Determination of "leveling" properties of varnishes and enamels
Determination of the "leveling" properties of varnishes and enamels. After brushing varnish or enamel on the surface, the brush strands left on it should disappear completely after a period of five to form an extremely complete and quasi-slip surface of the applicator bar, ie The varnish must be a "leveling" varnish or a "painted" property of the lacquer can be considered as: Temporary Fence,Pvc Portable Fence,Pvc Temporary Fence,Security Construction Fence HeBei Bosen Metal Products Co.,Ltd , https://www.bosenfence.com
1) If the varnish or lacquer is “painted†no later than 10 minutes after painting, it is qualified; (Related instruments: leveling instrument)
2) If the varnish or the lacquer is after the brush, after 10 to 15 minutes of DIN cup "leveling", it is considered to be slow;
3) Electronic balance If the varnish is magnetically delivered, it will be considered unqualified if it is not “leveled†after 11 minutes in 15 minutes.
According to OCT18159-40, after the brush is removed, all oil-based varnishes must be removed no later than 10 distributions.
When the paint material is removed by spraying, it is necessary to determine whether the sample has a uniform, smooth, wrinkle-free (ie, skinned) film on the surface. Kiselev pointed out that the direct cause of poor varnish leveling is caused by insufficient grinding machine (the tax is not enough) when the oil dispersing machine is lacquered, and the leveling (or flatness) of the varnish enamel paint. Depends on its surface tension.
The lower the surface of the varnish, the better the wetting surface. The varnish is easier to flatten ("leveling") when other conditions are the same (viscosity, temperature, etc.). (Related instruments: Viscometer)
According to Debjerg, in addition to viscosity and surface tension, the vapor pressure of the falling agent also affects the leveling of the varnish. When the vapor pressure is high, the evaporation time of the solvent is shorter than the time for the varnish to level on the surface. Producing an uneven paint mould, De Linberger also relates the leveling of the varnish to the fluidity of the varnish base. If the solvent has evaporated and the flow of the varnish base is good, the leveling of the clear will It is also very good.
If the surface tension is reduced by the addition of dibutyl, the leveling performance of the varnish can be improved.
The leveling property of the fiber ester varnish and the color paint can be improved by adding a high-sinking solvent to reduce the jelly process of the paint film. In order to improve the leveling of the oil-based varnish and the magnetic depth, it is preferable to use some low Molecular acid, such as benzene (meth) acid.
Korlovsky and Kozulin pointed out that the paint with good leveling must have good stability (when the shear stress is not large) and relatively high fluidity, and the well must have such a constructional viscosity: At this viscosity, before the formation of the film, the flow of the solvent is terminated by the process of the film itself.
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