Scratch-Resistant Hydrophobic Structured Surface
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Solution Overview
Problem
Existing structured surfaces with micro- and nano-scale elements lack sufficient mechanical stability and scratch resistance, particularly when subjected to mechanical stress, which compromises their hydrophobic properties.
Innovation Solution
A structured surface comprising a polymeric material with micro- and nano-scale elements, specifically designed to maintain hydrophobicity and mechanical stability, achieved through a UV-curable precursor composition and replication method that ensures high scratch resistance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro- and nano-structured surfaces are created to enhance water repellence and self-cleaning properties, then hydrophobicity is improved, but mechanical stability and scratch resistance deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the material composition parameters - using a polymeric material with specific elongation at break (≥10%), tensile strength (≥5 MPa), and permanent set (<2%). These parameter specifications transform the material properties to simultaneously achieve both hydrophobicity and mechanical stability, resolving the contradiction between surface structure functionality and mechanical durability.
Solution Approach 2:
The patent employs composite materials by combining the polymeric material with specific mechanical properties into a structured surface composition. This composite approach integrates the hydrophobic surface structure with a mechanically robust polymer matrix, enabling the surface to maintain both water repellence and scratch resistance that neither component could achieve alone.
2Ease of operation
If structured surfaces are subjected to mechanical stress during cleaning, then cleaning effectiveness is improved, but surface elements are polished and mechanical stability deteriorates
Solution Approach 1:
The patent applies beforehand cushioning by pre-engineering the polymeric material with high elongation at break (≥10%) and low permanent set (<2%). These pre-established mechanical properties cushion the surface elements against damage during cleaning operations, allowing effective cleaning while preventing the polishing and degradation that would otherwise occur.
Solution Approach 2:
The patent uses parameter changes by specifying critical mechanical parameters of the polymeric material - elongation at break ≥10%, tensile strength ≥5 MPa, and permanent set <2%. These parameter modifications enable the surface to withstand cleaning mechanical stresses without compromising structural integrity, resolving the contradiction between cleaning effectiveness and surface stability.
3Ease of manufacture
If conventional polymeric materials are used for structured surfaces, then ease of manufacture is improved, but scratch resistance and durability worsen
Solution Approach 1:
The patent applies parameter changes by redefining the material selection criteria - choosing polymeric materials with specific mechanical parameters (elongation at break ≥10%, tensile strength ≥5 MPa, permanent set <2%). This parameter-based approach maintains ease of manufacture through conventional polymer processing while dramatically improving scratch resistance and durability compared to conventional materials.
Solution Approach 2:
The patent applies local quality by focusing on the specific mechanical properties of the polymeric material at the surface level. Rather than changing the entire material system, it optimizes the local quality of the polymer - selecting materials with specific elongation, strength, and elasticity characteristics that provide scratch resistance while maintaining manufacturability through standard polymer processing techniques.
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 provides a surface that remains unchanged after 10 rubbing cycles and maintains a static contact angle of at least 90°, demonstrating enhanced mechanical stability and hydrophobicity, making it suitable for applications requiring durability and easy cleaning.
Implementation Method 1
radiation curing the precursor
Implementation Method 2
UV-or electron beam curable precursor
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~4b
AI summary
The present invention relates to a scratch-resistant micro- and/or nanostructured surface comprising a plurality of micro-scale and/or nano-scale surface elements, said surface being essentially unchanged when being subjected to 10 rubbing cycles according to A.A.T.C.C. test method 8-1972 using a cotton cloth and a total stamp weight of 300 g, and comprising a polymeric material having 1) an elongation at break of at least 10%, 2) an irreversible relative plastic deformation (permanent set) of less than 2% and a 3) a tensile strength of at least 5 MPa. The present invention furthermore relates to a hydrophobic micro- and/or nanostructured surface comprising a plurality of micro-scale and/or nano-scale surface elements and having a static contact angle against water of at least 90, said surface comprising a polymeric material having 1) an elongation at break of at least 10%, 2) an irreversible relative plastic deformation (permanent set) of less than 2% and a 3) a tensile strength of at least 5 MPa.