• 펄프종이기술
• /
• 제45권2호
• /
• pp.13-20
• /
• 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.

• 한국염색가공학회지
• /
• 제29권2호
• /
• pp.55-61
• /
• 2017

A non-fluorinated polystearyl methacrylate water repellent was synthesized by emulsion polymerization. The number and weight averaged molecular weights were obtained at around 137,277 and 237,754g/mole. The melting point was observed at $32^{\circ}C$. The contact angle of water droplet on fabrics treated with the water repellent was $140{\sim}145^{\circ}$ for cotton and polyester, and $125{\sim}130^{\circ}$ for wool and nylon. Since the critical surface tension was estimated at 20.7mN/m, even though relatively not so strong as fluorinated water repellent, it is considered to be used as a good water repellent practically.

• 한국세라믹학회지
• /
• 제37권8호
• /
• pp.760-767
• /
• 2000

Recently, the protection of construction is demanded with environmental pollution. These protect modes are use of concrete admixture, coat of protective polymer and impregnate of surface with chemicals etc. The most widely used impregnation is economical and effective. The define of Impregnation for construction protect is reacted in and consolidated substrate after absorbed. The impregnation agents are Polyesters, Acrylic monomers, Epoxy and Silicone derivatives. Commonly, because the Silane has good water repellency and environmental advantages that it widely used to water proofing agents, dampproofing agents and absorption reducer for concrete of bridges. When application of Silane, it occurs pollution and harmfulness as included organic solvent. The manufactures have tired to emulsification of Silane for the reducing of the defects. The Silane emulsion is vary unstable and does not stored long periods, and it is diminished in good properties with internal reaction. In this study we tried to emulsification of Silane for effectiveness improvement and reduce pollution and hazard and discussed properties variation of emulsion. The Silane emulsions are achieved emulsifying with W/O and O/W type surfactants. It used 0.24% PVA as protective colloid and stable phase is creamy. The creamy Silane emulsion performance as the penetration depth and water absorption rate are above 4 mm and below 0.1. It stable about 6 month at room temperature.

• 한국환경과학회지
• /
• 제8권1호
• /
• pp.61-67
• /
• 1999

Silicone oil has organic and inorganic properties, and its skeleton is polysiloxane bonding that silicon is bonded hydrogen or organic group. Silicone compounds are very smooth and lubricant properties by low surface tension, low temperature dependence, and nonadhesive properties. Because of these properties, silicone compounds are used as many parts of chemicals, softener, smooth and libricant agents, water-repellent agent, and defoaming agent, etc. Emulsion was prepared with the inversion emulsification method which adopted the agent-in-oil method dissolving the polyoxyethylene(7) tridecyl ether(HLB 12.2) into methoxy terminated poly(dimethyl-co-methyl amino) siloxane and hydroxy terminated poly(dimethyl-co-methyl amino) siloxane in water. At this time, processed emulsion was almost microemulsion. When ratio of emulsifier increases, emulsion is stable bacuause microemulsion is solubilized by emulsion drop size and zeta-potential are decreased. But, when amount of electrolyte is increase, emulsion became unstable because emulsion drop size is increased.

• 한국세라믹학회지
• /
• 제56권6호
• /
• pp.558-565
• /
• 2019

In this study, dimethyl silicone oil and liquid paraffin were combined and subsequently emulsified; the resulting mixture was innovatively incorporated into desulfurized gypsum to resolve its drawback of a poor water resistance. The waterproof mechanism of the composite emulsion and liquid paraffin emulsion with mass fractions of 1%, 2%, 3%, and 4% were investigated. The effect of the desulfurized gypsum on the waterproof performance and basic mechanical properties were also investigated. The configuration of the composite waterproofing agent was characterized by FTIR and ¹HNMR. The results showed that, compared with the traditional liquid paraffin emulsion-based waterproofing agent, the softening coefficient of the silicone oil paraffin composite emulsion-based water-repellent agent was increased by 60% and attained a value of 0.89. Combined with the waterproof mechanism and microscope morphology analysis of gypsum hydration products, the improvement in the water resistance of water resistance was primarily attributed to the formation of a silicone hydrophobic membrane between the crystals of the gypsum block; this ensured that water could not penetrate the crystal.

