96/4 HAA Primid Saturated Polyester Resins with Excellent Flowability
◎Introduction
NH6688K is a saturated carboxyl polyester resin designed for 96.5:3.5 Primid XL 552 powder coating to be cured at 180℃.
Outdoor powder coating systems are divided into two categories: triglycidyl isocyanurate (TGIC) and hydroxyalkylamide (HAA) according to their curing systems. TGIC has a triazine ring epoxy structure, the prepared powder coating film has high hardness, clear and bright board surface, no pinholes in a thick coating, good weather resistance, yellowing resistance, and adjustable curing speed; Sensitivity and potential carcinogenicity, the European Union has clearly stipulated that it should not be used as a curing agent for powder coatings; in addition, due to its good compatibility with polyester, small molecular TGIC will produce relatively small molecules after adding it to polyester. With the strong plasticizing effect, so TGIC will greatly reduce the powder Tg, which in turn affects its storage stability. HAA has a highly active amide hydroxyl structure, which has the advantages of energy saving, non-toxicity, and mechanical properties. In addition, it has poor compatibility with polyester and does not reduce the powder Tg basically, so it does not affect the storage stability of the powder; at the same time, due to the HAA Due to its inherent chemical structure, even in the absence of catalysts, the curing speed is still very fast, and the leveling of the resulting coating cannot be satisfactory.
NH6688K solves the above problems, it has excellent leveling performance and surface fineness.
◎Basic Features
Excellent flowability
Good mechanical properties
Good resistance to chemicals and fine anti-yellowing
◎Specifications:
| Appearance | Pale yellow flake |
Color (50% DMF) | Max:2 |
| Acid Value (mgKOH/g) | 20～25 |
| Softening Point (℃) | 100～110 |
| Glass Transition Temp. (℃) | ～55 |
| Melting Viscosity (200℃, ICI, mPa·s) | 7000±1000 |
| Reactivity at 180℃ (s,3.5% T-105) | 240～360 |
| Curing Requirement | 180℃×10min |
| Packaging | PE Bags, Net Weight 25kg ± 0.1kg / bag |
◎Recommend Formulation:
| NH6688K | T-105 | Filler ＆ Pigment | Leveling | Benzoin | 701 | 703 |
| 579 | 21 | 380 | 8 | 4 | 4 | 4 |
◎Extrusion Condition:
Two-screw Extruder
Zone I: 90～110℃ Zone II: 100～110℃
Speed of Revolution: 500～1200rpm
Fineness of Powder: ＜100μm
◎Application Condition:
Electrostatic spraying with: 40～70KV
Coating film thickness: 50～100 μm
Degreased cold-rolled steel: 0.5mm
◎Film Properties:
| Gel Time (180℃, sec) | 220~330 |
| Horizontal Flow (180℃, mm) | 23~27 |
Gloss (60°) | ≥88% |
Bending (φ1mm) | Pass |
| Adhesive (1mm, grade) | 0 |
| Pencil Hardness | ≥1H |
| Impact (50cm) | Pass |
Storage test (40℃, 24hr) | Good |
◎Remarks:
All the polyester resins could be customized to Non-tin (A), anti gas burners (G), tribo gun (T) and anti-blooming (F).
◎More Codes:
| Code | Ratio | Cure Cycle | AV (mgKOH/g) | Viscosity (mPa.s/200℃) | Tg (℃) | Reactivity (s/180℃) | Properties |
| NH6686 | 96/4 | 180℃*10min | 24~29 | 4000~5500 | ~59 | 200-350 | Suitable for general industrial products. Low hardener demand, good flow and pinhole free in thick films. |
| NH6688K | 96/4 | 180℃*15min | 20~25 | 6000~8000 | ~55 | 240-360 | Excellent flowability, Good mechanical properties, good resistance to chemicals and fine anti-yellowing, could be cured at 180℃. |
◎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), a listed enterprise 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!
We have gained ISO9001 and ISO14000, ISO18001, RoHS, UL certification and QUALICOAT Certificate. Due to the excellent and stable quality, our products always enjoy high reputation at home and oversea, and were sold to more than 30 countries.
Polyester resin branch was founded in 2000, now there are two factories (DongGuan factory and TaiXing Factory) with annual production capacity over 80,000 tons, and the annual production capacity reached 120000 tons by the end of 2020, opening the road to global diversified development. Our clients include many top-tier powder manufacturers in the world such as AKZO, PPG, TIGER, PROTECH, NIPPON, OXYPLAST, JOTUN, SHERWIN, VALSPAR, SINTERPLAST, etc.
We unremittingly stick at the business principle of “Quality is the life, adhere to first-class technology, first-class quality, first-class cost and first-class brand”. We would like to provide a complete set of services and solutions for both domestic and abroad customers and would like to go forward to brilliant future with you together.
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