Kinte Materials Science and Technology Co.,Ltd
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Isocyanate Polyester Resin with Good Flowability and Smudge Resistance
◇ Applications:
NH7807 is a hydroxylated polyester resin for polyester/isocyanate powder coating system.
Advantages of powder coatings
1. Health and environmental protection
All kinds of liquid chemical harmful film-forming, dispersion, wetting, leveling, anti-corrosion and anti mildew additives added to achieve coating performance are omitted.
2. Convenient transportation and storage
Ordinary coatings contain about 20-50% water or solvent, while powder coatings are completely solid without water or solvent, which is convenient and safe for transportation. In addition, coatings containing water or solvent tend to freeze when the transportation and storage temperature is lower than 0 ℃. This problem does not exist in powder coatings.
3. No preservative is required
In the traditional liquid coating, there is both water and bacterial food, which is easy to be polluted by bacteria. Therefore, in order to prevent deterioration, preservatives should be added, while latex powder coatings have no bacterial pollution and do not need preservatives
4. Paint smell
Compared with the general traditional coating smell residue, this coating can disperse quickly, which can be said to disappear immediately.
◇ Basic features:
Excellent leveling
Excellent mechanical properties
High weathering resistance
Good smudge resistance
◇ Specifications:
Appearance White or pale yellow transparent flake
Color (50%DMF): max: 2
Hydroxyl Value(mg KOH/g): 27～33
Softening point(℃): 105～115
Glass transition temp.(℃): ～62
Melting viscosity(200℃, cone/plate, mPa·s): 10000±500
Reactivity at 180℃(s, 16.7% B1530): 350±50
◇ Recommend Formulation:
| NH7805 | Hardener | Filler ＆ pigment | Leveling agent | Benzoin |
| 523 | 130 | 334 | 10 | 3 |
◇ 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): 500~600
Horizontal flow:(180℃), mm: 27~31
Gloss(60°): ≥90%
Bending(φ1mm): Pass
Adhesive(1mm,grade): 0
Pencil hardness ≥1H
Impact (50cm): pass
◇ 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)
