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Methyltrimethoxysilane과 Trimethylethoxysilane을 이용한 비불소계 발수 코팅 도막의 제조
김동구,이병화,송기창 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.2
Non-fluorinated water repellent coating solutions were obtained using methyltrimethoxysilane (MTMS) and trimethylethoxysilane (TMES) as precursors. The solutions were spin-coated on a cold-rolled steel sheet and cured thermally to prepare water repellent coating films. During this process, the effect of molar ratio of TMES/MTMS was studied for the hydrophobic properties of the coating films. Hydrophobic properties of coating films were characterized using contact angle measurement, surface morphology analysis and infrared spectroscopy. When the molar ratio of TMES/MTMS was varied from 0 to 30, the contact angle of the un-coated cold-rolled steel sheet was 30o, whereas when the molar ratio of TMES/MTMS was 1, the contact angle increased to 104o and water repellency was significantly improved. In the case of TMES/MTMS molar ratios of 10, 15, 25 and 30, the contact angles of coating films showed 109o, 114o, 117o and 144o, respectively. At this time, the hydrophobicity of the coating films was improved by the increase of the surface roughness and the content of the methyl component at the coating surface. In particular, when the molar ratio of TMES/MTMS was 30, the overall surface roughness was greatly increased due to the presence of surface particles as well as the water repellency due to methyl groups of TMES, resulting in super hydrophobicity of 144o. Methyltrimethoxysilane (MTMS)과 trimethylethoxysilane (TMES)을 전구체로 사용하여 비 불소계 발수 코팅 용액을 제조하였다. 이 코팅 용액을 냉연 강판 위에 스핀 코팅하고 열 경화시켜 발수 코팅 도막을 제조 하였다. 이 과정 중 코팅 도막의 소수성에 미치는 TMES/MTMS의 몰 비 영향이 연구되었다. 코팅 도막의 소수성은 접촉각 측정, 표면 형상 분석 및 적외선 분광법을 사용하여 연구되었다. TMES/MTMS의 몰 비를 0에서 30까지 변화 시켰을 때, 코팅되지 않은 냉연강판의 접촉각은 30o인 반면에 TMES/MTMS의 몰 비가 1인 경우는 접촉각이 104o로 크게 증가하여 발수성이 향상되었다. 또한 TMES/MTMS의 몰 비가 10, 15, 25, 30인 경우는 각각 접촉각이 109o, 114o, 117o, 144o로 TMES/MTMS의 몰 비가 증가할수록 냉연강판의 접촉각이 점차 증가하는 경향을 보였다. 이때 코팅 도막의 소수성은 표면 거칠기의 증가와 코팅 표면에서의 메틸 성분의 함량 증가로 인해 향상되었다. 특히 TMES/MTMS의 몰 비가 30인 경우에는 TMES의 메틸기로 인한 발수성뿐만 아니라 표면 입자의 존재로 인해 전체적인 표면 거칠기가 크게 증가하였기 때문에 144o의 초발수성을 나타내었다.
Colloidal Silica와 Methyltrimethoxysilane간의 졸겔반응으로 합성된 코팅제 특성 연구
강동필,박효열,안명상,이태희,명인혜,강귀태 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.9
Hardness and surface property of coated gel materials are considerably different according to kinds(particle size/stabilized ion) of colloidal silica(CS), kinds of silanes, content ratio of silane versus CS, and reaction degree in sol solution. We report the properties of sol-gel coating materials in which the factors of reaction are kinds of CS, contents ratio of CS and MTMS, and reaction time of sol. The contact angles of the coated films obtained from the mixed CS system showed a little good relationship with MTMS content increase to those from HSA CS reaction system and the change of contact angle didn't have much effect on reaction time of sol. In the coating films obtained from HSA CS reaction system, the surface was much rough in case of that the content MTMS decreased and the reaction of sol kept long. The surface roughness of films obtained from the mixed CS reaction system showed similar tendency, though its degree was a little different. In synthesis of sol-gel coating materials, we could identify that choice of CS kinds and content ratio of CS and silane were important and it was desirable the reaction time of sol is not long.
Park, Hoyyul,Na, Moonkyong,Ahn, Myeongsang,Kang, Dongjun,Lee, Hyeonhwa,Chung, Ildoo TaylorFrancis 2009 Molecular Crystals and Liquid Crystals Vol.510 No.1
<P> We studied the properties of inorganic-organic hybrid coating films prepared by boehmite sol. Sols were synthesized by sol-gel process using nano boehmite and methyltrimethoxysilane in variation with the amount of methyltrimethoxysilane at different reaction time. In order to understand physical and chemical properties of sols prepared from boehmite and methyltrimethoxysilane, coating films were fabricated on glass substrates by dip-coating process. The crystalline pattern and morphology of sol powder of boehmite were observed. Contact angle, surface roughness, transmittance, chemical bond and thermal stability of coating films were investigated.</P>
R5 Peptide-based Biosilicification Using Methyltrimethoxysilane
박정찬,김도현,김창섭,서정현 한국생물공학회 2018 Biotechnology and Bioprocess Engineering Vol.23 No.1
We examined the performance of methyltrimethoxysilane (MTMS), a precursor of silicic acid, in the process of biosilicification induced by the R5 peptide from Cylindrotheca fusiformis. Recombinant GFP-R5 fusion protein was produced by Escherichia coli cultured at 25°C as a soluble and functional formation, but not at 37°C. MTMS-based biosilica deposits had a larger average diameter compared to tetraethyl orthosilicate (TEOS)-based deposits. Reducing phosphate concentration in the buffer system led to a decrease in the size of MTMS-based biosilica. These results provide insight into the surface modification of biosilica, and control of biosilica particle size, when using hydrophobic precursors such as MTMS.
