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News > Dynamic industry > Paint frequently encountered problems and solutions

Paint frequently encountered problems and solutions

First, the current fall (droop or sag)
1, phenomenon: the film was partially hanging or stacking sagging state.
2, causes and solutions:
(1) coating viscosity is too low, overdilution: should be adjusted to an appropriate viscosity
(2) the gun in the same position too long residence time: should the gun move uniform, homogeneous coating
(3) wall moisture content is too high, humidity, does not absorb paint: base surface should be dry, to meet the requirements of construction, not too wet wall construction
(4) The first pass did not dry feed continuous spraying: first material should be dry after construction of the second track
(5) the size of the uneven pressure gun construction, facing away from the gun and inconsistent: even pressure should be adjusted, the pressure is generally in 0.4-0.7MPa (4-7kg / c m), facing away from the nozzle and generally 30-40 cm, and to maintain constant speed
(6) has flow fall to the surface: the eradication of the blade should be removed, Scraping and repainting

Second, peeled
1. Symptom: poor coating adhesion, to a little external coating that is rendered off phenomenon.
2, causes and solutions:
(1) the surface to be coated unclean: should clean the surface to be coated before painting
(2) the underlying is not fully dry (base or putty): It should be the base plane or putty to fully dry before construction
(3) the nature of the adverse paint: should carefully choose a good paint construction
(4) Putty bonding strength is too low: should ensure firm adhesion layer of putty treatment, can not afford to powder
(5) Every time the film is too thick: it should control the paint film thickness of each pass
(6) on the back cover hardness is too large, the film is too smooth or finish, primer and paint adhesion difference: It should be noted primer and topcoat, in a smooth finish
Layer to choose adhesion, wettability good primer

Third, uplift
1, phenomenon: the erosion of the lower upper coating film, so that the expansion of poor adhesion.
2, causes and solutions:
(1) the first layer of coating is dry, the spray of the second layer of the first layer of paint: brushing the floor should be sufficient to feed after drying
(2) the coating is too thick: it should be a thick coating each coating should be thin, not too thick
(3) The higher the moisture content of grass out of the water: It should be dry before construction
(4) on the lower supporting materials missing: supporting the system should be used materials

Fourth, grain
1, phenomenon: the occurrence of sand sprayed finish undesired attachment
2, causes and solutions:
(1) coating viscosity is too high: it should be appropriate to adjust the viscosity of the paint
(2) when spraying distance is facing too far: working distance should be adjusted
(3) painting environment dirty: dust cleaning process should do their homework first place
(4) coating quality reasons: It should be of high quality paint (Beijing You Lin YS-103 ecological natural raw lacquer is better)

Fifth, crack, crack
1, phenomenon: surface cracks often appear, cracks often occur over the underlying film or substrate, both phenomena are a linear, polygon-shaped cracks or uncertain, fission.
2, causes and solutions
(1) coating the upper and lower sub-systems: should adjust the compatibility between the coating system, be sure to use supporting materials
(2) The undercoat is dry ie secondary construction: Road construction should be carried out under dry after the first material
(3) a spray too thick: the right amount of coating should not be a one-off thick
(4) coating is bad, the lack of ductility carefully choose the paint or plasticizer: It should be of high quality paint (Beijing You Lin YS-103 ecological natural raw lacquer is better)

Sixth, the film roughness
1, phenomenon: dirty surface coating, particulate dotted uneven distribution.
2, causes and solutions
(1) construction environment dirty, dust, sand mixed with paint, there and construction tools debris attached to finish when debris or coating is dry: should not the construction or when there is sand in windy environment, Before construction environment and tools for cleaning up
(2) primary surface is not flat and smooth: sand dust has primary treatment should be smooth and clean
(3) does not paint or construction methods: high quality paint (Beijing You Lin YS-103 ecological natural raw lacquer is better) and the appropriate construction methods

Seven color (white, blur)
1, phenomenon: the same facing different color difference
2, causes and solutions:
(1) paint colors mix: It should be before use of the same batch, the same color No. material small scale, the same color and then used in the same vertical plane point
(2) paint diluted properly, no stir before use: the right amount should be uniformly diluted before use and stirred
(3) Scraping or improper spraying: Apply a direction Scraping, roll, One finishes with the same kind of process, each step must be dry before the next road construction.
(4) After the paint does not dry construction: water intrusion should note before pouring construction construction environment and weather, lacquer overcoat after dry aggregate, do not cover the rain drenched again
Surface, so there will be water marks or blur blush
(5) coating color unevenness or improper selection of raw materials: It should be of high quality paint (Beijing You Lin YS-103 ecological natural raw lacquer is better)

