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    Home > Coatings News > Paints and Coatings Market > Is the color difference caused by the paint on the wall a problem with the paint?

    Is the color difference caused by the paint on the wall a problem with the paint?

    • Last Update: 2020-12-07
    • Source: Internet
    • Author: User
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    I believe that almost all construction teams have encountered a problem: why is the color of the paint this time and the color of the last paint is somewhat different? This is the color difference of the paint. Color difference: due to the coating of the film color, brightness, color and standard board or the overall color, brightness, color differences.
    the main factors affecting the color difference of the coating
    (1) coating thickness
    the thickness of the coating is closely related to the application environment
    the
    . The color of the substrate, the gloss change caused by the change of thickness and other factors in the coating color adjustment and even the coating process must be considered fully.
    (2) solvent volatility rate
    the volatility of the solvent affects the surface leveling, gloss, and directional arrangement of the paint fillers of the coating, which in turn affects the color of the color.
    (3) solvent hydro-hydrosolve
    in high humidity environment, if the temperature is involved in drastic changes, in the process of solvent evaporation, the coating surface due to solvent volatility and temperature difference, resulting in the coating surface rich thin layer of water mist, resulting in the coating whitening and color difference.
    (4) coating uniformity
    different pigments due to the color saturation of the adjustment of different degrees of influence, the same color due to different construction methods, different operating habits and other factors easily produce color spots on the same plate surface, thickness differences between different plates and other color depth, these factors can only rely on operating procedures or proficiency to overcome.
    Cause
    01
    Paint itself causes floating color, seepage
    floating color: floating color is made of pigments with large density differences, easy to produce pigment distribution differences in the upper and lower layers, so that the coating surface and internal color is inconsistent. Such as carbon black-titanium-white-toned gray paint, titanium-blue-titanium-white-toned light blue paint. The uneven evaporation of solvents during wet film drying causes conflowal phenomena caused by poor surface pressure, which is the driving force for the production of floating colors.
    : permeable color is the color of the primer is seeped into the paint, is the color of the paint is stained and changed color.
    1) primer also contains solvent-resistant organic pigments, which are dissolved by the paint and deep into the paint.
    2) paint contains a solvent with strong solubility, and the primer is not dry enough to paint.
    02
    construction process
    1) due to paint floating color caused by color difference or due to paint precipitation caused by color difference, stirring is not uniform.
    2) Cross contamination caused by the spray tool not cleaning.
    3) The thickness of the paint film is thin or thick compared to the standard or the baking conditions are incorrect.
    03
    standards
    1) are inconsistent: different evaluation standards, different models,
    2) different test instrument models or different measurement methods,
    3) standard board color migration.
    04
    materials
    1) use different materials or do not match, there is a large color difference between the batches.
    2) substrate is uneven, the surface roughness is different, the coating will be absorbed unevenly, resulting in a polycolor color difference.
    3) The original paint on the painted surface has been lost, faded, and then the spots caused by local repair spraying.
    precautions
    1) to strengthen the paint procurement inspection, the same color of the paint should be controlled in a manufacturer.
    2) coating dilution should be appropriate, not easy to thin.
    3) to prevent paint floating color and seepage.
    4) before coating the ground cleaning tools, especially when changing color paint lines must be washed, to avoid mixing color.
    5) less paint, if you need to make up, should be the entire part or a clear line of surface paint, old equipment repair as far as possible to use the overall repair.
    6) Coating pre-substrate to be treated qualified, flat and surface roughness consistent. 7) The drying time temperature should be strictly controlled in the process time, and the drying and drying specifications should be consistent.
    8) paint should be fully stirred before use, especially composite paint, should be in the barrel color stirred evenly before use.
    9) paint film thickness to compound process specification requirements.
    10) different parts of the detection instruments should be consistent.
    11) color cards should be updated in a timely manner, standard version of management to be standardized.
    12) using the recommended materials.
    13) Ensure that the paint is fully mixed proportionally.
    14) using the correct spray method, if the color matching is difficult, you can use the "soft" spray method.
    15) Before formal spraying, spray a plate with a well-provisioned paint and spread the resin emulsion from the filler additive in different light to observe at the same angle, comparing its difference with the original body color to ensure accurate color matching.
    16) use the manufacturer's color code to select the correct color formula.
    warm reminder
    in short, for the painting refresh problems, we must find a professional construction team construction Oh, through the above introduction can be seen, the cause of color difference there are so many, if not professional construction team is difficult to avoid, in case the brush out of the color difference is too big to lose.
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