Benzoic Acid Acrylic Clearcoat Ambient Curing Etch Resistance
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Solution Overview
Problem
Acrylic urethane clear coats used in the automotive refinish coatings industry often lack sufficient acid etch resistance while curing at ambient temperatures, making them impractical for OEM applications due to softness.
Innovation Solution
Development of curable film-forming compositions comprising a polymeric acrylic binder derived from an ethylenically unsaturated epoxy functional monomer reacted with benzoic acid, combined with a curing agent containing reactive functional groups, which can cure at ambient temperatures and provide enhanced acid etch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If acrylic urethane clear coats are used for ambient temperature curing, then ease of operation is improved, but acid etch resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the acrylic polymer by incorporating specific functional groups (carboxylic acid, hydroxyl, amine, or isocyanate groups) that enable ambient temperature curing while maintaining acid etch resistance. This resolves the contradiction by modifying the chemical parameters of the binder to achieve both ease of operation and resistance to harmful factors simultaneously.
Solution Approach 2:
The patent creates a composite coating system combining the acrylic polymer binder with metal oxide particles (such as zinc oxide, titanium oxide, or silicon oxide) to achieve both ambient temperature curing capability and enhanced acid etch resistance. The composite formulation allows the coating to cure easily at ambient temperatures while the metal oxide components provide the necessary resistance to acid etching.
2Object-affected harmful factors
If acrylic coatings are designed for etch resistance in OEM applications, then acid etch resistance is improved, but strength deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the acrylic polymer by incorporating reactive functional groups that enable crosslinking at ambient temperatures. This creates a stronger molecular network structure that provides both acid etch resistance and adequate strength, eliminating the need for high-temperature curing while preventing coating softness.
Solution Approach 2:
The patent formulates a composite coating system where metal oxide particles (zinc oxide, titanium oxide, silicon oxide) are incorporated into the acrylic polymer matrix. This composite structure provides enhanced acid etch resistance while the crosslinking mechanism maintains coating strength and prevents softness, resolving the contradiction between etch resistance and strength.
3Ease of manufacture
If traditional acrylic coatings are used, then ease of manufacture is improved, but reliability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the acrylic polymer binder to include specific functional groups (carboxylic acid, hydroxyl, amine, or isocyanate) that provide both ease of manufacture through ambient temperature curing and reliable acid etch resistance. This formulation approach maintains manufacturing simplicity while achieving the required reliability performance.
Solution Approach 2:
The patent develops a composite coating formulation combining acrylic polymer with metal oxide particles (zinc oxide, titanium oxide, silicon oxide). This composite approach maintains ease of manufacture through simple mixing and ambient temperature application while providing reliable acid etch resistance, resolving the contradiction between manufacturing simplicity and performance reliability.
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 solution achieves excellent acid etch resistance and maintains other physical properties, demonstrating improved durability and performance compared to traditional coatings.
Implementation Method 1
a polymeric acrylic binder having reactive functional groups, wherein the polymeric acrylic binder is prepared from an ethylenically unsaturated, epoxy functional monomer that is reacted with benzoic acid; and a curing agent containing functional groups that are reactive with reactive functional groups on the polymeric acrylic binder
Data Source
AI summary
The present invention is directed to curable film-forming compositions comprising: (a) a polymeric acrylic binder having reactive functional groups, wherein the polymeric acrylic binder is prepared from an ethylenically unsaturated, epoxy functional monomer that is reacted with benzoic acid; and (b) a curing agent containing functional groups that are reactive with reactive functional groups on the polymeric acrylic binder. Also provided is a multilayer coated substrate comprising: a substrate; a colored basecoat applied to at least a portion of a surface of the substrate; and a clearcoat applied to at least a portion of the basecoat, wherein the clearcoat is deposited from the curable film-forming composition described above.