Heat-Expandable Microspheres with Acrylonitrile Shell
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Solution Overview
Problem
Heat-expandable microspheres typically exhibit poor flowability and insufficient dispersion in resin compositions, limiting their application due to adhesion issues and bridging in hoppers, and they lack high heat resistance and flowability simultaneously.
Innovation Solution
The development of heat-expandable microspheres with a thermoplastic resin shell produced by polymerizing a specific polymerizable component comprising acrylonitrile, methacrylonitrile, and a carboxyl-group-containing monomer, with a controlled composition that ensures high heat resistance and improved flowability, allowing for better dispersion in resin compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If heat-expandable microspheres are used as lightweight fillers, then weight reduction is achieved, but flowability deteriorates due to adhesion and bridging issues
Solution Approach 1:
The invention changes the chemical composition parameters of the thermoplastic shell by incorporating specific monomers (acrylonitrile, methacrylonitrile, and carboxyl-group-containing monomers) in controlled ratios. This composition modification alters the surface properties and interparticle forces of the microspheres, thereby improving flowability while maintaining the lightweight characteristic.
Solution Approach 2:
The invention creates a composite shell structure by copolymerizing multiple monomer types (nitrile monomers and carboxyl-group-containing monomers) to form a thermoplastic resin with optimized properties. This composite material approach enables simultaneous achievement of lightweight property and improved flowability that cannot be obtained with single-component polymers.
2Ease of manufacture
If conventional heat-expandable microspheres are used, then ease of manufacture is improved, but heat resistance deteriorates
Solution Approach 1:
The invention modifies the thermal properties of the microsphere shell by changing the polymer composition parameters. The incorporation of carboxyl-group-containing monomers and specific nitrile monomers in controlled ratios creates a thermoplastic resin with enhanced heat resistance, allowing the microspheres to maintain structural integrity at higher temperatures while remaining manufacturable through conventional polymerization processes.
3Volume of moving object
If heat-expandable microspheres are used in resin compositions, then volume reduction is achieved, but dispersion deteriorates due to adhesion issues
Solution Approach 1:
The invention changes the surface chemical properties of the microspheres by incorporating carboxyl-group-containing monomers into the thermoplastic shell. These functional groups modify the surface energy and interfacial compatibility between the microspheres and resin matrix, thereby improving dispersion stability and reducing adhesion issues while maintaining the volume reduction benefit.
Solution Approach 2:
The invention creates a composite shell material with optimized interfacial properties by copolymerizing nitrile monomers and carboxyl-group-containing monomers. This composite structure provides both the volume reduction characteristic and improved dispersion stability through enhanced interfacial compatibility with resin compositions.
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 resulting microspheres demonstrate high heat resistance, good flowability, and enhanced dispersibility in resin compositions, reducing adhesion and bridging issues, and enabling the production of lightweight, high-strength formed products with improved thermal insulation and sound absorption properties.
Implementation Method 1
a thermoplastic resin shell produced by polymerizing a specific polymerizable component
Implementation Method 2
a thermally-vaporizable blowing agent encapsulated therein
Implementation Method 3
Their heat-expandable property allows them to be used in wide application ranges
Data Source
AI summary
Heat-expandable microspheres including a thermoplastic resin shell and a thermally-vaporizable blowing agent encapsulated therein. The thermoplastic resin is produced by polymerizing a polymerizable component containing (A) a nitrile monomer including acrylonitrile and methacrylonitrile, (B) a carboxyl-group-containing monomer, and (C) a monomer copolymerizable with the nitrile monomer (A) and the carboxyl-group-containing monomer (B). Further, the amount of the acrylonitrile in the nitrile monomer (A) ranges from 0.1 to 9 wt % based on the nitrile monomer (A). Also disclosed are hollow particles manufactured by heating and expanding the heat-expandable microspheres; a composition containing a base compound and at least one particulate material selected from the heat-expandable microspheres and the hollow particles; and a formed product manufactured by molding or applying a coat of the composition.