• 공업화학
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• 제5권5호
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• pp.749-755
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• 1994

이미다졸린형 화합물은 화장품을 비롯한 여러 공업분야에서 응용되어 왔다. 이 물질은 거의 모든 pH 범위에서 사용이 가능하며 비자극성의 특성 때문에 그 사용이 지속적으로 증가되고 있다. 공업적 응용에 있어서는 보다 안전성이 요구되고 있기 때문에 새로운 기능을 갖는 양쪽성계면활성제의 이용이 더욱 증가될 것으로 본다. 그리하여 이미다졸린형 양쪽성계면활성제의 화학구조적 특성에 관한 일반성을 기술하였다.

• 펄프종이기술
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• 제29권2호
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• pp.7-15
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• 1997

High shear viscosity at several solids levels was measured for a number of pigment slurries and coating colors containing either anionic or amphoteric latex and analyzed according to Mooney and Eiler equations. Maximum packing fraction and intrinsic viscosity were obtained and compared. Eiler equation provides more credible information than Mooney equation on particle packing and intrinsic viscosity. The packing fraction obtained from Eiler equation was slightly greater than that obtained from static FCC measurement indicating the influence of pigment movement under the dynamic condition. Amphoteric latex caused 4-5% increase of maximum packing fraction of a coating color when its pH is lowered from 7 to 6, while anionic latex did not show any significant change in packing characteristics.

• 한국응용과학기술학회지
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• 제10권1호
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• pp.83-91
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• 1993

The syntheses of urocanic acid esters was optimized, starting from p-toluenesulfonic acid salt of this acid and long chain fatty alcohols in the organic solvent and extracting water from it by means of azeotropic Compound. The salts of these urocanic acid esters showed amphoteric properties, but their micellization enhances their rate of hydrolysis leading to the free amine. Nevertheless the long chain gives to the esters themselves an amphoteric character allowing their solubilization in micellar media and in microemulsions the result, yield could enhanced.

• 한국응용과학기술학회지
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• 제26권3호
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• pp.233-239
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• 2009

A reaction device raising a generation yield by efficiently removing water generated in an esterified reaction between diethylene glycol monoethyl ether and succinic acid with mixture of an azeotropic point was newly developed as a new product in development of more stabilized emulsifier with a semi-solid phase(cream) in an emulsified phase of interfacial activity. The bis-(diethylene glycol monoethyl ether succinate(hereinafter, called as BDGS) with a high yield of more than 95% was obtained. As this has a property containing amphoteric emulsified functions such as W/O type or O/W type, etc., and has a merit that can be used regardless of any emulsified phase, there is no need using other emulsified surfactant. therefore, as this has excellent skin wetability in the cosmetics industry, a product having a wider range in quality compatibility or cost saving, etc. as a humectant has been developed.

• 품질경영학회지
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• 제13권1호
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• pp.26-30
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• 1985

In the light of the properties of colloids, in the surface of disperse phase and dispersion, there exist specific characters such as adsorption or electric double layer, which seems to play important roles in determining the physiochemical properties in the dyeing system. Nylon, wool and silk, the typical amphoteric fibers were dyed with Acid dye and various combinations were prepared by combining pH, temperature and dye concentration, in order to generate flowing electric potential which were measured by microviolt meter and specific conductivity meter. The results were transformed to Zeta potential by Helmholtz-Smoluchowski formular and to surface electric charge density by Suzawa formular, surface dye amount, and effective surface area of fibers, and these data were statistically analysed by principle component analysis.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 1999년도 Proceedings of Pre-symposium of the 10th ISWPC
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• pp.125-129
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• 1999

This paper dealt with effect of dual component and micropartical retention system on papermaking. First-pass retention under dynamic drainage condition was studied in neutral and alkaline papermaking system. Cationic starches, amphoteric starches and amphoteric polyacrylamide were added prior to high shear force, then anionic. The system is found to be very useful to inprove filler retention. For mitigating unfavorable effect of interfering sub-stances, anionic trash catcher(ATC) such as p-DADMAC was tested in this study.

