封闭型固化剂Desmodur BL 3575/1 MPA/SN
Desmodur BL 3575/1 MPA/SN
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.
