Melamine-Formaldehyde Foam Hollow Microsphere Fixation
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Solution Overview
Problem
Melamine-formaldehyde foams incorporating high loadings of hollow microspheres face challenges in maintaining good mechanical properties and effective fixation of these microspheres within the foam structure, often requiring additional production steps and processes.
Innovation Solution
The development of melamine-formaldehyde foams with hollow microspheres having a median particle diameter of 260 μm to 490 μm, which are preferentially embedded into the open-cell pores of the foam structure during production, ensuring better fixation and mechanical properties without additional process steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hollow microspheres with smaller particle diameter (0.5-100 μm or 70-250 μm) are incorporated into melamine-formaldehyde foam, then the foam can achieve functional properties (thermal insulation, scent release, hydrophobicity), but the mechanical properties of the foam are impaired and fixation becomes difficult at high loadings
Solution Approach 1:
The patent applies parameter changes by optimizing the particle diameter of hollow microspheres to a specific range (260-490 μm). This parameter adjustment resolves the contradiction by finding an optimal size that provides sufficient functional properties while maintaining good mechanical properties and fixation at high loadings, avoiding the impairment caused by smaller particles
2Quantity of substance
If high loadings of hollow microspheres are incorporated into the foam, then the functional content (active substances, heat storage media) increases, but the fixation of hollow microspheres becomes difficult and mechanical properties deteriorate
Solution Approach 1:
The patent resolves this contradiction by changing the particle diameter parameter to 260-490 μm, which enables effective fixation of hollow microspheres even at high loadings (5-50% by weight). This size range provides optimal balance between quantity incorporation and fixation quality, preventing the deterioration seen with smaller particles
3Reliability
If hollow microspheres are incorporated into nodal points or struts of foam structure, then functional properties are achieved, but additional process steps are required and fixation difficulty increases with loading
Solution Approach 1:
The patent extracts the requirement for additional impregnation process steps by incorporating hollow microspheres directly into the foam during the foaming operation itself. The optimized particle size (260-490 μm) allows microspheres to be integrated into the foam matrix without requiring separate fixation steps, simplifying the production process while maintaining functional properties
Data Source
AI summary
The present invention relates to melamine-formaldehyde foams comprising hollow microspheres wherein said hollow microspheres have a median particle diameter (D50, volume averaged, Malvern, Fraunhofer diffraction) in the range from 260 μm to 490 μm, and also processes for producing these melamine-formaldehyde foams and their uses.