(Meth)acrylic-Modified Siloxane Compound for Paint Leveling and Defoaming
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Solution Overview
Problem
Existing active energy ray-curable paints lack additives that simultaneously provide excellent leveling and defoaming properties without bleeding over time, and additives without reactive groups can cause bleeding issues.
Innovation Solution
A (meth)acrylic-modified siloxane compound with a specific structure is used as an additive, which imparts excellent leveling and defoaming properties to paints and prevents bleeding, featuring a combination of reactive groups for active energy ray curability and a balanced composition to ensure compatibility and reactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional additives are used to improve leveling property, then leveling performance is enhanced, but defoaming property deteriorates
Solution Approach 1:
The siloxane compound is designed to perform multiple functions simultaneously: it provides both leveling property (improving surface smoothness) and defoaming property (reducing bubbles), eliminating the need to choose between conflicting performance characteristics
Solution Approach 2:
The additive combines siloxane backbone structure with specific side chains containing reactive groups, creating a composite molecular structure that integrates the low surface tension of siloxanes with the curability of active energy ray-reactive groups, achieving both leveling and defoaming effects
2Manufacturing precision
If additives without reactive groups are used, then leveling property is improved, but bleeding occurs over time
Solution Approach 1:
The additive incorporates reactive groups that undergo chemical transformation upon active energy ray irradiation, changing the molecular state from unreacted to crosslinked, which prevents bleeding while maintaining leveling performance
Solution Approach 2:
The patent replaces physical stabilization (relying on molecular weight and structure alone) with chemical stabilization through photo-induced crosslinking, where the reactive groups form covalent bonds that permanently fix the additive in place
3Reliability
If active energy ray-curable components are added, then curability is improved, but compatibility and reactivity balance deteriorates
Solution Approach 1:
The siloxane compound features localized reactive groups attached to a siloxane backbone, where the bulk of the molecule maintains siloxane characteristics (low surface tension, defoaming ability) while specific local regions provide curability through reactive groups
Solution Approach 2:
The additive undergoes parameter change from unreacted state to crosslinked state upon active energy ray irradiation, transforming the molecular configuration to achieve curability while maintaining compatibility with other paint components through the siloxane backbone
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 (meth)acrylic-modified siloxane compound effectively enhances the leveling and defoaming properties of paints, preventing bleeding and providing an antifouling effect when used as a topcoat agent, while maintaining compatibility with other paint components.
Implementation Method 1
active energy ray-curable paints have been increasingly used... good, active energy ray curability
Data Source
AI summary
The present, invention aims to provide an additive which has a reactive group with good active energy ray curability. When incorporated in a paint, the additive does not bleed over time and imparts an excellent leveling property and a defoaming property to the paint.There is provided a (meth)acrylic-modified siloxane compound of formula (a1) which has, as a branch and, optionally, at one or both of the terminals, of a linear polysiloxane backbone, a specific number of moieties having a (meth)acryloyl group at a terminal and a (poly)oxyalkylene structure of the formula —(CaH2aO)b—. Also provided is an additive for paints, comprising said (meth)acrylic-modified siloxane compound.