Products

NH-7401/7803

NH-7401/7803 are saturated carboxyl polyester resins for low gloss polyester/isocyanate powder coatings by one shot extrusion.

Basic features：

-Good film appearance

-Good chanical resistance

-Excellent weathering resistance

-Suitable for matt or low gloss powder coating

Specifications:

	NH-7401	NH-7803
Appearance	pale yellow flake
Color(50%DMF)	<=2	<=2
Hydroxyl Value（mgKOH/g）	280~320	35~45
Softening point(℃)	102~112	102~112
Glass transition temp(℃)	~55	~57
Melting viscosity(200℃,cone/plate,mPa·s)	3000~5000
Reactivity at 180℃(s,B1530)	120~240	300~420

Recommend Formulation:

HH-7401	NH-7803	B1530	TiO2	BaSO4	Leveling agent	Benzoin
137	205	257	205	183	10	3

Extrusion Condition:Two-screw extruder

Zone Ⅰ	90~110℃	ZoneⅡ	110~120℃
Speed of revolution	500~1200rpm	Fineness of powder	<100μm

Application Condition:

Electrostatic spraying with	40~70KV
Coating film thickness	50~80μm
Degreased cold-rolled steel	0.5mm

Curing Requirement:200℃*15min

Film Properties:

Gloss(60°)	<=20%
Pencil hardness	>=3H

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