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Pigment Red 170

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Origin: China

Cas No: 2786-76-7

Specification: 99%min

Min order Quantity: 1 /kg

Supply Ability: 100 mt/month

Lead time: 7 days for OEM, 3 days for ready goods

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  • Products Specification
  • Product Description

  • Property

    CAS No.: 2786-76-7 Formula: C26H22N4O4 Molecular Weight: 454.47700

    Description

    Naphthol Red (Pigment red 170 or PR170) is an organic pigment extensively used in automotive coatings and painting.
    It is produced synthetically by converting p-aminobenzamide into the corresponding diazonium compound followed by diazotation with 3-hydroxy-2-naphththoic acid (2-ethoxy)anilide.
    In the solid state the hydrazo tautomer forms and several crystal structures exist. In the initial α polymorph the molecules are arranged in a herringbone pattern with extensive hydrogen bonding. The φ polymorph is more dense and more stable and produced industrially by thermal treatment in water at 130°C under pressure. In this phase the molecules are planar and arranged in layers. Extensive hydrogen bonding exists within the layer but between layers the only interactions are Van der Waals forces. Dense crystal structures are preferred for pigments used in coatings because in the event of photochemical decomposition the fragments are locked in place and are able to recombine. Research shows that by replacing the ethoxy group in this compound by a methoxy group the crystal structure is less stable and in the final application and the color fades more easily. By careful selection of substituents it is possible to optimize crystal structure and improve optical properties .

    Basic Info

    Chemical Name Pigment Red 170
    Synonyms

    PR170 F5RK;
    NAPTHOL RED F3RK;
    Fast Red F2RK;
    F2RK;
    CIPIGMENTRED170;
    C.I. Pigment Red 170;
    NAPTHOL RED F5RK;
    F5RK;
    PR170 F3RK;

    CAS No. 2786-76-7
    Molecular Formula C26H22N4O4
    Molecular Weight 454.47700
    PSA 126.37000
    LogP 6.48400

    Properties

    Density 1.31g/cm3
    Boiling Point 268-269 °C758 mm Hg(lit.)
    Melting Point 37-39 °C(lit.)
    Flash Point >230 °F
    Refractive Index 1.657
    Vapor Pressure 3.4E-18mmHg at 25°C

    Safety Info

    HS Code 3204170000
    WGK Germany 3

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