• 접착 및 계면
• /
• 제15권4호
• /
• pp.151-160
• /
• 2014

이상적인 내발수 특성을 얻기 위해 유화중합을 이용하여 n-methyol acrylamide (n-MAM)와 stearyl methacrylate (SMA)의 단량체에 기능성 단량체인 PFOEA의 함량(0-8 wt%)에 따른 공중합체를 합성하였고, 추가적으로 2-(perfluorooctyl) ethyl acrylate (PFOEA) 함량이 4 wt%인 조성에 m-isopropenyl-${\alpha}$,${\alpha}^{\prime}$-dimethylbenzyl isocyanate (TMI)의 함량(1~4 wt%)을 첨가한 공중합체를 합성하였다. 유화중합을 위해 비이온 유화제인 tridecyl alcohol (TDA-7), 양이온유화제인 alkyl dimethyl amine derivatives(ADAD)를 사용하였고 개시제로는 2,2'-azobis (2-amidinopropane dihydrochoride) (AAPDL)을 사용하였다. 합성된 공중합체에 대해서 FT-IR spectra를 이용하여 구조분석을 하였고 표면특성 분석을 위해 접촉각, 표면에너지, 발수도 그리고 SEM을 측정하였으며, TGA와 DSC를 사용하여 열적 특성을 확인하였다. PFOEA와 TMI의 특정 함량에서 우수한 발수도와 높은 열적 특성을 보이는 공중합체가 합성됨을 알 수 있었다.

• 한국수소및신에너지학회논문집
• /
• 제21권4호
• /
• pp.313-320
• /
• 2010

Carbon cloth was impregnated into PTFE emulsion. PTFE is a fluoropolymer used as a coating material in various fields due to its hydrophobicity and excellent mechanical properties. In this study, PTFE emulsion was prepared different particle size of 5~500 nm and $3{\sim}5{\mu}m$. FE-SEM and FT-IR spectroscopy were used microscopic observation and investigation of chemical structure change after PTFE coating. Mass variations, gas permeability and water contact angles were analyzed to determine a GDL performance of PTFE coated carbon cloth. PTFE coated carbon cloth show different mass increase according as PTFE concentration and the number of coating times. Water contact angle of PTFE coated carbon cloth was not effected by size of PTFE particle and the number of coating time; meanwhile, gas permeability was rapidly changed at carbon cloth coated by emulsion with size of $3{\sim}5{\mu}m$ PTFE particle.

• 펄프종이기술
• /
• 제39권2호
• /
• pp.31-37
• /
• 2007

Lithography like off-set printing is processed using the repellent properties between water and oil, so all inks for off-printing must work with dampening solution(water). The dampening water may cause the emulsification of ink by the printing pressure in the printing nip. This study aimed to investigate the effect of emulsified inks on print mottle. The cyan ink was emulsified artificially with the different IPA(isopropyl alcohol) content in this study. We evaluated the print mottle by densitometer and image analysis method. The print mottle phenomenon was directly affected by IPA content. The emulsification of inks also had an influence on flow properties of inks and it increased ink transfer rate. It, however, caused low ink density. Moreover the emulsified inks were spreaded to around dots and cause the thinning density on the non-printing area like print mottle. The trial printing showed that the emulsified inks also cause scumming on the printing result with little mistake of adjusting dampening solution and mostly decreasing dot reproduction. We could, therefore, find out the obvious effect of emulsified inks on print mottle.

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

• 한국구조물진단유지관리공학회 논문집
• /
• 제25권1호
• /
• pp.25-32
• /
• 2021

고내구성 친환경 콘크리트를 개발하기 위하여 폴리메틸 하이드로실록산과 폴리비닐알코올을 교반, 혼합하여 발수 및 소수성화합물을 제조하였다. 시멘트페이스트에 혼합물을 첨가한 후 BSE와 EDS 분석을 통하여 수화반응 특성과 화학조성의 변화 정도를 분석하였으며, MIP 분석에 의해 미세공극을 평가하였다. PMHS 유액을 혼입한 시멘트는 수화반응성이 높아지고 모세공극률이 낮아지는 것으로 분석되었으나, 시멘트 페이스트내에서의 유액의 분산 정도에 따라 공극률의 편차가 발생하는 것으로 나타났다. 메타카올린을 혼입한 유액의 경우에는 PMHS 유액만을 사용한 경우와 수화도와 공극률에서 거의 차이가 없는 것으로 나타났다. 그러나 시멘트 표면을 PMHS 유액으로 도포한 경우의 접촉각은 OPC와 비교하여 크게 증가하는 것으로 나타났으며, 특히 PVA 섬유를 같이 사용한 경우에는 과소수성 표면으로 변화되는 것으로 분석되었다.