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Thiodiglycol ethoxylate is a nonionic, sulfur-containing polyether obtained through the controlled ethoxylation of thiodiglycol with ethylene oxide.
Thiodiglycol ethoxylate's structure contains a central thioether linkage (–S–) and repeating ethoxy (–CH₂CH₂O–) units, which provide hydrophilic character and efficient surface-active properties.
Thiodiglycol ethoxylate functions primarily as an emulsifier, wetting agent, and dispersant in textile processing, coatings, inks, polymer systems, and specialty chemical applications.
General Formula: HO–(CH₂CH₂O)ₙ–CH₂CH₂–S–CH₂CH₂–O–(CH₂CH₂O)ₙ–H
Synonyms: Thiodiethylene glycol ethoxylate, TDG ethoxylate, Ethoxylated thiodiglycol, Polyoxyethylene thiodiglycol, Thiodiglycol polyethoxylate, Ethoxylated thiodiethylene glycol, Polyethylene glycol thioether, PEG thiodiglycol ether, Sulfur-containing ethoxylate, Nonionic thioether surfactant, Thioether polyoxyethylene derivative, Thiodiglycol EO adduct, Ethylene oxide adduct of thiodiglycol, Thiodiglycol polyether, Polyoxyethylene thioether compound
Thiodiglycol ethoxylate is a nonionic polyether compound produced by the reaction of thiodiglycol with ethylene oxide.
Thiodiglycol ethoxylate's structure contains a central thioether linkage (–S–) and repeating ethoxy (–CH₂CH₂O–) units, which provide hydrophilic character and surface activity.
Depending on the degree of ethoxylation, Thiodiglycol ethoxylate's water solubility and hydrophilic–lipophilic balance vary, making it suitable for different formulation needs.
Thiodiglycol ethoxylate functions primarily as an emulsifier, wetting agent, and dispersant in textile processing, coatings, inks, and specialty chemical applications.
Thiodiglycol ethoxylate is generally stable under normal storage conditions but should be protected from strong oxidizing agents and excessive heat.
Thiodiglycol ethoxylate is used to formulate brightener additives and it is known for its stellar performance in combination with nonionic and anionic surfactants
Thiodiglycol ethoxylate is a nonionic, sulfur-containing polyether obtained through the controlled ethoxylation of thiodiglycol with ethylene oxide.
The molecule is characterized by a central thioether linkage (–S–) connecting two hydroxyethyl groups, which are further extended by repeating ethylene oxide units.
This structure provides a balanced combination of hydrophilic polyoxyethylene chains and a moderately flexible backbone, allowing Thiodiglycol ethoxylate to exhibit efficient surface-active properties.
The degree of ethoxylation directly influences Thiodiglycol ethoxylate's physicochemical behavior, including water solubility, viscosity, cloud point, and hydrophilic–lipophilic balance (HLB), enabling customization for various formulation requirements.
In practical applications, thiodiglycol ethoxylate functions as an emulsifier, wetting agent, dispersant, and solubilizing aid.
Thiodiglycol ethoxylate improves interfacial tension reduction between aqueous and non-aqueous phases, supporting stable emulsions and homogeneous dispersions.
Due to its nonionic character, Thiodiglycol ethoxylate demonstrates compatibility with a broad range of anionic, cationic, and amphoteric systems and maintains performance across a relatively wide pH range.
Thiodiglycol ethoxylate is commonly utilized in textile auxiliaries, coatings and ink formulations, polymer processing systems, and specialty chemical intermediates.
Under normal storage conditions Thiodiglycol ethoxylate remains chemically stable; however, prolonged exposure to strong oxidizing agents or excessive heat may lead to gradual degradation of the polyether chain.
Applications of Thiodiglycol Ethoxylate:
Thiodiglycol ethoxylate is used as a versatile nonionic surfactant in various industrial applications.
Thiodiglycol ethoxylate acts as a wetting agent and dispersant in textile processing, where it improves fiber penetration and ensures uniform dye distribution.
Thiodiglycol ethoxylate functions as an emulsifier and stabilizer in water-based coatings and inks, helping maintain pigment dispersion and formulation stability.
In polymer and latex systems, Thiodiglycol ethoxylate serves as a stabilizing agent that supports consistent particle distribution and film formation.
Thiodiglycol ethoxylate is also utilized in industrial cleaning and agrochemical formulations, where it enhances solubility, spreading performance, and overall formulation efficiency.
Additionally, Thiodiglycol ethoxylate operates as a chemical intermediate in the synthesis of specialty surfactants and performance additives.
Thiodiglycol ethoxylate is used to formulate brightener additives employed in the electroplating industry.
