Covestro Desmodur® N75 MPA/X HDI biuret curing agent Good chemical resistance and flexibility
|
type |
Aliphatic polyisocyanate (hexamethylene diisocyanate biuret) |
|
form of supply |
About 75% 1-methoxypropyl acetate-2/xylene (1:1) solution |
|
use |
Used as a curing agent component in lightfast polyurethane coatings |
Specification
|
characteristic |
Numerical value |
Units of measurement |
method |
|
NCO content |
16.5±0.3 |
% |
DINENISO11909 |
|
Non-volatile content (2.2g/120min/100°C) |
75±1 |
% |
DINENISO3251 |
|
Viscosity, 23°C |
250±75 |
mPa·s |
DINENISO3219/A.3 |
|
Color value (Hazen) |
≤40 |
|
DINEN1557 |
|
HDI monomer |
<0.5 |
% |
DIN55956 |
Other data*
|
characteristic |
Numerical value |
Units of measurement |
method |
|
Viscosity, 25°C |
about 225 |
mPa·s |
DINENISO3219/A.3 |
|
equivalent |
about 255 |
|
|
|
Flash point |
about 38 |
°C |
DIN53213/1 |
|
Density, 20°C |
about 1.07 |
g/ml |
DINENISO2811 |
*This data is general information and is not part of the product specification.
Solubility/Dilution
Desmodur® N75 MPA/X can be used with esters, ketones, aromatic hydrocarbon solvents such as: ethyl acetate, butyl acetate, methoxypropyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, Xylene, No. 100 solvent naphtha and mixtures thereof are diluted. Generally have good miscibility with these solvents. However, the storage stability of the resulting solutions must be tested. Polyurethane grade solvents should be used (less than 0.05% water, no reactive groups such as hydroxyl or amino groups). Aliphatic hydrocarbons are not suitable solvents. Desmodur® N75 MPA/X should not be diluted below 40% solids. Solutions with low binder content may experience turbidity and precipitation after prolonged storage.
compatibility
Desmodur® N75 MPA/X can generally be used with the following products. Namely: Desmodur® N3200, N3300, N3400, N3600 and Desmodur® Z4470 aliphatic polyisocyanates; Desmodur® L, HL and IL aromatic polyisocyanates; Desmophen® 651 and 670 polyester polyols; Desmophen® A polyisocyanates Acrylate; Desmophen® 1380BT based polyether polyol. However, the compatibility of the prepared solution must be tested.
Features/Applications
Desmodur® N75 MPA/X is mainly used as the curing agent component of lightfast two-component polyurethane coatings with good chemical resistance, weather resistance, excellent gloss retention and excellent mechanical properties. Desirable co-reactants are polyacrylates or polyester polyols. Coating systems formulated with Desmodur® N75 MPA/X are self-drying and drying for automotive paints and industrial finishes such as wood, furniture, plastic finishing and corrosion protection.
store
Desmodur® N75 is moisture sensitive and should be stored in its original sealed container. When properly stored at room temperature, this product has a shelf life of at least 6 months.
Safety: Hazard Identification
Flammable. Harmful by inhalation or in contact with skin. Skin contact can cause allergic reactions. Contains isocyanates. There is a risk of inhalation of xylene and ethylbenzene through the skin. The safety data sheet must be strictly followed for operation. It includes information on labelling, transportation and storage, as well as information on product use, product safety and ecology.
