Waterborne coatings, chemistry

Superheated and supercritical water are used in several applications. Supercritical water is most often used in the destruction of organic wastes, including some chemical warfare agents, as an alternative to incineration (Katritzky et al., 1996 Sherman et al., 1998). Recent reports describe the use of both forms as a solvent and as a reactant in synthetic chemistry (Katritzky et al., 1996 An et al., 1997). Some of the reactions investigated include metal-mediated alkyne cyclizations, Pd-catalyzed al-kene arylations, aldol reactions, the Fischer indole synthesis, and hydrolysis reactions. Waterborne coatings and the destruction of wastes in supercritical water are fully... 

L. A. Utracki. Advances Chemistry Series, vol. 239 (ACS Books, Washington, DC, 1 4) F.H. Walker, O. Shaffer, in Film Formation in Waterborne Coatings, ed. by T. Provder,... 

C Hegedus, D Lawson, D Lindenmuth. Two component, waterborne polyurethane coatings chemistry and application. Proceedings of Twenty-fifth International Waterborne, High-Solid, and Powder Coatings Symposium, New Orleans, 1998, pp 391-408. 

For information on the chemistry of two-component waterborne polyurethane technology, the reader should see the review of Wicks et al. [ 16]. A very good review of the effects of two-component waterborne polyurethane formulation on coating properties and application is available from Bassner and Hegedus [11]. 

The chemistry of real latex formations is complex and currently defies predictive modeling. A reported problem for waterborne modelers is that an increase in curing temperature can affect various coating components differently. Snuparek and colleagues added a nonionic emulsifier to a dispersion of copolymer butyl meth-acrylate/butyl acrylate/acrylic acid. When cure took place at room temperature, the water resistance of the films increased with the amount of emulsifier added. When cure happened at 60°C, however, the water resistance of the films decreased with the amount of emulsifier added [4]. 

A waterborne interior two piece can coating lacquer would be formulated using resins similar to those described in Chapter II (VII) (resins 1, 2 and 3). However, the lacquer, no matter which type of resin chemistry is available, must meet certain criteria. 

Fone D.W., Polymer Chemistry and Waterborne Can Coatings, Fourth International Tinplate Conference, London, October 10-14th, 1988... 

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