Active Energy Ray Curable Resin Composition Scratch Resistance
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Solution Overview
Problem
Existing active energy ray-curable resin compositions with silicone or fluorine compounds have poor compatibility with polyol components, resulting in cured products with inadequate scratch resistance.
Innovation Solution
A resin composition comprising a monofunctional ethylenically unsaturated monomer, a polyfunctional ethylenically unsaturated monomer, a urethane group-containing ethylenically unsaturated monomer, a photopolymerization initiator, a polymerization inhibitor, and a surfactant, with specific weight ratios and surface tension adjustments to enhance scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone compound or fluorine compound is added to resin composition curable by ultraviolet light, then curability and transparency are improved, but scratch resistance deteriorates due to poor compatibility with polyol component
Solution Approach 1:
The patent introduces a specific monofunctional ethylenically unsaturated monomer (A) as an intermediary component that mediates between the silicone/fluorine compound and the polyol component. This monomer acts as a compatibility agent that enables the silicone or fluorine compound to coexist with the polyol component without phase separation, thereby maintaining both curability and scratch resistance in the cured product.
Solution Approach 2:
The patent creates a composite resin composition system combining multiple components with specific functions: monofunctional ethylenically unsaturated monomer (A), polyfunctional ethylenically unsaturated monomer (B), urethane group-containing ethylenically unsaturated monomer (C), silicone compound or fluorine compound, and photopolymerization initiator. This composite approach allows each component to contribute its strengths while minimizing weaknesses, achieving both transparency and scratch resistance.
2Shape
If silicone compound or fluorine compound is added to resin composition curable by ultraviolet light, then transparency is improved, but scratch resistance deteriorates due to poor compatibility with polyol component
Solution Approach 1:
The monofunctional ethylenically unsaturated monomer (A) serves as a mediator that ensures uniform distribution and compatibility of the silicone or fluorine compound within the polyol-based resin matrix. This prevents phase separation that would compromise both transparency and scratch resistance, allowing the cured film to maintain optical clarity while achieving the required surface hardness.
Solution Approach 2:
The patent optimizes the content ratios of each component, specifically controlling the amount of monofunctional ethylenically unsaturated monomer (A) at 5-50 mass%, silicone compound or fluorine compound at 5-50 mass%, and polyfunctional ethylenically unsaturated monomer (B) at 5-50 mass%. These parameter adjustments ensure proper compatibility and network formation, achieving both transparency and scratch resistance.
3Strength
If polyol component is used in resin composition curable by ultraviolet light, then mechanical properties are improved, but compatibility with silicone compound or fluorine compound is poor, resulting in reduced scratch resistance
Solution Approach 1:
The monofunctional ethylenically unsaturated monomer (A) acts as a bridge between the polar polyol component and the less compatible silicone or fluorine compound. This intermediary monomer has molecular structure characteristics that allow it to interact favorably with both types of compounds, ensuring homogeneous mixing and stable composition throughout the cured product.
Solution Approach 2:
The patent creates local compatibility zones where the monofunctional ethylenically unsaturated monomer (A) concentrates around the silicone or fluorine compound particles, forming stable micro-environments. This local quality adjustment allows the polyol component to maintain its mechanical property-enhancing function while the silicone or fluorine compound maintains its transparency and scratch resistance 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 composition achieves excellent scratch resistance and mechanical properties in the cured product, with improved surface free energy and contact angle characteristics.
Implementation Method 1
an active energy ray-curable resin composition containing: (A) a monofunctional ethylenically unsaturated monomer free of urethane groups; (B) a polyfunctional ethylenically unsaturated monomer free of urethane groups; (C) a urethane group-containing ethylenically unsaturated monomer; (D) a photopolymerization initiator
Data Source
AI summary
The present invention provides an active energy ray-curable resin composition containing: (A) a monofunctional ethylenically unsaturated monomer free of urethane groups; (B) a polyfunctional ethylenically unsaturated monomer free of urethane groups; (C) a urethane group-containing ethylenically unsaturated monomer; (D) a photopolymerization initiator; (E) a polymerization inhibitor; and (F) a surfactant, wherein relative to the total weight of (A), (B), (C), (D), (E), and (F), the weight ratio of (A) is 45 to 90% by weight, the weight ratio of (B) is 3 to 25% by weight, the weight ratio of (C) is 3 to 35% by weight, the weight ratio of (D) is 0.1 to 10% by weight, the weight ratio of (E) is 0.01 to 5% by weight, and the weight ratio of (F) is 0.1 to 10% by weight, and the resin composition has a surface tension of 20 to 30 mN/m.