Ultraviolet Absorber

T531 ultraviolet absorber can obviously prevent the coating film from chalking, cracking, foaming and discoloring early or other aging phenomena due to ultraviolet light. It can obviously prolong the weathering quality, largely absorb ultraviolet light and possess better light stability. The thicker the coat is, the better the effect will be. It has no any influence on mechanical property of coating film. Used together with T317 yellow stain resisting agent, the effect will be perfect.

II. Technical indexes
Appearance: white to light yellow crystalline powder
Melting range: 120~130centidegree
Volatile content: More than or equal to99%

III. Basic ingredients of powder coating (outdoor white high light powder) (dose: 0.3~0.5% inner extruding)
Name Weight
Polyester resin (pure) 600
Titanium pigment (rutile) 200
Precipitated barium sulfate 150
TGIC 45
T531 ultraviolet absorber 5
T317 yellow stain resisting agent 5
T88 pure leveling agent 10
T701 luster-enhancing agent 10
T307 yellow stain resistant benzoin 5

IV. Coating manufacturing technology:
Extruder: double screw extruder
Extruder prezone temperature: 115 degree
Extruder postzone temperature: 125 degree
Extruder speed: 30HZ
V. Baking temperature: 180 centidegree/15min or 200 centidegree/10min