Isocyanate, a core raw material for polyurethane synthesis, has long suffered from poor storage stability and complex construction due to the high reactivity of -NCO groups, which easily react with water, hydroxyl groups, etc. The latent curing agent blocking technology shields -NCO activity through chemical modification, achieving the breakthrough of "stable storage at room temperature and reaction under specific conditions" and bringing new opportunities to related industries.
    Classified by activation method, the technology includes moisture-activated and heat-activated types. The former undergoes hydrolysis to deblock when exposed to water, while the latter requires reverse reaction triggered by a specific temperature, adapting to different application scenarios. Some latent curing agents with built-in hydroxyl groups also have both blocking and crosslinking enhancement functions, further optimizing system stability. Currently, the technology has been widely applied in one-component coatings, water-based polyurethanes, powder coatings, adhesives and other fields, forming high-quality products with high hardness and excellent weather resistance in automotive, home appliance, aerospace and other industries. It not only simplifies the construction process but also meets environmental protection and high-performance requirements, promoting the continuous expansion of polyurethane material application scenarios.

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