Polyurea material, as a high-performance protective coating, demonstrates significant advantages in the corrosion protection of hydraulic metal structures due to its exceptional comprehensive properties. It is particularly suitable for the long-term protection of hydraulic gates and embedded parts.

Core Characteristics of Polyurea Material

Polyurea is an elastomeric substance formed by the reaction of an isocyanate component and an amine compound component. Its molecular structure endows it with a series of unique properties suitable for harsh hydraulic environments:

Superior Water Resistance and Impermeability: The coating is dense, continuous, and seamless, possessing extremely high resistance to penetration pressure. It effectively blocks the intrusion of water, water vapor, and other corrosive media, with a theoretically very low water absorption rate.

Excellent Mechanical Properties: It exhibits high tensile strength (typically above 15 MPa) and outstanding elongation at break (up to 400% or more), combining high hardness with flexibility. It can withstand deformation, vibration, and external impact during gate operation, effectively resisting abrasion and impact from sediments, floating ice, and other objects.

Outstanding Corrosion Resistance: It demonstrates excellent resistance to corrosion from freshwater, seawater, salt spray, and common chemicals in aquatic environments, providing long-term protection to metal substrates against electrochemical corrosion.

Superior Durability: The molecular structure is stable, with excellent resistance to UV aging and alternating high and low temperatures. It has a long service life, significantly extending maintenance cycles and reducing lifecycle costs.

Rapid Curing and Construction Adaptability: It reacts quickly, gelling within seconds and reaching walk-on strength in minutes. It can be spray-applied on any curved, sloped, or vertical surfaces without sagging, achieving perfect coverage on complex-shaped gate structures.

Application Positioning in Hydraulic Gate and Embedded Part Protection

Based on the above characteristics, polyurea material is primarily applied in the following key areas and scenarios:

Primary Protective Layer for Gate Leaf Structures: Whether for crest gates or submerged gates, the leaf structures are subjected to long-term water impact, wet-dry cycles, and corrosive media. Spray-applied polyurea coating serves as a long-term anti-corrosion and wear-resistant layer, replacing or upgrading traditional multi-layer paint systems to provide more reliable protection, especially for critical gates operating under harsh conditions.

Long-Term Corrosion Protection for Embedded Parts: Components such as gate slot tracks, sills, reverse rails, and side rails, which are submerged or in humid environments, are extremely difficult to inspect and replace. Applying a polyurea protective layer to these parts effectively resists corrosion and cavitation, ensuring long-term smooth operation of the gates and reducing maintenance needs.

Protection Against Cavitation and Sediment Abrasion: Areas of the gate where high-velocity water flows (e.g., gate panels, gate slot regions) are prone to cavitation damage. In sediment-laden rivers, gates and embedded parts face severe sediment erosion. The high elasticity and wear resistance of polyurea material effectively absorb and dissipate the energy from cavitation collapse and resist sediment abrasion.

Sealing Protection for Structural Cracks and Defects: For surface cracks in concrete gates or concrete structures connected to gates, polyurea coating acts as a flexible sealing and waterproofing layer, preventing water intrusion that could lead to internal reinforcement corrosion and structural deterioration.