TEA isophthalate

What is TEA isophthalate

**Introduction to TEA Isophthalate** TEA Isophthalate (Triethanolamine Isophthalate) is a specialized chemical compound widely used as a corrosion inhibitor, particularly in metalworking fluids and industrial coolants. Its unique molecular structure combines triethanolamine (TEA) with isophthalic acid, offering excellent chelating properties that protect metal surfaces from rust and oxidation. This water-soluble additive is valued for its stability, efficiency, and environmental safety, making it suitable for automotive, aerospace, and manufacturing applications. Additionally, TEA Isophthalate enhances lubricity, extends equipment life, and minimizes sludge formation. Its compatibility with other additives and low toxicity further contribute to its popularity in formulating high-performance, eco-friendly industrial solutions.

Preparation Process: To prepare **TEA isophthalate**, dissolve **isophthalic acid** (1 equiv.) in **triethanolamine (TEA)** (3 equiv.) under stirring at **80–100°C** for **2–4 hours** until complete dissolution. Monitor the reaction by **pH** or **FTIR** to confirm esterification (disappearance of –COOH peaks at ~1700 cm⁻¹). Optionally, use a **catalyst** (e.g., p-toluenesulfonic acid, 1–2 wt%) to accelerate the reaction. Remove residual water via **vacuum distillation** at **100–120°C** to drive the equilibrium toward product formation. Cool the mixture to room temperature to obtain a viscous, clear liquid. Purify by washing with **anhydrous ethanol** and drying under reduced pressure.

Usage Scenarios: TEA isophthalate (triethanolamine isophthalate) is primarily used as a corrosion inhibitor and scale preventer in industrial water treatment systems, particularly in cooling and boiler water applications. It forms a protective film on metal surfaces, reducing oxidation and mineral deposit buildup. The compound also acts as a chelating agent, binding metal ions to prevent scaling and fouling. Additionally, TEA isophthalate is employed in coatings and adhesives, where it enhances durability and adhesion properties. Its stability under high temperatures makes it suitable for use in heat exchange systems. In some formulations, it serves as a crosslinking agent to improve material strength.

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