HAA Polyester Resin with Excellent Mechanical Properties for Primid Powder Coating
◎Introduction
KK7701 is a saturated carboxyl polyester resin designed for Primid T-105 powder coating to be cured at 180℃.
Powder coatings are solid powder synthetic resin coatings composed of solid resins, pigments, fillers, and additives. Different from common solvent-based coatings and water-based coatings, its dispersion medium is not solvent and water, but air. It has the characteristics of no solvent pollution, 100% film formation, and low energy consumption. However, compared with liquid coatings, powder coatings are easy to form pinholes, which affect the performance of the coating film, which is a problem that powder coatings must overcome. Many powder coating users will use benzoin for degassing, but while benzoin eliminates pinholes, it is also easy to cause yellowing of the coating film, and the problem is more prominent in the HAA system. We can use benzoin and degassing wax together to achieve the purpose of eliminating pinholes without yellowing the coating film.
◎Basic Features
Excellent mechanical properties
Good anti-yellowing
Pinhole free in thick films
Good weathering resistance and storage stability
◎Recommend Formulation:
KK7701/HAA
| KK7701 |
T-105 |
Filler ＆ pigment |
Leveling agent |
Benzoin |
701 |
703 |
| 200 |
10.5 |
133 |
2.8 |
1.4 |
1.4 |
1.4 |
◎Specifications I:
| Appearance |
white or pale yellow transparent flakes |
|
Color (50% DMF)
|
Max:2
|
| Acid Value (mgKOH/g) |
30～37 |
| Softening Point (℃) |
98～108 |
| Glass Transition Temp. (℃) |
～58 |
| Melting Viscosity (200℃, cone/plate, mPa·s) |
4000±1000
|
| Reactivity at 180℃ (s,5% XL552) |
280±60
|
| Curing Requirement |
180℃×10min
|
| Packaging |
PE Bags, Net Weight 25kg ± 0.1kg / bag |
◎Specifications II:
| Extrusion Condition |
Two-screw Extruder |
|
Jacket temperature
|
100～110℃
|
| 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) |
200~300 |
| Horizontal Flow (180℃, mm) |
25~31 |
| Gloss (60°) |
≥80% |
|
Bending (φ1mm)
|
Pass
|
| Adhesive (1mm, grade) |
0 |
| Pencil Hardness |
≥1H |
| Impact (50cm) |
Pass |
◎Remarks:
All the polyester resins could be customized to Non-tin (A), anti-gas burners (G), tribo gun (T), and anti-blooming (F).
◎Company Profile:
Kinte Materials Science and Technology Co., Ltd. is subordinate to China Machinery Industry Corporation (a key state-owned enterprise directly managed by SASAC, ranking 284 among the world's top 500 in 2021). It is a national high-tech enterprise under China National Electric Apparatus Research Institute Co., Ltd. (Stock Code: 688128), listed on the SSE STAR MARKET. Focusing on the R & D, production, and sales of environmentally friendly coatings (powder coatings, waterborne industrial coatings) and powder coating resins, the company is committed to improving the global market competitiveness of China's environmentally friendly coating industry. Now it has become the leader and promoter in China’s technological development of environmentally friendly coatings as well as polyester resins for powder coatings!
In 2017, the new production base with 80000 tons annual capacity was put into construction in Dongguan, Guangdong, and the annual production capacity reached 120000 tons by the end of 2020, opening the road to global diversified development.
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Anti Yellowing HAA Polyester Resin With Excellent Mechanical Properties For Primid Powder Coating Images
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