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    Home > Coatings News > Paints and Coatings Market > Eco-friendly anti-corrosion polyester resins are used in powder coatings

    Eco-friendly anti-corrosion polyester resins are used in powder coatings

    • Last Update: 2020-12-26
    • Source: Internet
    • Author: User
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    Powder coatings are preferred to conventional solvent-based and water-based coatings. Powder coatings have environmental advantages and obvious economic benefits. The reason for this is that powder coatings are
    100
    % solid, solvent-free components that can be used by almost
    100
    % in the process. What's more, they have high performance.
    Corrosion Protection
    as a global market leader,
    DSM
    powder coating resins are dedicated to the innovation, development and production of polyester resins for powder coatings. Environmentally friendly polyester-based anti-corrosion powder coatings are a new product developed by
    DSM
    that is consistent with the company's sustainable strategy. Coatings are the main means of protecting steel corrosion and are commonly used in metals. Depending on the environment in which the product is used, steel needs to be corrosion-resistant.
    Uralac® Corres
    。 Uralac ® Corres
    specially developed for steel corrosion protection and can be used in many market segments. The main objectives are thin flat steel (e.g. metal furniture, scaffolding, heating
    /
    ventilation and household appliances), equipment, automotive components and even heavy steel (e.g.
    AEC
    and beam construction). Depending on life expectancy and their different conditions of use,
    have
    their own special requirements.
    industry requirements
    to implement the special requirements of many branches or industries in the standard regulations. For example, corrosion protection standards for steel structures in anti-corrosion coating systems (
    DINEN ISO 12944
    ) are specified in the corresponding atmospheric environment. Others implement the
    of DIN EN ISO 12944
    standards. Classify atmospheric corrosive environments in
    DIN 12944
    , from mild
    C1
    to highly corrosive
    C4
    , as well as the special levels of high-corrosion industrial
    C5I
    and marine
    C5M
    environments. Figure
    1
    shows the minimum requirements for
    2
    of the most important tests (neutral salt spray and moisture) related to corrosion grades and expected service life.
    in accordance with the above requirements,
    DSM
    powder coating resins have developed a new technology for corrosion protection:
    Uralac® Corres
    , with a focus on reducing the environmental impact of the entire coating process. In a single coating system,
    Ualac®Corres
    protects the metal directly to a corrosion level of
    C4
    grade.
    are important for more difficult corrosive
    C4
    to
    C5
    ,
    Ualac® Corres
    can be used as a primer combined with finish. Due to good inter-layer adhesion, baking resistance and more significant UV resistance, the additional important benefit of using
    Uralac® Corres
    -based primers is to reduce the risk of layering.
    new technology has an enhanced shielding effect, blocking the elements of the corrosion process: water and oxygen, through the coating. The hydrophobicity of the substits increases, and the strong interaction between the substits and the pigments is synergistic. In addition, the barriers caused by
    corres ® coatings
    attached to metal substrates inhibit the corrosion process.
    Direct Comparative Research
    in order to support and support the above statement,
    DSM
    has directly compared the product to a common powder coating system. Using
    Ualac® P7604 Corres
    for
    R 46Q-panels
    , according to the
    ISO 9227
    with pure epoxy,
    70/30
    hybrid and
    95/Primid
    system reference standards,
    was
    after a
    480 h neutral salt spray test. Figure


    2
    clearly shows the good performance of the
    Uralac® P 7604
    Corres
    compared to
    3.
    in addition to passing the requirements of the industry,
    The DSM
    also uses analytical instruments to analyze its enhanced shielding performance and verify the theory.
    Resistance Monitoring
    To support the test results of salt spray, the
    TNO
    in Denheilde, the Netherlands, uses the electrochemical AC impedance spectrum (
    EIS
    ) to combat corrosion. Electrochemical AC impedance spectrum technology can determine the corrosion resistance of coatings. This is obtained by measuring the resistance of AC in electrochemical battery systems. The greater the resistance of the coating, the better the corrosion resistance.
    3
    3
    shows that
    Uralac®Corres
    's corrosion resistance before and after the neutral salt spray test is still good, better than the sample. Compared
    data from
    TNO, the high resistance value supports the theory that
    Uralac®Corres
    polyester resins have good shielding to prevent corrosion. Due to its excellent corrosion resistance in metal coatings,
    Uralac® Corres
    technology offers the possibility of reducing chemical pre-treatment steps or sometimes without chemical pre-treatment at all.
    Figure
    4
    shows a reduction in process steps by comparing the simple cleaning process of
    Uralac® Corres
    with a
    9
    -step iron phosphate pre-treatment process.
    addition to good performance,
    Uralac ® Corres
    saving production space and reducing investment, especially for new production lines.
    environmental impact
    because
    Uralac® Corres
    significantly reduces or eliminates pre-treatment steps although it eliminates the use of chemicals that are harmful to the environment.
    Ualac®Corres
    meets all requirements of the
    480 h
    Neutral Salt Spray Test (
    NSS
    ) and does not require any pre-treatment. This is a product
    100%
    avoid the use of hazardous phosphate chemicals and is completely free of risks related to the treatment and disposal of phosphoric acid chemicals. Make the working environment better.

    DSMUralac®Corres
    opens up a new option for anti-corrosion coatings due to its high corrosion resistance, elimination of pre-treatment steps and the ability to replace epoxy primers in coating processes.
    DSM
    powder coating resins will continue to be at the forefront of innovation and contribute to the development of the coatings industry.
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