Surface Treatment Composition for Organic Substrate Adhesion
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Solution Overview
Problem
The adhesion between coatings and organic substrates, such as polymethyl methacrylate (PMMA), is poor due to molecular property mismatches, leading to reduced durability and permanence of the coating.
Innovation Solution
A surface treatment composition comprising a first solvent with a dipole moment ≥10×10−30 C·m, a second solvent with a dipole moment between 5×10−30 and 10×10−30 C·m and a boiling point of 50 to 150 degrees Celsius, and an acrylic monomer is applied to the organic substrate to create a rough surface morphology, enhancing coating adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating is directly applied on the surface of PMMA substrate, then the coating can be formed, but the adhesion between the coating and the PMMA substrate is poor due to molecular structure mismatch and internal stress
Solution Approach 1:
The patent applies a surface treatment composition containing specific solvents and acrylic monomer to the PMMA substrate before coating application. This preliminary treatment modifies the substrate surface properties, creating a rougher surface morphology that enhances mechanical interlocking and improves adhesion between the subsequent coating and the substrate.
Solution Approach 2:
The patent changes the surface parameters of the PMMA substrate by treating it with a composition containing solvents with specific dipole moments (first solvent: ≥10×10−30 C·m, second solvent: 5-10×10−30 C·m) and acrylic monomer. This treatment modifies surface energy, polarity, and roughness, making the surface more compatible with high-functionality coating components and reducing internal stress.
2Strength
If the coating contains high molecular functionality components, then the coating performance is improved, but large internal stress is generated on the PMMA surface resulting in poor adhesion
Solution Approach 1:
The surface treatment composition acts as an intermediary layer between the PMMA substrate and the high-functionality coating. The acrylic monomer and solvents in the treatment composition create a transition zone that reduces the molecular property mismatch, allowing high-functionality coating components to bond effectively to the substrate without generating excessive internal stress.
Solution Approach 2:
The treatment composition modifies the substrate surface parameters (polarity, surface energy, roughness) to better match the coating components. This parameter adjustment reduces the stress generated by high-functionality coating materials, enabling them to maintain their performance benefits while achieving good adhesion.
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 surface treatment composition increases the contact area between the coating and the organic substrate, forming a mechanical interlocking effect that significantly enhances adhesion, thereby improving the durability and permanence of the coating.
Implementation Method 1
The first solvent and the acrylic monomer in the surface treatment composition for the organic substrate are utilized to erode a surface of the organic substrate to form a rough structure
Implementation Method 2
The second solvent in the surface treatment composition for the organic substrate is utilized to regulate the morphology of the rough structure... has a relatively low boiling point, which facilitates drying and rapid removal
Implementation Method 3
a rough structure... increasing a contact area of a subsequently formed coating. Moreover, a concave-convex fitting between the surface of the organic substrate and the coating forms a mechanical interlocking
Data Source
AI summary
Disclosed are a surface treatment composition for an organic substrate, an optical assembly, and a display panel. The surface treatment composition for the organic substrate includes a first solvent having a dipole moment greater than or equal to 10×10−30 C·m, a second solvent having a dipole moment greater than 5×10−30 and less than 10×10−30 C·m and a boiling point of 50 to 150 degrees Celsius, and an acrylic monomer.