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Epoxy modified water soluble alkyd resin
Epoxy modified water soluble alkyd resin
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机译：环氧改性水溶性醇酸树脂
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摘要
A water-soluble resin is formed by reacting together (A) a product with acid number 25-80 obtained from (a) a partial ester of a monocarboxylic acid with a glycidyl ether of a di-hydric phenol, and (b) a polyhydric alcohol and a polycarboxylic acid or anhydride, and (B) a neutralizing agent which is a primary, secondary or teriary aliphatic amine or ammonia. All the ingredients of component A may be reacted simultaneously or the glycidyl ether may first be reacted with the monocarboxylic acid and then with the polyhydric alcohol and polybasic acid. Suitable glycidyl ethers are available under the names "EPON," "ARALDITE" (Registered Trade Mark) and "EPI-REZ." The monocarboxylic acid may be a free fatty acid from an oil, or may be added as a natural oil. Tall oil fatty acids are also suitable. Polyhydric alcohols mentioned are glycerine, ethylene glycol, trimethylolpropane, and 1, 1, 1-trimethylolethane. Polybasic acids and anhydrides mentioned are phthalic, sebacic, azelaic, adipic, succinic and maleic. Suitable bases are b -dimethylamino ethanol, diethanolamine, diethylenetriamine, triethanolamine, ethylene diamine, propylene diamine, morpholine, piperidine, triethylamine. In Examples (1) and (2) an epoxy resin is esterified with linseed fatty acids. 1, 1, 1-Trimethylol-ethane and phthalic anhydride are added and heating continued. The resulting alkyd resin with acid member 58 was neutralized with aqueous dimethylaminoethanol; (3) is similar but uses soya fatty acids, and some isopropyl alcohol and butyl "Cellosolve" (Registered Trade Mark) are added at the neutralization stage; (4) is also similar using mixed linseed and tung oil fatty acids and neutralizing with trimethylamine in aqueous butyl Cellosolve. The other examples are generally similar. The organic solvent added at neutralizing stage ensures a clear aqueous solution. Diacetone alcohol may also be used for this purpose. The modified alkyds are film-forming and become hydrophobic on heating.
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