Properties:

Basic requirements for curing agents for melamine resins are fully met by390.

      1.   Shorting or pressing time (down to 20 sec. At 170°C).

2.   Accelerated condensation in drying oven.

3.   No sagging of resin

4.   Long pot-life of resins containing curing agents (up to 24 h).

Despite fast reaction in the drying oven390 shows little tendency to blistering in films and does not disturb the flow of the resin in the press during the coating process. The resin remains on the surface of the coated paper producing a smooth surface of the pressed material.

Mode of action:

390 is a latent curing agent altering the pH of resin only slightly. The pot-life of resin containing curing agent is so ample that it can still be processed even after several hours provided the resin solution is maintained at room temperature.

Application:

390 can be used in all melamine resins which are used for coating of support material such as chipboards, fibreboards and laminated plastic sheets.

Processing:

390 should be well mixed with the finished resin cooled to processing temperature. It is recommended to add curing agent to resins shortly before a new bath is required for impregnating as after addition of 390 pot-life of resin can not be extended arbitrarily.

Usually the resin solution is adjusted to a turgidity time (*) of  3-5 minutes at 100°C by adding of curing agent 390 the required quantity is approx. 0,5% (relative to liquid resin).

(*) Determination of the turgidity time:

Give 5 ml of the resin solution with a pipette into a dry Eprouvette (app. 150 X 15 mm diameter). Dip the Eprouvette into a boiling water-bath. Keep the temperature at 100°C.

The time from dipping the sample into the water-bath until the sample becomes milky is measured. This time is called turgidity time (TW 100).

Product technical information and data is based on best information available and does not constitute or imply a warranty or patent infringement of any kind. User is responsible for testing product suitability prior to full operation use.