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Desmotherm 2170

Desmotherm 2170

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  • Desmotherm  2170

    Type                   Aromatic, self-crosslinking, stoving urethane resin
    Form supplied          approx. 70 % in n-butyl acetate / solvent naphtha® 100

                          / isobutanol(13 : 12 : 5)
    Uses                  As a binder for one-component stoving polyurethane systems
    Specification
    Property                  Value       Unit of measurement     Method
    Non-volatile content     69 ± 2            %              DIN EN ISO 3251

    (5.0 g/60 min/125 °C,
    convection oven)
    Viscosity at 23 °C     2000 ± 1200       mPa·s         DIN EN ISO 3219/A.3
    Color value (Iod)       ≤ 7                              DIN EN 1557


    Other data*
    Property                Value        Unit of measurement      Method
    Flash point            approx. 25         °C            DIN 53 213/1
    Density at 20 °C      approx. 1.10       g/ml           DIN EN ISO 2811

    *These values provide general information and are not part of the product specification.

  • Desmotherm  2170


    Solubility / thinnability       Desmotherm® 2170 can be thinned with esters,

                                    ketones and aromatic  hydrocarbons such as ethyl

                                    acetate, butyl acetate, methoxypropylacetate,
                                    acetone, methyl ethyl ketone, methyl isobutyl

                                    ketone, cyclohexanone, toluene, xylene, solvent

                                    naphtha® 100 and mixtures thereof. Generally

                                    speaking, it has good compatibility with the

                                    solvents listed.
                                    However, the solutions formed must be tested for

                                    their storage stability. Only PU grade solvents

                                    should be used (max. 0.05 % water, absence of

                                    reactive groups such as hydroxyl or amino groups)

                                    The product has only limited thinnability with

                                    aliphatic hydrocarbons.
                                    Desmotherm® 2170 should not be thinned to below

                                    a solids content of 40 %. Prolonged storage of

                                    a solution with a lower binder content may result
                                    in turbidity and sedimentation.

    Compatibility                   Generally speaking, Desmotherm® 2170 is compatible

                                    with various polyesters from the Desmophen® and

                                    Alkynol® ranges, amino resins and flexibilisers.
                                    However, the compatibility of the combinations

                                    used should always be tested

    Properties/Applications         Desmotherm® 2170 is used primarily as the binder

                                    in one-component stoving polyurethane systems for

                                    highly flexible primers, intermediate coats,

                                    primer surfacers and thin coil-coating primers.

                                    Being a self-crosslinking stoving urethane resin

                                   the product contains the amount of polyol required

                                   for crosslinking as well as the hardener. The film

                                   properties can be modified by combination with

                                   various polyesters from the Desmophen® and Alkynol
                                   ranges, amino resins and flexibilisers.
                                   The main field of application for systems based on

                                   Desmotherm® 2170 is as primer surfacers in

                                   automotive OEM finishing. When formulating coatings

                                   with Desmotherm® 2170, the temperature should not

                                   exceed  60 °C otherwise the crosslinking reaction

                                   will begin

                                   The properties of films based on Desmotherm® 2170

                                   are largely independent of the stoving conditions.

                                   The following stoving cycles are a guide:
                                   100 °C 50 min
                                   140 °C 15 min
                                   160 °C 7 min
                                   200 °C 4 min
                                   Optimum film properties are obtained after approx.

                                   30 min at 130 °C. Overbaking at around 180 °C is

                                   possible without any significant deterioration in

                                   the film quality.


    Storage                       - Storage in original sealed Bayer MaterialScience

                                    container.
                                  - Recommended storage temperature: 0 - 23 °C.
                                  -Protect from moisture, heat and foreign material.
                                   General information Storage at higher temperatures

                                   will result in increase of color and the viscosity

                                   may increase above the specified maximum level. A
                                   slight increase in viscosity is also possible at

                                   lower temperatures.


    Storage time                  Bayer MaterialScience represents that, for a period

                                  of six months following the day of shipment as stated

                                  in the respective transport documents, the product
                                  will meet the specifications or values set forth in

                                  section "specifications or characteristic data" above

                                  what ever is applicable, provided that the product is
                                  stored in full compliance with the storage conditions

                                  set forth in and referenced under section "storage"

                                  above and is otherwise handled appropriately.
                                  The lapse of the six months period does not

                                  necessarily mean that the product no longer meets

                                  specifications or the set values. However, prior to

                                  using said product, Bayer MaterialScience recommends

                                  to test such a product if it still meets the

                                  specifications or the set values.

                                  Bayer MaterialScience does not make any

                                  representation  regarding the product  after the

                                  lapse of the six months period and Bayer

                                  MaterialScience shall not be responsible or liable

                                  in any way for the product failing to meet

                                  specifications or the set values after the lapse

                                  of the six months period.

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