80/20 Saturated Polyester Resins Excellent Leveling Polyester Isocyanate Resin
80/20 Isocyanate Polyester Resin, Excellent Leveling Saturated Polyester Resins
◎Introduction
NH7805 is a hydroxylated polyester resin for polyester/isocyanate powder coating system, suitable for polyurethane powder coatings.
Polyurethane powder coatings are developing into the mainstream of powder coatings, accounting for an increasing proportion of powder coatings. Because polyurethane powder coatings have excellent weather resistance, excellent physical and mechanical properties and corrosion resistance, the coating film is bright and plump, resistant to Abrasion, scratch resistance, solvent resistance, good leveling and strong adhesion. It is widely used in refrigerators, washing machines, air conditioners and other household appliances, as well as high-end furniture, automobiles, motorcycles and other industries.
◎Basic Features
Excellent leveling
Good chemical resistance and mechanical properties
High weathering resistance
Suitable for polyurethane powder coatings
◎Recommend Formulation:
| NH7805 | Hardener | Filler ＆ pigment | Leveling agent | Benzoin |
| 523 | 130 | 334 | 10 | 3 |
◎Specifications I
| Appearance | White or pale yellow transparent flake |
| Color (50% DMF) | max:2 |
| Hydroxyl Value (mgKOH/g) | 35～55 |
| Softening Point (℃) | 102～112 |
| Glass Transition Temp. (℃) | ～61 |
| Melting Viscosity (200℃, cone/plate, mPa·s) | 3500～6500 |
| Reactivity at 180℃ (s, 20% B1530) | 240～400 |
| Curing Requirement | 200℃×20 min |
| Packaging | PE Bags, Net Weight 25kg ± 0.1kg / bag |
◎Specifications II
| 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 |
| Coating Film Thickness | 50～70μm | |
| Degreased Cold-rolled Steel | 0.5mm | |
| Film Properties | Gel Time (180℃, sec) | 660~930 |
| Horizontal Flow (180℃, mm) | 29~33 | |
| Gloss (60°) | ≥85% | |
| Bending (φ1mm) | Pass | |
| Adhesive (1mm, grade) | 0 | |
| Pencil Hardness | ≥1H | |
| Impact (50cm) | pass | |
◎More Code
| Code | Ratio | Cure Cycle | Acid Value (mgKOH/g) | Viscosity (mPa.s/200℃) | Tg (℃) | Reactivity (s/180℃) | Properties |
| NH7401 | 40/60 | 200℃×15 min | 280~320 | 7000~11000 | ~55 | 130-250 | High hydroxyl value resin. For one shot matt PU formulations with NH7805. |
| NH7405 | 40/60 | 200℃×15 min | 280~320 | 3000~5000 | ~55 | 120-240 | High hydroxyl value super durable resin. For one shot matt PU formulations wit NH7803. |
| NH7603 | 65/35 | 200℃×15 min | 90~120 | 3000~6000 | ~59 | 110-210 | Excellent flow and good solvent resistance. |
| NH7803 | 80/20 | 200℃×15 min | 35~45 | 3000~5000 | ~57 | 300-420 | Low hydroxyl value super durable resin. For one shot matt PU formulation with NH7405. |
| NH7805 | 80/20 | 200℃×20 min | 35~45 | 3500~6500 | ~61 | 240-400 | Excellent flow, good mechanical properties, good outdoor durability. |
| NH7807 | 84/16 | 200℃×15 min | 27~33 | 9500~10500 | ~62 | 300-400 | Good flow and stain resistance. |
| NH7808 | 84/16 | 200℃×15 min | 25~35 | 7500~10500 | ~59 | 460-660 | Excellent flow, good mechanical properties and outdoor durability. |
| NH7809 | 84/16 | 200℃×15 min | 25~35 | 9000~13000 | ~66 | 420-620 | Outstanding mechanical properties, excellent outdoor durability. For architectural profile and home appliance filed. |
| NH7908 | 88/12 | 200℃×15 min | 20~25 | 9000~12000 | ~57 | 350-580 | For low hardener demand formulation. Good flow and mechanical properties. |
◎Remarks: All the polyester resins could be customized to Non-tin (A), anti gas burners (G), tribo gun (T) and anti-blooming (F).
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