What is Triethyl Citrate
Triethyl Citrate (TEC) is a triester of citric acid and ethanol, serving as a high-quality, environmentally friendly plasticizer. For precision and clarity in technical documentation, it is also known by its systematic IUPAC name, triethyl 2-hydroxy-1,2,3-propanetricarboxylate. As a non-toxic plasticizer, people widely use triethyl citrate in food packaging films, childcare articles, and medical devices.
Chemical Reaction for Synthesis
People produce Triethyl Citrate through an esterification reaction between citric acid and ethanol, with an acid catalyst and under heat. The reaction produces water as a byproduct.
Chemical Equation:
C₆H₈O₇ (Citric Acid) + 3 C₂H₅OH (Ethanol) → C₁₂H₂₀O₇ (Triethyl Citrate) + 3 H₂O (Water)
Key Performance & Properties of High Quality Triethyl Citrate Plasticizer
- Compatibility: Excellent with a wide range of polymers, including PVC, polyvinylidene chloride (PVDC), cellulose acetate, and nitrocellulose.
- Safety: Non-toxic, non-irritating, and approved by global regulatory bodies like the FDA (for food contact), the European Food Safety Authority (EFSA), and for use in pharmaceutical and cosmetic products. Therefore, serving as a phthalate-free plasticizer.
- Plasticizing Efficiency: An efficient primary plasticizer that provides good low-temperature flexibility and moderate gelation speed.
Mechanism of Action as a Plasticizer
The primary function of a plasticizer is to reduce the brittleness and rigidity of a polymer. Here’s how Triethyl Citrate works:
- Intercalation: TEC molecules are introduced into the polymer melt (e.g., PVC) during processing.
- Polar Interaction: The polar ester groups (-C=O) on the TEC molecule are attracted to and form temporary, secondary bonds with the polar sites on the polymer chains (e.g., the chlorine atoms in PVC).
- Spacing Effect: These TEC molecules physically force the polymer chains apart, increasing the free volume between them.
- Reduced Chain Interaction: By separating the chains, TEC reduces the strength of the dipole-dipole attractions between them.
- Increased Flexibility: With weaker intermolecular forces, the polymer chains can slide past each other more easily when a force is applied. This results in a material that is softer, more flexible, and more durable at lower temperatures
Common Applications
Triethyl Citrate is a versatile additive which people use it across multiple industries:
Plastics & Packaging: A Primary PVC Plasticizer
As a primary plasticizer for PVC, PVDC, and other polymers, especially for child-safe toys.
Pharmaceuticals: A Safe Plasticizer for Tablet Coatings
As a plasticizer in the coatings of tablets and capsules
Cosmetics & Personal Care: A Versatile Solvent and Fixative
As a solvent, fixative, and carrier for fragrances and flavors in perfumes, lotions, and creams.
Key Advantages of Triethyl Citrate as a Plasticizer
- Non-Toxicity & Safety: This is its most significant advantage. It is compliant with stringent regulations for food contact, toys, and medical devices, making it an ideal replacement for phthalates.
- Excellent Compatibility: It works effectively as a primary plasticizer with many common polymers without exuding or bleeding out.
- Low Volatility: It has a low vapor pressure, meaning it does not easily evaporate from the finished product, ensuring long-term flexibility and preventing surface stickiness.
- Good Extraction Resistance: Products plasticized with TEC show good resistance to extraction by water, soapy water, and oils.
- Biodegradability: Derived from natural sources, it breaks down more easily in the environment compared to petroleum-based plasticizers.
- Versatility: Its approval for use in food, pharmaceuticals, and cosmetics, in addition to plastics, makes it an extremely versatile additive for manufacturers.
In summary, Triethyl Citrate stands out as a high-quality, versatile, and safe plasticizer suitable for the most demanding applications. Its non-toxic profile and excellent performance make it the ideal choice for manufacturers aiming to meet the highest safety and environmental standards.
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Related Links: Dimethyl Adipate, Dimethyl Glutarate, High Purity Tributyl Citrate Plasticizer
