1. INTRODUCTION :
YE-7780C is an exterior saturated carboxylic polyester resin curing with TGIC at 93 /7 for
thermosetting powder coating, Except with durability and flow of general polyester resin as well
with excellent heat-resistance up to 270°C for those profiles powder coating which need high heat
resistance.
2. CHARACTERISTICS OF THE RESIN
Appearance……………………….pale granules
Acid value(mgKOH/g)……………………28-36 (1)
Color…………………………………….max.2 (2)
Viscosity at 165°C(mPa..s)……… 41000--60000 (3)
Glass transition temperature (Tg).….approx.64°C (4)
Softening point(°C)……………………110-115
(1)ISO-3682 (2)ASTM-D-2849
(3)ICI CONE & PLATE (4)DSC(METTLER)
3. APPLICATION:
TYPICAL POWDER FORMULA:
Barium sulfate…………………………..100 (1)
Titanium dioxide…………………………300 (2)
Polyester YE-7780C…………………….558
T.G.I.C.…………………………………. 42 (3)
Flow control agent……………………….. 6 (4)
Benzoin ……………………………………3
(1) Shaanxi Fuhua Chemical Co., Ltd
(2) DuPont R-902 or R706
(3)ARADITE PT-810 WPE:107 (Supplier: Ciba-Geigy) Other T.G.I.C. are suitable.
YE-7780C/T.G.I.C. =93/7
(4) YL-1080 (Silica Adsorption 65% Supplied by Yin Yang Resin Co., Ltd)
4.MANUFACTURING PROCEDURE AND TESTING
MANUFACTURING
a. Pre-mixing ( dry blend of the above components)
b. Homogeneous extrude at temperature of 110°C-120°C
c. Cool down and early pieces
d. Abrading powder to obtain a free -flowing powder maximum particle size of 80micron
COATING CONDITION:
Voltage…………………………………. 60-80kv
Air pressure………………………….. 1-2kg-cm2
Test panel……………………….0.35 mm steel panels
CURING CONDITION:
10 minutes at 200°C(object temperature)
TEST RESULT:
Film thickness………………………… 60-80mm
Gloss…………………………………… >90% (1)
Erichsen slow penetration…………….>7mm (2)
Direct/reverse impact……………… >50kg-cm (3)
Conical mandrel………………………. pass (4)
Crosshatch adhesion…………………. Gt=0 (5)
(1)ASTM D-523(60°) (2)DIN 53165
(3)ASTMD-2194 (4)ASTM D-522
(5)DIN53151
5. PACKING AND STORAGE
25 kilogram paper bag or PE bag; Stored in a cool dry indoor place at temperature of
-20°C--35°C, Avoid long-term exposure to direct sunlight, In the above-mentioned storage
conditions the shelf life of resins for 1 year. Experience has shown that the storage life of the
resin up to 3 years, it is proposed that the testing products beyond the shelf-life products can still
be used for qualified.
The above-mentioned indications are based on carefully made tests. No liability can be assumed
in the event of any inaccuracy or incompleteness being found in the value listed above and
consequently we recommend evaluation in your own laboratories prior to use.