Polyester Resin Isocyanate 80/20 for PU wrinkle powder coating

Applications:

NH7805 is a hydroxylated polyester resin for polyester/isocyanate powder coating system

Basic features:

Excellent leveling

Good chemical resistance and mechanical properties

High weathering resistance

Suitable for polyurethane powder coatings

Specifications:

Appearance White or pale yellow transparent flake

Color (50%DMF): max: 2

Hydroxyl Value(mg KOH/g): 35～55

Softening point(℃): 102～112

Glass transition temp.(℃): ～61

Melting viscosity(200℃, cone/plate, mPa·s): 5000±1500

Reactivity at 180℃(s, 20% B1530): 320±80

Recommend Formulation:

Extrusion Condition:

Two-screw extruder

Zone I: 90～110℃ Zone II: 110～120℃

Speed of revolution: 500～1200rpm

Fineness of powder: ＜100μm

Application Condition:

Electrostatic spraying with: 40～70KV

Film thickness: 50～70μm

Degreased cold-rolled steel 0.5mm

Curing Requirement: 200℃×20min

Film Properties:

Gel time(180℃,sec) 660~930

Horizontal flow:(180℃), mm: 29~33

Gloss(60°): ≥85%

Bending(φ1mm): Pass

Adhesive(1mm,grade): 0

Pencil hardness ≥1H

Direct Impact (50cm): pass

Packaging:PE bags, N.W. 25KG±0.1KG / bag