• Macromolecular Research
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• 제13권5호
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• pp.385-390
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• 2005

The electrospinning process is a fascinating method to fabricate small nanosized fibers of diameter several hundred nanometers. Surfactant-polymer solutions were prepared by adding poly(vinyl alcohol) (PVOH) to distilled water with cationic, anionic, amphoteric, and non-ionic surfactants. Average diameter of the electrospun PVOH fibers prepared from PVOH solution was over 300 nm, and was decreased to 150 nm for the mixture of PVOH/amphoteric surfactant. To explain the formation of ultra fine fiber, the characteristic properties in a mixture of PVOH/surfactant such as surface tension, viscosity, and conductivity were determined. In this paper, the effect of interactions between polymers with different classes of surfactants on the morphological and mechanical properties of electrospun PVOH nonwoven mats was broadly investigated.

• Applied Biological Chemistry
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• 제7권
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• pp.59-65
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• 1966

The ionic character of antibiotics and suitable pH values for their extraction can simultaneously be determined by pH-chromatography. The authors utilized the analytical procedure in determining the ionic character of several antibiotics, followed by microbiological Rf determination. The folowing conclusions were made: (1) Antibiotics analyzed can be devided into four groups according to their ionic chracter, that is acidic, basic, neutral, and amphoteric compounds. (2) Penicillin and aureomycin are proved to be acidic, streptomycin to be basic, polymyxin-B to be neutral, and finally both chloromycetin and erythromycin to be amphoteric. The results on their ionic character with regard to their molecular structure were briefly discussed.

• 펄프종이기술
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• 제33권2호
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• pp.24-31
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• 2001

As a novel method to improve strength properties of recycled test liner, Condebelt press drying system was introduced and adopted into Korea. New press drying treatment could enhance the surface and strength properties in accordance with the increase of sheet density. However, Condebelt drying can not increase the density of repeatedly recycled test liner as much as that of virgin UKP and at the same density condition, the strength of Condebelt press dried UKP is greater than that of press dried test liner. In order to increase the strength of test liner, two attempts were tried in this study. First, addition of polyelectrolytes, dry strength agent was investigated with a view to promote the fiber bonding potential of reclaimed corrugated container pulp. Second, blending effect of fines were analyzed in an aims of increasing density and strength of test liner. The results were as follows; Even in the case of test liner densified by Condebelt press dryer, addition of amphoteric PAM as a dry strength agent was effective in increasing strength properties and so the effect of dry strength agent on improving bonding potential of recycled OCC fiber could be confirmed. As an appropriate addition level of amphoteric PAM, below 1% based on dry pulp weight was suggested. Different from virgin UKP, density of recycled test liner can be increased by the blending of OCC fines and strength properties also can be improved. However, excessive blending of OCC fines could result in decreasing of density and serious weakening of test liner. The best blending ration of fines in test liner can be determined as about 30%. Taking into account the fines content in general OCC pulp as 50%, excessive 20% of fines were supposed to be fractionated and removed in order to achieve the best strength of Condebelt press dried test liner.

• 한국응용과학기술학회지
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• 제12권1호
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• pp.47-54
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• 1995

각종 세정제의 난용 및 과대 사용으로 인한 수질오염이 날로 심각해지고 있으며 이 때 수질오염의 원인은 주로 계면활성제에 의해 발생한다. 본 연구는 이미 다졸린으로부터 유도된 9종의 양쪽성계면활성제와 석유 화학물질로부터 제조하여 대량 사용하고 있는 sodium lauryl sulfate(SLS)에 대한 세정성을 비교하여 보다 우수한 계면활성제를 선정하고자 한다. 또한 세정성의 비교는 세정력의 측정과 세정에 관한 물리화학적 측면에서 그 원인을 규명하고자 한다. 1-(2-hydroxyethyl)-1-(3-sulfonatedropy)-2-undecyl-2-imidazolinum [IV]는 세정성 및 다른 기초적 물성이 우수하여 세정제에 응용할 경우 세정성이 우수한 계면활성제 일수록 오염 부착에 필요한 일이 적게 나타나 오염이 쉽게 제거될 수 있음을 증명하였으며 그로 인한 공업적 응용성에 기대가 크다.