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RISS 인기검색어
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- 저자 : LiliMelani (검색결과 1 건)
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Effects of Fatty Acid Content on AKD Emulsion Stability and Sizing Performance
LiliMelani 국민대학교 일반대학원 2017 국내석사
Abstract Effects of Fatty Acid Content on AKD Emulsion Stability and Sizing Performance Lili Melani Department of Forest Products and Biotechnology, Graduate School Kookmin University Seoul, Korea AKD emulsion consists of fatty acid as a raw material. The present of that fatty acid might have negative, positive, or negligible impact on emulsion stability and paper sizing performance. It is essential to understand since many industries doing export-import activity in related to distribute AKD in form of emulsions. Longer distributing period and unstable condition during shipping period might be influences the stability and performance of AKD. This thesis investigated the stability of alkyl ketene dimer (AKD) emulsion based on fatty acid content, storage temperature, and storage period. In addition, sizing performance of AKD emulsion were investigated based on fatty acid content and the dosage those was applied on handsheet making. In this study, three kinds of AKD emulsion there are emulsion A1, A2, and A3 with different fatty acid content in term 12.5; 15; and 20% respectively were kept in water bath at different temperature 40, 50, and 60°C for 0, 15, and 30 days storage period. Stability had analyzed after 15 and 30 days in term of particle size and viscosity. Hydrolyzed AKD have analyzed by FT-IR and 1H-NMR after 30 days storage. Further, the physical properties and sizing degree performance such as bulk, density, tensile index, Cobb , Stöckigt, and water contact angle were evaluate. According to these results, increasing fatty acid from 12.5% to 20% would increase the viscosity. Moreover, temperature slightly effect to viscosity of emulsion, which is increasing temperature would decrease the viscosity. In term of storage period, the viscosity decreased as well as the longer storage period. Through FT-IR the 1H-NMR, band at 1848, 1720 cm-1 and peak near 2.3 ppm where ketones and carboxylic acid typically found clearly appeared, thus it gives positive result to hydrolysis of AKD. Result showed that bulk was in range 1.60-1.76 cm3/g, density was in range 0.57-0.62 g/cm3, and tensile index slightly decreased by increasing fatty acid content from 12.5 to 20%. Further, the performance of Cobb sizing degree would increase as well as the increasing of fatty acid content. AKD was hydrolyzed due to thermal condition gave better sizing degree. For Stöckigt test and water contact angle, the result were similar with Cobb sizing test, it suitable that increasing fatty acid content of AKD performed better sizing degree. Moreover, increasing the dosage of AKD in papermaking process led to increase sizing degree performance. By considered some aspects, such as less chemical usage and the obtained results emulsion A3 were select for the best treatment option to be applying in papermaking process. Keywords: AKD emulsion, fatty acid content, stability, sizing performance
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