Electrophoretic Coating Solution Using Olefinic Aldehyde Modification
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Solution Overview
Problem
Existing electrophoretic coating solutions face issues with poor dispersibility of microcapsules in resin and poor adhesion, leading to agglomeration, appearance defects, and low yield in electrophoretic display panels.
Innovation Solution
An electrophoretic coating solution comprising microcapsules modified with an olefinic aldehyde compound, a resin monomer, and a solvent, where the olefinic aldehyde compound forms a firm molecular structure through aldehyde-amine condensation, enhancing dispersibility and adhesion, and preventing cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcapsules are used in electrophoretic coating solution, then electrophoretic display function is achieved, but poor dispersibility leads to agglomeration and precipitation
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that chemically bonds to both the microcapsule surface and the resin matrix. This coupling agent acts as a bridge, improving the interfacial compatibility and dispersibility of microcapsules in the coating solution, thereby preventing agglomeration and precipitation while maintaining the electrophoretic display function.
Solution Approach 2:
The patent modifies the surface properties of microcapsules by treating them with silane coupling agents, changing their surface chemistry parameters. This treatment alters the surface energy and chemical composition of microcapsules, enabling better compatibility with the resin matrix and improving overall dispersibility and stability in the coating solution.
2Manufacturing precision
If microcapsules are dispersed in resin, then electrophoretic coating is formed, but poor adhesion leads to cracking
Solution Approach 1:
The silane coupling agent serves as a mediator between the microcapsule surface and the adhesive resin. It forms strong chemical bonds with both materials, creating a robust interface that prevents cracking and improves the overall strength and durability of the electrophoretic coating layer.
Solution Approach 2:
The patent creates a composite material system where silane-modified microcapsules are integrated with the resin matrix and adhesive. This composite structure combines the electrophoretic properties of microcapsules with the mechanical strength and adhesion of the resin-silane system, resulting in a coating that is both functional and mechanically robust.
3Ease of manufacture
If conventional electrophoretic coating solution is used, then coating can be applied, but appearance defects occur due to agglomeration
Solution Approach 1:
The patent applies preliminary surface treatment to microcapsules using silane coupling agents before forming the final coating. This pre-treatment ensures that microcapsules are pre-dispersed and stabilized in the resin matrix, preventing agglomeration during the coating application process and ensuring a defect-free appearance.
Solution Approach 2:
The silane coupling agent acts as an intermediary that facilitates uniform distribution of microcapsules throughout the coating solution. By improving interfacial compatibility, it prevents agglomeration and ensures a homogeneous coating structure, eliminating appearance defects while maintaining ease of manufacture.
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 improves the uniform dispersion of microcapsules, reduces appearance defects, and enhances the bonding strength between the microcapsules and adhesive, resulting in improved yield and optical performance of electrophoretic display panels.
Implementation Method 1
the olefinic aldehyde compound, a firm molecular structure is formed through aldehyde-amine condensation and addition reaction of two reactive sites of an aldehyde group and a double bond in the olefinic aldehyde compound with gelatin in a capsule wall of the microcapsule and resin monomer or unsaturated resin respectively
Implementation Method 2
addition reaction of two reactive sites of an aldehyde group and a double bond in the olefinic aldehyde compound with gelatin in a capsule wall of the microcapsule
Data Source
AI summary
Provided is an electrophoretic coating solution, comprising 100 parts by weight of microcapsules modified with an olefinic aldehyde compound; 1 to 20 parts by weight of a resin monomer and/or an unsaturated resin; and 50 to 100 parts by weight of a solvent. Also provided are an electrophoretic display panel and a display device. In this solution, the electrophoretic coating solution has good dispersibility, and the yield of the electrophoretic display panel is improved.