中性抄紙 陽性澱粉의 置換度가 ASA의 사이징과 加水分解에 미치는 영향 = Effects of Degree of Substitution of Cationic Starch on the Sizing and Hydrolysis of ASA in Alkaline Papermaking

다국어 초록 (Multilingual Abstract)

This study was carried out in order to investigate the effect of degree of substitution (DS) of cationic starches on ASA sizing further. Nitrogen contents of cationic starches were 0.137%, 0.306%, and 0.412%. It has been noted that the DS of cationic starches affects the sizing development of ASA by chainging the retention of ASA on fibers. The cationic starch with a high DS appeared to improve ASA retention, but the sizing efficiency of the ASA emulsion prepared with a cationic starch of high DS decreased more greatly as storage time extended since a hydrolysis of ASA proceeded more rapidly due to high pH of emulsion. It has also been found that when the emulsion was stored at higher temperature its sizing efficiency decreased. When the pH of the ASA emulsion was lowered by adding alum, the sizing degree was increased.