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Service > The new paint film diagnosis and analysis

The new paint film diagnosis and analysis

1, crust
Futile in the container storage, due to the oxidative polymerization to form a coat of paint on the surface of the phenomenon known as skinning. The reason is; oxidation due to excessive drying paint driers, polymerized tung oil contains large amounts of excess paint unfilled or leak or excessive temperature storage for too long will have a crust.
2, thickens
Increasing the viscosity of the coating in the storage, it becomes difficult to thicken the phenomenon known construction. The reason is; the paint is too high acid value, saponification with basic pigment occurred; barrels leak. Solvent evaporation; barrel mixed with water or water containing a pigment; storage temperature is too high, so that the paint accelerate the polymerization; storage temperature is too low, particularly aqueous coating susceptible to cold precipitate.
Preventive measures; supporting dilution adjustment can add, add the right amount of water to alcohol, stir to adjust the viscosity of use, which is to follow the conservatory store 2-8d let thaw recovery.
3, precipitation caking
Particulate pigment, extender pigment paints, etc. appear in precipitation or by mixing a morbid difficult to re-disperse dense lumps become agglomeration precipitation may be due to a pigment or pigment grinding system is not small, dispersed pigment and binder bad or occurrence physical and chemical reactions caused by other reasons. In the painting, the precipitate remove grind then add the original mix, filter use.
4, sagging
Paint on a vertical surface construction, liquid paint flowing to the following phenomenon called sagging. The reason is that the paint is too thin, the viscosity is too low, slow drying, paint pigment too heavy or uneven dispersion, spraying too close, poor adhesion to the substrate, paintbrush too sticky paint, paint over thick, the construction of the temperature too high drying paint to dry up without leveling, are sagging reasons.
Precautions: discretionary application viscosity increase, adjust spray pressure increases peaceful proper spraying distance, a coating thickness control in about 30um, can prevent and reduce sagging.
5, bottom bite
Upper paint will soften the underlying paint film from the phenomenon known bite bite at the end. Reason: not dry primer, paint solvents too top; bottom paint is not complete and so on.
Preventive measures: to be a primer to dry or dry and then painted finishes second, the second solvent used to paint with primer matched.
6, slow dry and sticky back
After the coating application, the coating dry quit or back of the phenomenon known as sticky and slow drying sticky back within the stipulated time. Causes: poor volatile solvents, paint does not dry on topcoat; construction temperature is too large, the temperature is too low, the surface treatment is not clean, stained with oil and waxy substance, turpentine, wood sections not stay closed; paints impurities or leak into the chaos plus driers, etc., are slow to produce dry and sticky return reasons.
Precautions: painted sheet front surface should be free of oil, water, dust and other impurities, each matched paint and thinners should avoid painting construction relative temperature is too high or too low temperature, moisture may need to add the appropriate agent based on the construction environment two-component coatings must be strictly in proportion to the deployment.
7, from the grain
After the coating application, the coating surface is not smooth and fine particles produced from a phenomenon known as grains. The reason is: the production of pigment grinding is not fine, did not reach the required fineness; there is cohesion, the construction environment and tools dirty or storage; paints and solvents do not match, and speech generation microgel; nozzle diameter is small, pressure large standoff distance is too large, when feeding into chaos again unfiltered mechanical impurities and physical surface treatment without a net and so on. Preventive measures can be taken according to its cause.

