Desmodur N 3600 wannate HT-600 TPA-100 HDMI Hardener

Desmodur N 3600 wannate HT-600 TPA-100 HDMI Hardener

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 . Although present at very low levels, the diisocyanate monomer can pose health risks if the polyurethane paint is handled improperly. It is important to note that the risks associated with the diisocyanate monomer should be balanced with risks in using alternative curing agents, and with the application of any solvent-borne coating. The user must always follow their respective State Spray Painting Regulations (Qld, NSW, ACT, Vic, Tas, SA, WA & NT) and wear a well-fitting, positive-pressure, air-fed full-face respirator and overalls, safety shoes and solvent-resistant gloves in order to spray isocyanate containing products safely.

1.Characterization

Aliphatic polyisocyanate (HDI trimer).

As the hardener component for lightfast polyurethane coating systems.

2.Specification

3.Solubility

Desmodur® N 3600 can be thinned with esters, ketones and aromatic hydrocarbons such as ethyl acetate, butyl acetate, propylacetate, , 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.

4.Thinnability

Desmodur® N 3600 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.

5.Compatibility

Generally speaking, Desmodur® N 3600 can be mixed with the following products: Aliphatic polyisocyanates like Desmodur® N 100, N 75, N 3200, ultra N 3300, N 3400 and Desmodur® Z 4470; aromatic polyisocyanates like Desmodur® L/ultra L, HL and IL/ultra IL; polyester polyols such as Desmophen® 670 and polyacrylates. However, the compatibility of the combinations used should be tested.

Desmodur® N 3600 is not compatible with branched polyester polyols such as Desmophen® 651 or poly polyols such as Desmophen® 1380 BT.

6.Properties

Desmodur® N 3600 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.

7.Applications

The main applications for systems based on Desmodur® N 3600 are air- and force-drying coatings for automotive OEM, automotive refinishing, transportation, industrial finishing and plastics.

On account of its low viscosity, Desmodur® N 3600 is particularly suitable for the formulation of high-solids coatings and can also be used as the hardener for aqueous two-component polyurethane coatings.

8.Storage

- 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.