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Desmodur N 3300 wannate HT-100 TKA-100 HDMI Hardener
A hardener is a component of certain types of mixtures. ... In other mixtures a hardener is used as a curing component. A hardener can be either a reactant or a catalyst in the chemical reaction that occurs during the mixing process. A hardener may also be known as an accelerator.
A polyurethane resin is the result of the chemical reaction between a polyol resin (also known as “Part A”) and a hardener or curing agent (also known as “Part B”). The chemically reactive material in the hardener is called the polyisocyanate curing agent, which becomes an integral part of the polyurethane polymer when mixed with the polyol resin. The polyisocyanate curing agents commonly used in two pack coatings are made from various diisocyanate monomers. In the poly-isocyanate polymerisation process, less than 0.5% remains as diisocyanate monomer. When made up into typical two-pack polyurethane coatings, this diisocyanate monomer generally represents less than 0.2% of the total formulai .
Aliphatic polyisocyanate (HDI trimer).
As the hardener component for lightfast polyurethane coating systems.
|Property||Value||Unit of measurement||Method|
|NCO content||21.8 ± 0.3||%||DIN EN ISO 11 909|
|Viscosity at 23 °C||3,000 ± 750||mPa·s||DIN EN ISO 3219/A.3|
|Color value (Hazen)||≤ 40||DIN EN 1557|
|Monomeric HDI||< 0.15||%||DIN EN ISO 10 283|
|Viscosity at 25 °C||approx. 2,500||mPa·s||DIN EN ISO 3219/A.3|
|Equivalent weight||approx. 193|
|Flash point||approx. 228||°C||DIN 22 719|
|Density at 20 °C||approx. 1.16||g/ml||DIN EN ISO 2811|
3.Solubility / thinnability
Desmodur® N 3300 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 3300 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.
Generally speaking, Desmodur® N 3300 can be mixed with the following products: aliphatic polyisocyanates such as Desmodur® N 100, N 75, N 3200, N 3400, N 3600 and Desmodur® Z 4470; aromatic polyisocyanates such as Desmodur® L, HL and IL; polyester polyols such as Desmophen® 670;
polyacrylates such as the Desmophen® A products. However, the compatibility of the combinations used should always be tested.
Desmodur® N 3300 is not compatible with branched polyester polyols such as Desmophen® 651 or polyether polyols such as Desmophen® 1380 BT.
5.Properties / Applications
Desmodur® N 3300 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 3300 are air- and force-drying coatings for automotive OEM, automotive refinishing, transportation, industrial finishing and plastics.
- Storage in original sealed Covestro container.
- Recommended storage temperature: 10 - 30 °C.
- Protect from moisture, heat and foreign material.
General information: The product is sensitive to moisture and should therefore be stored in tightly sealed containers. Storage at elevated temperatures will lead to an increase in viscosity and a reduction of the NCO content.