Thiodiglycol ethoxylate is especially effective in brightener formulations for acid zinc electrolytes.
Thiodiglycol ethoxylate is usually employed at a concentration of 0.1 – 5 g/l.
Thiodiglycol ethoxylate has the following advantages in acid zinc electrolytes:
Thiodiglycol ethoxylate prevents charring at high current densities.
Thiodiglycol ethoxylate improves the ductility of the plated metal at high current densities.
Thiodiglycol ethoxylate improves the brightness of the plated metal over the whole range of current densities.
Thiodiglycol ethoxylate performs very well in combination with nonionic and anionic surfactants.
Thiodiglycol ethoxylate is low-foaming.
Thiodiglycol ethoxylate suppresses the formation of foam, especially in combination with Lugalvan NES.
Thiodiglycol ethoxylate's solubilizing action on Lugalvan TC-BAR is comparable to that of Pluriol E 400 or E 600.
Thiodiglycol ethoxylate has no effect on the cloud point of the bath.
Textile processing:
Thiodiglycol ethoxylate acts as a wetting agent and dispersant in dyeing and finishing operations.
Thiodiglycol ethoxylate improves fiber penetration and ensures uniform dye distribution.
Coatings and inks:
Thiodiglycol ethoxylate functions as an emulsifier and dispersion stabilizer in water-based paint and ink formulations.
Thiodiglycol ethoxylate helps maintain pigment stability and consistent viscosity.
Polymer and latex systems:
Thiodiglycol ethoxylate serves as a nonionic surfactant in polymer emulsions.
Thiodiglycol ethoxylate supports particle stabilization and enhances film formation.
Industrial cleaning formulations:
Thiodiglycol ethoxylate works as a solubilizer and surface-active agent in specialty cleaning products.
Thiodiglycol ethoxylate improves compatibility within multi-surfactant systems.
Agrochemical formulations:
Thiodiglycol ethoxylate is used as a dispersant and emulsifying aid in pesticide and herbicide concentrates.
Thiodiglycol ethoxylate enhances dilution stability and spreading efficiency.
Chemical intermediate:
Thiodiglycol ethoxylate functions as a building block in the synthesis of specialty surfactants and performance additives.
Nature of Thiodiglycol Ethoxylate:
Thiodiglycol ethoxylate is a nonionic, sulfur-containing polyether compound characterized by the presence of a thioether linkage within its molecular backbone and multiple ethoxy units derived from ethylene oxide.
Due to its structure, Thiodiglycol ethoxylate does not ionize in aqueous media and therefore behaves as a nonionic surfactant.
The molecule exhibits amphiphilic properties, combining hydrophilic polyoxyethylene chains with a comparatively less polar backbone, which enables surface-active performance.
Thiodiglycol ethoxylate is generally stable under neutral conditions but may show sensitivity toward strong oxidizing agents because of the sulfur functionality.
Depending on the degree of ethoxylation, Thiodiglycol ethoxylate may appear as a viscous liquid or semi-solid material and functions primarily as an emulsifying, dispersing, and wetting agent in industrial systems.
Benefits of Thiodiglycol Ethoxylate:
High formulation flexibility:
Thiodiglycol ethoxylate provides adjustable hydrophilic–lipophilic balance depending on the degree of ethoxylation, allowing formulators to tailor solubility and performance.
Excellent surface activity:
Thiodiglycol ethoxylate effectively reduces surface and interfacial tension, improving wetting, spreading, and emulsification efficiency.
Broad compatibility:
Thiodiglycol ethoxylate is compatible with anionic, cationic, and amphoteric systems due to its nonionic structure, enabling stable multi-component formulations.
Good chemical stability:
Thiodiglycol ethoxylate remains stable under normal storage conditions and performs consistently across a wide pH range.
Improved dispersion stability:
Thiodiglycol ethoxylate enhances pigment, polymer, and solid particle stabilization, preventing sedimentation and phase separation.
Low foam tendency:
Thiodiglycol ethoxylate generally exhibits controlled foaming behavior, which is advantageous in industrial processing systems.
Process efficiency support:
Thiodiglycol ethoxylate improves penetration and uniformity in textile and coating applications, contributing to consistent product quality.
Stability and Reactivity of Thiodiglycol Ethoxylate:
Chemical stability:
Remaining chemically stable under normal conditions of use, handling, and storage.
Reactivity:
Showing no hazardous reactions under normal conditions.
Conditions to avoid:
Avoiding excessive heat.
Avoiding prolonged exposure to air.
Avoiding contact with strong oxidizing agents.
Incompatible materials:
Avoiding strong oxidizers.
Avoiding strong acids.
