50/50 Hybrid Polyester Resin for Low Curing Powder Coatings
◎Introduction
HH2535 is a carboxyl terminated saturated polyester resin, which is mainly used in polyester / epoxy powder coating system.
Whether the powder coating is thermoplastic or thermosetting, the film forming temperature is about 180-200℃, and the curing time is 10-20 minutes, which limits that it can only be used for heat resistant substrates such as metals, and is time-consuming and relatively energy consuming. Each reduction of 10℃ curing temperature will save about 10% of energy. In order to save energy and reduce costs, expand the coating range of powder coatings, and better connect with solvent based coating lines, powder coatings must be developed towards low-temperature curing.
The low temperature curing of powder coatings can be achieved by reducing the melting temperature, viscosity, softening point of the resin itself, increasing the functional groups of the resin, increasing the degree of crosslinking, adding appropriate additives, applying appropriate catalysts and other means. Reducing the curing temperature of powder coatings can not only speed up the production of automatic production lines, improve production efficiency, save energy, but also greatly increase the application range of powder coatings.
The key to determine the performance of powder coatings is the matrix resin. HH2535 is the resin developed to achieve low temperature curing of powder coatings.
◎Basic Features
Designed for thermosensitive substrate
Excellent degassing performance
Good board appearance
◎Recommend Formulation:
| HH2535 | 014U Epoxy | TiO2 | 8000Ba | Leveling agent | Benzoin | 701 |
| 150 | 150 | 102 | 90 | 4 | 2 | 2.5 |
◎Specifications I
| Appearance | White or Light Yellow Transparent Flakes |
| Acid Number (mgKOH/g) | 74～82 |
| Softening Point (℃) | 90～103 |
| Glass Transition Temp. ( ℃) | ~ 52 |
| Melting Viscosity (ICI, mPa·s/200℃) | 500~1500 |
| Reactivity at 180℃ (s, 50% 014U) | 80~150 |
| Curing Requirement | 130℃×15-20min or intermediate infrared × 3min |
| Packaging | PE Bags, Net Weight 25kg ± 0.1kg / bag |
◇Specifications II:
| Extrusion Condition | Two-screw Extruder |
| Jacket temperature | 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) | 70~140 |
| Horizontal Flow (180℃, mm) | 20~25 |
| Gloss (60°) | ≥95% |
| Bending(φ1mm) | 2T |
| Adhesive (1mm, grade) | 0 |
| Pencil Hardness | ≥1H |
| Impact (50cm) | +30,-20 |
◇More Code
| Code | Ratio | Cure Cycle | Acid Value (mgKOH/g) | Viscosity (mPa.s/200℃) | Tg (℃) | Reactivity (s/180℃) | Properties |
| NH2533 | 50/50 | 130℃*15-20min | 68~75 | 1500~3500 | ~54 | 30-110 | Low curing temperature, excellent storage stability, excellent chemical resistance and outstanding mechanical performance. |
| NH2535 | 50/50 | 130℃*15-20min or intermediate infrared*3min | 74~82 | 500~1500 | ~52 | 80-150 | Excellent degassing performance and good board appearance, designed for thermosensitive substrate. |
| MDF Resins | 50/50 | 140℃×15-20min or infrared 3min | 68~75 | 500~2000 | ~50 | 60-100 | Good leveling, good mechanical properties, good storage stability amd low curing temperature. |
◇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), 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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