21 ppm and $LC_{90}$: 210.18 ppm, and repellent activity with $IC_{50}$: 0.82% and $IC_{90}$: 4.88%. The present study showed the effectiveness of E. urophylla as natural insecticide against C. quinquefasciatus, the mosquito vector of filariasis.

• 한국의류산업학회지
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• 제22권1호
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• pp.112-118
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• 2020

This paper examined the water repellency, water proofing and water vapor permeability of twelve types of woven fabrics for sports wear clothing. Their physical properties were compared and discussed with the fabric structural parameters and surface finishing effect. A water repellent property of 100% was obtained in the coated or laminated water repellent finished fabrics; in addition, cotton/nylon breathable composite fabrics treated with a laminated finishing and with low fabric density showed a 90% water repellency. Water proofing fabric above 6,000 mm H₂O hydraulic pressure was achieved by coated or laminated finishing; however, high density fabric or medium-level coated fabrics exhibited 100% water repellent and low water proofing characteristics. Superior water vapor permeability characteristics with good water repellency and proofing properties were achieved at the 2.5 layered low density and with 0.7 - 0.9 cover factor nylon fabrics treated with hydrophilic laminated finishing. The regression analysis for examining the effects of fabric structural parameters and surface finishing such as coating and laminating to the water vapor permeability exhibited a high determination coefficient of fabric structural parameters of 63.5%; in addition,, main factors among fabric structural parameters appeared to be cover factor and fabric thickness per weight. Coating and Laminating factors exhibited determination coefficient of water vapor permeability parameters of 36.5%.

• Macromolecular Research
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• 제17권9호
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• pp.666-671
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• 2009

Water repellent elastomeric surfaces were fabricated successfully on SBS/MWNT nanocomposites films using the breath figure method and subsequent thermal treatment. The uniformly dispersed CNTs were found to play significant roles in tuning the size and ordering of the macroporous morphology at the nanocomposite surface as well as enhancing the mechanical properties of nanocomposites. In particular, the CNTs dispersed in a nanocomposite solution retarded the coarsening process of aqueous droplets during the breath figure process and decreased the pore size in the finally fabricated film. The water contact angle measurement showed that the double-scale structure comprised of self-organized macropores and surface the roughness induced by a thermal treatment produced a highly water-repellent nanocomposite surface.

• 한국염색가공학회지
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• 제17권6호
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• pp.27-35
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• 2005

Conventional pad- dry-cure(thermo-fixation) process usually produces functional performance on both sides of a fabric. UV curing technique was applied to impart water- and oil-repellent finish effective only on the face of a PET knitted fabric. The preferential one-side coating, by virtue of the limited penetration of UV light, was achieved by W curing after padding of a fluorocarbon agent without special coating or printing equipments. The difference in the functional property of face and back sides was examined by measuring water and oil repellency at each side of the treated fabric. The influence of pre/post-irradiation dose and agent concentration on the performance of the finished fabrics were investigated. While increase in both resin concentration and post-irradiation did not have significant effect on the finish, UV pre-irradiation of PET fabrics caused remarkable influence presumably due to appropriate surface modification of PET fabrics required for facile wetting of the resin. The dimensional stability and color change of the UV cured fabrics measured by FAST and reflectance spectrophotometry showed significantly decreased color difference and increased percent extension compared with the samples pre-irradiated without agent application.

• 한국염색가공학회지
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• 제30권4호
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• pp.275-287
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• 2018

In recent years, research on the development of eco-friendly synthetic suede based on water-dispersed polyurethane resin and non-fluorine water repellent has been conducted. Synthetic suede has a problem that the fastness to dyeing is greatly lowered after the water-repellent processing at a high temperature of $160^{\circ}C$ because the polyester is dyed with a disperse dye. Therefore, in this study, silica was added to water-dispersed polyurethane resin to improve dye fastness. To distribute the $PUD-SiO_2$ mixture evenly in the water-dispersed polyurethane resin, sufficient stirring was done for a period of time. When the $PUD-SiO_2$ mixture(PUD 1-5%) is applied to the substrate, it is confirmed through SEM that the mixture is uniformly applied without particle condensation. The results showed that silica with a diameter of 4~12nm and BET of $200{\sim}380g/m^2$ had the ability to improve dispersibility and fastness.

