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PHENODUR PR 263/70B
- Product Code : PHENODUR PR 263/70B
- Manufacture : Allnex - Thailand
- Packing : 200 KG/DRUM
- Description :
Curable phenolic resin
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Product name: PHENODUR PR 263/70B
Made in: Thailand
Packing: 200 Kg/Drum
Description: Curable phenolic resin
Performance: low viscosity and good pigment wetting properties, Phenodur PR 263 imparts good hiding and filling power. Primers based on Phenodur PR 263 show excellent water resistance and corrosion protection
Specifications:
- Non-Volatile 3251 (1 h; 135 °C; 2 g; B): 68 - 72 %
- Density 20° C: 1,06 g/cm³
- Flash Point: 48° C
- Non-volatile, by vol: 65.0%
- Water content: ≤0.1%
- Iodine Colour Numbe 50% B: <= 15
- Dynamic Viscosity 50% B (23 °C): 390 - 530 mPa.s
Applications: Corrosion protection primer
PROCESSING:
Pigmentation: Phenodur PR 263 has excellent pigment wetting properties and is used preferably as grinding medium to which the polyvinylbutyral is added after the pigment wetting process. Zincphosphates and chromates are partly included in the chemical reaction of the wash primer`s curing process, thereby improving the quality to the primer with regard to weather resistance. Any other extenders and pigments employed should be resistant to phosphoric acid.
Stoving conditions: Depending on the form of use and required coating thickness, the stoving conditions are between 30 and 10 minutes at 180 - 220 °C. The upper temperature limit where overstoving begins to occur and flexibilty accordingly starts to decline is 220 °C. For thin film such as can coatings, conditions of 10 - 15 min/190 - 200 °C are adequate, or 90 s/265 °C (shock curing). Good resistance to chemicals is obtained as from 190 °C onwards.
Acid catalysis:
a) One pack system: about 5 % phosphoric acid (85 %), calculated on total binders (solid);
b) Two-pack systems: about 5 - 10 % phosphoric acid (85 %), calculated on total binders (solid). An excess of more than 10 % phosphoric acid may promote subcoating rust development. To avoid the processing difficulties that may occur when the paint formulation is mixed with phosphoric acid it has been found useful to dilute the acid in advance with n-butanol in a ratio of about 3 : 1. Since Phenodur PR 263 is severely discoloured by dissolved metall ions, especially those of iron, it is advisable to use iron free phosphoric acid (85 %).
STORAGE:
At temperatures up to 25 °C storage stability packed in original containers amounts to at least 365 days
