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Rheoflow DS-425 is a modified acrylic copolymer.
Rheoflow DS-425 acts as an excellent wetting & dispersing agent.
Rheoflow DS-425 shows rapid degassing after manufacture of paints & putties and has good flow & leveling properties.
CAS: 7631-86-9
MF: O2Si
MW: 60.08
EINECS: 231-545-4
Synonyms
SILICA GEL 60 PF254 FOR PREPARATIVE LAYE;LICHROSORB SI 100 (10 MYM) 10 G;TLC-SILICA GEL 60 GF254 MEAN PARTICLE SI;LICHROSORB SI 100 (10 MYM) 100 G;SEA SAND EXTRA PURE 5 KG;SILICA GEL 60 GF254 FOR THIN-LAYER CHROM;SILICA GEL 60 PF254 + 366 FOR PREPARATIV;SEA SAND EXTRA PURE 25 KG
Rheoflow DS-425 is suitable for polyester putties, UV-curing coating systems and solvent based coatings.
Excellent stabillity in the dispersion of pigments and extenders is essential for the manufacturing of high quality coatings.
Coating properties such as color strength, brightness, gloss, haze and opacity are entirel dependent upon the degree and quality of the dispersion.
Unstable pigment dispersions cause defects such as floating, flooding, formation of benard-cells and flocculation etc.
These defects can occur after the production stage, during storage or the film formation process.
Rheoflow DS-425 is very suitable for unsaturated polyester and UV-curing systems.
Rheoflow DS-425 reduces the interfacial tension between the hydrophylic pigments/extenders and the hydrophobic binders.
Especialy Rheoflow DS-425 can give rapid degassing and lower viscosity propertiesin the finished products.
And also improved levelling and flow properties.
Rheoflow DS-425 Chemical Properties
Melting point: >1600 °C(lit.)
Boiling point: >100 °C(lit.)
Density: 2.2-2.6 g/mL at 25 °C
Bulk density: 200-800kg/m3
Vapor pressure: 13.3hPa at 1732℃
Refractive index: 1.46
Fp: 2230°C
Storage temp.: 2-8°C
Solubility: Practically insoluble in water and in mineral acids except hydrofluoric acid. Rheoflow DS-425 dissolves in hot solutions of alkali hydroxides.
Form: suspension
pka: 6.65-9.8[at 20 ℃]
Specific Gravity: 2.2
Color: White to yellow
Odor: at 100.00?%. odorless
PH: 5-8 (100g/l, H2O, 20℃)(slurry)
Resistivity: 1∞10*20 (ρ/μΩ.cm)
Water Solubility: insoluble
Sensitive: Hygroscopic
Hydrolytic Sensitivity 6: forms irreversible hydrate
Crystal Structure: Trigonal
Merck: 14,8493
Exposure limits NIOSH: IDLH 3000 mg/m3; TWA 6 mg/m3
Stability: Stable.
CAS DataBase Reference: 7631-86-9(CAS DataBase Reference)
NIST Chemistry Reference: Silicon(iv) oxide(7631-86-9)
IARC: 3 (Vol. Sup 7, 68) 1997
EPA Substance Registry System: Silica (7631-86-9)
ECETOC JACC REPORT: Rheoflow DS-425 (7631-86-9)
ADVANTAGES
Excellent deaerating power during paint manufacturing and mixing process.
Excellent wetting and dispersing effect on filler and pigments.
Good flow and levelling properties.
Good film appearance and recoatable properties.
