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The authors studied the dip-coating of aluminum with cold-drying acrylic resin paints containing organic solvents as diluents and the thicknesses of film coated on aluminum in stationary and transient states were observed. The experiments were conducted on 6 kinds of paints and 4 kinds of organic solvents to determine the relations between the partial pressure of solvent and any of residual coefficient and setting time under the following conditions. Withdrawing speed: VW=0.3-30cm/sec. Density of paint: ρ=0.900-0.913g/cm3 Viscosity of paint: μ=0.190-0.386 poise Surface tension of paint: σ=27.0-30.5dyn/cm Partial pressure of solvent: P=3.3-46.7mmHg The values of residual coefficients were in a range of 0.73-0.95 and the setting time was 150-1, 000sec. The following results were obtained by the above experiments. (1) The theoretical formulas in stationary and transient states were applicable to organic solvent paints as well as water soluble paints. However, there was a great difference between the obtained value of film thickness and the theoretical value in the transient state as in water soluble paints when the withdrawing speed was too low. Therefore, the theoretical formulas should be corrected. (2) The partial pressure of solvent was approximately in inverse proportion to the setting time. (3) The relation between the setting time (t) and residual coefficient (K) was expressed by a linear function and K was larger when t was shorter; K≅1 when t=0. (4) According to the above results, it was possible to estimate the value of residual coefficient (K) from the determination of partial pressure of solvent.
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