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    Home > Coatings News > Pigment and Filler News > What are the factors that cause the color difference of the paint on the wall?

    What are the factors that cause the color difference of the paint on the wall?

    • Last Update: 2021-03-17
    • Source: Internet
    • Author: User
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    I believe that almost all construction teams have encountered such a problem: Why is the color of the paint this time different from the color of the last time? This is the color difference of the paint.


    The main factors affecting the color difference of the coating

    1.


    The thickness of the coating is closely related to the application environment.


    2.


    The volatilization of the solvent affects the surface leveling, gloss, and directional arrangement of the pigments and fillers of the coating, and then affects the hue of the color.


    3.


    In a high-humidity environment, if a drastic temperature change is involved, during the solvent volatilization process, the coating surface will have a temperature difference due to the solvent volatilization, resulting in a thin layer of water mist on the coating surface, causing the coating to whiten and produce color differences.


    4.


    Different pigments have different effects on the color saturation due to the adjustment; the same color is easy to produce stains on the surface of the same board due to different construction methods, different operating habits and other factors, such as the difference in thickness between different boards.


    Reasons that affect the color difference of the coating

    1.


    Floating color: Floating color is adjusted by pigments with a large difference in density.


    Bleeding: Bleeding is the color of the primer being penetrated into the topcoat, and the color of the topcoat is stained and discolored.


    1) There are organic pigments with poor solvent resistance in the primer, which are dissolved by the topcoat and penetrate into the topcoat.


    2) The top coat contains a solvent with strong dissolving power, and the top coat is applied before the primer is fully dried.


    2.


    1) The color difference caused by the floating color of the paint or the color difference caused by the precipitation of the paint, and the stirring is not uniform.


    2) Cross-contamination caused by uncleaned spray tools.

    3) The thickness of the paint film is thinner or thicker than the standard or the baking conditions are incorrect.

    3.
    Inspection standards

    1) Inconsistent standards: different evaluation standards and templates;

    2) Different types of testing instruments or different measuring methods;

    3) Standard board color migration

    4.
    Materials

    1) The materials used are different or not matched, and there is a large color difference between batches.

    2) The substrate is uneven and the surface roughness is different, which will cause uneven absorption of the applied paint and cause color difference.

    3) The original paint on the surface of the coated object has lost gloss and faded, and then repair the spots caused by spraying locally

    Precaution

    1.
    Strengthen the inspection of paint procurement, and the topcoat of the same color should be controlled by one manufacturer.

    2.
    The paint should be diluted properly and not too thin to prevent the paint from floating and bleeding.

    4.
    Clean the tools before painting, especially the paint pipeline when changing colors to avoid color mixing.

    5.
    Minimize paint repair.
    If you need to repair, you should paint the entire part or the surface with a clear dividing line.
    When repairing the old equipment, use the overall repair as much as possible.

    6.
    Before coating, the substrate must be qualified, smooth and have consistent surface roughness.
    7) Drying time and temperature should be strictly controlled within the process time, and the drying and drying specifications should be consistent.

    7.
    The paint should be stirred well before use, especially compound paint, it should be used after the color in the barrel is evenly stirred.

    8.
    The thickness of the paint film should meet the requirements of the process specification, and the testing instruments for different parts should be consistent.

    9.
    The color card should be updated in time, and the standard version management should be standardized to ensure that the paint is fully mixed in proportion.

    10.
    Use the correct spraying method.
    If color matching is difficult, use the "soft" spraying method.

    11.
    Before the formal spraying, spray a board with the formulated paint and observe the same angle from the dispersion of the filler additive resin emulsion under different light, and compare the difference with the original car body color to ensure accurate color matching.

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