• 대한화학회지
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• 제14권2호
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• pp.179-184
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• 1970

Four-ball EP and wear testers were used to study the effects of thickeners and additives on the EP and wear properties of some Korean greases. The EP property improved in the order of Li < Al < Ca, and the concentration of thickener did not affect the property when the same base oil and additives were used. The anti-wear property was improved in general when the additives were used.

• 한국식품영양학회지
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• 제13권4호
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• pp.307-311
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• 2000

Bechamel sauce의 배합비율과 방법을 달리하여 소스를 만들었을 때의 최적 조건은 다음과 같다. 1. 우유의 양과 조리 방법을 달리한 Bachamel Sauce의 점도와 퍼짐성은 각각의 시료간에 유의적인 차이를 나타내었으며(P<0.001), 점도는 우유에 첨가되는 루의 양이 적음에 따라 증가하며, 반대로 퍼짐성은 감소함을 알 수 있었다. 2. 양파 첨가 방법을 달리한 Bechamel sauce의 점도와 퍼짐성은 각각의 시료간에 서로 유의적인 차이를 나타내지 않았다(P<0.05). 3. 우유의 양과 조리 방법을 달리한 Bechamel sauce의 관능적 평가는 각각의 시료간에 유의적인 차이를 나타내었다(P<0.001). 색, 부드럽기, 전체적인 맛 등에서 높은 기호도를 나타낸 것은 버터와 밀가루 그리고 우유가 1 : 1 : 17인 것이었다. 4. 양파 첨가 방법을 달리한 Bechamel sauce의 관능적 평가에서는 점도, 부드럽기, 풍미, 전체적인 맛에서 각각의 시료간에 유의적인 차이를 나타내었으며(P<0.001), 버터에 양파를 볶아서 만드는 방법이 가장 기호도가 높았다.

• Applied Biological Chemistry
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• 제49권1호
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• pp.70-76
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• 2006

Purecell, hydroxyethyl-cellulose-2-hydroxypropyltrimethyl ammonium chloride ether, was developed as a thickener and evaluated its functions for stability and safety when it was added in the cosmetic composition. Compared with a commercially available thickener Natrasol, Purecell have a basic chemical backbone of hydroxyethylcellulose which has been widely used in the cosmetic industry. pH and viscosity of Purecell was lower than those of Natrasol, however, a similar pH value to was shown when the Purecell was added into a shampoo or cream. The Purecell was stable to temperature and light. When 0.5% of the Purcell was added to a shampoo having cationic surfactant, a separation occurred due to the same cationic surfactant of the Purecell and shampoo. However, the shampoo and cream made with Purecell improved a smoothness and adaptability of hair. It also showed a negative response for Patch test of human, indicating the Purecell was safe for use.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2003년도 학술대회지
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• pp.139-148
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• 2003

In this study, biodegradable base Li-greases were prepared by using Li-soap thickener and vegetable oils such as soybean oil, rapeseed oil, castor oil and synthetic ester. Also, EP-greases were formulated by blending base Li-greases, anti-wear additives, EP additives, anti-oxidants and corrosion inhibitor etc. And EP-greases were characterized by analysing physical properties such as worked penetration, dropping point, 4-ball wear, extreme pressure, thermal properties etc. Biodegradability of base Li-greases and EP-greases were evaluated by CEC-L-33-A-93 method using several inoculums of domestic sewage treatment plant. As the results, biodegradability of vegetable oils were shown at the range of 97.1 to $98.4\%$. And biodegradability of base Li-greases and EP-greases were $86.2\%\;\~\;89.3\%\;and\;83.4\%\;\~\;90.0\%$ which were lower value than those o( vegetable oils due to effect of Li-soap thickener, respectively. Therefore, the EP-greases prepared in this study were easily biodegraded by microorgnism.

