Polyurethane Waterslide Coating for Abrasion-Resistant Repair
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Solution Overview
Problem
Existing waterslide coatings, such as gelcoat and wax, suffer from low abrasion resistance, leading to rapid surface roughening, increased friction, and frequent maintenance needs, which is labor-intensive, costly, and poses safety risks due to spalling and exposure of underlying structures.
Innovation Solution
A water-based two-component polyurethane resin (2K-PUR) with high abrasion resistance is applied in thin layers, using a less abrasive substrate preparation method, to provide a durable and easily maintainable coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If regular waxing is performed to maintain the gel coat surface, then the surface smoothness is temporarily improved, but the maintenance frequency increases and labor costs rise
Solution Approach 1:
The patent applies a thin sacrificial polymer layer (5-50 μm) that is designed to wear away gradually during normal use. This layer acts as a protective barrier that can be easily reapplied when worn, replacing the need for frequent waxing. The layer is intentionally consumable, absorbing the abrasive wear from water flow and sliding surfaces, thereby maintaining the underlying gel coat in good condition for extended periods.
Solution Approach 2:
The patent uses a composite coating system consisting of the existing gel coat layer combined with an additional polymer-based protective layer. This composite structure provides enhanced abrasion resistance compared to the gel coat alone. The polymer layer can be based on polyurethane, acrylic, or other suitable polymers, creating a multi-layer composite that combines the structural integrity of the gel coat with the surface protection properties of the polymer coating.
2Manufacturing precision
If the gel coat layer is renewed by removing and reapplying thick layers, then the surface quality is restored, but the risk of detachment and cutting injuries increases
Solution Approach 1:
The patent fundamentally changes the parameter of layer thickness from the conventional thick application (several hundred micrometers) to a thin application (5-50 micrometers). This parameter change reduces the mechanical stress and adhesion requirements on the bonding interface. The thin layer is less prone to detachment because it flexes more readily with substrate movement and requires less adhesive strength to maintain integrity, thereby eliminating the hazard of large coating sections detaching and creating cutting risks.
3Strength
If thick gel coat layers are applied to ensure adequate protection, then the abrasion resistance is improved, but the adhesion to the substrate becomes more difficult and detachment risk increases
Solution Approach 1:
The patent changes the thickness parameter to an optimal range (5-50 μm) that balances protection and adhesion. This thin layer provides sufficient abrasion resistance for maintaining surface quality while remaining flexible enough to adhere reliably to the gel coat substrate. The reduced thickness eliminates the adhesion problems associated with thick coatings, which are prone to cracking and detachment due to internal stresses and substrate movement.
Solution Approach 2:
The patent employs a thin film approach where the polymer coating (5-50 μm) acts as a flexible protective shell rather than a rigid thick layer. This thin film structure can accommodate substrate flexing and thermal expansion without developing excessive internal stresses that would lead to adhesion failure. The flexibility of the thin polymer layer allows it to maintain intimate contact with the substrate, ensuring reliable adhesion while providing the necessary surface protection.
4Strength
If the gel coat is sanded heavily to prepare the surface for renewal, then the bond strength is improved, but more material is removed than necessary and the tube structure is damaged
Solution Approach 1:
The patent applies preliminary surface preparation actions (light cleaning, light abrasion, or chemical etching) that are sufficient to ensure adequate adhesion for the thin polymer layer without the need for heavy sanding. Since the required layer thickness is only 5-50 μm, minimal surface preparation is needed to create adequate mechanical interlocking. This preliminary action removes contaminants and provides slight surface roughness for bonding, achieving sufficient adhesion strength while preserving the majority of the existing gel coat and underlying tube structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The 2K-PUR coating extends the service life of waterslides, reduces maintenance frequency, minimizes safety hazards, and lowers energy consumption by maintaining a smooth surface with reduced friction.
Implementation Method 1
The sliding surface of a waterslide is subjected to abrasive wear by sliding and especially by the flowing water
Implementation Method 2
The polyurethane resin is water-dilutable, highly cross-linked and resistant to solvents when fully cured
Implementation Method 3
The accumulations and soiling increase the frictional resistance, which reduces the sliding speed
Data Source
AI summary
The present invention relates to the use of a water-based two-component polyurethane resin that is applied to a waterslide at a thickness of at least 3 μm, but less that 100 μm as a first-time application to new waterslides and for maintaining and repairing existing waterslides.