MOCA-HR Curing Agent – Heat-Stable, Non-Discoloring Aromatic Diamine

Chemical Information

• Chemical Name: 3,3’-Dichloro-4,4’-diaminodiphenylmethane
• Molecular Formula: C₁₃H₁₂N₂Cl₂
• Molecular Weight: 267.16
• CAS Number: 101-14-4
  
  Specifications Table
  

  Item	Specification
  Appearance	Pale yellow granular pellet (MOCA-HR)
  Melting Point (℃)	≥ 97
  Moisture (%)	< 0.30
  Solid Density (24 ℃) (g·cm⁻³)	1.44
  Liquid Density (107 ℃) (g·mL⁻¹)	1.26
  Amine Equivalent	131 – 136
  Free Amine (%)	< 1.00
  Color (Gardner)	< 4
  Insoluble Matter (%)	< 0.04
  Hygroscopicity	None
  Storage Condition	Airtight storage in a dry area, away from direct sunlight
  Solubility	Easily soluble in DMF, DMSO, MEK and THF; soluble in ethanol, toluene and benzene; insoluble in water.
  Safety	LD₅₀ (rats) ＞ 5000 mg/kg. Wear a mask, gloves and goggles during handling.

  
  

  Advantages

  MOCA-HR is a high-performance aromatic diamine curing agent engineered to deliver exceptional thermal stability and superior color retention under demanding processing conditions.

  Even under prolonged or repeated heating cycles, withstanding peak temperatures of up to 150°C, the molten MOCA-HR maintains a consistently light yellow, clear, and transparent appearance. It exhibits no signs of discoloration, turbidity, or thermal degradation, ensuring stable and predictable curing performance.

  This outstanding thermal and chromatic stability makes MOCA-HR particularly suitable for applications requiring high-temperature processing, re-melting operations, or stringent aesthetic requirements where consistent product appearance is critical.

  
  
  

  Applications

  MOCA-HR is a high-performance aromatic diamine that functions as both a chain extender and curing agent for polyurethane systems. It is specifically formulated for use in cast polyurethane elastomer production, particularly in applications utilizing casting machines for precise and efficient processing.

  
  

  One of its standout features is its ability to impart exceptional light color stability to the final polyurethane products—an essential advantage for applications where appearance, transparency, or color consistency is critical.

  In addition to its role in polyurethane systems, MOCA-HR also serves as an effective curing agent for epoxy resins, offering versatility across different thermoset material formulations.

  
  

  With its excellent thermal stability, consistent performance, and aesthetic benefits, MOCA-HR is an ideal choice for manufacturers seeking high-quality, visually appealing cast elastomers and durable epoxy systems.

  
  
  

  Packaging

  • Net Weight: 50 kg per unit
  • Packaging Material: Carton drum with an inner black polyethylene liner (ensures moisture resistance and product purity)
  
  

MOCA-HR curing agent

heat-stable aromatic diamine

non-discoloring polyurethane additive

MOCA-HR Curing Agent – Heat-Stable, Non-Discoloring Aromatic Diamine Images