Polymer Foam with Microballoons for Bond Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polymer foams produced with hollow microspheres face challenges such as reduced bond strength, mechanical vulnerability, and limited adaptability to surface conditions due to the reduction in foamed structure, leading to inconsistent thickness and mechanical weaknesses under load.
Innovation Solution
A polymer foam with a specific proportion of cavities enclosed by the foam matrix, comprising 6 to 16% volume of microballoons filled with low-boiling liquids or liquefied gas, which expands to form a stable, closed-cell structure with enhanced bonding strength and resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer foams are produced using hollow microspheres to achieve uniform cell structure and closed-cell configuration, then sealing effect against dust and liquid media is improved, but mechanical vulnerability and reduced bond strength occur under load
Solution Approach 1:
The patent combines hollow glass microspheres with a polymer matrix (polyacrylate, polyurethane, or epoxy) to create a composite foam material. The glass microspheres provide the closed-cell structure for sealing, while the polymer matrix provides mechanical strength and cohesion. This composite approach allows both functions to coexist without compromising either sealing or mechanical performance.
2Adaptability or versatility
If expandable hollow microspheres with thermoplastic polymer shell are used to improve adaptability and cohesive strength, then adaptability to surface conditions and cohesive strength are improved, but thickness consistency deteriorates due to manufacturing tolerances
Solution Approach 1:
The patent specifies precise parameter ranges for the foam composition: 30-70 wt% polymer matrix, 30-70 wt% hollow microspheres, and controlled foam expansion ratios. By controlling these parameters and using non-expandable glass microspheres instead of expandable ones, the invention achieves consistent thickness while maintaining adaptability through the foam's inherent compliance.
3Ease of operation
If foamed adhesive layers are used to achieve micro-rough surfaces for non-destructive removability and repositionability, then repositionability is improved, but bond strength and peel strength are significantly reduced
Solution Approach 1:
The patent creates a composite foam adhesive where the polymer matrix provides strong bonding properties (polyacrylate for adhesion, polyurethane for cohesive strength, or epoxy for high-strength bonding) while the hollow microsphere structure provides the micro-rough surface for repositionability. This composite structure allows simultaneous achievement of strong bond and easy repositioning.
4Adaptability or versatility
If carrier layer is foamed with microballoons to provide adaptability, then adaptability to surface conditions is improved, but thickness uniformity deteriorates due to deviations in average carrier thickness
Solution Approach 1:
The patent allows the foam structure to provide local adaptability through its compressed and expanded cell regions, while the overall thickness is controlled by the rigid polymer matrix framework. The hollow microspheres distribute stress locally without compromising global thickness uniformity, as the matrix maintains structural integrity throughout the layer.
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 higher bonding strength and improved compression hardness, ensuring the foam is more adaptable and resilient, addressing the limitations of previous technologies by maintaining cohesive fracture patterns and adaptability to different surface conditions.
Implementation Method 1
microballoons filled with low-boiling liquids or liquefied gas, which expands to form a stable, closed-cell structure
Implementation Method 2
microballoons filled with low-boiling liquids or liquefied gas
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The aim is to provide a polymer foam with high bond strength and improved compression strength. This is achieved by the polymer foam comprising cavities formed by microballoons as well as 2 to 20 vol.%, based on the total volume of the polymer foam, cavities enclosed by the polymer foam matrix. The application also relates to a method for producing a polymer foam according to the invention.