Kinte Materials Science and Technology Co.,Ltd
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50/50 Polyester Epoxy Resin Anti-sagging Performance for Hybrid Powder Coatings
◎Introduction
HHZ5 is a saturated polyester resin, mainly used for 50/50 polyester/epoxy hybrid powder coatings systems.
Powder coating is a new type of solvent-free solid powder coating. In practical applications, after the spray curing is completed, the edge of the workpiece will have a fat edge phenomenon, which is called sagging. Serious sag defects will directly lower the coating pass rate.
In actual spraying applications, controlling the sagging of the powder in a suitable range can not only obtain suitable leveling performance, but also avoid excessive fat edges and affect the connection of workpieces.
To solve the sagging problem of powder coating, there are the following solutions
1. Select resins with high melt viscosity or high softening point to increase the melt viscosity of powder coatings.
2. Select a resin with higher resin activity to shorten the curing time of the powder coating, or add a curing accelerator to the powder coating to shorten the curing time of the powder coating and reduce the melt level fluidity of the powder coating.
3. Add a corner coverage improver to improve the sagging of the coating film.
4. Properly adjust the variety and dosage of pigments and fillers, or use pigments and fillers with large oil absorption to adjust the melt viscosity of the powder coating and improve the sag of the coating.
◎Basic Features
Excellent mechanical properties
Excellent solvent resistance and bending resistance
Good storage stability and sag resistance
◎Recommend Formulation:
| HHZ5 | E-12 | Filler ＆ Pigment | Leveling Agent | Benzoin | 701 |
| 300 | 300 | 383 | 8 | 4 | 5 |
◎Specifications I
| Appearance | White or Light Yellow Transparent Flakes |
| Acid Number (mgKOH/g) | 68～75 |
| Softening Point (℃) | 95～110 |
| Glass Transition Temp. ( ℃) | ～59 |
| Melting Viscosity (ICI, mPa·s/200℃) | 3500～6500 |
| Reactivity at 180℃ (s, 50% E-12) | 100～220 |
| Curing Requirement | 180℃/15min |
| Packaging | PE Bags, Net Weight 25kg ± 0.1kg / bag |
◇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) | 100~200 |
| Horizontal Flow (180℃, mm) | 24~28 |
| Gloss (60°) | ≥90% |
| Bending (φ1mm) | Pass |
| Adhesive (1mm, grade) | 0 |
| Pencil Hardness | ≥1H |
| Impact (50cm) | Pass |
◎More Code
| Code | Ratio | Cure Cycle | AV (mgKOH/g) | Viscosity (mPa.s/200℃) | Tg (℃) | Reactivity (s/180℃) | Properties |
| HH2581 | 50/50 | 180℃*10min | 67~75 | 2000~3500 | ~55 | 100-200 | For fast cure formulation. Excellent flow and good mechanical properties. |
| HH2582 | 50/50 | 180℃*15min | 67~75 | 2000~3000 | ~59 | 150-250 | Good flow and heat resistance, high gloss, excellent chemical resistance. Suitable for metallic powder coatings. |
| HH2582A | 50/50 | 180℃/15min or 200℃/10min | 65~75 | 1800~3800 | ~54 | 200-320 | The tin-free version of HH2582A |
| HH2583 | 50/50 | 180℃*15min | 67~75 | 3500~5500 | ~55 | 150-250 | Suitable for low gloss powder coatings. Good flow and film fineness, excellent mechanical properties. |
| HH2585 | 50/50 | 180℃*15min | 67~75 | 2000~3500 | ~57 | 100-200 | Economic resin. Suitable for heat transfer print powder coatings with good mechanical properties. |
| HH2586 | 50/50 | 180℃*15min | 68~80 | 5000~8500 | ~60 | 120-200 | Fast cure, excellent flexibility and impact resistance. |
◎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.