Polyurethane Coated Bead Foam for Smooth Surfaces
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Solution Overview
Problem
Polyurethane bead foams used in various applications face challenges with surface roughness, limited colorability, and poor mechanical properties, particularly in visible components, due to shrinkage and low density, which hinder their use in applications requiring smooth, robust, and colorable surfaces.
Innovation Solution
Coated shaped articles comprising foamed beads of polyurethane (A) with a coating of polyurethane (B), where both polyurethanes share at least 50 wt % of their polyol and polyisocyanate components, ensuring excellent adherence and allowing for smooth, robust, and multicolored surfaces with improved mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If polyurethane bead foams are used for low-density applications, then weight reduction is achieved, but surface roughness and poor mechanical properties occur
Solution Approach 1:
The patent creates a composite structure by coating polyurethane bead foam with a polyurethane coating layer. The bead foam provides low density while the coating layer provides smooth surface and enhanced mechanical properties, resolving the contradiction between weight reduction and strength requirements
Solution Approach 2:
The invention applies different properties to different parts of the product: the inner bead foam structure maintains low density for weight reduction, while the outer coating layer provides smooth surface finish and improved mechanical properties where needed, allowing local optimization of contradictory requirements
2Weight of moving object
If polyurethane bead foams are used for visible components, then weight reduction is achieved, but surface roughness and soiling occur
Solution Approach 1:
The patent combines bead foam with a polyurethane coating layer to create a composite structure where the coating provides a smooth, robust surface that resists soiling while the foam core maintains low density, suitable for visible automotive components
Solution Approach 2:
The invention applies smooth surface properties locally to the outer surface through coating, while maintaining the low-density foam structure internally, allowing visible surfaces to resist soiling without sacrificing weight advantages
3Weight of moving object
If polyurethane bead foams are used for colorable surfaces, then weight reduction is achieved, but poor colorability occurs
Solution Approach 1:
The patent creates a composite where the polyurethane coating layer serves as a suitable substrate for coloration processes, enabling intensive hues and multicolor surfaces while the bead foam core maintains low density for weight reduction
Solution Approach 2:
The invention concentrates colorability properties in the outer coating layer where they are needed for visible surfaces, while the inner foam structure maintains low density, allowing different functional properties in different regions
4Strength
If polyurethane bead foams are used for mechanical strength, then structural integrity is achieved, but surface roughness occurs
Solution Approach 1:
The patent creates a composite structure where the polyurethane coating layer provides a smooth surface finish while the bead foam structure provides mechanical strength, allowing both requirements to be met simultaneously in different parts of the 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 coated articles achieve a smooth, robust, and colorable surface with enhanced mechanical properties, including abrasion resistance and glossy finishes, while maintaining the bead structure, addressing the limitations of pure bead foams.
Implementation Method 1
not less than 50 wt % of the polyol component used for constructing polyurethane (A) and polyurethane (B) is identical and not less than 50 wt % of the at least one polyisocyanate component used for constructing polyurethane (A) and polyurethane (B) is identical
Data Source
AI summary
Coated shaped articles contain at least one shaped article with foamed beads containing at least one polyurethane (A) and at least one coating containing at least one polyurethane (B), wherein polyurethane (A) and polyurethane (B) are each constructed from at least one polyol and at least one polyisocyanate and wherein not less than 50 wt % of the polyol component used for constructing polyurethane (A) and polyurethane (B) is identical and not less than 50 wt % of the at least one polyisocyanate component used for constructing polyurethane (A) and polyurethane (B) is identical. Processes for producing the coated shaped articles and the method of using the coated shaped articles for various applications can be utilized.