کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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594636 | 1453988 | 2011 | 7 صفحه PDF | دانلود رایگان |
Alkenyl succinic anhydride (ASA) is an internal sizing agent used to hydrophobize paper and paperboard in paper making process. Partly hydrolyzed ASA (hereinafter referred to as PH-ASA) emulsions can be stabilized by Laponite and short amines such as ethylamine, n-propylamine and n-butylamine. It is found that the short amines may improve the affinity of Laponite particles to PH-ASA, favoring PH-ASA emulsification, forming emulsion of high stability and small droplets. It is further observed that the sizing development of the PH-ASA on bleached chemi-mechanical pulp (BCTMP) is promoted when aluminum sulfate is added. Amine with longer carbon chain is more efficient both in promoting PH-ASA emulsification and in its sizing process. The amine molecules adsorbed on Laponite are more effective in stabilizing PH-ASA emulsions while the free amine in the dispersion work more efficiently in promoting sizing performance through a mechanism of accelerating the reaction between hydrolyzed ASA and aluminum sulfate. However, the PH-ASA emulsions lose most of their sizing effect by hydrolysis within 60 min.
The amine molecules adsorbed on Laponite are more effective in stabilizing PH-ASA emulsions while the free amine in the dispersion work more efficiently in promoting sizing performance.Figure optionsDownload as PowerPoint slideHighlights
► Partly hydrolyzed alkenyl succinic anhydride (ASA) is emulsified into stable o/w emulsions with aqueous dispersions of short amine modified Laponite.
► The partly hydrolyzed ASA emulsions can render water resistance on aspen bleached chemi-mechanical pulp.
► Free short amine in modified Laponite dispersions promotes the sizing development of the partly hydrolyzed ASA emulsions.
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 384, Issues 1–3, 5 July 2011, Pages 150–156