⭐ What Is MOCA?

MOCA (4,4'-Methylene-bis(2-chloroaniline)) is a highly important chain extender used in the production of polyurethane elastomers.
It is typically used with MDI-based polyurethane prepolymers and enables the formation of high-performance elastomers.

MOCA is an aromatic diamine compound that provides strength, elasticity, and mechanical durability.

🔧 What Is MOCA Used For?

The primary function of MOCA is to react with the isocyanate groups in the prepolymer, extending the polymer chains, increasing crosslink density, and enhancing the final elastomer properties.

Key functions of MOCA:

✔ 1. Produces Polyurethane Elastomers

MOCA reacts with MDI prepolymers to create very high-performance polyurethane elastomers.

✔ 2. Provides High Mechanical Strength

Elastomers produced with MOCA exhibit:

• High tensile strength
• Excellent tear resistance
• Very high abrasion resistance
• High load-bearing capacity

✔ 3. Balances Hardness and Elasticity

MOCA can produce PU systems that are both strong and flexible.

✔ 4. Improves Thermal and Chemical Resistance

MOCA-crosslinked elastomers resist high temperatures and harsh chemical environments.

🎯 Purposes of MOCA

✔ 1. Manufacturing High-Performance PU Elastomers

Common uses include:

• Industrial wheels and rollers
• Conveyor system components
• Mining equipment elastomers
• Heavy-duty seals
• Vibration and impact absorbers
• Molded polyurethane parts

✔ 2. Hot-Cast Molding Applications

MOCA is the standard chain extender for hot-cast polyurethane systems.

✔ 3. Components Under Heavy Mechanical Load

Its superior abrasion and impact resistance make it ideal for:

• Press pads
• Cable sheaves
• Heavy-duty couplings

✔ 4. Chain Extender for MDI Prepolymers

MOCA is the most widely used chain extender for MDI-based systems.

🏭 Industries That Use MOCA

• Mining
• Metal processing
• Logistics & material handling
• Automotive and heavy industry
• Rubber & polyurethane manufacturers
• Machinery spare parts production
• Industrial casting & coating companies

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