Precision Latent Reaction Mechanism: Formed by symmetric aromatic diamine and sodium chloride complex, it exhibits almost no reactivity at room temperature. When heated to the specific deblocking temperature, the complex rapidly decomposes, releasing free diamine that reacts with prepolymers at an ultra-fast speed to form high-performance polyurethane elastomers, achieving precise control over the curing process.
Room-Temperature Processability: It is a liquid suspension with suitable viscosity (500-3000 mPa.s at 30℃), which can be directly and evenly mixed with polyurethane prepolymers at room temperature without pre-melting, eliminating the high-temperature preheating process required for traditional solid curing agents.
MOCA-Equivalent Curing Performance: Delivers vulcanization performance similar to MOCA, while providing an extremely long pot life. No gelation occurs when mixed with prepolymers without heating, which fully guarantees sufficient operation time for complex construction and molding processes.
Stable and Controllable Technical Indicators: Water content is controlled below 800ppm, solid content is approx. 44%, and amino equivalent is approx. 248 (subject to the COA of each batch). Strict batch-to-batch quality control ensures stable reactivity and consistent product performance.
Wide Process Adaptability: Perfectly adapts to atmospheric pressure casting, pressure or injection molding, rotary casting, in-reactor impregnation, microwave vulcanization and other molding technologies. It is especially suitable for large-area construction, precision casting, complex structure part manufacturing, and other processing forms with high requirements for operation time and stability.
Multi-Scenario Versatility: In addition to being used as a high-performance chain extender for polyurethane elastomers, it can also be used as a curing agent for one-component polyurethane adhesives and one-component synthetic leather slurries, endowing the final products with excellent comprehensive performance.
| Chemical Name | 4,4'-Methylenedianiline Sodium Chloride Complex Dispersion |
| CAS NO. | 21646-20-8 |
| Appearance | White to slightly yellow flowable suspension |
| Odor | Slight amine odor |
| Viscosity (30℃) | 500-3000 mPa.s |
| Water Content | <800ppm |
| Solid Content | Approx. 44% |
| Amino Equivalent | Approx. 248 (subject to COA of each batch) |
| Shelf Life | ≥12 months under sealed and dry conditions |
Ultra-Long Operation Window: No gelation occurs at room temperature after mixing with prepolymers, which solves the common pain point of short operation time of traditional curing agents. It provides sufficient time for large-area construction, complex mold filling and batch mixing, greatly reducing the scrap rate caused by premature curing.
Simplified Production Process: Room-temperature liquid form eliminates the pre-melting process required for traditional solid curing agents (such as MOCA), reduces energy consumption and labor input, avoids the risk of material degradation and safety hazards caused by high-temperature operation, and improves production efficiency.
Balanced Controllability & Curing Efficiency: The latent reaction design ensures stable storage and mixing at room temperature, and triggers rapid and uniform curing after heating. The cured products have excellent mechanical properties, wear resistance, tear resistance and dimensional stability, which are comparable to or even better than traditional MOCA systems.
Unmatched Process Compatibility: Adapts to almost all mainstream polyurethane molding processes, from small-batch precision casting to large-scale continuous production, from room-temperature construction to microwave rapid vulcanization, with strong versatility, no need to adjust the original production process of customers.
Excellent Storage Stability: Sealed storage under normal temperature conditions, the product performance is stable for a long time, no stratification, no precipitation, no reactivity decay, and the shelf life is more than 12 months.
Environmentally Friendly & Operator-Friendly: Only slight amine odor, no pungent smell, which improves the working environment for operators. It is non-toxic, no harmful by-products during the curing process, and fully meets the global environmental protection and occupational health requirements.
Reduce production costs and improve efficiency: The room-temperature processable design eliminates the pre-melting process, reduces energy consumption and labor costs, and the ultra-long operation window reduces the scrap rate, effectively optimizing the comprehensive production cost of enterprises.
Break through the limitations of traditional processes: It solves the process problems of traditional curing agents such as difficult molding of complex structural parts, uneven performance of large thick-walled products, and difficult large-area construction, helping enterprises expand the application scenarios of products and develop high-end markets.
Improve product core competitiveness: The cured products have excellent and stable comprehensive performance, which can meet the harsh performance requirements of heavy-duty, high-wear and high-precision application scenarios, and enhance the market competitiveness of products.
Realize multi-scenario universal application: One product can be used in polyurethane elastomers, one-component adhesives, synthetic leather slurries and other fields, reducing the cost of raw material procurement, inventory management and production switching for enterprises.
Ensure stable large-scale production: Strict batch quality control ensures consistent performance of each batch of products, avoids quality fluctuations caused by unstable raw materials, and provides reliable guarantee for large-scale continuous production of enterprises.
One-Component Polyurethane Adhesives: Used as a high-performance latent curing agent for one-component polyurethane adhesives. The prepared adhesives have excellent bonding strength, water resistance, weather resistance, aging resistance and medium resistance, and are widely used in construction bonding, automotive interior and exterior assembly, industrial composite material lamination, packaging bonding, electronic component fixing and other scenarios.
One-Component Synthetic Leather Slurries: Applied in one-component polyurethane synthetic leather slurries for artificial leather, super fiber materials, luggage and footwear fabrics. It provides controllable curing performance, improves the dry and wet rubbing resistance, scratch resistance, flexibility and durability of the leather coating, while maintaining the soft hand feel and appearance quality of high-end synthetic leather.
Large Mining Machinery Tires & Heavy-Duty Polyurethane Elastomers: Specially suitable for the production of large-scale mining machinery tires, hydraulic seals, mining screen plates, wear-resistant liners, conveyor rollers and other heavy-duty polyurethane elastomer products. Its ultra-long operation window and excellent curing performance ensure uniform molding of large thick-walled products, and the finished products have outstanding wear resistance, tear resistance, impact resistance and long service life, fully adapting to the harsh working conditions of mines, metallurgy and heavy industry.
Other Applicable Fields: Also widely used in precision casting of complex structural parts, rotary casting products, microwave cured polyurethane products, dip-molded parts, industrial rollers, and other polyurethane products, providing a reliable and efficient chain extension and curing solution for various polyurethane molding processes.
