Microcrystalline Glass Composite Coating for Durable Water and Oil Repellency
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Solution Overview
Problem
Existing methods for achieving water-repellent and oil-repellent coatings on high crystallinity microcrystalline glass surfaces are ineffective due to the lack of Si—O structures at the interface, leading to poor adhesion and durability of the coating.
Innovation Solution
A composite coating layer comprising a water-repellent and oil-repellent layer, an intermediate layer of ionic crystals with specific lattice energy, and a bottom layer containing Si—O bonds or mixed silicon oxide, which forms a strong valence bond with the microcrystalline glass surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a PFPE coating is applied directly to high crystallinity microcrystalline glass surface, then the coating process is simple, but the coating adhesion and durability are poor due to lack of Si-O structures at the interface
Solution Approach 1:
The patent introduces an intermediate layer containing Si-O structures between the PFPE coating and the high crystallinity microcrystalline glass substrate. This intermediate layer acts as a mediator that provides the necessary Si-O groups for chemical bonding with PFPE, while also being compatible with the crystalline glass surface, thereby solving the adhesion problem without complicating the overall coating process
Solution Approach 2:
The patent creates a composite coating structure consisting of multiple layers with different compositions and functions: a bottom layer (the crystalline glass substrate), an intermediate layer (containing Si-O structures for bonding), and a top layer (PFPE for water and oil repellency). This composite structure combines the advantages of each layer to achieve both simple manufacturing and high reliability
2Strength
If the glass crystallinity is increased to improve mechanical properties, then the mechanical strength is improved, but the water-repellent and oil-repellent coating effectiveness deteriorates due to reduced Si-O structures
Solution Approach 1:
The patent applies local quality by creating an intermediate layer with specific Si-O rich composition only at the coating interface where it is needed for bonding, while allowing the bulk glass material to maintain its high crystallinity for mechanical strength. This localized modification ensures coating effectiveness without compromising the overall mechanical properties of the high crystallinity glass
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 achieves a water drop contact angle of over 110° initially and maintains it after 5000 friction cycles, providing a durable and effective water-repellent and oil-repellent coating on high crystallinity microcrystalline glass.
Implementation Method 1
the bottom layer includes compounds containing Si—O bonds or a mixed silicon oxide layer, which forms a strong valence bond with the microcrystalline glass surface
Implementation Method 2
an intermediate layer of ionic crystals with specific lattice energy
Implementation Method 3
improve the capacity of 'water-repellency and oil-repellency' and the hydrophobicity
Implementation Method 4
reduce the active energy on glass surface
Implementation Method 5
achieves a water drop contact angle of over 110° initially and maintains it after 5000 friction cycles
Data Source
AI summary
A microcrystalline glass containing a water-repellent and oil-repellent composite coating layer on the surface, a preparation method and application thereof. The coated glass is a microcrystalline glass or a glass ceramic containing a water-repellent and oil-repellent composite coating layer on the surface, which is characterized in that from the outmost surface of the glass, it includes: a water-repellent and oil-repellent layer, an intermediate layer, a bottom layer and a microcrystalline glass or a glass ceramic, wherein, the intermediate layer is the intermediate layer containing ionic crystals with a lattice energy of 700-3000 kJ/mol and formed by the same, the bottom layer includes compounds containing Si—O bonds or a mixed silicon oxide layer. The present invention can form a firm, durable and excellent water-repellent and oil-repellent coating film even if the coating interface of microcrystalline glass has very few Si—O structure, and can achieve excellent water-repellent and oil-repellent property regardless of whether the high-crystallinity glass has done ion exchange or not.