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    Home > Coatings News > Paints and Coatings Market > Pull-out method adhesion test, these details have you noticed?

    Pull-out method adhesion test, these details have you noticed?

    • Last Update: 2020-12-11
    • Source: Internet
    • Author: User
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    Regarding the pull-out adhesion test, the current commonly used national standard method is:
    GB/T 5210-2006 color paint and varnish pull-out adhesion test
    the operating steps are as follows:
    samples or systems are applied to the substrate with uniform thickness, drying/After curing, the test column is glued to the coating surface with adhesive, after the adhesive is cured, the adhesive and coating are cut along the test column periline with a suitable tool to the substrate, and then the test combination is placed on the pull test machine for a pull test to measure the required pull force to destroy the coating/substrate attachment.
    test process should be noted:
    , according to the type of substrate, choose the suitable test combination
    there are three types of test combination:
    combination 1 - the test method commonly used on hard and deformable substrates (using two test posts)
    put the test plate in the middle of two surface adhesive-coated test columns, two test posts should be located in the center of the test plate and the same axis arrangement.
    :
    1 - Test columns coated with adhesive;
    2 - Painted substrates
    Chinese
    .
    2 - a method of testing from one side using a single test post (only for hard substrates)
    connects the surface of the test column coated with adhesive to the coating.
    :
    1 - Outer Ring;
    2 - Test Column Coated with Adhesive;
    3 - Coating;
    4 - Substrate.
    Combination 3 - Test column method, where one test column is used as a painted substrate

    :
    1 - Painted test column;
    2 - paint film;
    3 - Adhesive;
    4 - Adhesive test post.
    the actual testing process of the laboratory, there were more cases of selecting combination 1 and combination 2 for testing, and there were fewer cases of selecting combination 3 for testing.
    for easy-to-deform substrates, such as thin metals, plastics, wood, select combination 1 for testing.
    for hard substrates, such as thick concrete, thick metal plates, select combination 1 and combination 2 for testing can be carried out.
    for specific situations, such as the need to avoid substrate deformation, which may have a greater impact on the results, you can choose combination 3 for testing.
    depending on the type of coating, the adhesive selected for the suitable adhesive
    should meet the following requirements as possible:
    - the cohesion and adhesion of the

    adhesive is superior to the cohesion and bondability of the coating;
    damage of the adhesive itself or the bond between the adhesive and the test column (the destruction form is Y, Y/Z), the selection of other adhesives should be retested.
    the adhesive curing period, the fixed position does not move
    to ensure that the test combination between the parts of a continuous, solid bonding surface.
    cutting operation ensures that the adhesive and coating to the substrate
    adhesion results in the adhesion between the coating or between the coating and the substrate when the adhesion is destroyed in the unit area of the required pull, in megapa (MPa). Cutting the adhesive and coating to the substrate along the test column per-line can guarantee the effectiveness of the test results.
    exception to the standard: no cutting is permitted only if the thickness of the coating system is less than 150 m and the parties involved agree.
    . Results are not misjudged
    When observing the form of destruction, it is necessary to have a clear understanding of whether the single coating or composite coating being tested, and if it is a composite coating, it is necessary to identify the composition of the coating system (e.g. primer, intermediate paint, finish or first coating, second coating... ) to avoid miscalculation. Example: If the composite coating applied to the steel plate is applied (bottom, medium, surface matching, and the bottom, medium and surface colors can be distinguished), then A is not possible in the destructive form of the test, the possible forms of destruction are A/B, B, B/C, C, C/D, D, D/Y.
    the type of test machine equipment and the type of test combination have a great influence on the results of the pull-out adhesion test, and the results of different types of equipment, different test combinations and tests vary greatly. In addition, using the same equipment, the same combination, the value of the test results and the form of destruction and substrate, selected adhesive is also directly related. Therefore, the report test results should be reported at the same time should indicate the type of test machine, the combination of choice, substrate, selected adhesive and other information, so as to scientifically evaluate the coating or coating system attachment effect or coating system matching advantages and disadvantages.
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