Composite Article Protective Sheet Bonding
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Solution Overview
Problem
Conventional protective coatings and sheets for composite materials, such as gel coats, often fail to provide adequate abrasion resistance, impact resistance, and durability, leading to interlayer delamination and premature structural failure, while also increasing processing inefficiencies and requiring additional labor and time in manufacturing.
Innovation Solution
A protective sheet comprising elastomeric materials, such as polyurethane-based layers, is applied directly to the composite article, providing enhanced abrasion resistance and impact resistance by being fully integrated and bonded to the surface, eliminating the need for multiple coatings and improving processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional protective coatings (gel coats) are applied to composite articles, then aesthetic enhancement is achieved, but abrasion resistance and impact resistance are insufficient
Solution Approach 1:
The patent combines multiple protective functions (aesthetic enhancement, abrasion resistance, impact resistance) into a single integrated protective coating system. The coating comprises multiple layers including a clearcoat layer with UV absorbers and HALS, and optional pigmented layers, all applied in one manufacturing process to provide comprehensive protection without requiring separate treatments for each function.
Solution Approach 2:
The protective coating uses composite material formulations combining polymeric resins (polyester, vinyl ester, epoxy, or polyurethane) with multiple functional additives including UV absorbers (benzophenones, benzotriazoles), HALS (hindered amine light stabilizers), and pigments. This composite approach creates a coating that simultaneously provides aesthetic enhancement and mechanical protection against abrasion and impact.
2Reliability
If multiple protective coatings are applied to achieve adequate protection, then durability is improved, but processing time and labor increase
Solution Approach 1:
The patent merges multiple protective functions that would traditionally require separate coating applications into a single multi-layer coating system applied in one process. The clearcoat layer with UV protection, abrasion resistance additives, and optional pigmented layers are all applied together, eliminating the need for sequential applications of different specialized coatings.
Solution Approach 2:
The protective coating formulation is designed to be multi-functional, providing UV protection, abrasion resistance, impact resistance, and aesthetic enhancement simultaneously. This universal coating eliminates the need for multiple specialized coatings applied in sequence, thereby improving processing efficiency while maintaining comprehensive durability.
3Ease of manufacture
If conventional protective coatings are applied, then some protection is achieved, but interlayer delamination occurs leading to premature structural failure
Solution Approach 1:
The coating uses composite material formulations with polymeric resins crosslinked through chemical reactions with the composite material surface. The resin system (polyester, vinyl ester, epoxy, or polyurethane) forms strong chemical bonds with the fiber-reinforced composite substrate, preventing interlayer delamination. The formulation includes coupling agents and surface treatments that enhance adhesion stability.
Solution Approach 2:
The patent employs parameter changes in the coating formulation, specifically using resins with controlled molecular weight, crosslink density, and chemical composition. The UV absorbers and HALS are incorporated at specific concentrations to maintain coating integrity and bonding stability under various environmental conditions, preventing delamination while maintaining protection effectiveness.
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 solution enhances the durability and structural integrity of composite articles by providing comprehensive protection against abrasion and impact, while simplifying the manufacturing process by eliminating the need for additional coatings and reducing processing time and labor.
Implementation Method 1
UV absorbers, such as, but not limited to, benzophenones and benzotriazoles
Implementation Method 2
hindered amine light stabilizers ("HALS")
Implementation Method 3
a polymeric resin matrix and fibrous reinforcement together often form the composite
Data Source
Figure 1
AI summary
Methods of the invention include those for applying protective sheets to composite articles. According to these methods and resulting composite articles, a protective sheet is applied to at least a portion of an exterior surface formed from a composite material and where protection is desired. At least one exterior surface of the composite article to be protected can be integrally formed in the presence of the protective sheet. Improved bonding of the protective sheet to the composite article and improved processing efficiency are advantageously achieved according to the invention.