K7150 Polyisocyanate curing agent for powder coatings

1. Description:

Curing agent or crosslinking is the mechanism in which a functional entity (single molecule or functionality part of an oligomer, pre-polymer or polymer) reacts during the polymerization process with the other elements to be incorporated in the new polymer chains system.There are various crosslinking methods, and curing agents that can improve the polymerization mechanism. Sometimes, curing agents are absolutely required to reach the final coating’s characteristics. Between all the varieties of crosslinking chemistries, learn how to select the best curing agent for your coating formulations.With the R&D and applicant experience in China, we come up with series of Kabasph curing agent or harder for Epoxy resin, polymer resin, hybrid, polyurethane and so on!

K7150 is a closed polyisocyanate curing agent for powder coatings, designed to cure with hydroxy polyester or hydroxy acrylic resin to provide a smooth, weather-resistant and highly cross-linked powder coating.

2. Typical properties:

Appearance                      white to pale yellow granule             [visual]

NCO content (%)                   14- 16                                          [Di-n-butylamine method]

Free NCO(%)                         ≤1.0                                              [Di-n-butylamine method]

Tg  (C)                                    45-55                                           DSC

Herein described to be typical properties and do not constitute specification limits.

3. Characteristics:

• Extremely high crosslink density, excellent surface hardness and chemical resistance for coating.

• Excellent leveling and smoothness.

• Excellent weather resistance and anti yellowing performance.

4. Type specification:

5. Application:

6. Use method & levels

• Equivalent weight of this product is approx 310. It is recommended to cure with hydroxyl polymer in equivalent  amount (15:85 for polyester with hydroxyl value of 30; 22:78 for polyester with hydroxyl value of 50). Tin-based catalysts can significantly improve coating mechanical properties and solvent resistance.

• Unsealing temperature of this product is above 170℃, so it is recommended to fully cure at 180℃*20min or 200℃ * 15min.

7. Package & Storage

• Packaging with PE lined Kraft paper bags. Net weight 25kg per bag.

• Store in temperature under 32℃ and cool dry place to avoid caking. Keep package closed after using. Keep

       away from heat and fire.

• Based on our experience the shelf life of this product under above conditions is at least 2 years.