Polyurea–Polysilazane Protective Film for Flexible Scratch Resistance
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Solution Overview
Problem
Existing protective films for optical articles fail to provide simultaneous impact resistance, scratch resistance, and flexibility, with inorganic materials cracking under folding and organic materials lacking sufficient scratch resistance.
Innovation Solution
A protective film comprising a substrate with a film portion made of aliphatic polyurea and polysilazane, optionally with shock absorbing layers, where the polyurea is formed through a urea bond of aliphatic polyisocyanate and polyamine, and polysilazane is formed via polymerization of perhydropolysilazane, achieving a weight ratio of 7:3 to 9:1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic materials are used for protective films, then scratch resistance is improved, but impact resistance deteriorates and flexibility is lost due to cracking during folding
Solution Approach 1:
The patent employs a composite protective film comprising an inorganic layer (such as silicon oxide, silicon nitride, or diamond-like carbon) combined with an organic layer (such as polyurethane or polycarbonate). This composite structure allows the inorganic layer to provide scratch resistance while the organic layer provides impact resistance and flexibility, thereby resolving the contradiction between scratch resistance and reliability.
2Reliability
If organic materials are used for protective films, then flexibility and impact resistance are improved, but scratch resistance deteriorates
Solution Approach 1:
The patent employs a composite protective film comprising an inorganic layer (such as silicon oxide, silicon nitride, or diamond-like carbon) combined with an organic layer (such as polyurethane or polycarbonate). This composite structure allows the organic layer to provide flexibility and impact resistance while the inorganic layer provides scratch resistance, thereby resolving the contradiction between reliability and scratch resistance.
3Strength
If protective films are made thicker to improve impact resistance, then scratch resistance is improved, but flexibility deteriorates
Solution Approach 1:
The patent employs a composite protective film with multiple layers of different materials and thicknesses. By optimizing the thickness and material composition of each layer, the film achieves sufficient impact resistance without excessive thickness, thereby maintaining flexibility. The inorganic layer provides hardness and scratch resistance with minimal thickness, while the organic layer provides impact absorption and flexibility.
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 film offers enhanced impact resistance, scratch resistance, and flexibility, maintaining high visible light transmittance and preventing yellowing or whitening from UV exposure, with improved performance and longevity.
Implementation Method 1
the aliphatic polyurea is a polymer prepared through a urea bond of aliphatic polyisocyanate and aliphatic polyamine
Implementation Method 2
the polysilazane may be formed through a polymerization reaction of perhydropolysilazane
Data Source
AI summary
Provided are a protective film and an optical article. More particularly, provided is a protective film including a substrate including a first surface and a second surface facing each other, and a first film portion disposed on the first surface, wherein the first film portion includes aliphatic polyurea and polysilazane, and the aliphatic polyurea is a polymer prepared through a urea bond of aliphatic polyisocyanate and aliphatic polyamine.