Powder coating resins for HAA cure low gloss matt dry blend  Polyester Resin NH6381/NH6688

Applications:

NH6381/NH6688 are saturated carboxyl polyester resins for low gloss polyester/primid powder coatings by dry blending procedure.

The coating is prepared by mixing resin, pigment and filler, curing agent and other additives in a certain proportion, and then by hot extrusion, crushing and screening. They are stored stably at room temperature. After electrostatic spraying or fluidized bed dip coating, they are heated, baked, melted and solidified to form a flat and bright permanent film, so as to achieve the purpose of decoration and anti-corrosion.

Basic features:

Low gloss film

Excellent mechanical properties

Good leveling, good storage stability

Good chemical resistance, fine anti-yellowing

Specifications:

NH6381 NH6688

Appearance pale yellow flakes pale yellow flakes

Color(50%DMF): ≤3 ≤3

Acid number (mgKOH/g): 47～54 19～24

Softening point(℃): 98～118 100～110

Glass transition temp.( ℃): ~56 ~58

Melting viscosity: 2800±1000 5600±800

(200℃, cone/plate, mPa·s)

Reactivity at 180℃(s, XL-552): 90±30 250±30

 Recommend Formulation:

Extrusion Condition:

Two-screw extruder

Zone I: 90～110℃ Zone II: 110～120℃

Speed of revolution: 500～1200rpm

Fineness of powder: ＜100μm

Blending Extrudate I and II with weight ratio 1:1 before grinding.

Application Condition:

Electrostatic spraying with: 40～70KV

Coating film thickness: 50～80μm

Degreased cold-rolled steel 0.5mm

 Curing Requirement: 180℃×15min

Film Properties:

Gloss(60°): ≤40%

Bending(φ2mm): pass

Adhesive(1mm,grade): 0

Pencil hardness: ≥ 1H

Direct Impact Resistance: pass 50kg·cm

 Packaging:

PE bags, N.W. 25KG±0.1KG / bag