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关闭型固化剂Desmodur BL 3575/1 MPA/SN

Desmodur BL 3575/1 MPA/SN

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  • Desmodur BL 3575 MPA/SN


    Type                       Blocked aliphatic polyisocyanate based on HDI
    Form supplied              approx. 75 % in solvent naphtha® 100 / 1

                               -methoxypropylacetate-2 (17 : 8)
    Uses                       In combination with Desmophen® grades to formulate

                               lightfast one-component
                               polyurethane stoving coatings.
    Specification


    Property                   Value          Unit of measurement      Method
    Non-volatile content       75 ± 2                %           DIN EN ISO 3251

    (0.2 g / 1 h / 80 °C)

    Viscosity at 23 °C        3,600 ± 1,000      mPa·s        DIN EN ISO 3219/A.3
    Hazen color value          ≤ 100                            DIN EN 1557


    Other data*
    Property                   Value           Unit of measurement       Method
    Equivalent weight         approx. 400
    Blocked NCO content       approx. 10.5 %
    Density at 20 °C         approx. 1.1 g/ml DIN EN ISO 2811
    Flash point               approx. 53 °C DIN EN ISO 13 736


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

  • Desmodur BL 3575 MPA/SN


    Solubility / thinnability     Desmodur® BL 3575 MPA/SN can be thinned with esters

                                  ketonesand aromatic hydrocarbons such as: ethyl

                                  acetate, butyl acetate,methoxypropylacetate, acetone

                                  methyl isobutyl ketone, toluene, xylene,solvent

                                  naphtha 100, 150 and mixtures thereof.
                                  Generally speaking, it has good compatibility with

                                  the solvents listed. However,the solutions formed

                                  must be tested for their storage stability.

                                  Aliphatic hydrocarbons are unsuitable as solvents.
                                  Desmodur® BL 3575 MPA/SN should not be thinned below

                                  a solids content of 40 %, with solvent naphtha to not

                                  less than 60 %. Prolonged storage of a solution with

                                  a lower binder content may result in turbidity and

                                  sedimentation.


    Compatibility                 Given equivalent crosslinking,

                                  Desmodur® BL 3575 MPA/SN is generally compatible with

                                  Desmophen® 651, 670, 680, 690, 800, 1300, VP LS 2971,
                                  VP LS 2388, VP LS 2107, RD 181, A 160, A 165, A 265,

                                  A 365, A 450, A 565,A 575, A 665 and A 870 and with

                                  Desmophen® T 1665.The combinations should always be

                                  tested for their compatibility.



    Properties / Applications     Desmodur® BL 3575 MPA/SN is combined with Desmophen

                                  types to formulate light-fast, weather-stable,

                                  chemical- and highly heat-resistant,one-component

                                  polyurethane stoving coatings.
                                  The main applications are in topcoats for automotive

                                  OEM and in high-grade industrial finishes

                                  (can-/coil-coatings, etc.).
                                  Compared with Desmodur® BL 3175 SN,

                                  Desmodur® BL 3575 MPA/SN allows a reduction in the

                                  stoving temperature of approx. 10 °C, without any

                                  decrease in solvent and chemical resistance.
                                  Typical stoving conditions without catalyst are,

                                  e.g. for combinations with
                                  Desmophen® T 1665:
                                                    160 °C 20 min
                                                    or 170 °C 10 min
                                                    or 190 °C 5 min
                                 The use of a metal catalyst can significantly reduce

                                 the stoving temperatures.
                                 Used in the coil coating systems, Desmodur® BL 3575

                                 MPA/SN achieves sufficient crosslinking without the

                                 addition of a catalyst from a peak metal temperature

                                 of approx. 232 °C and above



    Storage                      - Storage in original sealed Bayer MaterialScience

                                 container.
                                 - Recommended storage temperature: 0 - 30 °C.
                                 - Protect from moisture, heat and foreign material.
                                 General information: Storage at higher temperatures

                                 will result in increase of color and viscosity.

                                 Storage at significant lower temperatures will result
                                 in solidification. This solidification is reversible

                                 by briefly heating the product without adversely

                                 affecting the quality of the product.


    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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