Pinholes: Symbolic and origin analysis pinholes refer to the film oral needle pierced by the small pores, all leather pores, pore size is also a few millimeters poor. In view of the poor refinement of varnish, containing impurities; uneven dispersion of pigments; poor oral tension of paint, poor pay fluidity poor bubble release; paint solvent volatilization, and the amount of more; paint eternal; After a long time stirring into numerous micro-bubbles; Lacquer-based poor mutual solubility, with the encounter of temperature drops and local precipitation or upward, easy to produce pinholes.
Measures should be taken to master the emulsiveness and construction technology of the coatings for construction, formulation and diluent of the coatings, improper and too thick film spraying, and caution should not be taken into the film when the humidity is too poor or when spraying.
Shrinkage Pore: Symbol and reason analysis When the oral tension of the coating and the substrate oral poor, easy to change into the coating on the substrate wettability, poor angle, so that the coating has retained dropwise object and exposed the surface, pore size is usually 0.1-2 mm. Very few varnishes and pigments are colored paint, relatively simple to appear this lack, and not easy to repair.
Such symbols are caused by the paint itself, such as poor oral tension, poor fluidity, poor wetting and poor bubble release; paint mixed with oil dirt such as shrinkage atmosphere of oil-water mixed coating, the underlying coating contains silicone oil additives; there are also oral reasons for the substrate, such as the underlying oral oil dirt or water when the film does not become wet. Good; greasy old paint film is also easy to make the film wet bad; the base oral tension is too low appear wet bad; in addition, the construction encountered a dirty atmosphere, wet film by water, oil and other splashes are insulted can be reduced to shrinkage.
Measures to do a good job at the grass-roots level, further employment must not have dirt; mediate the variety and formula of paint; careful construction of the periphery encounter; oral greasy old paint film given appropriate grinding to remove the low polarity layer.
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