Polyamide Elastomer Dispersion Low-Temperature Stability
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Solution Overview
Problem
Aqueous dispersions of polyamide-based rubber-like elastomers lack storage stability at low temperatures and require improvement in heat resistance and mechanical properties when used as coating materials.
Innovation Solution
Incorporating a copolymer of ethylene with an ethylenically unsaturated carboxylic acid and optionally an acrylic acid-based crosslinked polymer into the aqueous dispersion, along with adjusting the pH, to enhance stability, heat resistance, and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional emulsification process is used for polyamide-based rubber-like elastomer, then the dispersion can be produced, but storage stability at low temperature deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the aqueous dispersion by incorporating specific copolymers (ethylene-vinyl alcohol copolymer and/or ethylene-acrylic acid copolymer) in controlled amounts (0.1-10 parts by weight per 100 parts by weight of polyamide-based rubber-like elastomer). This compositional parameter change resolves the contradiction by providing low-temperature stability without compromising the dispersion production process.
Solution Approach 2:
The invention creates a composite aqueous dispersion system by combining polyamide-based rubber-like elastomer with specific copolymers (ethylene-vinyl alcohol copolymer and/or ethylene-acrylic acid copolymer). This composite material approach resolves the technical contradiction by leveraging the complementary properties of the copolymers to enhance low-temperature storage stability while maintaining the base elastomer's performance.
2Ease of manufacture
If aqueous dispersion of polyamide-based elastomer is used as coating material, then coating function is achieved, but heat resistance and mechanical properties deteriorate
Solution Approach 1:
The invention optimizes the concentration parameters of copolymers in the aqueous dispersion (0.1-10 parts by weight per 100 parts by weight of elastomer) to achieve a balance between coating applicability and performance. This parameter optimization ensures that the dispersion remains processable as a coating material while the copolymers enhance heat resistance and mechanical properties of the resulting coating.
Solution Approach 2:
The invention develops a composite coating system where polyamide-based rubber-like elastomer is combined with ethylene-vinyl alcohol copolymer and/or ethylene-acrylic acid copolymer. This composite formulation resolves the contradiction by providing both coating functionality and enhanced mechanical/thermal performance through synergistic material interactions.
3Reliability
If copolymer amount is increased to improve storage stability, then low temperature stability improves, but viscosity and handling properties deteriorate
Solution Approach 1:
The invention precisely controls the concentration parameter of copolymers within the range of 0.1-10 parts by weight per 100 parts by weight of polyamide-based rubber-like elastomer. This optimized parameter range resolves the contradiction by providing sufficient low-temperature stability while maintaining acceptable viscosity and handling properties for practical application.
Data Source
AI summary
The present invention provides an aqueous dispersion comprising a polyamide-based rubber-like elastomer emulsified and dispersed therein, wherein 0.8 to 10 parts by weight of a copolymer of ethylene with an ethylenically unsaturated carboxylic acid, relative to 100 parts by weight of the polyamide-based rubber-like elastomer is contained. The aqueous dispersion of the present invention is a novel aqueous dispersion of polyamide-based rubber-like elastomer that is excellent in storage stability at low temperatures, and that can provide processed products excellent in flexibility and heat resistance when used as a coating material.