Abstract
Alkyl ketene dimer (AKD) sizing of paper involves the redistribution of the wax over the fibre surface upon heating. The two major mechanisms widely studied so far are the spreading of an autophobic precursor of molten AKD and AKD vapour transport and re-deposition on the fibre surface. All previous work assumed that the transport of AKD vapour could be expressed by the change of water contact angle with substrates that were exposed to the vapour. Information regarding the chemical composition of the vapour phase above the AKD wax has not been found in the literature. In this work, a simple method for analysing the chemical composition of the vapour is established. Our preliminary results indicated that the chemical composition of AKD vapour in the temperature range of 75–80 °C is dominantly fatty acids. This suggests that the sizing effect by actual AKD molecules via the vapour deposition mechanism is likely to be insignificant in this temperature range. This also implies that fatty acids play a positive role in AKD sizing. The chemical stability of AKD in this temperature range is also studied.
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References
Asakura K., Isogai A. (2004). Ef fects of fatty acids, fatty acid anhydrides and AKD-oligomers present in AKD wax on emulsion stability and paper sizing, Part 2. Kami Parupu Kenkyu Happyokai Koen Yoshishu 71:118–121
Atkins P.W. (1990). Physical Chemistry. 4th ed. Oxford University Press, UK, p.178
Beamson G., Briggs D. (1992). High resolution APS of organic polymers. John Wiley & Sons, Chichester England, p. 104
Chekhovskaya L.M. (1979). Ukrainskii Khimicheskii Zhurnal 45:1086–1089
Garnier G., Wright J. and Godbout L. 1998. Wetting mechanism of alkyl ketene dimers on cellulose films. Colloids and Surfaces A: Physicochem. Eng. Aspects 145: 153–165.
Garnier G. and Godbout L. 2000. Wetting behavior of alkyl ketene dimer on cellulose and model surfaces. J. Pulp Paper Sci. 26: 194–199.
Hiemenz P.C., Rajagopalan R. (1997). Principle of colloid and surface chemistry., 3rd ed., Marcel Dekker, New York, USA. p. 262
Hutton B. and Shen W. Sizing effect via AKD vaporization. Appita J. 58: 367–373
Isogai A. (1997). The Fundamentals of Papermaking Materials. In: Baker C.F. (eds). Fundamental Research in the Symposium Fundamentals of Papermaking Materials. Pira International, Cambridge England, pp.1047–1071
Isogai A. (1999). Mechanism of paper sizing by alkylketene dimers. J. Pulp Paper Sci 25:251–255
Jiang H., Deng Y. (2000). The effects ofinorganic salts and precipitated calcium carbonate filler on the hydrolysis kinetics of alkyl ketene dimer. J. Pulp Paper Sci 26:208–213
Lindstrom T., Soderberg G. (1986). On the mechanism of sizing with alkylketene dimers Part 1 Study on the amount of alkylketene dimer required for sizing different pulps. Nord. Pulp Paper Res. J 1:26–42
Morrison R.T., Boyd R.N. (1976). Organic Chemistry 3rd ed. Allyn and Bacon, Ico. Boston, USA, p. 580
Seo W.S., Cho N.S. (2005). Effect of water contents on cellulose-AKD reaction. Appita J 58:122–126
Seppanen R., Tiberg F. (2000). Mechanism of internal sizing by alkyl ketene dimers (AKD): The role of the spreading monolayer precursor and autophobicity. Nord. Pulp Paper Res. J. 15:452–458
Shen W., Brack N., Ly H., Parker I.H., Pigram P., Liesegang J. (2001). Mechanism of AKD migration dtudied on glass surfaces. Colloids and Surfaces A: Physicochem. Eng. Aspects 219:129–137
Shen W., Parker I.H. (2001). A preliminary study of the spreading of AKD in the presence of capillary structures. J. Colloid Interface Sci 240:172–181
Shen W., Xu F., Parker I.H. (2003). An experimental investigation of the redistribution behaviou of alkyl ketene dimers and their corresponding ketones. Colloids and Surfaces A: Physicochem. Eng. Aspects 212:197–209
Shchukarev A.V., Mattsson R., Odberg (2003). XPS imaging of the surface diffusion of alkyl ketene dimer on paper surfaces. Colloids and Surfaces A: Physicochem. Eng. Aspects 219:35–43
Socrates G. (2001). Infrared and Raman Characteristic Group Frequencies, 3rd ed. John Wiley & Sons, England p. 125
Swanson R.E. (1978). Mechanism of cellulose sizing produced by vapor phase adsorption Tappi 61:77–80
Yu L. and Garnier G. (1997) In: C.F. Baker (ed.), The Fundamentals of Papermaking Materials, 11th Fundamental Research Symposium in the Fundamentals of Papermaking Materials, Vol. 2. Pira International, Cambridge, England, pp. 1021–1046
Yu L., Garnier G. (2002). The role of vapour deposition during internal sizing A comparative study between ASA and AKD. J. Pulp Paper Sci 28:327–331
Acknowledgements
Two of us, H.Z. and W.S., would like to gratefully acknowledge BASF for the financial support to this joint research project (No. 243–7249). The authors would also like to thank Dr. N. Brack of Physics Department of La Trobe University for acquiring the XPS spectra for this work.
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Shen, W., Zhang, H. & Ettl, R. Chemical composition of “AKD vapour” and its implication to AKD vapour sizing. Cellulose 12, 641–652 (2005). https://doi.org/10.1007/s10570-005-9010-7
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DOI: https://doi.org/10.1007/s10570-005-9010-7