Photocurable Coating Composition Low Viscosity Abrasion Resistance
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Solution Overview
Problem
Existing photocurable coating compositions struggle to achieve a balance between low viscosity and excellent abrasion resistance, especially in solvent-free formulations, which are also transparent and suitable for coating methods like spray coating and flow coating.
Innovation Solution
A photocurable composition is developed that includes surface-modified inorganic particles, a difunctional (meth)acrylate, a trifunctional (meth)acrylate, and a photoradical initiator, formulated to have a low viscosity while maintaining excellent transparency and abrasion resistance, with a solvent content less than 10 wt%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of high-viscosity multifunctional (meth)acrylic compound is included to achieve excellent atmospheric curability and abrasion resistance, then the curability and abrasion resistance improve, but the viscosity of the coating composition increases considerably
Solution Approach 1:
The invention changes the chemical structure parameters of the acrylic compound by introducing a cyclic structure with specific ring sizes (3-8 membered rings). This structural modification allows the compound to maintain high functionality (2-6 functional groups) while achieving lower viscosity compared to conventional linear multifunctional acrylic compounds, thus resolving the contradiction between curability/abrasion resistance and viscosity.
Solution Approach 2:
The invention uses a composite molecular structure combining cyclic frameworks with acrylic functional groups. This composite approach creates a unique compound type that differs from both conventional linear acrylics and cyclic carbonates, achieving a balance between high reactivity (for good curability and abrasion resistance) and low viscosity (for easy application).
2Reliability
If organic solvents are added to improve the dispersibility and abrasion resistance of inorganic particles, then the abrasion resistance improves, but the composition becomes high-viscosity in solvent-free state
Solution Approach 1:
The invention extracts and eliminates organic solvents from the coating composition by using a solvent-free formulation. The cyclic multifunctional acrylic compound serves as both the binder and the dispersion medium, allowing inorganic particles to be dispersed without requiring additional solvents, thus achieving low viscosity in the solvent-free state while maintaining abrasion resistance.
Solution Approach 2:
The cyclic multifunctional acrylic compound performs multiple functions simultaneously: it acts as the polymer matrix, the dispersing medium, and the reactive component for crosslinking. This multi-functionality eliminates the need for separate solvent components, achieving solvent-free formulation with low viscosity and good particle dispersibility.
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 low viscosity, ensuring compatibility with coating methods like spray and flow coating, while providing excellent transparency and abrasion resistance, making it suitable for environmentally friendly and high-performance applications.
Implementation Method 1
a photocurable composition which includes: surface-modified inorganic particles, a difunctional (meth)acrylate, a trifunctional (meth)acrylate, and a photoradical initiator
Data Source
AI summary
Provided is a photocurable composition comprising (A) surface-modified inorganic particles in which 1 to 30 parts by mass of at least one of an organosilicon compound represented by formula (1) and a hydrolysis product and a condensation product thereof is chemically bound to 100 parts by mass of inorganic particles and which have a median diameter of 1 to 60 nm in a volume-based particle size distribution, (B) a bifunctional (meth)acrylate, (C) a trifunctional (meth)acrylate and (D) a photoradical initiator, in which the blend amount of the component (A) is 10 to 35% by mass, and the total blend amount of the components (A), (B) and (C) is 70% by mass or more. (In the formula, R1 represents a hydrogen atom or the like; R2 represents an alkylene group; R3 represents an alkyl group or the like; R4 represents an alkoxy group or the like; and n represents an integer of 1 to 3.)