Water-Repellent Laminate with Organosilicon Intermediate Layer
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Solution Overview
Problem
Laminates with water-repellent layers lack sufficient abrasion resistance, which compromises their water-repellency over time.
Innovation Solution
A laminate structure comprising a substrate with an anti-reflection layer, an intermediate layer of cured or vapor-deposited organosilicon compounds containing silicon atoms and amino groups, and a water-repellent layer with perfluoropolyether structures bound to silicon atoms through linking groups, ensuring excellent abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-repellent layer is formed on a substrate, then water-repellency is achieved, but abrasion resistance deteriorates
Solution Approach 1:
The coating system is divided into three distinct layers: a primer layer containing silane compound applied first, followed by a hard coat layer, and finally the water-repellent surface layer containing fluorine-based compound. This segmentation allows each layer to perform its specific function - the primer provides adhesion, the hard coat provides mechanical strength and abrasion resistance, and the surface layer provides water-repellency, thereby resolving the contradiction between water-repellency and abrasion resistance
Solution Approach 2:
The invention uses a composite structure combining organic and inorganic materials across multiple layers. The primer layer uses silane compounds that form inorganic-organic hybrid networks, the hard coat layer uses durable organic polymers, and the surface layer uses fluorinated compounds. This composite material approach allows the system to simultaneously achieve adhesion, mechanical strength, and water-repellency, resolving the contradiction between soft water-repellent coating and hard abrasion-resistant properties
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 laminate exhibits enhanced abrasion resistance, maintaining water-repellency even after extensive use, with a water sliding angle of not more than 50° and a coefficient of kinetic friction of not more than 0.40 after a 20,000-cycle abrasion test.
Implementation Method 1
the intermediate layer (c) is a cured layer of a mixture composition (cc) of an organosilicon compound (C), or a vapor deposition layer of the organosilicon compound (C)
Implementation Method 2
the intermediate layer (c) is a cured layer of a mixture composition (cc) of an organosilicon compound (C)
Data Source
AI summary
An object of the present invention is to provide a laminate which has a substrate, an intermediate layer, and a water-repellent layer laminated in this order, and has excellent abrasion resistance. The present invention is a laminate comprising: a substrate (s) having an anti-reflection layer; an intermediate layer (c) placed on the anti-reflection layer side of the substrate; and a water-repellent layer (r), in this order, wherein the intermediate layer (c) is a cured layer of a mixture composition (cc) of an organosilicon compound (C), or a vapor deposition layer of the organosilicon compound (C), the organosilicon compound (C) contains a silicon atom together with an amino group and/or an amine skeleton, the water-repellent layer (r) is a cured layer of a mixture composition (ca) of an organosilicon compound (A) in which a monovalent group having a perfluoropolyether structure is bound to a silicon atom through a linking group or without a linking group located therebetween, and a hydrolyzable group is bound to the silicon atom through a linking group or without a linking group located therebetween, and the laminate satisfies the following requirement (1),(1) a water sliding angle is not larger than 50° after a abrasion resistance test in which a 200 g load per 1.5 cm×1.5 cm area is applied to a surface on the water-repellent layer (r) side of the laminate and the surface is rubbed 20,000 times.