Eight, the coating is too soft
1. Description: The favorable weather conditions, 72 hours after the coating is still used to pull the nails.
2, causes and responses:
(1) Select emulsions inappropriate: should choose a higher bond strength, minimum film-forming temperature is high
(2) Product ratio unreasonable: should adjust the formula
(3) Improper dilution site: uniform should be suitably diluted

Nine, white water
1: After coating drying, water will be white, becomes loose, the sun sun can not restore the original color.
2, causes and responses:
Good water resistance of the coating to absorb the moisture caused: should choose good quality, good hydrophobic emulsion; should select a dedicated thickener; silicone waterproof lacquer was appropriate to join in

Ten, sand off too
1, phenomenon: the construction, in the normal pressure difficult to use, and easy to swap paint sand.
2, causes and responses:
(1) with high hardness, surface smooth sand tighter easy to swap the sand, sand gradation inappropriate: natural sand as far as possible, and there is a certain level with sand
(2) When the paint is too thick construction had difficulty on the sand wall is too thin when the initial viscosity is too low, will cause the sand fall: in the case of construction without difficulty, and to maximize the consistency of paint, to help resolve Sand off problem
(3) emulsion ratio improper content is too low: It should be of high quality latex, correct ratio.

XI, yin and yang corner crack
1, phenomenon: the lacquer coating process, the coating cracks at the corner section of yin and yang.
2. Cause: yin and yang corner stone of two intersecting surfaces, if aiming lacquer spray, in the drying process will be in two different directions tension applied coating yin and yang corner, easily crack.
3. Measures: found cracks Yang angle, try to use a thin coating spray gun, every half an hour and then spray again until the cover cracks, yin and yang, the new spray angle, spray a thin multi-layer method, that the surface is dry then spray, gun distance is far faster movement, and not vertical spray angle of yin and yang, but to use the scattering, the spray two faces, so that the atomization edge material swept into yin and yang angle.

XII plane cracks
1. Symptom: coating the surface of fine cracks
2. Cause: The weather temperature too much, the sudden cold, causing the inner and outer layers of different drying rate, dry surface in a phenomenon quit cause cracks.
3 Responses: switch mouth spray gun, spray thin multilayer, try to control the speed of each drying, spray a little distance away as well.

Thirteen, a film-forming process cracks
Phenomenon: When spraying, covering not uniform or is too thick, cracks in the coating film on the surface, even several weeks after cracks appeared.
Cause:
1. coating formulation problems.
2. grassroots rugged, there are irregularities exist.
3. Wall base change.
Solution:
1. Change the formula, re-trial, pay attention to the construction of spraying.
2. To Scraping formation of a solid substrate.
3. fission process after the construction of the base.

Fourth, pull wire
Phenomenon: Spray painting, coating filamentous phenomenon.
Cause:
1. Paint viscosity too high.
2. solvent evaporation is too fast.
3. small-caliber gun, the pressure is too high.
Solution:
1. supporting the thinner adjust viscosity.
2. The use of lower volatility solvents.
3. The use of larger caliber gun, adjust the pressure.

Fifth, paint waste
In the coating application process, waste paint to make the process as originally scheduled amount can not be estimated with the master and improve operating costs and reduce corporate profits and affect the quality of the decoration process phenomenon.
Causes and Countermeasures:
1, do not understand the characteristics of the coated object to be coated misjudged a thorough understanding of: the correct estimate should live
2, do not understand the nature of the cause paint to redo: The paint should be aware of the technical nature of the job, carefully choose the system
3, the operation unskilled and bad habits factors: should enhance the operational techniques, to form good habits
4. After each coating, still pulled the trigger gun trigger: It should be flexible and appropriate control
5, spray angle, distance is wrong: should adjust the spray angle and distance
6, the nozzle and air barrel improper use: should choose the most suitable spare parts
7, the pressure is so high that the coating thickness uneven: adequate pressure should be adjusted so that the coating uniformity
8, the tool caused by improper use: should choose the right tool for
9, engineering operations management and rectifying poor: should implement administrative details, good clean finishing construction inspection, acceptance

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