Download Nonpolluting Coatings and Coating Processes: Proceedings of by Francis Scofield (auth.), J. L. Gardon, Joseph W. Prane PDF

By Francis Scofield (auth.), J. L. Gardon, Joseph W. Prane (eds.)

Ecological requisites are forcing a metamorphosis in tech­ nology of industrially utilized coatings. at the moment sol­ vent-borne coatings dominate this box yet within the following few years swiftly expanding use could be made up of aqueous coatings, electrocoating, solvent-free liquid coatings which are cured by means of U. V.-light or electronbeam, and powder coatings. This monograph describes a few fresh advancements in those new "non-polluting" coating applied sciences. it truly is very unlikely to foretell how colossal a proportion each one of those novel coatings will take from the normal in­ dustrial finishes marketplace which at the moment represents an annual quantity of approximately 1000000000 cash. In all likeli­ hood every one will locate its personal really expert use. we are hoping that this monograph might help the reader to shape a point of view of some of the novel coatings, their approach to software, their merits and their barriers. J. L. Gardon Joseph W. Prane Rahway, N. J.,and Elkins Park, Pa. October 15, 1972 v CONTENTS prestige of pollution keep an eye on Regulations........... 1 Francis Scofield actual Characterization of Water Dispersed and Soluble Acrylic Polymers........................... five William H. Brendley, Jr. and Thomas H. Haag Methylated Urea Formaldehyde Cross-Linking brokers in Aqueous Emulsions............................... 25 Leonard J. Calbo Polymer Parameters Affecting Aqueous Topcoat platforms. • . . . . . . . . . • . . . . . . • . . . . . . . . . • . • . . . 35 . • . . . . . . . .

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Bake Conditions A graduated heating schedule was used in all cases in order to minimize solvent popping which is one of the most difficult problems (see Results and Discussion). The following schedule was used: 1. Initial bake from room temperature to 200°F and held at 200°F for 10-lS minutes. POLYMER PARAMETERS AFFECTING AQUEOUS TOPCOAT SYSTEMS 2. 39 Temperature was then raised to 325-350°F and held for an additional 20 minutes. A closed-loop vapor reflow system was also investigated. Heating was carried out in a number of chlorinated solvents and water vapor (steam).

At higher temperatures even faster cures were observed (Figure 5). Excellent hardness, elasticity and adhesion were obtained in conjunction with good gloss and chemical resistance. Emulsion Stability In Table III the effect of pH on the stability of the catalyzed emulsions can be seen. 3 with ammonium hydroxide, a shelf life of 4-5 days is obtainable with BEETLE 60 methylated urea resin. As expected the shelf stability was much better with hexakis[methoxymethyllmelamine. Although satisfactory for most applications, the limited shelf stability for the methylated urea may be attributed to self-condensation of the available -NH and -NCH20H groups, which, incidentally, are not present in hexakis[methoxymethyllmelamine.

The use of alkali hydroxide could present similar problems that would require similar solutions. Cosolvents contained in ED systems playa major role towards improving film characteristirs. Alcohols, etheralcohols, ketone, aromatic and aliphatic hydrocarbons, have all been used in this respect. Some experts have claimed that the selection of a cosolvent should be based on certain range of values for the solubility of water in a particular solvent and also the solubility of that solvent in water 7 • However, in addition, perhaps some emphasis should also be givp~ to the solubility parameter value of the solvent as compared to that of the resin.

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