93/7 Saturated TGIC Polyester Resins with Outstanding Anti-yellowing Properties
◎Introduction
HC7700 is saturated polyester resin, mainly used for polyester/TGIC powder coatings system.
Powder coating is an environmentally friendly coating, but its film formation requires high-temperature baking to melt the powder coating adhered to the substrate, and then cross-link to form a film. In the process of high-temperature baking and film formation, if the film-forming resin, additives, titanium dioxide, and other components are not good in heat resistance, they will usually deteriorate and produce yellow phase substances, which will lead to the appearance of yellowing of the coating film.
Powder coatings are composed of resins, curing agents, additives, pigments, and fillers. The spray construction of powder coating requires baking at a high temperature of about 200 degrees for 10-30 minutes. This makes the organic compounds in powder coating formulations susceptible to being oxidized by excessive temperature, producing yellowing oxides
Some amine curing agents and catalysts in powder coating formulations can also be oxidized and decomposed by high temperatures, which will also cause coating yellowing.
In general, the high-temperature yellowing of powder coatings is essentially due to the insufficient thermal oxidation resistance of organic compounds. Selecting titanium dioxide and defoamer with good heat resistance, optimizing the baking process, and improving the baking equipment are important methods to solve the high-temperature yellowing of powder coatings. Adding a suitable anti-yellowing agent to powder coating formulation is an effective means to improve its high-temperature yellowing. The selection of special resin varieties can give powder coatings better thermal oxygen yellowing properties.
◎Basic Features
Excellent leveling
Good weather resistance
Good mechanical properties
Outstanding resistance to yellowing
Good storage stability
Excellent chemical resistance
◎Recommend Formulation:
| HC7700 | TGIC | Filler ＆ Pigment | Leveling Agent | Benzoin | 701 |
| 558 | 42 | 383 | 8 | 4 | 5 |
◎Specifications I
| Appearance | White or Light Yellow Transparent Flakes |
| Acid Number (mgKOH/g) | 31～35 |
| Softening Point (℃) | 105～115 |
| Glass Transition Temp. ( ℃) | ～65 |
| Melting Viscosity (ICI, mPa·s/200℃) | 4600～6200 |
| Reactivity at 180℃ (s, 7% TGIC) | 130～230 |
| 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) | 260~360 |
| Horizontal Flow (180℃, mm) | 25~30 |
| Gloss (60°) | ≥85% |
| 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 |
| NH3362 | 93/7 | 160℃*15min | 31~36 | 3700~5300 | ~62 | 40-100 | For low bake powder coatings with excellent blooming resistance and outdoor durability, suitable for engineering machinery. |
| NH3363 | 93/7 | 160℃*10min | 31~36 | 3700~5300 | ~60 | 40-100 | General purpose resin to be cured at 160℃. Good flow, good outdoor durability and mechanical properties. |
| NH3365 | 93/7 | 160℃*15min | 31~36 | 4500~6500 | ~63 | 80-180 | General purpose resin to be cured at 160℃. Very good flow, excellent outdoor durability and mechanical properties. |
| NH3366 | 93/7 | 160℃*15min | 31~36 | 4500~6500 | ~62 | 80-180 | For low bake powder coatings with excellent blooming resistance and outdoor durability, suitable for engineering machinery. |
◎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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