Reactive Hollow Particles for High-Void Resin Reinforcement
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Solution Overview
Problem
Hollow particles with high void ratios suffer from poor pressure resistance and poor adhesion to resin, leading to deterioration in properties such as tensile strength and flexural strength when mixed with resin compositions.
Innovation Solution
Hollow particles with a shell containing a polymer comprising 60-100 parts by mass of crosslinkable monomer units and reactive groups on the surface, such as hydroxy, amino, carboxy, or sulfo groups, enhancing adhesion and pressure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the void ratio of hollow particles is increased, then weight reduction and heat insulation effects are enhanced, but the shell thickness decreases and pressure resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the shell polymer, specifically incorporating crosslinkable monomer units (60-100 parts by mass per 100 parts by mass of total monomer units) and reactive groups (hydroxyl, amino, carboxy, or sulfo groups with specific values). This chemical parameter modification enables the shell to achieve high strength-to-weight ratio, maintaining pressure resistance even when void ratio is 50% or more.
Solution Approach 2:
The shell is constructed as a composite material system combining crosslinkable monomer units with reactive groups that can form crosslinked structures. This composite approach creates a networked polymer structure that provides both lightweight properties (high void ratio) and mechanical strength (pressure resistance), resolving the contradiction between weight reduction and strength maintenance.
2Weight of moving object
If the void ratio of hollow particles is increased, then weight reduction and heat insulation effects are enhanced, but adhesion to resin deteriorates
Solution Approach 1:
The patent modifies the surface chemical parameters by incorporating reactive groups (hydroxyl, amino, carboxy, or sulfo groups) with specific values (hydroxyl value ≥0.20 mmol/g, amine value ≥0.20 mmol/g, or acid value ≥0.20 mmol/g). These parameter changes enable chemical bonding between hollow particles and resin, ensuring reliable adhesion even when void ratio is 50% or more.
Solution Approach 2:
The reactive groups on the hollow particle surface act as chemical intermediaries that facilitate bonding between the hollow particles and the resin matrix. These functional groups form bridging connections, ensuring strong adhesion and preventing deterioration of resin composition properties during molding processes.
3Strength
If crosslinking is performed to improve pressure resistance, then shell strength increases, but adhesion to resin may deteriorate due to reduced reactive groups
Solution Approach 1:
The patent carefully controls the parameter balance between crosslinkable monomer units (60-100 parts by mass per 100 parts by mass of total monomer units) and reactive groups (maintaining hydroxyl value ≥0.20 mmol/g, amine value ≥0.20 mmol/g, or acid value ≥0.20 mmol/g). This parameter optimization ensures sufficient crosslinking for pressure resistance while preserving adequate reactive groups for resin adhesion.
Solution Approach 2:
The patent applies local quality differentiation within the shell structure, where crosslinkable monomer units provide internal crosslinked networks for pressure resistance, while reactive groups are positioned to provide surface functionality for adhesion. This spatial and functional differentiation allows simultaneous achievement of both pressure resistance and adhesion properties.
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 hollow particles maintain a high void ratio while exhibiting excellent pressure resistance and adhesion to resin, preventing deterioration in resin composition properties when molded into a body.
Implementation Method 1
hollow particles having at least one kind of reactive group selected from a hydroxy group and an amino group on a surface thereof... excellent adhesion to resin
Implementation Method 2
the shell contains, as the resin, a polymer in which from 60 parts by mass to 100 parts by mass of a crosslinkable monomer unit is contained in 100 parts by mass of all monomer units... excellent pressure resistance
Data Source
Figure 1
AI summary
Hollow particles which comprise a resin-containing shell and a hollow portion surrounded by the shell, wherein a void ratio is 50% or more; wherein the shell contains, as the resin, a polymer in which 60 to 100 parts by mass of a crosslinkable monomer unit is contained in 100 parts by mass of all monomer units; wherein the hollow particles have at least one kind of reactive group selected from a hydroxy group and an amino group on a surface thereof and the hydroxyl value is 0.20 mmol/g or more or the amine value is 0.20 mmol/g or more, or wherein the hollow particles have at least one kind of reactive group selected from the group consisting of a carboxy group, a carboxylic anhydride group and a sulfo group on a surface thereof and the acid value is 0.20 mmol/g or more.