Powdering
Phenomenon: There is a thin layer of powder on the surface of the coating.
Reasons: 1) Interior wall paint used outdoors, such as epoxy paint;
2) excessive dilution, the film is too thin, the resin can not effectively bond the filler;
3) The substrate is too loose, too much resin infiltrate into the substrate, can not effectively bond the filler;
4) The substrate temperature during construction is too low and the film formation is poor;
5) The humidity in the basement and environment is too high, the recoating time is short, ventilation is poor, and complete film formation cannot be achieved;
6) The base is too alkaline and the paint film is destroyed;
7) The filming period is not enough for 7 days when testing;
Treatment methods: 1) Eradicate and clean the pulverized layer;
2) choose the right coating;
3) Follow the construction regulations and do not over-dilute;
4) If necessary, use D05 anti-alkali primer to seal the substrate;
5) Ensure that the construction environment meets the construction requirements.
Blistering, peeling
Phenomenon: The film bulges into foam or breaks into skin.
Reasons: 1) The base putty is mainly made of gypsum powder, talcum powder, and fly powder. When it is in contact with water, it expands and the paint film rises up.
2) The base water is too high and its pressure pushes up the paint film when it spreads outwards, especially products with poor air permeability;
3) Poor water repellency in civil construction causes rain water to enter the base through cracks or unpainted basal surfaces, or there is water leakage and the paint film is damaged when dispersed.
Treatment methods: 1) Eradicate all blistering and peeling. If it is due to putty cause problems, remove putty and re-scrape with proper putty;
2) Follow the construction specifications and do a good job of waterproofing the basement. Repair the basement cracks before construction to ensure that the moisture content of the basement meets the construction requirements. If necessary, add a layer of paint to the area to ensure that rainwater is not allowed to infiltrate.
Fading and discoloration
Phenomenon: Uniform or non-uniform color change of the film, especially red or yellow.
Reasons: 1) Organic pigments have poor weatherability and discoloration under ultraviolet irradiation;
2) The base is too alkaline, and the pigment in the paint film will be destroyed after seeping;
3) The salt alkali precipitates on the surface;
4) Dark color If the paint film is powdered, it will show a lighter color.
Treatment methods: 1) Use darker colors, usually have better weather resistance and alkali resistance;
2) Follow the construction specifications to ensure that the basicity of the base conforms to the construction requirements, especially after the repair;
3) Mount the substrate with a suitable primer.
Alkaline invincible
Phenomenon: The appearance of salt and alkali on the surface of the coating film forms white sag on the surface or damages the film adhesion.
Reasons: 1) The base water, alkali or salt content is too high, the water vapor will bring out the salt and alkali and precipitate on the coating film bottom or surface;
2) The poor water repellency during civil construction causes rain water to enter the base through cracks or unpainted basal surfaces, and saline alkali is taken out when spreading.
Treatment methods: 1) Eradicate all the paint films that are affected and lose their adhesion. After the walls are fully dried, wash them with oxalic acid and wash them with water. Dry them before painting.
2) It is forbidden to use sea sand in civil construction;
3) Follow the construction specification, make a basement waterproof layer, and repair the cracks on the basement before construction to ensure basic conditions
Meet the construction requirements;
4) Mount the substrate using a suitable primer.
water
Symptoms: The side looks at the coating and finds irregular patches on the surface, which are less glossy.
Reasons: 1) Base water content is too high;
2) There is water leakage and water seepage;
3) The environment humidity is too high during construction.
Treatment methods: 1) Ensure that the substrate is dry;
2) Ensure that there is no water leakage or seepage;
3) Ensure that all conditions meet the requirements during construction;
4) If necessary, choose a suitable primer for sealing.
Pinhole, air bubbles
Phenomenon: There are needle-like holes in the film or air bubbles float or float in them.
Reasons: 1) The substrate or putty is too porous and contains air;
2) The surface temperature of the substrate is too high or it is sharply heated and dried after brushing;
3) The film is too thick or not dry to recoat;
4) Do not set the spray gun when spraying, the pressure is too high;
5) Use inferior hair rollers when roller coating;
6) Brush moves too fast when brushing;
7) The paint before painting is not defoamed by vigorous stirring.
Pinhole: (1) The viscosity of the paint is too high and the stirring time is too long. The air cannot be put into the paint.
2. The surface of the work surface is covered with oil and water.
3, spraying air pressure, small diameter, spraying distance.
4, the coating is too thick, solvent evaporation is difficult.
5, the construction site temperature is high, the temperature is high. )
Bubbles: (1) Oil and water on the surface of the object to be coated.
2, the paint itself poor water resistance.
3, wood moisture content is high, without drying treatment.
4, the use of thinner irrational, too volatile.
5, after drying in high temperature, high humidity for too long.
6, the coating is too thick, solvent evaporation is difficult. )
Treatment methods: 1) After drying, the affected paint film is polished and recoated;
2) Make sure that the paint film will not be too thick at one time and it will be recoated after it has dried;
3) Use a suitable primer to seal the substrate;
4) Use high quality short hair rollers;
5) Correctly set the spray gun and control the brushing speed;
6) If the paint is stirred vigorously, it should be defoamed and then brushed.
Pinhole: (1) Appropriate viscosity of the paint is formulated and put into use after a period of time.
2, the work surface clean and then construction.
3, adjust the air pressure, generally 0.6mpa, master the spraying distance.
4, a coating can not be too thick, no more than 30um.
5, properly add moisture-proof agent, slow dry water. )
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