Classification of coatings: color penetration of coatings

Core tip: the phenomenon of color permeating refers to the phenomenon that the surface coating dissolves the bottom coating and causes the color of the bottom coating permeating into the surface, making the paint film present color or discoloration The phenomenon of color penetration can occur immediately after the application of the paint film or at any stage of the drying of the paint film The coatings prone to color penetration are: asphalt paint, acrylic paint, epoxy ester paint, nitro paint, organic red or yellow paint with poor solvent resistance The causes of color penetration of paint film are as follows: ① The color penetration of paint often occurs in the matching of deep primer color and light finish color Pigment or asphalt resin in primer coating Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Paint Home News: the phenomenon of color penetration refers to the phenomenon that the surface coating dissolves the underlying coating, causing the color of the underlying coating to penetrate into the surface, making the paint film present color or discoloration The phenomenon of color penetration can occur immediately after the application of the paint film or at any stage of the drying of the paint film The coatings prone to color penetration are: asphalt paint, acrylic paint, epoxy ester paint, nitro paint, organic red or yellow paint with poor solvent resistance The reasons for the phenomenon are as follows: ① the deep primer color and the light finish color are often used in the coating matching The pigment or asphalt resin in the primer coating is dissolved by the top coat to make the color penetrate into the top coat If the white top coat is applied on the red or brown primer, the top coat will turn pink or gray ② During construction, the primer is not completely dried or the top coat with strong solvent is applied to make the bottom paint film dissolve For example, when spraying nitrocellulose coating, the primer of the lower layer sometimes passes through the top coat, so that the original color of the upper layer is polluted ③ In the bottom layer, the material with very slow drying is used, such as priming with large paint or asphalt type paint, and then painting, and the paint spots of asphalt or large paint will appear on the paint surface ④ before painting the primer, in order to remove the oil, turpentine, red mercury and dye on the surface of the object, the painting on the wood and copper surface is prone to color penetration Prevention and control measures: ① a light color primer of similar color can be used, and an intermediate layer of transition color can be added to the primer, and then a white finish can be applied In case of color penetration, a layer of top coat can be applied after the coating is dry to cover the color penetration ② During construction, the top coat shall be selected according to the above matching principle, and the paint containing strong solvent shall not be used as the top coat There shall be a certain time interval for painting to make the primer fully dry When coating strong solvent coatings of different colors, the amount of diluent should be appropriately reduced, and the coating should be thin to make the film dry quickly When spraying nitrocellulose paint, the construction shall be stopped immediately, and the dust shall be polished and wiped off after the paint film is dried, and shellac varnish shall be applied for isolation ③ It is better not to use the very slow drying paint putty or asphalt coating as the primer After the primer dries completely, the top coat can be applied, and the middle coat can be added at the same time; flake pigments (such as aluminum powder) can be added to the middle coat or the top coat to prevent the solvent color penetration of the top coat; the solvent with fast volatilization rate and small dissolving capacity to the bottom paint film shall be used ④ Before painting primer, it is necessary to thoroughly remove oil, turpentine, asphalt, red mercury, dye, etc For wood surface color penetration, a layer of shellac varnish shall be applied in advance to isolate the dyeing agent, or the corresponding color paint shall be changed flexibly ⑤ The phenomenon of color penetration affects the appearance of the coating, but generally does not affect the anti-corrosion protection effect Another top coat can be applied on the color penetrating top coat, or the intermediate layer can be applied, and then the top coat can be applied For the coating with high decorative requirements, the color infiltrating part can be polished evenly with fine sandpaper, and the corresponding top coat can be applied Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,