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DDI (Dimeryl Diisocyanate) CAS No. 68239-06-5 DIMERYL-DI-ISOCYANATE DDI

Dimeryl Diisocyanate

DDI

CAS No. 68239-06-5

Chemical Name: Dimeryl Diisocyanate

Synonyms: 2-Heptyl-3,4-bis(9-isocyanatononyl)-1-pentylcyclohexane

Code: DDI

CAS No.: 68239-06-5

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Product Description
Product Properties
Applications
Packing & Storage
Technical Index

Product Description

DDl is a unique aliphatic diisocyanate which is long-chain compound with a 36-carbon dimer fatty acid.lt gives DDl superior flexibility, water resistance and low toxicity compared to other aliphatic isocyanates.

DDl is a low viscosity liquid that can easily soluble in most polar or non-polar solvents. Based onaliphatic isocyanate,it has the characteristics of non-yellowing.

Product properties & Features

Core Advantages:

Non-yellowing: Fully aliphatic structure without benzene rings, outstanding resistance to UV radiation and thermal oxidative aging.
Low toxicity & high safety: Extremely low vapor pressure (<0.001 Pa at 25 °C) and faint odor, eco-friendly for application.
Low water sensitivity: Long hydrophobic molecular chain provides shielding effect, excellent stability against water, enabling production of stable water-based emulsions.
Superior flexibility: The long C36 chain delivers internal plasticization effect, with excellent low-temperature toughness and high elongation at break.
Good compatibility: Soluble in most polar and non-polar solvents, and features great miscibility with polyols.

Performance Comparison with Traditional Diisocyanates

Item	DDI	Aromatic TDI/MDI	Short-chain Aliphatic HDI/IPDI
Relative molecular weight	600	174 / 250.26	168.2 / 222.2
NCO content, %	13.6 - 15.0 (Customizable)	48.3 / 33.6	49.5 / 37.8
Yellowing Resistance	Non-yellowing	Prone to yellowing	Non-yellowing
Toxicity	Extremely low	High (carcinogenic risk)	Moderate (irritant)
Water Sensitivity	Low (suitable for water-based systems)	High (easy to hydrolyze)	Moderate
Flexibility	Excellent	General	Good
Weather Resistance	Superior	Poor	Good

Applications

Industrial & High-Performance Materials

Solid Rocket Propellants: As a curing agent for hydroxyl-terminated polybutadiene (HTPB)-based propellants, replacing TDI and IPDI, offering low toxicity, moderate reactivity, and lower burning rate
Aircraft Fuel Bladder Tanks: Used in the manufacture of fuel-resistant storage tanks
Polyurethane (Urea) Elastomers: Imparts excellent flexibility and mechanical properties

Adhesives & Sealants

The dimer acid backbone provides superior adhesion performance and flexibility, suitable for demanding durability applications

Coatings & Surface Treatment

Waterborne Coatings: Imparts excellent water resistance and adhesion to coatings
Textile Finishing: Offers outstanding weather resistance, abrasion resistance, and aging resistance as a textile printing and dyeing auxiliary
Leather Treatment: Enhances leather brightness, hand feel, scratch resistance, and water-whitening resistance
Inks, Paper Treatment, Wood Waterproofing Agents

Electronics & New Energy

Electronic Materials (Photoresist Materials): Used in high-end electronic encapsulation

Packing & Storage

50kg/ 190kg/metal drum packaging.

Storage should be cool, dry and ventilated.

The shelf life is 12 months, after the expiration of the re-inspection can still be used. Avoid rain and sun during transportation. Do not mix with strong oxidants.

Technical Index

Item	Index
Appearance	Colorless and transparent oily liquid
lsocyanate content, %	13.60~15.00
Hydrolytic chloride, %	≤0.05
PH value	3.0~7.0
Moisture, %	≤0.02
Viscosity, mPa.s, 20°C	≤170

*NOTE: We can custom-manufacture DDI in accordance with clients' request specifications.

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