Functionalized Graphene Wiper Blade Coating for Low Friction Adhesion
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Solution Overview
Problem
Conventional wiper blade coatings with graphite or non-oxidized graphene suffer from low adhesiveness to rubber, leading to reduced durability and performance, as well as high frictional forces that cause noise and vibration during operation.
Innovation Solution
A coating composition using functionalized graphene with specific functional groups for self-adhesion to the rubber base, allowing for improved dispersibility and adhesion without the need for binders, thereby enhancing wiping performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If graphite or non-oxidized graphene is used as lubricant additive in coating composition, then the coefficient of friction is reduced, but adhesiveness to rubber base deteriorates
Solution Approach 1:
The patent applies parameter changes by oxidizing graphene to introduce oxygen-containing functional groups (carboxyl, hydroxyl, epoxy groups) on the graphene surface. This chemical modification changes the surface properties of graphene, enabling it to form strong chemical bonds with rubber base while maintaining its lubricating characteristics, thus resolving the contradiction between low friction and good adhesion
Solution Approach 2:
The patent creates a composite coating system where oxidized graphene serves as both lubricant additive and bonding agent. The composite structure combines the lubricating properties of graphene with the adhesive properties of oxygen-containing functional groups, achieving simultaneous improvement in friction reduction and adhesion to rubber base
2Reliability
If binder amount is increased to improve adhesiveness, then adhesion improves, but lubricant additive ratio is reduced
Solution Approach 1:
The oxidized graphene serves a dual function: it acts as both the lubricant additive and the bonding agent. The oxygen-containing functional groups on graphene surface provide self-adhesion capability to rubber base, eliminating the need for separate binders. This self-service approach maintains high lubricant additive ratio while achieving excellent adhesion
3Force
If surface treatment by halogenation is applied to reduce friction, then coefficient of friction is reduced, but adhesion to windshield deteriorates over time
Solution Approach 1:
The patent uses oxidation instead of halogenation to modify the rubber base surface. Oxidation introduces oxygen-containing functional groups that provide sustained adhesion capability without the curing problems associated with halogenation. This parameter change in chemical treatment method resolves the issue of adhesion deterioration over time while maintaining friction reduction
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 functionalized graphene coating achieves high adhesion and durable wiping performance by minimizing binder usage and optimizing the coefficient of friction, resulting in reduced noise and vibration during wiper operation.
Implementation Method 1
functionalized graphene having enhanced adhesiveness to rubber
Implementation Method 2
functionalized graphene capable of self-adhesion to the wiper blade rubber base
Implementation Method 3
the formed coating layer functions as a lubricant layer which reduces the coefficient of friction on glass
Data Source
AI summary
The present invention relates to a coating composition which is for a wiper blade and is for forming a coating layer for lowering the coefficient of friction of a wiper blade rubber base on glass, the coating composition including a lubricant additive and a solvent, wherein the lubricant additive is functionalized graphene capable of self-adhesion to the wiper blade rubber base.