8, whitish
Whitening loss of light or no light spots produce the phenomenon known as the film has a dry white. The main reason is the construction too much humidity (RH> 80%) and solvent evaporation is too fast so that the coating surface temperature falls sharply, so that water vapor condensed in the MR film so that the resin or cellulose precipitated cause blushing. General Quick-drying paint volatile type (such as nitro, perchlorethylene, thermoplastic acrylic, etc.) due to the presence of a large number of low-boiling solvents and thinners, to help easy white.
Improvement;
Tide and the amount of agent a high boiling solvent (e.g., butanol) to adjust the solvent formulations, or improve the construction environment, air to remove moisture etc. can be prevented whitish. Shellac coating and hot items (such as Sheng cups boiling water) contact will be white with cotton wool dipped in alcohol or dilute white worm glue arrangements in place, that is able to recover.
9. Flooding
Complex or dry paint film, coating color and tone be some uneven phenomena (such as yellowing, floating color, gold pan, etc.) is called flooding in the painting process. This is mainly due to the different densities and particle size pigment and a pigment poor lubricity, high hygroscopicity, oil absorption amount and color (e.g. scarlet) causes partial dissolution. In this case the replacement of dry material can be added to improve this situation can be added the right amount of protective colloid (ethyl cellulose, polyvinyl alcohol, etc.) or oil (polydimethylsiloxane), etc. can be improved and resolved.
10, wrinkles
Beyond the early wrinkles, dry coating sharp contraction in addition many bent ridge Ling phenomenon known wrinkles. Dry mismatches or add too much, in the outer coating of dry quit, the coating is too thick, the outer layer of the existing conjunctiva, film exposure or under high temperature baking in the hot sun, etc., will cause the film to wrinkle. If this happens, can be used to replace the dry material.
Improvement; improving construction conditions and other methods to solve them, alkyd amino resin material can add a little to prevent wrinkling.
11, Orange
Orange is a film formed on the surface of many semi-cellulite disease as disadvantages. The reason is that; when spraying viscosity is too high, the pressure is too big, too small caliber, spraying too close, too low boiling point solvent when its rapid evaporation leaving no time leveling liquid paint will produce cellulite.
Improving; appropriate choice of solvents, construction viscosity, pressure, nozzle size, spraying distance should be appropriate, the baking temperature is not too fast, the surface to be coated should be below 50 ℃, a construction thickness control at 20-30 um.
12, contraction
After the coating application, the coating surface contraction, like the water and put it on wax paper like speckled, while exposing the phenomenon known as the contraction primer, also called "laugh", "pitting." Mainly due to the poor lubricity coating is coated on the surface, so it can not form a uniform film, shrink into Bubble-like; the surface is too smooth, too much gloss paint, body surface stained with oil or by smoke smoked; spraying equipment mixed with oil or water; solvent evaporation is too fast, too late to leveling coating; spray density is too large, the occurrence of splashing paint, etc., will cause the coating to shrink.
Shrinkage is common in the varnish, red lead paint, polyurethane coatings, epoxy coatings and pure phenolic resin coating. Adding a suitable additive can improve the coating shrinkage phenomenon.
13, pinhole
After drying the coating exhibits a surface such as needle-like holes, called pinholes. Reason: dry too fast, was painted quickly into high-temperature baking, bottom is dry topcoat, construction viscosity is too high, the surface treatment is not clean and contain the oil, water, dust and other impurities. Precautions: strict drying temperature and time specified by the coating process for drying, drying from the cold zone should gradually into the hot zone, according to the deployment of suitable viscosity paint spraying, a coating thickness not too thick, pre-treatment should be clean and free of impurities , and not to let the way of oil, water, dust and other impurities mixed with paint or solvents, has appeared on the pinhole available Scratch putty way to remedy.
14, foaming
Coating the surface of the vesicles of different size circular bubble phenomenon known as the main reason of this sick immediately after entering the high-temperature baking paint, the bottom is dry topcoat, construction viscosity is too high, the surface treatment is not clean which contain oil, water, dust and other impurities.
Precautions: strict drying temperature and time specified by the coating process for drying, drying from the cold zone should gradually into the hot zone, according to the deployment of suitable viscosity paint spraying, a coating thickness not too thick, pre-treatment should be clean and free of impurities , and not to let the way of oil, water, dust and other impurities mixed with paint or solvents used in paints, solvents should be coordinated.
15, open at the end
After the dry film coating, paint colors could not cover the substrate, the coating is too thin obvious phenomenon called open at the end. The main reason is the paint pigment or hiding bad enough; plus much thinner construction; the paint was not stir, coating is too thin and so on.
Improvement; strong selection hiding pigments, stir evenly when using construction deployment appropriate viscosity, coating thickness control in 20-30UM.
16, bleeding
The primer coat to dissolve, so that the color of the primer to penetrate into the surface known as bleeding, also known as bite color. When applied to light-colored paint on the red paint or bitumen, often this phenomenon. Mainly primer is dry, paint primer paint dissolved; primer containing dyes, asphalt sealer coat and no bleeding will occur after the topcoat.
Preventive measures; use each coat paint thinners should be coordinated, after drying coated bottom floor, the middle layer, the surface layer of color do not differ too much.
17, loss of light
After drying the paint film after a short time (hours or days) shiny slow disappearance of the phenomenon known as loss of light. Outdoor paint, after a long exposure to light and lose the phenomenon was not among them. The main reason; oil, the amount of resin compatible with each other as well as inadequate or inappropriate degree of polymerization; much thinner amount; cold weather or high temperature construction; construction after baking, thinners not play to a certain extent into the drying room; painting After the case of atmospheric smoke; the object surface treatment or primer does not dry like.
Preventive measures; use each coat paint thinners should be coordinated; in strict accordance with the drying temperature and time specified dried coating process, drying should be converted from low temperature; grinding time to choose the right emery cloth and grinding, sanding residue after Dust should be cleaned; there should be no pre-processing of oil, embroidery, water and dust and impurities.
18, chalking off
After paint drying surface color bleak, that touch the stick in the hands of the phenomenon known as powder. The main reason is; the surface treatment is not clean, the presence of oil, water and other contaminants; drying stable too high or fast access to high-temperature baking, the primer is dry topcoat; selection of diluent is not set; paint coating using large viscosity layer is too thick; paint viscosity is too low and too thin to use; not leaving the baking temperature powder coating zoom off.
Precautions; pre-treatment should be thoroughly free of oil, water and dust and impurities, according to the workpiece to be coated material, thickness, size, shape, drying property, heat, temperature control, accuracy select the drying temperature and time.
19, cracking
Coating the surface of the size of the different shades, like Tortoise phenomenon known as cracking. If the coating using a fairly long cracks appear, which is coating the natural aging process, indicating the need recoating coating failure, not a disease. Mainly primer coat is not complete, the film by the external effects (mechanical action, temperature variations, etc.) caused by shrinkage stress, if short oil alkyd paint on long oil alkyd primer easy to crack. Also coating species selection is not complete, mistakenly or modified phenolic epoxy, asphalt and metal surfaces for exterior primer coating for wood. Volatile full paint too much, poor adhesion, too dry or drier amount of pigment, are continuously repair the old coating, too much paint layers, the coating is too thick, harsh construction environment, when the painting is not The pigment, stir are prone to cracking.

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