Avoiding strong bases.
Hazardous decomposition products:
Producing carbon oxides (CO, CO₂) during thermal decomposition.
Producing sulfur oxides (SOₓ) during thermal decomposition.
Handling and Storage of Thiodiglycol Ethoxylate:
Handling:
Following good industrial hygiene and safety practices.
Avoiding direct contact with skin and eyes.
Ensuring adequate ventilation during handling.
Storage:
Storing in a cool, dry, well-ventilated area.
Keeping containers tightly closed when not in use.
Storage conditions:
Protecting from moisture.
Protecting from heat.
Protecting from oxidizing substances.
Packaging materials:
Using tightly sealed steel, plastic, or other compatible containers.
Shelf life:
Maintaining stability for extended periods when properly stored in sealed containers.
First Aid Measures of Thiodiglycol Ethoxylate:
Inhalation:
Moving the affected person to fresh air.
Seeking medical attention if symptoms persist.
Skin contact:
Washing thoroughly with soap and water.
Removing contaminated clothing.
Eye contact:
Rinsing cautiously with water for several minutes.
Removing contact lenses if present and easy to do.
Seeking medical advice if irritation continues.
Ingestion:
Rinsing mouth with water.
Avoiding induction of vomiting.
Seeking medical attention if discomfort occurs.
Most important symptoms:
Causing possible mild irritation to eyes or skin upon direct contact.
Firefighting Measures of Thiodiglycol Ethoxylate:
Suitable extinguishing media:
Using water spray.
Using foam.
Using dry chemical powder.
Using carbon dioxide (CO₂).
Specific hazards:
Being a combustible organic material.
Generating irritating fumes at high temperatures.
Protective equipment for firefighters:
Wearing self-contained breathing apparatus.
Wearing full protective clothing.
Special precautions:
Avoiding inhalation of combustion gases.
Preventing runoff from entering drains.
Accidental Release Measures of Thiodiglycol Ethoxylate:
Personal precautions:
Avoiding direct contact with spilled material.
Using appropriate personal protective equipment.
Ensuring adequate ventilation.
Environmental precautions:
Preventing large quantities from entering drains, soil, or watercourses.
Methods for cleanup:
Absorbing with inert materials such as sand or vermiculite.
Collecting into suitable containers for disposal according to local regulations.
Exposure Controls / Personal Protection of Thiodiglycol Ethoxylate:
Occupational exposure limits:
Not being specifically established.
Engineering controls:
Providing adequate general or local ventilation.
Personal protective equipment (PPE):
Respiratory protection:
Not being normally required.
Using suitable respiratory protection if ventilation is insufficient.
Hand protection:
Wearing protective gloves during prolonged contact.
Eye protection:
Wearing safety goggles.
Skin protection:
Wearing protective clothing for industrial use.
Hygiene measures:
Washing hands after handling.
Avoiding eating, drinking, or smoking in work areas.
Identifiers of Thiodiglycol Ethoxylate:
Chemical name: Thiodiglycol ethoxylate
Common abbreviations: TDG ethoxylate
Base molecule: Thiodiethylene glycol
Ethoxylation agent: Ethylene oxide
General formula: HO–(CH₂CH₂O)ₙ–CH₂CH₂–S–CH₂CH₂–O–(CH₂CH₂O)ₙ–H
Molecular weight: Depends on number of ethylene oxide units
HLB value: Grade dependent
CAS number: Varies according to ethoxylation degree
EC number: Assigned per specific commercial grade
Ionic character: Nonionic
Appearance category: Liquid to semi-solid (grade dependent)
Properties of Thiodiglycol Ethoxylate:
Physical form: Yellowish to brownish waxy solid
Iodine colour: max. 12
Density: 1.11 – 1.13 g/cm³
Viscosity: 100 – 160 mPa·s
pH: 6.0 – 7.5
Setting point: 24 – 30 °C
Physical state: Viscous liquid to semi-solid (EO dependent)
Colour: Colorless to pale yellow
Odour: Mild, characteristic
Solubility: Water-soluble (increases with EO content)
Density: Grade dependent
Viscosity: EO dependent, typically moderate to high
pH (10% solution): Approximately neutral to slightly acidic
Cloud point: Varies according to ethoxylation degree
Surface tension reduction: High efficiency
HLB value: Adjustable, EO dependent
Specifications of Thiodiglycol Ethoxylate:
Water Content: 1%
Iodine Colour: 12
Density: 1.11 –1.13 g/cm3
Viscosity: 100 –160 mPa · s
pH: 6.0 – 7.5
Setting Point: 24 – 30 °
Primary Chemistry: Thiodiglycol Ethoxylate
