Aqueous composition for surface coating and automotive sheet using the composition
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Solution Overview
Problem
Conventional automotive sheet coatings fail to provide adequate antifouling properties and stain resistance, leading to indoor air quality issues and friction noise, while also generating odorous volatile organic compounds (VOCs) due to the use of organic solvents.
Innovation Solution
An aqueous composition for surface coating is developed, comprising a main ingredient with multiple functional groups and a curing agent with aziridine, isocyanate, or carbodiimide groups, forming a three-dimensional crosslinking polymer network with an aqueous solvent, which includes a prepolymer with a urethane or siloxane backbone, and optional additives like silicone beads and fluorine-containing waxes, to create an interpenetrating polymer network with improved stain resistance and slip performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional organic solvent-based coatings are used, then coating performance is achieved, but volatile organic compounds (VOCs) are generated causing odorous emissions and indoor air quality issues
Solution Approach 1:
The patent changes the fundamental parameter of the solvent system from organic solvents to water-based solvents. The aqueous composition uses water as the primary solvent, fundamentally altering the chemical composition to eliminate VOC emissions while maintaining coating functionality through careful selection of water-soluble or water-dispersible polymers and curing agents
Solution Approach 2:
The patent employs readily available, non-toxic water as the solvent medium, replacing expensive and hazardous organic solvents. This substitution uses a simple, abundant substance (water) that can be easily disposed of without environmental harm, aligning with the principle of using cheap, short-living objects
2Reliability
If conventional coatings are used, then basic surface protection is provided, but antifouling properties and stain resistance are insufficient
Solution Approach 1:
The patent creates a composite coating system combining multiple functional components: water-soluble polymers for base coating, crosslinking agents for enhanced durability, and specific additives for antifouling properties. This composite approach integrates multiple materials with complementary functions to achieve superior stain resistance and antifouling performance
Solution Approach 2:
The patent applies different functional components to specific aspects of the coating: hydrophobic additives are concentrated at the surface to provide stain resistance, while crosslinking agents are distributed throughout the matrix to provide mechanical strength and chemical resistance, creating local quality variations for optimized performance
3Object-affected harmful factors
If conventional coatings are used, then surface coating is achieved, but friction noise occurs in automotive applications
Solution Approach 1:
The patent modifies the surface friction parameter by incorporating lubricious additives and adjusting the polymer composition to create a low-friction surface. The aqueous-based formulation inherently provides different surface rheology compared to organic coatings, reducing coefficient of friction and thereby minimizing squeak and noise in automotive door panels
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 significantly enhances antifouling properties, reduces VOC emissions, and minimizes friction noise, achieving excellent stain resistance and improved indoor air quality in automotive applications.
Implementation Method 1
The main ingredient and the curing agent may form a polymer chain by a three-dimensional cross-linking reaction
Implementation Method 2
The polymer chain and a curing agent that does not participate in the three-dimensional crosslinking reaction may form an interpenetrating polymer network
Data Source
AI summary
Disclosed is an aqueous composition for surface coating, including: a main ingredient comprising a first compound having at least two functional groups selected from the group consisting of a carboxyl group, a hydroxyl group, an amino group and combinations thereof, per molecule; a curing agent comprising a second compound having at least two functional groups selected from the group consisting of an aziridine group, an isocyanate group, a carbodiimide group and combinations thereof, per molecule; and an aqueous solvent. Further, an automotive sheet using the aqueous composition for surface coating is disclosed.