Vehicle Intermediate Coating Chipping Resistance via Cellulose Nanofibers
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Solution Overview
Problem
Current paint compositions for vehicle intermediate coating lack sufficient chipping resistance against impacts from stones and other road debris, leading to damage due to their thickness and material vulnerability.
Innovation Solution
A paint composition comprising a specific blend of polyester resin, melamine resin, cellulose nanofibers, dispersant, surface conditioner, antisagging agent, and solvent, with optimized weight percentages, including titanium dioxide and calcium carbonate, to enhance chipping resistance and film toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the intermediate coating layer is made thinner to reduce weight, then the vehicle's overall weight decreases, but the chipping resistance deteriorates
Solution Approach 1:
The patent applies composite materials by incorporating cellulose nanofibers (CNFs) into the intermediate coating layer formulation. The CNFs are mixed with polyester resin and melamine resin to create a composite paint composition that provides enhanced mechanical strength and chipping resistance at reduced thickness, thereby resolving the contradiction between weight reduction and strength maintenance
2Strength
If the intermediate coating layer thickness is increased to improve chipping resistance, then the ability to resist stone impacts improves, but the vehicle's overall weight increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the coating material by incorporating cellulose nanofibers with specific dimensions (width of 10-100 nm, length of 1-5 μm) and optimizing the resin composition ratios. This allows achieving superior chipping resistance at thinner film thickness, thereby reducing vehicle weight while maintaining or improving protective performance
3Ease of manufacture
If conventional paint composition is used, then the manufacturing process is simple, but the chipping resistance is insufficient against high-speed stone collisions
Solution Approach 1:
The patent modifies the chemical composition parameters of the paint by incorporating cellulose nanofibers and adjusting the ratio of polyester resin (15-20 wt%) to melamine resin (7-13 wt%). These parameter changes enhance chipping resistance while maintaining compatibility with conventional manufacturing processes, thus resolving the contradiction between manufacturing simplicity and improved performance
Data Source
AI summary
A paint composition for vehicle intermediate coating including a polyester resin, a melamine resin, a color pigment, an extender pigment, cellulose nanofibers (CNFs), a dispersant, a surface conditioner, an antisagging agent, and a solvent. The extender pigment may include calcium carbonate (CaCO3). The paint composition can impart improved chipping resistance to a paint film.