Solvent Red 179 (Everkem) by Everkem is an anthraqquinone compound. It is a soluble dye. Exhibits heat-, light- and migration resistance. Suitable with restriction for ABS (acrylonitrile butadiene styrene). Recommended for GPPS (general purpose polystyrene), PC (polycarbonates), PS (polystyrene), PET (polyethylene terephthalate), PMMA (polymethylmethacrylate), PBT (polybutylene terephthalate) and AS. Solvent Red 179 (Everkem) complies with Regulation 1907/2006 of the European Community concerning the registration, evaluation and authorization of chemical substances.
Shaanxi Medibridge Biotech Co., Ltd. has been committed to supplying research-grade raw materials to laboratories worldwide, accumulating rich experience in synthesis, purification, and quality control. From gram-level to multi-kilogram-level orders, we can guarantee batch-to-batch quality consistency.
Performance indicators
In scientific evaluation, Solvent Red 179 is not judged simply by how red it appears. More importantly, researchers focus on its structure–property relationship within the target system, especially its behavior in solvents, polymers, coatings, and other non-aqueous applications.
1. Solubility and Compatibility
This is one of the most critical parameters. If the dye cannot remain stably dissolved or well dispersed in the system, problems may occur such as crystallization, blooming, speck formation, and phase separation or migration during storage.
Typical evaluation includes:
- Solubility in different organic solvents
- Saturation loading in different resins
- Precipitation threshold at different temperatures
2. Thermal Stability
Thermal stability is especially important in plastic processing, where extrusion, injection molding, and blow molding often involve elevated temperatures. Insufficient heat resistance may lead to color darkening, yellowing or browning, odor caused by decomposition, and loss of tinting strength.
Common test methods include:
- TGA for thermal weight-loss behavior
- DSC for thermal transition and crystallization-related analysis
- Processing simulation followed by color difference measurement after high-temperature exposure
3. Light Stability
Compared with some inorganic pigments, solvent dyes are generally more prone to photobleaching. For this reason, research often examines whether Solvent Red 179 shows fading under UV or visible light exposure and whether degradation products are formed.
Typical methods include:
- Xenon lamp aging
- UV accelerated aging
- UV-Vis, color difference, and structural analysis before and after aging
4. Migration and Extraction Resistance
This is highly important for practical applications. If the dye molecule is too small or interacts too weakly with the matrix, it may migrate to the surface or be extracted by oils or solvents.
Research typically focuses on:
- Migration after contact with plasticizers
- Extraction behavior in oils, alcohols, and cleaning agents
- Cross-transfer or contamination in multilayer packaging or contact materials
Research Focus (Molecular Level)
Why does it appear red?
Because the π-conjugated system of the molecule absorbs wavelengths in the blue-green region of visible light, and the remaining reflected/transmitted portion appears red.
Why is it suitable for oil or plastic phases?
Because the molecules are generally hydrophobic, have low polarity, and are more compatible with organic media or polymer segments.
Why do different substrates produce different colors?
Because the microenvironment of the dye molecules differs, which may lead to solvation effects, aggregation effects, differences in intermolecular interactions, resulting in hue shifts, changes in brightness, and even differences in fluorescence.
Typical Application Research Directions
Plastic Coloration
Solvent Red 179 is commonly studied for its performance in thermoplastic polymers, with particular attention to its dispersion behavior within the polymer matrix. Key research focuses include processing temperature resistance, migration resistance, and blooming resistance, as well as its impact on transparency and haze in the final material.
Inks and Coatings
In ink and coating applications, research typically examines its solubility and storage stability in solvent-based systems. Additional evaluation areas include color uniformity after film formation, scratch resistance, and light fastness. Compatibility with resins, plasticizers, and leveling agents is also an important consideration in formulation development.
Functional Materials
If the molecule exhibits strong light absorption or other distinctive optical properties, it may also attract research interest in optical filtering, fluorescent response, and energy-conversion materials. In such studies, greater emphasis is usually placed on absorption spectra, emission behavior, photobleaching, and photostability.
Scientific Representation
From a laboratory research perspective, the systematic characterization of Solvent Red 179 commonly includes the following methods:
|
Research Dimension |
Common Methods |
Purpose |
|
Molecular absorption properties |
UV-Vis |
To measure maximum absorption wavelength, tinting strength, and environmental effects |
|
Purity / composition |
HPLC, LC-MS |
To evaluate main peak purity and impurity profile |
|
Structural features |
FTIR, NMR, MS |
To confirm molecular structure and functional groups |
|
Thermal stability |
TGA, DSC |
To assess suitability for processing conditions |
|
Light stability |
Xenon lamp aging, UV aging |
To evaluate fading behavior and degradation |
|
Color quantification |
CIELAB, colorimeter |
To quantitatively compare color performance in different formulations |
|
Migration / extraction |
Solvent extraction, contact migration testing |
To assess long-term use stability |
In industrial R&D, characterization is not limited to a single test. Instead, the results are interpreted in relation to the target end-use application.
For example, when used in transparent plastic parts, the key evaluation points are often light transmittance, haze, heat resistance, and migration behavior. For coatings, the focus may be more on solubility, storage stability, and weather resistance.
Toxicology & Safety
From both a scientific and regulatory perspective, substances such as Solvent Red 179 should not be assessed solely on their coloring performance. Their exposure pathways and use limitations must also be carefully considered. Safety evaluation becomes particularly important when the product is used in materials that may come into human contact or present a risk of migration.
Key Areas of Focus：
- Raw material purity and impurity control
Many potential risks do not necessarily arise from the main component itself, but rather from unreacted intermediates, by-products, or heavy metal residues.
- Skin contact risk
For applications involving personal care, topical materials, or contact packaging, it is important to evaluate irritation potential, sensitization risk, and extractability.
- Migration and exposure assessment
This is especially important for food-contact materials, children's products, and medical-related materials, where potential transfer and exposure must be carefully reviewed.
- Environmental behavior
This includes considerations such as degradability, waste handling, and ecological exposure.
Important Note
It should be clearly understood that being suitable for industrial coloration does not automatically mean it is suitable for direct use in cosmetics or products with long-term skin contact.
FAQ
What is Solvent Red 179 mainly used for?
Used for coloring plastics, inks, coatings, and resins.
Is Solvent Red 179 water-soluble?
No, it is designed for solvent-based or oil-phase systems.
What are its key advantages?
It offers bright shade, strong tinting strength, and good transparency.
What should be checked before use?
Please check solubility, heat resistance, migration, and compatibility.
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