MTMS와 TMES로부터 제조된 코팅 도막의 발수성에 미치는 촉매와 용매 종류의 영향
김동구,이병화,송기창 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.6
Methyltrimethoxysilane (MTMS) and trimethylethoxysilane (TMES) as starting materials were dissolved in various types of solvents, and hydrolysis with water and polycondensation reaction were carried out using various types of catalysts to prepare non-fluorinated water-repellent coating solutions. The coating solutions were spin-coated on cold-rolled steel sheets, and thermally cured to prepare water-repellent coating films. The effect of types of catalysts and solvents on the water repellency of the resulting coating films was investigated during this process. When hydrochloric acid and nitric acid, which are strong acids, were used as catalysts, the solutions showed a white opaque state due to the aggregation of siloxane polymers. On the other hand, when acetic acid, phosphoric acid, and oxalic acid, which are weak acids, were used, they were in a stable and transparent state without precipitation. As a result, the contact angles of the coated films, prepared from hydrochloric acid and nitric acid, were 58o and 92o, respectively, showing low water repellency. On the other hand, when acetic acid, phosphoric acid, and oxalic acid were used, the contact angles of the coated films were 101o, 103o and 116o, respectively, showing high water repellency. In addition, when isopropanol and ethanol were used as solvents, phase separation occurred in the solutions due to the aggregation of siloxane polymers. On the other hand, when methanol, ethyl acetate, and methyl ethyl ketone were used as solvents, the solutions were transparent and showed a stable state without sedimentation. Methyltrimethoxysilane (MTMS)과 trimethylethoxysilane (TMES)을 출발물질로 사용하여 여러 종류의 용매에 용해시킨 후 다양한 종류의 촉매를 사용해 물과의 가수분해 및 중축합반응을 진행시켜 비불소계 발수 코팅 용액을 제조하였다. 또한 이 코팅 용액을 냉연 강판 위에 스핀 코팅하고 열 경화시켜 발수 코팅 도막을 제조 하였다. 이 과정 중 촉매와 용매의 종류 변화가 생성된 코팅 도막의 발수성에 미치는 영향을 연구하였다. 강산인 염산과 질산을 촉매로 사용한 경우에는 용액 내에 siloxane polymer들의 응집이 발생한 흰색의 불투명 상태를 나타냈다. 반면에 약산인 아세트산, 인산과옥살산을 사용한 경우에는 투명하고 침전이 없는 안정한 용액 상태를 보였다. 이로 인해 강산인 염산과 질산을 사용한경우의 코팅 도막의 접촉각은 각각 58o와 92o로 낮은 발수성을 보인 반면에 약산인 아세트산, 인산과 옥살산으로 제조된 경우에는 각각 101o, 103o, 116o의 접촉각을 보여 높은 발수성을 나타내었다. 또한 이소프로판올과 에탄올을 용매로사용한 경우에는 용액 내에서 siloxane polymer들의 응집이 일어나 불투명한 침전이 발생한 상분리 현상을 보인 반면 메탄올, 에틸아세테이트와 메틸에틸케톤을 용매로 사용한 경우에는 투명하고 침전이 없는 안정된 상태를 나타내었다.
이주연,조선희,임종주 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.74 No.-
In this study, the surface modification of CaCO3 nanoparticles was performed by using a silane couplingagent methyltrimethoxysilane (MTMS) and effect of surface hydrophobicity on the stability of foam andemulsion was investigated. In order to confirm surface modification of CaCO3 nanoparticles by MTMS,Fourier infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis havebeen carried out. Atomic concentration of CaCO3 particle surface treated by MTMS has been identified byusing X-ray diffractometer and X-ray photoelectron spectroscopy analysis. The active ratio for the CaCO3nanoparticles modified by MTMS was found to be 96.6 0.4% at 15 wt% of MTMS concentration where thecontact angle of water on the CaCO3 surface modified by MTMS was found to be 89.6 0.4 . Both stableemulsion and foam were formed at 15 wt% of MTMS concentration, suggesting that CaCO3 nanoparticletreated by a silane coupling agent MTMS is a strong candidate for the potential applicability as a stabilizerfor foam and emulsion.
실란커플링제 종류 변화가 수분산 폴리우레탄의 특성에 미치는 영향
신용탁 ( Yong Tak Shin ),황지현 ( Ji Hyeon Hwang ),홍민기 ( Min Gi Hong ),최진주 ( Jin Joo Choi ),이원기 ( Won Ki Lee ),이경배 ( Gyoung Bae Lee ),유병원 ( Byung Won Yoo ),이명구 ( Myung Goo Lee ),송기창 ( Ki Chang Song ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.3
NCO terminated polyurethane prepolymers were synthesized from isophorone diisocyanate(IPDI), poly (tetramethylene glycol)(PTMG) and dimethylol propionic acid(DMPA). Subsequently, waterborne polyurethanes were prepared by capping the NCO groups of polyurethane prepolymers with different types of silane coupling agents, such as methyltsimethoxysilane(MTMS), glycidoxypropyl trimethoxysilane(GPTMS), methaeryloxypropyl trimethoxysilane(MPTMS) and aminopropyl triethoxysilane(APS). The avenge particle size of the waterborne polyurethane solutions was increased by adding silane coupling agents. Also, the coating films prepared from GPTMS, MPTMS and APS, exhibited better pencil hardness than those from pure waterbome polyurethane. On the other hand, the coating films from MTMS did not show an improved pencil hardness than those from pure waterbome polyurethane.