Overview
m-Xylylenediamine (MXDA) is an aromatic diamine primarily used as a high-performance curing agent for epoxy resins. Its molecular structure features two reactive amino groups, enabling cross-linking with epoxies to form durable polymers. MXDA is favored in industries requiring robust chemical resistance and mechanical strength, such as aerospace, automotive, and construction. First synthesized in the mid-20th century, MXDA gained prominence due to its balanced properties—low viscosity, fast curing, and compatibility with diverse formulations. It is commercially produced via hydrogenation of isophthalonitrile or similar intermediates, with strict quality control to ensure consistency.
Physical and Chemical Properties
MXDA is a colorless to light-yellow liquid with a mild amine odor. It has a density of 1.05 g/cm³ and boils at 247°C, making it stable under typical processing conditions. The compound’s solubility in water and organic solvents like ethanol facilitates its use in liquid formulations. Key chemical properties include its high reactivity with epoxies, forming tightly cross-linked networks. MXDA’s thermal stability (up to 150°C post-cure) and resistance to hydrolysis make it suitable for harsh environments. However, it is sensitive to moisture and CO2, which can cause carbamate formation if improperly stored.
Main Applications
MXDA’s primary application is as an epoxy curing agent for coatings, adhesives, and composite materials. In coatings, it enhances durability for marine, industrial, and automotive finishes. Adhesives formulated with MXDA exhibit strong bonds for metals and plastics, often used in structural applications. The compound also serves in electrical encapsulation and 3D printing resins, where precision and thermal resistance are critical. Additionally, MXDA derivatives are explored in pharmaceuticals and agrochemicals, though these niches require ultra-high-purity grades.
Safety and Storage
MXDA is corrosive and can cause skin burns, eye damage, and respiratory irritation. Proper PPE—nitrile gloves, goggles, and respirators—is mandatory during handling. Spills should be neutralized with acids (e.g., vinegar) and contained with absorbents. Storage requires airtight containers (typically 200kg drums or IBCs) in cool, dry areas away from oxidizers. Shelf life is approximately 12 months under nitrogen blanket to prevent degradation. Transport regulations classify MXDA as a Class 8 hazardous material (corrosive).
B2B Procurement Guide
When procuring MXDA, prioritize suppliers with ISO 9001 certification and batch-specific COAs (Certificates of Analysis). Key specifications include purity (≥98%), water content (<0.5%), and amine value (820–840 mg KOH/g). Bulk pricing varies by volume and region, with discounts for multi-ton orders. Logistics should ensure temperature-controlled transport if ambient temperatures exceed 30°C. Alternatives like diethylenetriamine (DETA) may be considered for cost-sensitive applications, though with trade-offs in performance.
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