Functional Silane Coating for Plastic Lens Adhesion
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Solution Overview
Problem
Existing coating solutions for plastic lenses face challenges in achieving both adhesiveness and abrasion resistance, particularly when using mixtures of different silane coupling agents, which can lead to reaction control issues and unwanted tinting or other problems.
Innovation Solution
A functional silane compound with hydrolyzable silicon and urea bonds is used, improving compatibility between organic and inorganic compounds, enhancing adhesiveness and allowing for controlled reactions, thereby forming a coating solution that includes this compound and inorganic fine particles for forming a strong, abrasion-resistant film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a mixture of two or more different silane coupling agents is used, then adhesiveness is improved, but reaction control becomes difficult and coating film quality deteriorates
Solution Approach 1:
The patent extracts and eliminates the complex mixture of multiple silane coupling agents, using instead a single carefully designed silane coupling agent with specific molecular structure (含有至少一个硅氧烷键和至少一个尿素键). This extraction approach maintains the adhesiveness benefits while eliminating the reaction control difficulties associated with mixtures.
Solution Approach 2:
The patent changes the molecular structure parameters of the silane coupling agent by incorporating urea bonds alongside siloxane bonds. This structural parameter change enables the single agent to provide both strong adhesion and controlled reactivity, resolving the contradiction between strength and complexity.
2Illumination intensity
If the coating film is made extremely thin to maintain optical performance, then optical clarity is improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent employs composite materials by incorporating inorganic fine particles (such as metal oxide particles) into the organic coating matrix. This composite structure provides both the thin-film optical clarity and the enhanced abrasion resistance, as the inorganic particles reinforce the coating while maintaining transparency.
Solution Approach 2:
The patent applies local quality enhancement by concentrating inorganic fine particles within the coating film to provide localized abrasion resistance where needed, while keeping the overall coating thickness minimal to preserve optical performance. The silane coupling agent specifically enhances the interfacial bonding at particle-matrix boundaries.
3Strength
If a primer layer is added to improve adhesiveness, then bond strength is improved, but coating complexity and manufacturing steps increase
Solution Approach 1:
The patent makes the silane coupling agent multi-functional by designing it to simultaneously provide adhesion promotion, crosslinking, and surface modification capabilities. This universal agent eliminates the need for separate primer layers, maintaining bond strength while reducing coating structure complexity.
Solution Approach 2:
The patent merges the functions of the primer layer and the main coating into a single integrated coating system. The silane coupling agent performs multiple functions that were previously distributed across separate layers, simplifying the overall coating structure while maintaining performance.
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 excellent adhesiveness and abrasion resistance in the coating film, ensuring a strong and durable layer on plastic lenses without the need for a primer layer, while maintaining optical clarity and stability under varying environmental conditions.
Implementation Method 1
The silane-coupling agent mediates chemical binding at a boundary surface between inorganic fine particles and a coated substance
Implementation Method 2
silicon with a hydrolyzable functional group formed at the end of a chain molecule
Data Source
Figure 1
AI summary
A functional silane compound is provided. The functional silane compound realizes a coat film having both adhesiveness and abrasion resistance and allowing a reaction thereof to be easily controlled. The functional silane compound includes silicon with a hydrolysable functional group formed at the end of a chain molecule and one or more urea bonds in the middle of the chain molecule.