Heat-expandable Microspheres with Optimized Polymer Shell
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Solution Overview
Problem
Existing heat-expandable microspheres lack simultaneous high heat resistance and good solvent resistance, failing to maintain expansion performance over time due to insufficient solvent resistance.
Innovation Solution
Heat-expandable microspheres with a thermoplastic resin shell produced by polymerizing a specific polymerizable component containing a nitrile monomer, carboxyl-group-containing monomer, and a monomer with a functional group reactive with the carboxyl group, where the weight fractions and ratios of these components are optimized to achieve high heat and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat-expandable microspheres use a polymer shell with high heat resistance (e.g., nitrile monomer-based polymer), then heat resistance is improved, but solvent resistance deteriorates
Solution Approach 1:
The patent applies composite materials by creating a polymer shell composed of multiple monomer components (nitrile monomer, carboxyl-group-containing monomer, and monomer with reactive functional group) that work together to provide both heat resistance and solvent resistance. This composite polymer structure resolves the contradiction by combining materials with complementary properties rather than relying on a single polymer type.
Solution Approach 2:
The patent employs parameter changes by optimizing the weight ratios of different monomers in the polymer shell and controlling the polymerization conditions to achieve a balanced polymer structure. By adjusting the composition parameters (monomer ratios, molecular weight, crosslinking degree), the shell simultaneously attains high heat resistance and good solvent resistance.
2Ease of manufacture
If heat-expandable microspheres use conventional polymer shells, then manufacturing is simplified, but expansion performance deteriorates over time due to solvent resistance issues
Solution Approach 1:
The patent applies preliminary action by pre-forming the polymer shell with optimized composition and structure before encapsulating the blowing agent. The shell is prepared in advance with the correct monomer ratios and crosslinking to ensure long-term stability, preventing degradation that would affect expansion performance over time.
Solution Approach 2:
The patent uses parameter changes to optimize the polymer shell characteristics (monomer composition, molecular weight, crosslinking density) to achieve both ease of manufacture and long-term expansion performance stability. The specific parameter ranges disclosed enable manufacturers to produce stable microspheres using conventional processes.
3Temperature
If heat-expandable microspheres require high heat resistance for high temperature expansion, then expansion temperature range is improved, but solvent resistance deteriorates
Solution Approach 1:
The patent resolves this contradiction by using a composite polymer shell combining nitrile monomer (providing heat resistance for high-temperature expansion) with carboxyl-group-containing monomer and monomer having reactive functional groups (providing solvent resistance). The synergistic combination enables both high expansion temperature range and good solvent resistance.
Solution Approach 2:
The patent applies local quality by assigning different functional roles to different monomer components within the polymer shell. The nitrile monomer component provides heat resistance for high-temperature stability, while the carboxyl-group-containing and reactive functional group monomers provide solvent resistance, with each component optimized for its specific function.
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 exhibit high heat resistance and good solvent resistance, maintaining expansion performance and preventing encapsulated blowing agent loss, even after immersion in solvents.
Implementation Method 1
a thermoplastic resin shell produced by polymerizing a specific polymerizable component containing (A) a nitrile monomer, (B) a carboxyl-group-containing monomer, and (C) a monomer having a functional group reactive with the carboxyl group
Implementation Method 2
a thermally-vaporizable blowing agent encapsulated therein
Implementation Method 3
a monomer having a functional group reactive with the carboxyl group
Data Source
AI summary
Heat-expandable microspheres and applications thereof, the 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 methacrylonitrile, (B) a carboxyl-group-containing monomer and (C) a monomer having a functional group reactive with the carboxyl group. The polymerizable component satisfies the following conditions 1 and 2:Condition 1: The weight fraction of the monomers (A), (B) and (C) in the polymerizable component satisfy the inequality shown below.Weight fraction of the monomer (C)<Weight fraction of the monomer (A)≤Weight fraction of the monomer (B) Inequality (I)Condition 2: The ratio by weight of the monomer (B) to the monomer (C) ranges from 600:1 to 3:1.