Water-Based Coating Early Water Resistance Epoxy Silane
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Solution Overview
Problem
Water-based coatings are prone to blistering and wrinkling when exposed to moisture before they are fully cured, leading to poor adhesion and other defects.
Innovation Solution
A water-based coating composition comprising an emulsion of a (meth)acrylic polymer with active hydrogen groups and an epoxy silane oligomer composition, along with titanium oxide and siliceous filler, which provides early water resistance by improving the coating's resistance to blistering and wrinkling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional water-based coatings are exposed to moisture before full curing, then the coating is applied to provide protection, but the coating develops blisters and wrinkles leading to poor adhesion
Solution Approach 1:
The coating composition is formulated with specific polymers and additives that preemptively establish moisture resistance mechanisms before curing is complete. The composition includes water-resistant agents and modified polymers that create a barrier against moisture penetration during the early stages, preventing blistering and wrinkling before they can develop
Solution Approach 2:
The patent modifies the chemical composition parameters of the coating by incorporating specific ratios of acrylic polymers, vinyl acetate, water-resistant agents, and additives. These compositional changes alter the coating's physical properties to achieve early water resistance while maintaining flexibility and adhesion during the curing process
2Reliability
If additives are used to increase curing rate, then early water resistance is improved, but coating flexibility and surface appearance are sacrificed
Solution Approach 1:
The patent carefully balances the compositional parameters to achieve early water resistance without excessive curing rate acceleration. The formulation includes water-resistant agents and modified polymers that provide moisture protection while maintaining the coating's flexibility and surface properties through controlled chemical composition rather than aggressive curing accelerators
Solution Approach 2:
The coating is formulated as a composite system combining acrylic polymers, vinyl acetate, water-resistant agents, and various additives in specific ratios. This composite approach allows the coating to achieve multiple properties simultaneously: early water resistance, flexibility, and good surface appearance, by leveraging the complementary characteristics of each component
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 composition effectively minimizes defects such as blisters and peeling when exposed to water prior to full curing, maintaining the coating's integrity and performance.
Implementation Method 1
an emulsion of a (meth)acrylic polymer containing at least one functional group having an active hydrogen, and an epoxy silane oligomer composition
Implementation Method 2
The addition of an epoxy silane oligomer composition to the emulsion of the (meth)acrylic polymer has been found to improve resistance to blistering and wrinkling when exposed to water shortly after application to a substrate
Data Source
AI summary
A coating composition is shown and described herein. The coating composition comprises: the (meth)acrylic polymer containing at least one active hydrogen (a), the epoxy silane oligomer composition (b), emulsifier (c), titanium oxide particles (d), a siliceous particulate filler (e) and water (f) optionally one or more additives, where the epoxy silane oligomer composition comprises 5 to 15 weight percent monomer, 5 to 20 weight percent dimer, 5 to 20 weight percent trimer and 45-85 weight percent poly-oligomers components. The coating composition can provide a water-based coating composition exhibiting early water resistance such that defects in the coating are minimized if exposed to water prior to the coating being fully cured.