• 공업화학
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• 제35권4호
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• pp.329-334
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• 2024

정제된 시벅턴오일을 사용하여 자외선차단 크림을 제조하고, 자외선 흡수능 및 유화안정성을 최적화하기 위해 중심합 성계획모델 반응표면분석법(CCD-RSM)로 실험 조건을 설계하였다. 실험의 독립변수는 유화제 첨가량, 유화시간, 점증제 첨가량으로 설정하였고, 반응치로는 ESI, MDS, 290 nm에서의 흡광도로 설정 후 실험을 진행하였다. RSM 최적화를 통해 산출된 회귀방정식 계수의 F-value와 P-value을 통해 반응치에 가장 영향을 주는 주효과도와 교호효과도를 분석하였고 P-value를 통해 계수의 통계적 유의성을 평가하였다. 반응표면분석법을 통해 산출된 최적 유화조건은 유화제 첨가량(4.39 wt%), 유화시간(25.42 min) 및 점증제 첨가량(1.24 wt%)으로 산출되었고, 이때 반응치 값은 ESI (98.5%), MDS (322.9 nm), 그리고 UV 흡광도(2.73)이다. 산출된 최적 조건으로 실제 실험을 진행한 결과 평균 오차율은 ± 2.7% 로 측정되었다.

• Preventive Nutrition and Food Science
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• 제3권4호
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• pp.382-386
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• 1998

A soluble dietary fiber, $\beta$-glucan, contained in oat and barley has nutritional benefits such as hypocholesterolemic effects and influences blood glucose regulation. The contents of $\beta$-glucan in both cereals range from 3 to 7% with the exception of a certain barley genotype which contains up to 16% $\beta$-glucan. $\beta$-Glucan is distributed mainly in the cell walls of endosperm and the distal (bran) portion of kernel. Various procedures have been developed for increasing the extraction yield of $\beta$-glucan. Oat gum prepared with weak alkali extractionand alcohol proecipitation following protein removal usually contains 80% $\beta$-glucan.The most commonly used method for $\beta$-glucan quantitiation is an enzymatic procedure combining lichenase plus $\beta$-glucosidase followed by measuring the amount of glucos released by glucose oxidase-peroxidase treatment. The increase in foam-and emulsion-stabilizing capacity of $\beta$-glucan is due to the increase in viscosity of the aqueous phase. Therefore, $\beta$-glucan shows great potentials as a thickener and a stabilizer.

• Tribology and Lubricants
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• 제27권5호
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• pp.275-280
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• 2011

Automotive wheel bearing grease helps to reduce stresses and prevent wear of wheel bearings. But it is easily contaminated by water and other contaminants. In this study, we investigated the property change of automotive wheel bearing grease under water contamination. The result showed that some properties such as dropping point, work penetration and oxidation stability were not influenced by water content. However, most of properties such as work stability, water washout characteristics, leakage tendency, oil separation, evaporation loss and rust protection became worse after water was added. This is thought that added water makes the interaction weak between thickener and base oil of grease.

• Fibers and Polymers
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• 제6권3호
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• pp.229-234
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• 2005

In this paper, chitosan was suggested for using as a replacement for sodium alginate in the pretreatment print paste for digital ink-jet printing for cotton fabric. Pretreatment print pastes prepared from the mixture of chitosan and acetic acid with the appropriate viscosity gave satisfactory prints on the cotton fabric. Chitosan-treated cotton fabrics were digitally ink-jet printed with four different colors and the color fastness rating of the printed fabrics was satisfactory. Experimental results revealed the possibility of pre-treating the cotton with chitosan to replace the sodium alginate normally present in the pretreatment print paste recipe.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2003년도 추계학술발표논문집
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• pp.139-147
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• 2003

Coater runnability of the paper coating and final product properties can be affected by the immobilization of coating color and the dewatering into the base paper. During the dewatering, the rheological properties and solids content of a coating are dramatically changed. For the purpose of obtaining better coater runnability and high quality of coater paper many papermakers are trying to improve the water retention of paper coatings by using some additives such as thickener and co-binder. In this study, we tried to investigate the rheological properties and the immobilization point of coatings with immobilization cell during the dewatering of coatings.

• 펄프종이기술
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• 제30권2호
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• pp.62-73
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• 1998

The aim of this work was to investigate the effects of pigment composition on the calendering response and structure of the coated paper. Calendering response of the coated paper was determined from the gloss values of the uncalendered and calendered coated papers, and the relationship between gloss and coating structure was discussed. The surface and cross section of the coating layer was observed using a scanning electron microscope to examine the coating structure. Coating layers were hardened in epoxy resin and polished with carbimet paper disc for preparing SEM samples. Maximum calendering response was obtained for the coated paper prepared from 80pph of clay and 20pph of ground calcium carbonate (GCC) as pigments. Photomicrographs of the surface and cross section of the coating layer show that clay tends to form dense coating structure, while GCC tends to form bulky coating layer.