Modified Nano-Silica Crosslinking for Pigment Dispersion Stability
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Solution Overview
Problem
Conventional methods for preparing nano-silica particles fail to prevent agglomeration and crosslinking with polymeric materials, leading to instability and poor film-forming properties in pigment dispersions, especially when particle sizes decrease below 100 nm.
Innovation Solution
Modified nano-silica particles with unsaturated double bonds on their surface, prepared by reacting tetraethyl orthosilicate with a silane coupling agent containing a vinyl group, are used to create a crosslinking network with polymeric materials, preventing agglomeration and enhancing dispersion stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the primary particle size of pigment is decreased to less than 50 nm, then the dispersion stability should be improved, but the surface energy increases causing pigment particles to agglomerate
Solution Approach 1:
The patent introduces modified nano-silica particles as an intermediary substance between pigment particles and the binder resin. These particles have hydrophilic surfaces that interact with pigment particles and hydrophobic grafted chains that interact with the organic binder resin, effectively mediating the interface and preventing agglomeration of ultrafine pigment particles
Solution Approach 2:
The patent creates a composite system consisting of pigment particles, modified nano-silica particles, and binder resin. The modified nano-silica acts as a composite additive that combines the functions of dispersant and rheology modifier, forming a stable composite structure that prevents pigment aggregation
2Strength
If conventional nano-silica particles are added to pigment paste, then the viscosity should be increased, but they cannot crosslink with polymeric materials to form network structure
Solution Approach 1:
The patent modifies the chemical parameters of nano-silica by grafting organic chains containing unsaturated double bonds onto the silica surface. This parameter change transforms the inert silica surface into a reactive surface that can participate in crosslinking reactions with polymeric materials through the unsaturated bonds
Solution Approach 2:
The patent applies local quality modification by maintaining the hydrophilic silica core for dispersion stability while grafting hydrophobic unsaturated chains on the surface for crosslinking reactivity. This creates particles with different functional regions that simultaneously provide steric hindrance and crosslinking capability
3Ease of manufacture
If the resin film is formed by conventional pigment dispersion, then the coating should be applied, but the film shrinks during post-baking causing dents and side wall shrinkage
Solution Approach 1:
The patent performs preliminary action by forming a crosslinked network structure within the resin matrix before the final film formation and baking processes. This pre-established network provides structural framework that resists shrinkage forces during subsequent heating and drying operations
Solution Approach 2:
The modified nano-silica particles act as cushioning elements distributed throughout the resin matrix before baking. These particles provide steric hindrance and the crosslinked network provides structural support that cushions against the shrinkage stresses that occur during post-baking, preventing dents and deformation
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 modified nano-silica particles effectively prevent agglomeration and improve film-forming properties, reducing shrinkage and enhancing heat, chemical, and mechanical resistance of the film while maintaining transparency and gloss.
Implementation Method 1
the modified nano-silica particles according to the present invention have unsaturated double bonds on the surface thereof, they can crosslink with other polymeric materials
Implementation Method 2
the binder resin functions to increase the viscosity, provide steric hindrance effect among the pigment particles and effectively prevent the occurrence of agglomeration
Implementation Method 3
they will be separated by the steric hindrance effect of the binder resin covered on the surface of the pigment after they are added to the pigment paste and evenly dispersed
Data Source
AI summary
The invention relates to the field of materials technology and provides a modified nano-silica and a method for preparing the same, a pigment dispersion and a photosensitive resin composition, so as to solve the problem that conventional nano-silica cannot crosslink with other polymeric materials, and pigment dispersions are apt to aggregate and have a poor film-forming property. The modified nano-silica according to the invention has unsaturated double bonds on the surface thereof and can crosslink with other polymeric materials, such that the pigment dispersion comprising the modified nano-silica can effectively prevent agglomeration and has a good film-forming property, and the photosensitive resin composition comprising the pigment dispersion can reduce the thermal expansion of a film made thereby, as well as the occurrence of shrinkage and collapse phenomena in the surface of the film, and enhance the heat-resistance, chemical-resistance, mechanical properties and abrasion-resistance of the film.