• 한국컴퓨터정보학회논문지
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• 제28권12호
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• pp.97-104
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• 2023

본 논문은 지향성 스피커를 이용한 유해조류 퇴치 시스템을 제안한다. 유해조류 퇴치를 위한 기존 사운드 시스템은 소음공해로 인한 문제와 단조로운 소리로 인하여 조류의 학습효과로 효과성이 저하되는 단점을 가진다. 본 논문에서는 지향성 스피커를 이용하여 주변의 소음을 최소화하고 스피커 구동 장치에 대해 상하 및 좌우 각도를 자유롭게 하여 활용성을 극대화하였다. 또한 다양한 스캐닝 패턴을 이용하여 학습효과로 인한 성능저하 문제를 해결하였다. 향후, 원격제어 기능과 조류 종류를 인식할 수 있는 딥러닝 모델을 적용하여 중앙통제가 가능한 플랫폼으로 발전시키고자 한다.

• 한국응용곤충학회지
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• 제60권3호
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• pp.315-322
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• 2021

충북 청주지역에서 채집된 작은소피참진드기(Haemaphysalis longicornis)에 대하여 다양한 식물체 메탄올 조추출물과 천궁유래 물질들을 이용하여 살비활성과 기피활성을 조사하였다. 총 24종의 식물추출물을 이용한 작은소피참진드기에 대한 살비활성을 조사한 결과, 천궁(Cnidium officinale)에서 93.3%의 살비율로 가장 높은 활성을 보였으며, 기피 효과의 경우 도라지, 미국자리공, 백목련, 어성초, 천궁, 칡잎 등에서 통계적으로 유의미한 차이를 보였다. 기피 및 살비활성이 가장 높은 천궁의 메탄올추출물을 용매 분획한 물질들과 천궁 유래물질인 butylidenephthalide의 활성을 비교한 결과, 헥산(hexane)층 처리 3일 후에 90%의 높은 살비효과를 보였으며 기피반응도 통계적으로 유의미한 차이를 보였다. 천궁유래물질인 butylidenephthalide은 처리 7일 후에 90%의 살비활성을 보였고 T-tube olfactometer 실험에서 모든 작은소피참진드기가 무처리구로 이동하여 기피활성이 있음을 알 수 있었다. 따라서 본 연구결과는 천궁 조추출물과 천궁유래물질인 butylidenephthalide를 이용하여 작은 소피참진드기의 방제 개발에 기초자료로 활용될 수 있을 것으로 생각된다.

• 한국건축시공학회지
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• 제21권1호
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• pp.31-39
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• 2021

본 논문은 시멘트계 재료의 표면 및 구체에 소수성을 부여하여 내구성을 향상시키기 위한 기초연구이다. 실란/실록산계 혼합형 발수제를 혼입한 시멘트 페이스트를 제조하고 초기 수화성능 및 유동성능, 재령별 압축강도를 측정하였다. 또한 표면연마 전후의 물접촉각 및 SEM, XRD를 측정하였다. 실란/실록산계 혼합형 발수제를 혼입한 시멘트 페이스트의 플로우는 발수제 혼입량을 1.0%씩 높일수록 증가하였다. 실란/실록산계 혼합형 발수제를 혼입할 경우 시멘트 페이스트의 응결시간은 초결 및 종결 모두 지연되는 것으로 나타났다. 이러한 지연은 소수성에 기인하여 실란/실록산계 발수제를 클링커 입자 근처에 배치하여 소수성 장벽을 생성하기 때문이다. 실란/실록산계 혼합형 발수제를 시멘트 페이스트에 0.5% 혼입할 경우 압축강도는 증가하였으나 혼입량이 1.5%, 3.0% 증가할수록 압축강도는 감소하는 것으로 나타났다. 최대 혼입량 3.0%일 경우 압축강도는 최대 8.3%까지 감소하는 것으로 나타났다. 이는 발수제가 시멘트의 수화를 지연 및 방해하여 압축강도가 저하된 것으로 판단된다. 실란/실록산계 발수제를 시멘트 페이스트에 혼입할 경우 친수성이 개선되며 소수성을 나타내 접촉각이 커지는 것으로 나타났다. 또한 표면연마 후 접촉각은 표면연마 전보다 커지는 것으로 나타났다. 실란/실록산계 혼합형 발수제의 혼입은 표면뿐만 아니라 연마로 인하여 손상된 표면과 단면에서도 소수성을 나타내었다.