Desmotherm 2170
Desmotherm 2170
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.
