Non-aqueous Dispersion Stabilizer Epoxy Acrylic Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-aqueous dispersions produced using traditional stabilizers become unstable when polar solvents are added, leading to compatibility issues and defects such as craters in coatings due to large differences in polarity and solubility between the stabilizer and the dispersed polymer.
Innovation Solution
A non-aqueous dispersion comprising the dispersion polymerization reaction product of an ethylenically unsaturated monomer and a nonlinear, random acrylic stabilizer with epoxy functionality, which is compatible with the continuous phase and maintains stability even with changes in solvent polarity, preventing incompatibility and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional steric stabilizers (aliphatic polyester or macromonomer) are used in non-aqueous dispersions, then the dispersion can be prepared by free radical addition polymerization, but the dispersion becomes unstable when polar solvents are added due to large difference in polarity and solubility between stabilizer and dispersed polymer
Solution Approach 1:
The patent changes the chemical structure parameters of the stabilizer by introducing acrylic functional groups and epoxy functionality. This modifies the stabilizer's polarity and solubility characteristics to match the dispersed polymer, thereby maintaining dispersion stability even when polar solvents are added. The stabilizer structure is transformed from non-polar (aliphatic polyester) to polar (acrylic with epoxy groups).
Solution Approach 2:
The patent creates a composite stabilizer system combining acrylic functional groups with epoxy functionality. This composite structure provides both the necessary solubility compatibility with the dispersed polymer and the chemical reactivity needed for stable dispersion. The combination of these functional groups creates a stabilizer that maintains compatibility across different solvent polarities.
2Stability of the object's composition
If traditional steric stabilizers are used, then the dispersed phase can be stabilized during polymerization, but incompatibility occurs when polar solvents are added, leading to defects such as craters in coatings
Solution Approach 1:
The patent modifies the stabilizer's chemical parameters by incorporating acrylic and epoxy functional groups, which change its polarity and intermolecular interaction characteristics. This parameter change allows the stabilizer to remain compatible with both non-polar and polar solvents, preventing the formation of crater defects that occur with traditional stabilizers when polar solvents are present.
Solution Approach 2:
The patent introduces a specially designed stabilizer that acts as an intermediary between the dispersed polymer and the continuous phase solvent. This stabilizer with acrylic and epoxy groups mediates the interaction between phases, maintaining compatibility even when polar solvents are added, thereby preventing coating defects.
3Strength
If aliphatic polyester stabilizers are used, then the steric stabilization can be achieved, but the large difference in polarity between stabilizer and dispersed polymer causes instability with polar solvents
Solution Approach 1:
The patent changes the polarity parameter of the stabilizer by introducing acrylic functional groups and epoxy functionality. This transforms the stabilizer from a non-polar aliphatic polyester to a polar compound that can interact compatibly with both non-polar and polar solvents, thereby achieving both strong steric stabilization and broad solvent compatibility.
Solution Approach 2:
The patent applies local quality by introducing specific functional groups (acrylic and epoxy) at particular locations within the stabilizer molecule. These localized polar groups provide the necessary interactions with the dispersed polymer while the overall stabilizer structure maintains steric stabilization capability, achieving both localization of function and overall performance.
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 use of nonlinear, random acrylic stabilizers with epoxy functionality in non-aqueous dispersions enhances the stability and compatibility of the polymer, resulting in improved adhesion and resistance to solvents, acids, and interlayer mixing, while maintaining flexibility and resistance to blistering and corrosion.
Implementation Method 1
The polymerization is carried out in the presence of a steric stabilizer, a portion of which is soluble in the dispersing medium and a portion of which is associated with the dispersed phase
Implementation Method 2
The steric stabilizer can be physically or chemically bound to the dispersed phase
Data Source
AI summary
A non-aqueous dispersion comprising the dispersion polymerization reaction product of an ethylenically unsaturated monomer and a nonlinear, random acrylic polymer stabilizer wherein the polymerization reaction product comprises epoxy functionality is disclosed. Related coatings, methods, and substrates are also disclosed.