Heat-Expandable Microspheres Shell Crosslinking for Pressure Resistance
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Solution Overview
Problem
Heat-expandable microspheres with shells that are durable against external forces during processing fail to maintain mechanical strength after expansion, leading to deformation or rupture under high pressure loads, which limits their ability to effectively lighten base materials.
Innovation Solution
Development of heat-expandable microspheres with a thermoplastic resin shell containing a polymerizable component comprising a cross-linkable monomer with at least two (meth)acryloyl groups and a reactive carbon-carbon double bond, which provides a rigid and elastic shell structure that resists deformation under high pressure loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat-expandable microspheres are made with a thick shell to resist external forces during processing, then durability during processing is improved, but the shell becomes too thick after expansion causing deformation under high pressure loads
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and cross-linking degree of the shell material. The shell is made from a polymer with a cross-linking degree of 60-90 wt% composed of specific monomers (acrylonitrile, methacrylonitrile, and other (meth)acrylonitrile compounds), which fundamentally changes the mechanical properties to achieve both durability and post-expansion strength
Solution Approach 2:
The patent uses composite materials by creating a highly cross-linked polymer network from multiple monomer components. The combination of acrylonitrile (30-70 wt%), methacrylonitrile (5-65 wt%), and other (meth)acrylonitrile compounds (5-30 wt%) forms a composite shell structure that provides both processing durability and post-expansion mechanical strength
2Weight of moving object
If heat-expandable microspheres are expanded to create hollow resin particles for weight reduction, then the lightweight property is improved, but the shell becomes thinner and more prone to rupture under high pressure loads
Solution Approach 1:
The patent applies parameter changes by controlling the cross-linking degree and monomer composition to maintain shell strength despite thinning. The high cross-linking degree (60-90 wt%) and specific monomer ratios ensure that even when the shell becomes thin after expansion, it retains sufficient strength to resist high pressure loads
Solution Approach 2:
The patent applies local quality by creating a shell with non-uniform properties - the cross-linked polymer structure provides localized reinforcement at critical stress points while maintaining overall thinness for weight reduction. The specific monomer composition creates regions of enhanced strength where needed
3Weight of moving object
If the shell is made thinner to maintain lightweight properties after expansion, then the weight reduction effect is improved, but the shell ruptures or dents under high pressure loads of 20 MPa or higher
Solution Approach 1:
The patent applies parameter changes by adjusting the cross-linking degree to 60-90 wt% and controlling the monomer composition ratios. This creates a shell that is both thin for weight reduction and highly resistant to rupture and denting under high pressure loads of 20 MPa or higher
Solution Approach 2:
The patent uses composite materials by combining multiple (meth)acrylonitrile-based monomers in specific ratios to create a shell with enhanced toughness and rupture resistance. The composite monomer system provides both thin-shell capability and high-pressure resistance
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 hollow resin particles maintain a thin shell structure that resists deformation and retains lightweight properties even under high pressure loads, enabling effective use in materials like automotive paints for weight reduction and design enhancement.
Implementation Method 1
Heat-expandable microspheres (heat-expandable microcapsules) comprising a thermoplastic resin shell and a blowing agent encapsulated therein can be expanded by heating
Implementation Method 2
the thermoplastic resin is a polymer of a polymerizable component containing a cross-linkable monomer (A) having at least two (meth)acryloyl groups per molecule and a reactive carbon-carbon double bond
Data Source
AI summary
Heat-expandable microspheres including a thermoplastic resin shell and a thermally-vaporizable blowing agent encapsulated therein. The thermoplastic resin is a polymer of a polymerizable component containing a cross-linkable monomer (A) which has at least two (meth)acryloyl groups per molecule and a reactive carbon-carbon double bond in addition to the (meth)acryloyl groups and has a molecular weight of at least 500. Also disclosed are hollow resin particles manufactured by expanding the heat-expandable microspheres; fine-particle-coated hollow resin particles including the hollow resin particles; a composition including a base component and the heat-expandable microspheres, or hollow resin particles, or fine-particle coated hollow resin particles; and a formed article manufactured by forming the composition.