Studies on the preparation of a binder for paints applied by the anodic electrodeposition method
The binder is an adduct o low -molecular mass polybutadiene with maleic anhydrie (BM) modified with a phenol - form aldehyde resin. It is used in water -dilutable pain s applied by the anodic electrodeposition method . The effect of the amount of BM used in the synthesis of adduct, type of an agent used for splitting the anhydride ring in the adduct (water and primary alcohols have been used), type of modifying phenolic resin (used in an amount of 10% by weight per dry mass of adduct) and composition of solvents used for the dilution of the binder on the properties of binder, water solution of paint, and paint coatings has been investigated. An increase in the amount of BM improves the mechanical and protective properties of coatings.The best results in this respekt have been obtained by using 18—20% by weight of BM in respect to polybutadiene. The type of agent used for splitting the anhydride ring has an effect both on the throwing power of paints and on the appearance and properties of coatings. Methanol appeared to be the best splitting agent. The addition of thermosetting phenolic resin has improved the appearance of cured coatings and influenced the throwing power of paints, and hardness, impact resistance and chemical resistance of cured coatings. In this respekt the Best results have been obtained with a modified resol resin.The composition of solvents for the binder has influence maliny the throwing Power of paints. From among the solvent compositions investigated, the following systems have been selected:ethylene glycol monoethyl ether and diacetone alcohol or ethylene glycol monoethyl ether and isopropanol (70:30).
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