Abstract
The chemical treatment of woody materials to produce fibers (pulps) also produces a nearly equal amount of soluble chemicals consisting mainly of modified lignin and carbohydrate degradation products. In most chemical pulp mills, this material is burned to create energy for the recycling of pulping chemicals. A small number of pulp mills, mostly acid sulfite mills, purify the lignin streams and market this material commercially. In 1998, close to one million tons of lignosulfonates were used worldwide in a variety of industrial applications.1 The largest use of this material is as a dispersant of particle slurries such as concrete, clays, gypsum, and dyes.2 In these applications, lignosulfonates must compete with synthetic dispersants such as condensation polymers of formaldehyde with sulfonated naphthalene. Much effort, therefore, has been directed towards increasing the dispersing ability of lignosulfonates in these systems through chemical modifications and physical separations. These processes, however, can also affect other properties of the particle slurries such as setting time, air entrainment, and color. It is very important, therefore, to look at the entire system when considering a lignin modification. In this chapter, the effect that lignosulfonate components and chemical modification reactions have on the function of lignosulfonate dispersants in the manufacture of gypsum wallboard will be discussed.
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References
J. D. Gargulak and S. E. Lebo, Commercial use of lignin-based materials, in: Lignin: Historical, Biological, and Materials Perspectives, ACS Symposium Series 742, edited by W. G. Glasser, R. A. Northey, and T. P. Schultz (American Chemical Society, Washington D.C., 2000), pp. 304–320.
R. A. Northey, Low cost uses of lignin, in: Emerging Technologies for Materials and Chemicals from Biomass, ACS Symposium Series 476, edited by R. M. Rowell, (American Chemical Society, Washington D.C., 1992), pp. 146–175.
K. C. French and P. A. Leeming, Reducing the water demand of gypsum plaster, Great Britain Patent: 1,086,869a (1989).
R. A. Northey and K. D. Helton, Water-reducing agent advancements for gypsum wallboard slurry thinning, in: Inorganic-Bonded Wood And Fiber Composite Materials Volume 4, edited by A. A. Moslemi (Forest Products Society, 1995), pp. 69–74.
R. A. Northey, C. Lee, C. R. Matz, and S. D. Krammer, The relationship between lignosulfonate physical properties and the ability to reduce inorganic slurry viscosity, Proc. 10th Int. Symp. Wood Pulping Chem. Oral Presentations (Yokohama, Japan, 1999), pp. 496–499.
R. A. Northey and S. K. Madsen, Modified lignosulfonate dispersant for gypsum, U.S. Patent: 5,286,412 (1994).
M. H. Simatupang and X. X. Lu, Influence of wood extractives on hardening o plaster of Pairs and on the manufacture of gypsum-bonded particle board, Holz als Roh-und Werksoff 43, 325–331 (1985).
J. C. Le Bell, The relation between the structure of lignosulfonates and their effect as stabilizers for latex particulate dispersions, Colloids Surf. 9(3), 237–251 (1984).
S. Y. Lin and W. J. Detroit, Chemical heterogeneity of technical lignins — significance in lignin utilization, Proc. Intl. Symp. Wood Pulping Chem. Vol. 4 (Stockholm, Sweden, 1981), pp. 44–52.
R. F. Buchholz, J. A. Neal, and J. L. McCarthy, Some properties of paucidisperse gymnosperm lignin sulfonates of different molecular weights, J. Wood Chem. Technol. 12(4), 447–469, (1992).
S. Y. Lin, Commercial spent pulping liquors, in: Methods in Lignin Chemistry, Springer Series in Wood Science, edited by S. Y. Lin and C. W. Dence (Springer-Verlag, New York, 1992), pp. 75–80.
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Northey, R.A. (2002). The Use of Lignosulfonates as Water Reducing Agents in the Manufacture of Gypsum Wallboard. In: Hu, T.Q. (eds) Chemical Modification, Properties, and Usage of Lignin. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0643-0_8
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DOI: https://doi.org/10.1007/978-1-4615-0643-0_8
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