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- 저자 : F.Qnabe (검색결과 2 건)
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[Oral Session 2] ADSORPTION BEHAVIOR OF ALUMINUM COMPOUNDS ON PULP FIBERS AT WET-END
M.KATO,A.Isogai,F.Qnabe 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
Adsorption behavior of aluminum compounds on pulp fibers at the wet-end was studied in terms of structures of aluminum components using some analytical techniques. Fibrous cellulose powder (CF) and fibrous carboxymethylcellulose powder (FCMC) were used as models of pulp fibers. When de-ionized water was used, aluminum components originating from alum added to cellulose suspensions were adsorbed on FCMC, probably forming carboxyl group aluminum salts. On the other hand, no interactions occurred between hydroxyl groups of cellulose and aluminum components in the suspensions. Analysis of adsorption behavior of cationic aluminum species on cellulosic fibers using solution-state ^27AI-showed that any cationic aluminum species such as AI^3+, AI_13.met^+7 and aluminum polymers were adsorbed on FCMC. Again no interactions were recognized between such cationic aluminum species and hydroxyl groups of cellulose in the ^27AI-NMR study. Thus, adsorption and retention behavior of aluminum compounds in paper is greatly influenced by carboxyl contents of pulp fibers used. Mapping analyses revealed that aluminum components were distributed almost homogeneously in the cross sections of each pulp fiber for the handsheets prepared with 2% aluminum sulfate or 2% polyhydroxyaluminum chloride (PHAC). Thus, water-soluble aluminum species such as AI^3+ ions, AI_13mer^7+' and aluminum polymers can penetrate into the inside pulp fibers during the handsheet-making process.
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[Poster Presentation] MECHANISMS OF RETENTION AND SIZING DEVELOPMENT IN ROSIN SOAP SIZING
K.Ohno,A.Isogai,F.Qnabe 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
Sizing development and retention mechanism in rosin soap size-alum systems were studied. Rosin size and aluminum contents in hand sheets, which were prepared under various conditions, were determined by X-ray fluorescence analysis and pyrolysis-gas chromatography, respectively. ¹³C-labeled palmitic acid potassium salt was used as a model of rosin soap size, and chemical structures of size components in hand sheets were analyzed by solid-state ¹³C-NMR. The relationships among sizing degree, size retention and aluminum content in handsheets were obtained in terms of various handsheetconditions. Especially, most aluminum compounds originating from alum added to pulp suspensions are immediately adsorbed on pulp fibers and form cationic sites. Anionic rosin size components are then adsorbed on the cationic sites. When the ¹³C-labled palmitic acid soap size was used in handsheet-making, calcium palmitate was present as a major component in the handsheets. Molecules of free palmitic acid and aluminum palmitate were present as minor components. Formation of aluminum palmitate must be significant for size retention at the wet-end. However, it is not plausible that only aluminum palmitate molecules present in the handsheets as a quite minor component govern overall sizing performance. Molecules of calcium palmitate and free palmitic acid as well as aluminum palmitate probably behave as hydrophobic compounds in the handsheets, and contribute to sizing performance.
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