Self-Healing Coating Sheet With Abrasion and Contamination Resistance
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Solution Overview
Problem
Conventional coating layers with self-healing properties lack sufficient mechanical properties, abrasion resistance, and contamination resistance, particularly when applied to automotive exterior materials, leading to potential permanent damage and loss of self-healing function under strong external stimuli.
Innovation Solution
A sheet comprising a coating layer made of a cured acrylate graft polyester-based polyol copolymer and a base layer, which includes a silicone-acrylate graft resin for improved contamination resistance and a thermally-cured product with polyisocyanate for enhanced self-healing and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coating layer with self-healing function is applied to protect the product surface, then the self-healing property is improved, but the mechanical properties (hardness, abrasion resistance, strength) and contamination resistance deteriorate
Solution Approach 1:
The patent uses a composite coating structure with multiple layers: a base coating layer containing self-healing agents (microencapsulated healing agents or shape memory polymers) and a top protective coating layer with enhanced mechanical properties and contamination resistance. This composite structure allows the self-healing function to be preserved in the base layer while the top layer provides the necessary mechanical strength and resistance to contamination.
Solution Approach 2:
The patent applies different material compositions and properties to different regions of the coating system. The base coating layer is designed with self-healing functionality, while the top protective layer is formulated with high hardness, abrasion resistance, and contamination resistance. This local differentiation allows each layer to optimize its specific function without compromising the overall system performance.
2Strength
If the conventional coating layer with self-healing is made thicker to improve mechanical properties, then the mechanical strength is improved, but the contamination resistance and aesthetic appearance deteriorate
Solution Approach 1:
The patent employs a multi-layer composite coating where a thin top protective layer provides contamination resistance and aesthetic appearance, while the thicker base layer contains self-healing agents and provides mechanical strength. This composite approach allows achieving high mechanical strength without increasing the thickness of the visible top layer.
Solution Approach 2:
The patent concentrates the self-healing functionality and mechanical strength requirements in the base layer, while the top layer is optimized for contamination resistance and aesthetics. This local quality differentiation allows the top layer to remain thin and aesthetically pleasing while the base layer provides the necessary mechanical strength.
3Strength
If the coating layer is made harder to improve abrasion resistance, then the abrasion resistance is improved, but the self-healing function is lost under strong external stimuli
Solution Approach 1:
The patent creates a composite system where the top protective layer provides abrasion resistance through high hardness materials, while the base layer maintains self-healing functionality. The layered structure ensures that the hard top layer protects against abrasion while the softer, more flexible base layer can still undergo the deformation and recovery necessary for self-healing under strong external stimuli.
Solution Approach 2:
The patent localizes the hardness and abrasion resistance properties to the top protective layer, while the base layer maintains its self-healing properties with appropriate flexibility. This local quality assignment allows the top layer to resist abrasion while the base layer can still respond to strong external stimuli for self-healing.
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 sheet achieves excellent self-healing, contamination resistance, and chipping resistance, making it suitable for automotive exterior materials by controlling crosslinking density, hardness, and thickness to balance mechanical properties and aesthetic requirements.
Implementation Method 1
a coating layer containing a cured product of acrylate graft polyester-based polyol copolymer... and a thermally-cured product with polyisocyanate for enhanced self-healing and mechanical properties
Implementation Method 2
a thermally-cured product with polyisocyanate for enhanced self-healing and mechanical properties
Data Source
Figure 1~2
AI summary
A sheet includes a coating layer containing a cured product of acrylate graft polyester-based polyol copolymer; and a base layer.