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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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