HAA Polyester Resin NH6381&NH6688 for 30% Low Gloss Powder Coating

◇ Applications:

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

◇ 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.( Tg,℃):                 ~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

Remarks:all the polyester resins could be customizes to Non-tin (A) ,anti gas burners(G),tribo gun(T) and anti-blooming(F)