Low Curing 50:50 Polyester Epoxy Resin with Good Board Appearance
◎Introduction
HH2535 is a carboxyl terminated saturated polyester resin, which is mainly used in polyester / epoxy powder coating system.
In recent years, powder coatings have developed rapidly. Compared with traditional liquid coatings, powder coatings have the characteristics of energy saving, environmental protection and excellent comprehensive performance. At present, the curing time of most powder coatings is about 180-200 degrees Celsius. With the strengthening of the concept of energy saving and environmental protection in today's society, low temperature curing powder coatings is a development trend. In addition, some heat-sensitive substrates, such as MDF, are also temperature-sensitive and require low temperature curing.
The main raw material of powder coating is polyester resin. To reduce the curing temperature of powder coating, it is mainly required that polyester resin can be cured at low temperature. Lowering the curing temperature necessarily requires high reactivity of the resin, and high reactivity can have a certain impact on the performance of the coating. The existing powder coating systems mainly have the following problems when used for low temperature curing. On the one hand, the reactivity of the system is not enough, the powder coating cannot be completely cured, and the coating performance is not ideal; in order to achieve the reactivity required for low-temperature curing, polyester resins often have higher melt viscosity and higher reactivity, and at low temperatures conditions cannot be adequately leveled. These greatly affect the decorative properties of powder coatings.
HH2535 greatly improves the reactivity, and at the same time has board appearance and excellent degassing performance. When the resin is applied to powder coatings, it achieves low-temperature curing very well, the coating has good adhesion to the substrate, and has good leveling and stability, and chemical resistance, designed for thermosensitive substrate.
◎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:
| Appearance | White or pale yellow transparent flakes |
| Acid Value (mgKOH/g) | 74～82 |
| Softening Point (℃) | 90～103 |
| Glass Transition Temp. (℃) | ～52 |
| Melting Viscosity (200℃, ICI, mPa·s) | 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 |
◎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 | 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. |
◎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.
