3D Porous Superhydrophobic Coating for Complex Shapes
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Solution Overview
Problem
Existing superhydrophobic coatings suffer from poor durability and cohesion, limiting their industrial application due to issues like peeling and reduced hydrophobicity, and are restricted to spray coating methods, which cannot coat complex shapes.
Innovation Solution
A three-dimensional porous nanocomposite structure is developed using inorganic hydrophobic nanoparticles and hydrophobic polymer nanomicrospheres, allowing for dip or roll coating and enhancing durability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spray coating is used to obtain superhydrophobic coating, then good hydrophobicity and durability can be achieved, but the coating cannot be applied to complex shapes and coiled materials
Solution Approach 1:
The patent changes the coating application method from spray coating to dip coating by adjusting the coating process parameters and substrate processing方式. This allows the superhydrophobic coating to be applied to complex shapes and coiled materials while maintaining good hydrophobicity and durability through controlled immersion and drying processes
Solution Approach 2:
The patent develops a universal coating formulation and process that can be applied to various substrate shapes and configurations through dip coating. The coating system achieves multi-functionality by accommodating both simple and complex geometries, coiled materials, and different substrate types while maintaining consistent superhydrophobic performance
2Strength
If polymer resin is used as binder to wrap hydrophobic nanoparticles, then coating adhesion is improved, but hydrophobicity is reduced and durability is poor
Solution Approach 1:
The patent changes the binder type from conventional polymer resin to inorganic oxide nanoparticles (such as silica, alumina, or titania). This parameter change eliminates the wrapping effect that reduces hydrophobicity, while the inorganic binder provides sufficient adhesion through surface treatment and chemical bonding, maintaining both hydrophobicity and durability
Solution Approach 2:
The patent creates a composite coating system combining inorganic hydrophobic nanoparticles with inorganic oxide binder nanoparticles. This composite structure avoids the harmful wrapping effect of organic resins while providing both adhesion and hydrophobicity through the synergistic interaction of inorganic components, improving overall durability
3Duration of action of stationary object
If coating thickness is increased to improve durability, then coating protection is enhanced, but coating cohesion and peeling resistance are not fundamentally improved
Solution Approach 1:
The patent changes the fundamental parameters of the coating system by using inorganic oxide nanoparticles as both binder and filling material, and by optimizing the nanoparticle size distribution and surface treatment. This allows achieving excellent durability and cohesion at appropriate thickness levels without relying on excessive thickness, as the inorganic composite structure provides inherent strength and adhesion
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 new coating achieves improved durability up to 160%, suitable for complex shapes, with better adhesion and uniform nanostructure, facilitating large-scale production and expanded application fields.
Implementation Method 1
the inorganic hydrophobic nanoparticles and the hydrophobic polymer nanomicrospheres are interconnected to form uniform pores
Implementation Method 2
the positively charged polymer nanoparticles were mixed with the negatively charged silica nanoparticles, and a raspberry structure was constructed by means of electrostatic self-assembly
Implementation Method 3
spraying a silane coupling agent as a hydrophobic agent on the surface of the hydrophobic coating
Data Source
AI summary
A superhydrophobic coating having a three-dimensional porous nanocomposite structure, includes: a constructing unit and a bonding unit; the constructing unit comprises inorganic hydrophobic nanoparticles, the bonding unit comprises hydrophobic polymer nanomicrospheres, and the inorganic hydrophobic nanoparticles and the hydrophobic polymer nanomicrospheres are interconnected to form uniform pores. A method for preparation of the superhydrophobic coating includes: mixing the inorganic hydrophobic nanoparticles with the hydrophobic polymer nanomicrospheres in a dispersant to form a coating solution; and coating the coating solution on the surface of a substrate using a dip coating, roll coating or spray coating process, and drying to form the superhydrophobic coating of a three-dimensional porous nanocomposite structure.