Epoxy Polysiloxane Coatings Weatherability Chemical Resistance

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Solution Overview

Problem

Epoxy resins tend to chalk when exposed to weathering conditions, compromising their chemical resistance and durability in coating applications.

Innovation Solution

A resin composition comprising a blend of epoxy polysiloxane resin, epoxyfluorosilicone resin, and fluorinated or non-fluorinated silane-modified polyacrylic resin, combined with a curing agent such as aminosilane, to create a coating with enhanced weatherability and chemical resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If epoxy resins are used for coating, then chemical resistance is improved, but weatherability deteriorates due to chalking

Engineering Contradiction:

Improvechemical resistanceVSAvoidweatherability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies composite materials by combining epoxy polysiloxane resin with fluorinated or non-fluorinated silane-modified polyacrylic resin. This creates a hybrid coating system that integrates the chemical resistance of epoxy resins with the weatherability and UV stability of polysiloxane and polyacrylic components, thereby resolving the contradiction between chemical resistance and weatherability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters by incorporating fluorinated or non-fluorinated silane-modified polyacrylic resin into the epoxy polysiloxane system. This parameter change alters the coating's molecular structure to achieve both excellent chemical resistance and improved weatherability, preventing the chalking issue while maintaining chemical protection.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of stationary object

If polysiloxanes are used for coating, then weatherability is improved, but mechanical properties deteriorate

Engineering Contradiction:

ImproveweatherabilityVSAvoidmechanical properties

Core Design Contradiction:

Duration of action of stationary objectVSStrength

Solution Approach 1:

The patent uses composite materials by blending polysiloxane-based epoxy resin with polyacrylic resin. This combination leverages the excellent weatherability and UV resistance of polysiloxanes while the polyacrylic component contributes superior mechanical properties such as flexibility, adhesion, and impact resistance, thus resolving the contradiction between weatherability and mechanical strength.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent merges two different polymer systems—epoxy polysiloxane and silane-modified polyacrylic resin—into a single hybrid coating formulation. This merging allows the coating to simultaneously exhibit the weatherability advantages of polysiloxanes and the mechanical properties of polyacrylic resins, achieving both durability and strength.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If fluoropolysiloxanes are used for coating, then temperature stability and chemical resistance are improved, but mechanical properties deteriorate

Engineering Contradiction:

Improvetemperature stabilityVSAvoidmechanical properties

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies composite materials by combining fluorinated silane-modified polyacrylic resin with epoxy polysiloxane resin. The fluorinated polyacrylic component provides enhanced temperature stability and chemical resistance, while the polysiloxane and polyacrylic matrix maintain good mechanical properties, thus resolving the contradiction between thermal/chemical stability and mechanical strength.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the compositional parameters by incorporating fluorinated groups into the silane-modified polyacrylic resin structure. This parameter modification enhances temperature stability and chemical resistance while the overall hybrid system formulation maintains acceptable mechanical properties through the synergistic combination of resin components.

Inventive Principle:

Principle #35Parameter changes

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 coating composition exhibits improved weatherability, chemical resistance, and abrasion resistance, maintaining high gloss and mechanical strength even under prolonged weather exposure.

Implementation Method 1

a silane-modified polyacrylic resin having a gel fraction of 5-70%, wherein the silane-modified polyacrylic resin is a condensation product of a polyacrylic resin and an organofunctional silane

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 2

coating compositions comprising (a) a blend of epoxy polysiloxanes, optionally epoxy-functional fluorosilicones... and fluorinated and/or non-fluorinated silane-modified polyacrylic resins and (b) a curing agent, selected from the group consisting of aminosilane, aminoalkyl silane, aminosilanes having two or three silicon atoms, and aminosilanes with one or more amine groups

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Data Source

PatentEP3741809B1Epoxy polysiloxane resin compositions for coatings

Publication Date: 2022.03.09 SWIMC LLC

AI summary

The present invention is directed to a resin composition, comprising: (1) an epoxy polysiloxane resin; and (2) a fluorinated silane-modified polyacrylic resin. Further, the invention is directed to a resin composition, comprising: (1) an epoxy polysiloxane resin; and (2) a silane-modified polyacrylic resin.