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    Blocked Isocyanates

    DESCRIPTION

    Leeson Polyurethanes Ltd. produce a range of blocked isocyanate systems. The range aims to overcome some of the limitations with traditional PU technology, namely:

    TRADITIONAL LIMITATIONS OF PU TECHNOLOGY

    • Stability in 1K systems
    • Pot life restrictions in 2K systems
    • Sensitivity to moisture, both ambient and trace levels in raw materials
    • Increasing concern regarding free isocyanate levels in systems

    BENEFITS OF LEESON’S BLOCKED ISOCYANATE RANGE

    • A range of blocking agents available to give different unblocking temperatures
    • Aliphatic based technology, giving excellent UV colour stability
    • Flexible Formulation approach, offering tailored solutions to customers
    • Products compatible with polyester, urethane and acrylic resins
    • Range of DMP based technology offers lower unblocking temperatures
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    Contact us for more information

    PRODUCT SPECIFICATIONS

    Product: Leeson Blocked Isocyanates – 1 Component

    TYPICAL APPLICATIONS

    OEM – coil coating; automotive coatings; electrostatic coatings; white goods.

    PRODUCTS INCLUDED IN THIS SYSTEM

    Range of products depending on the customers’ requirements

    Detailed guidance available on request.

    IMPORTANT NOTE

    Leeson Polyurethane’s products are guaranteed against defective materials and manufacture and are sold subject to its standard Terms and Conditions of Sale, copies of which can be obtained on request.

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    Download Datasheet
    Contact us for more information

     PRODUCT RANGE OVERVIEW

    PROPERTY
    PU5207
    PU5208
    PU5209
    PU5210
    PU5211
    PU5364
    PU5429
    PU5614
    PU5615
    PU5616
    Appearance
    Clear straw liquid
    Clear straw liquid
    Clear straw liquid
    Clear straw liquid
    Clear straw liquid
    Clear straw liquid
    Clear straw liquid
    Clear low viscosity liquid
    Clear low viscosity liquid
    Clear low viscosity liquid
    Viscosity at 25˚C (mPa.s)
    ≤1000
    900 – 1300
    2050 – 2450
    3200 – 3800
    1300 – 1500
    1000 – 1400
    1000 ± 500
    <1000
    <200
    <1000
    Density at 25˚C (g/cm³)
    1.0 – 1.1
    1.0 – 1.1
    1.0 – 1.1
    1.0 – 1.1
    1.0 – 1.1
    1.0 – 1.1
    1.0 – 1.1
    1.0 – 1.1
    1.0 – 1.1
    1.0 – 1.1
    Solids content (%)
    68 – 72
    68 – 72
    68 – 72
    63 – 73
    68 – 72
    63 – 67
    68 – 72
    38 – 42
    38 – 42
    38 – 42
    Isocyanate type
    HMDI Trimer
    HDI Biuret
    HDI Biuret
    IPDI Trimer
    HMDI Trimer
    IPDI Monomer
    HDI Biuret
    HMDI Trimer
    HMDI Trimer
    HMDI Trimer
     

    Solvent
    1-Methoxy-2-
    Propanol
    1-Methoxy-2-
    Propanol
    Naphtha B
    Naphtha B
    Butyl acetate
    1-Methoxy-2-
    Propanol
    1-Methoxy-2-
    Propanol
    1-Methoxy-2-
    Propanol
    Water
    Water
    Water
    Flashpoint
    – closed cup (˚C)
    31
    31
    48
    22
    31
    31
    31
    N/A
    N/A
    N/A
    Boiling point (˚C)
    120
    120
    135
    126
    120
    120
    120
    N/A
    N/A
    N/A
    Apparent % NCO
    (as supplied)
    10.12
    10.2
    10.2
    7.9
    10.5
    7.46
    8.94
    4.0
    5.1
    4.8
    Apparent eq. wt.
    (as supplied)
    415
    410
    410
    530
    400
    563
    470
    1056
    826
    875
    Blocking agent
    3,5-dimethylpryazole
    3,5-dimethylpryazole
    3,5-dimethylpryazole
    3,5-dimethylpryazole
    Methyl ethyl Ketoxime
    3,5-dimethylpryazole
    Diethyl malonate
    Dimethyl-pyrazole
    Dimethyl-pyrazole
    Dimethyl-pyrazole
    Application
    Automotive
    & Coil Coating
    Coil
    Coil & Electrostatic
    Automotive
    & Coil Coating
    Automotive
    & Coil Coating
    Automotive
    & Coil Coating
    Automotive
    & Coil Coating

    FURTHER INFORMATION

    The Leeson Polyurethane range includes 4 blocking agents, allowing customers to choose the temperature (and also the isocyanates), they wish to use. Detailed below are the 4 blocking agents used within our range.

     

    Blocking Agent
    Unblocking Range (°C)
     Diethyl malonate (DEM)100-120
    Dimethyl pyrazole (DMP)110-120
    Methylethyl ketoxime (MEKO)140-160
    ε-Caprolactam (ε-CAP)160-180

     

    HOW DOES THE TECHNOLOGY WORK?

    During manufacture, we react the blocking agent onto the isocyanate.  This gives an inert and non hazardous material, at standard ambient temperatures.

    The blocked isocyanate can be compounded into suitable coating systems, which are applied and dried.  Once cured at the correct unblocking temperature, the isocyanate is able to react with the functional co-binder polymer, to give a final cross linking cure.

    FOR MORE INFORMATION

    To ensure you are specifying a fit for purpose system for your application please consult our Area Sales Manager for your area or visit our website.