Heat-Expandable Microsphere Production via Polyester Amide Stabilization
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Solution Overview
Problem
Existing processes for producing heat-expandable microspheres with a mean particle size ranging from 0.01 to 10 μm face challenges in achieving constant and high-yield production without deteriorating their expansion performance, often resulting in scum generation and agglomeration due to the use of high amounts of polymeric dispersion stabilizers which plasticize the thermoplastic resin.
Innovation Solution
A process involving the polymerization of a polymerizable component in an aqueous dispersion medium containing a polyester amide with a specific acid value (95-140 mgKOH/g) to produce heat-expandable microspheres, using a carboxylic acid and amino alcohol reaction product, which stabilizes oil globules and prevents coalescence, allowing for reduced amounts of dispersion stabilizers and maintaining expansion performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high amount of polymeric dispersion stabilizer is added to stabilize oil globules during polymerization, then the production yield of heat-expandable microspheres becomes constant and high, but the thermoplastic resin shell is plasticized and expansion performance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the dispersion stabilizer by specifying a polyester amide with a precise acid value range (95-140 mgKOH/g). This parameter control allows the stabilizer to effectively prevent oil globule coalescence and maintain high production yield while avoiding excessive plasticization of the thermoplastic resin shell, thus preserving expansion performance
Solution Approach 2:
The patent uses a composite approach by combining the polyester amide dispersion stabilizer with a thermoplastic resin having a specific glass transition temperature range (-50°C to 0°C). This composite system allows the stabilizer to perform its function at lower concentrations without compromising the shell's mechanical properties and expansion characteristics
2Productivity
If a high amount of polymeric dispersion stabilizer is used to prevent coalescence of oil globules, then constant and high-yield production is achieved, but scum generation occurs and particle stability is compromised
Solution Approach 1:
The patent specifies precise parameter ranges for the polyester amide including acid value (95-140 mgKOH/g), glass transition temperature (-50°C to 0°C), and molecular weight (10,000 to 100,000). These controlled parameters enable effective dispersion stabilization at lower concentrations, preventing both oil globule coalescence and scum formation during polymerization
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
This approach enables constant and high-yield production of heat-expandable microspheres with maintained expansion performance, reducing the need for excessive stabilizers and preventing plasticization of the thermoplastic resin, while also allowing for smaller particle sizes and improved stability.
Implementation Method 1
a polyester amide having a specific acid value... which stabilizes oil globules and prevents coalescence
Implementation Method 2
aqueous dispersion medium containing a polyester amide... stabilizing the oil globules during the polymerization
Implementation Method 3
the polymerizable component is polymerized to produce heat-expandable microspheres containing the blowing agent encapsulated therein
Implementation Method 4
heat-expandable microspheres comprise a thermoplastic resin shell and a blowing agent (core) encapsulated therein
Implementation Method 5
heat-expandable microspheres... application thereof
Data Source
AI summary
A process for producing heat-expandable microspheres which enables constant and high-yield production of heat-expandable microspheres having a mean particle size ranging from 0.01 to 10 μm without deteriorating their expansion performance, and the application thereof. The process produces heat-expandable microspheres containing a thermoplastic resin shell and the blowing agent encapsulated therein. The process includes a step of dispersing a polymerizable component and the blowing agent in an aqueous dispersion medium containing a polyester amide having an acid value (mgKOH/g) ranging from 95 to 140 and a step of polymerizing the polymerizable component.