Description

2,4-Dioxo-1,3-Diazetidine-1,3-Bis(Hexamethylene) Diisocyanate is a specialized aliphatic diisocyanate monomer featuring a unique diazetidine-dione (uracil) core. This compound is valued for its ability to impart high-performance characteristics such as enhanced thermal stability, chemical resistance, and weatherability into advanced polymer systems. It is primarily sought by R&D and production teams in the coatings, adhesives, sealants, and elastomers (CASE) industries, as well as for the synthesis of specialty polyurethanes and polyurea materials.

Application

• High-Performance Polyurethane Coatings: Used as a crosslinker in automotive clear coats, industrial maintenance coatings, and aerospace finishes for superior gloss retention and durability.
• Light-Stable Adhesives & Sealants: A key raw material for formulating non-yellowing, UV-resistant adhesives and sealants for outdoor and architectural applications.
• Specialty Elastomers: Serves as a monomer in the production of advanced polyurethane and polyurea elastomers requiring excellent mechanical properties and chemical resistance.
• Polymer Modification: Employed to modify and enhance the properties of various polymers, introducing reactive isocyanate groups for further functionalization.
• Pharmaceutical & Agro-chemical Intermediates: Utilized in organic synthesis as a building block for active ingredients and other fine chemicals, leveraging its reactive bifunctional nature.
• Advanced Composite Materials: Incorporated into resin systems for composites that demand high thermal and environmental stability.

Basic Information

Product Name	2,4-Dioxo-1,3-Diazetidine-1,3-Bis(Hexamethylene) Diisocyanate
CAS No.	23501-81-7
Molecular Formula	C₁₄H₂₀N₄O₄
Molecular Weight	308.33 g/mol
Synonyms	1,3-Bis(6-isocyanatohexyl)-2,4-dioxo-1,3-diazetidine; Hexamethylene Diisocyanate Urethdione Dimer; Uretdione of Hexamethylene Diisocyanate; HDI-Uretdione; HDI-Dimer; Aliphatic Diisocyanate Dimer; Asymmetric Uretdione Diisocyanate; Blocked HDI Dimer
EINECS	Contact for details

Quality Control

Every batch of our 2,4-Dioxo-1,3-Diazetidine-1,3-Bis(Hexamethylene) Diisocyanate is produced and tested under a strict quality management system. We ensure compliance with relevant industry standards and customer-specific requirements. Comprehensive analytical testing, including assay (NCO content), purity by HPLC, and identification by FT-IR, is performed. A Certificate of Analysis (COA) detailing all specifications and test results is provided with each shipment to guarantee traceability and consistent quality.

Storage

Preserve in a tightly closed, moisture-proof container under a dry inert atmosphere (e.g., nitrogen), protected from light. Store in a cool, well-ventilated area at temperatures recommended on the specific product label or Safety Data Sheet (typically 15-25°C). Due to its moisture-sensitive and highly volatile nature, keep containers sealed when not in use and away from heat, sparks, and open flame. Separate from strong bases, acids, and alcohols.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (NCO Content)	≥ 27.0 %
Purity (HPLC)	≥ 98.0 %
Hydrolyzable Chloride	≤ 0.01 %
Viscosity (25°C)	Contact for details
Specific Gravity (25°C)	Contact for details

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.