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Desmodur® N 75 MPA/X is an aliphatic polyisocyanate (HDI biuret) supplied as a 75% solution in a 1:1 mixture of 1-methoxypropyl acetate and xylene. It serves as a hardener component for lightfast two-component polyurethane coatings, offering high resistance to chemicals and weathering, excellent gloss retention, and outstanding mechanical properties.
Description
Desmodur N 75 MPA/X is an aliphatic polyisocyanate (HDI biuret) used as the hardener component for lightfast polyurethane coating systems. It is used primarily as the hardener component for lightfast two-component polyurethane coatings with high resistance to chemicals and weathering, very good gloss retention, and outstanding mechanical properties. Preferred co-reactants are polyacrylate or polyester polyols. The main applications for systems based on Desmodur N 75 MPA/X are air- and force-drying coatings for automotive and industrial finishing, for wood, furniture, and plastics, and for corrosion protection. It is supplied at approximately 75% in 1-methoxypropylacetate-2/xylene (1:1). See also Desmodur ultra N3300, a related aliphatic HDI-trimer hardener that the manufacturer specifically names as compatible for combination with this product.
| Property | Value | Unit of measurement | Method |
| NCO content | 16.5 ± 0.3 | % | M105-ISO 11909 |
| Non-volatile content2.2 g / 120 min / 100 °C | 75 ± 1 | % | M020-ISO 3251 |
| Viscosity (23 °C) | 250 ± 75 | mPa·s | M014-ISO 3219/A.3 |
| Color value (Iod) | ≤ 40 | M017-EN 1557 | |
| Monomeric content | < 0.38 | % | M106-ISO 10283 |
Solubility / thinnability
Desmodur® N 75 MPA/X 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). Aliphatic hydrocarbons are unsuitable as solvents. Desmodur® N 75 MPA/X 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.
Application
Desmodur® N 75 MPA/X is used primarily as the hardener component for lightfast two-component polyurethane coatings with high resistance to chemicals and weathering, very good gloss retention and outstanding mechanical properties. Preferred co-reactants are polyacrylate or polyester polyols. The main applications for systems based on Desmodur® N 75 MPA/X are as air- and force-drying coatings for automotive and industrial finishing, for wood, furniture and plastics and for corrosion protection.
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