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Pigment red 2 is recommended for textile printing, water based inks. Suggested for water based decorative paint, offset inks,NC inks.
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Original Color: |
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Reduced Color: |
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Synonyms: |
Pigment Red 2; Permanent Red F2R; Fast Red F2R |
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Chemical type: |
Mono azo |
Molecular formula: |
C23H15CI2N3O2 |
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CAS No. |
6041-94-7 |
Molecular weight: |
436.29 |
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EINECS No. |
227-930-1 |
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Molecular structure: |
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| Appearance: | Red powder |
| Shade: | Similar to the standard |
| Colorimetric value: | ∆E≤1.0 |
| Tinting strength: | Corresponding to standard (100±5)% |
| PH Value: | 6.0 – 8.0 |
| Oil absorption: | 40-50% |
| Specific gravity: | 1.4 g/cm3 |
| Heat Resistance: | 160°C |
| Light fastness: | 6 |
| Water resistance: | 5 |
Pigment Name: C. I. pigment red 2 (C.I; P.R.2)
Alias: Naphthol red FRR; YONGGU red FRR; Naphthol Red FRR; Permanent Red FRR
Chemical name: 4-[(2,5-dichlorophenyl)azo]-3-hydroxy-N-phenyl-2-Naphthalenecarboxamide
Physical and chemical properties: Solubility: red light purple in concentrated sulfuric acid, orange red after dilution; In the case of concentrated nitric acid, it is bright red with blue light; It does not change in sodium hydroxide solution. Hue or shade: yellow red relative density: 1.37-1.46 bulk density / (LB / gal): 11.4-12.2 melting point / ℃: 300-311 average particle size/ μ m: 15 particle shape: sheet specific surface area / (m2 / g): 20; 30 pH value / (10% slurry): 7.3-7.9 oil absorption / (g / 100g): 36-70 covering power: translucent
Product use of Pigment red 2: It is neutral red, slightly yellow than C.I. Pigment Red 112, but its light fastness is 0.5-1 grade lower than C.I. Pigment Red 112; Mainly used in offset printing and packaging ink, fabric printing and dyeing and viscose fiber paste coloring, less used in paint coloring; The properties of gloss resistant paint, high temperature sterilization and solvent resistance are lower than those of pigment red 112; There are as many as 42 kinds of products on the market.
Principle of synthesis of Pigment red 2: 2,5-dichloroaniline (bright red based GG) is dissolved in hydrochloric acid and water by stirring and cooling. Sodium nitrite solution is added under the liquid surface for diazotization, and then diatomite is added for filtration and standby; The chromophenol as was dissolved in sodium hydroxide solution; Under the liquid level, the diazonium salt solution is added to the coupling, stirred, and then adjusted to weak acidity by acetic acid (or hydrochloric acid), filtered, washed and dried to obtain the product.
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