| 摘要 |
Waterborne coating compositions are prepared by combining, in a first embodiment, an epoxy resin, phenolic resin ingredient with, an amino resin, a polysiloxane resin, and emulsifying agent, one or more solvent(s), and water. A second embodiment is prepared by combining each of the above-mentioned ingredients except for the epoxy resin. A desired epoxy resin has an epoxide equivalent weight in the range of from about 400 to 3,800 and has a weight average molecular weight in the range of from about 900 to 20,000. A desired phenolic resin is selected from the group consisting of phenolic resoles. A desired amino resin is selected from the group consisting of melamine and urea formaldehyde resins having a weight average molecular weight in the range of from about 200 to 1,000. A desired polysiloxane resin includes hydroxy-functional polysiloxane resins having a hydroxy functionality in the range of from 1 to 10 percent. The ingredients are added together to form an oil-in-water emulsion having low VOC content. The oil-in-water emulsion compositions is applied to a substrate and subjected to elevated temperature conditions to effect cross-linking between the resin ingredients, forming a protective coating.
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