Water-based Radiation-curable Soft Feel Coating for Automotive
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Solution Overview
Problem
Current soft feel coatings in automotive applications lack chemical resistance, particularly against sunscreen and insect repellents, and are not sustainable due to the use of volatile organic compounds, necessitating additional primer layers and increased costs.
Innovation Solution
A radiation-curable water-based composition comprising a polyurethane dispersion that eliminates the need for a primer layer, is free from volatile organic compounds, and provides excellent chemical resistance and adhesion, achieved through a reaction of isocyanate groups, polyols, hydrophilic compounds, and ethylenically unsaturated compounds, allowing for quick curing and reduced environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional waterborne soft feel coatings are used, then a soft texture is achieved, but chemical resistance against sunscreen and insect repellents is insufficient
Solution Approach 1:
The patent combines the soft feel properties of waterborne coatings with the chemical resistance of solvent-based coatings by creating a hybrid composition that uses water as the primary carrier but incorporates radiation-curable resins and reactive diluents that provide enhanced chemical stability and adhesion without requiring a separate primer layer
Solution Approach 2:
The invention creates a composite coating system that integrates multiple functional components: polyurethane dispersions for soft feel, acrylic resins for adhesion, radiation-curable resins for chemical resistance, and reactive diluents for crosslinking. This composite approach achieves both soft texture and chemical resistance in a single layer
2Reliability
If solvent-based curable compositions are used to improve chemical resistance, then chemical stability is enhanced, but volatile organic compounds are released and environmental sustainability is reduced
Solution Approach 1:
The patent changes the carrier parameter from organic solvents to water, eliminating VOC emissions. The composition uses water as the primary carrier while incorporating radiation-curable components that cure upon UV or electron beam irradiation, providing chemical resistance without the harmful emissions associated with traditional solvent-based systems
Solution Approach 2:
The invention replaces the chemical drying mechanism of solvent evaporation with a radiation-curing mechanism. Instead of relying on solvent evaporation and oxidative curing, the coating uses photoinitiated or electron beam-initiated polymerization to achieve rapid curing and chemical resistance without VOC emissions
3Reliability
If a primer layer is added to achieve chemical resistance, then chemical stability is improved, but application complexity and cost increase
Solution Approach 1:
The patent merges the functions of the base coat and primer into a single composition. The coating simultaneously provides soft feel properties, adhesion, and chemical resistance through its integrated formulation of polyurethane dispersion, acrylic resin, radiation-curable resin, and reactive diluents, eliminating the need for a separate primer layer
Solution Approach 2:
The invention creates a universal coating composition that performs multiple functions in a single layer: it provides the soft tactile feel of a topcoat, the adhesion properties of a primer, and the chemical resistance typically requiring a dedicated protective layer. This multi-functional formulation simplifies the coating system to a single application
4Reliability
If two-component waterborne compositions are used to improve performance, then chemical resistance is enhanced, but application equipment complexity and cost increase
Solution Approach 1:
The patent combines multiple functional components that would traditionally require separate application steps into a single one-component formulation. The composition integrates polyurethane dispersion, acrylic resin, radiation-curable resin, and reactive diluents in one mixture that can be applied using standard single-component equipment, eliminating the need for complex two-component spray systems
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 offers a cost-efficient, sustainable, and chemically resistant soft feel coating with improved adhesion and reduced curing time, suitable for automotive interiors and other applications, while maintaining a comfortable texture.
Implementation Method 1
The composition comprises a radiation-curable polyurethane water dispersion obtained by reacting: a compound comprising at least two isocyanate groups, a polyol, a compound comprising at least one group capable of reacting with an isocyanate group, and at least one hydrophilic group, and an ethylenically unsaturated compound comprising at least one group capable of reacting with an isocyanate group, and at least one ethylenically unsaturated group
Data Source
AI summary
An aqueous radiation-curable composition comprising a radiation-curable polyurethane dispersion obtained by reacting: a. a compound comprising at least two isocyanate groups, b. a polyol having a molecular weight of at least 500 g/mol, c. a compound comprising at least one group capable of reacting with an isocyanate group, and at least one hydrophilic group, and d. an ethylenically unsaturated compound comprising at least 10 one group capable of reacting with an isocyanate group, and at least one ethylenically unsaturated group, and a plurality of polyurethane particles having a median particle diameter D50 of from 1 to 10 μm, and water.