Polyamide Rubber Aqueous Dispersion Preventing Surfactant Bleeding
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Solution Overview
Problem
Current aqueous dispersions of polymeric rubber elastic bodies, such as styrene rubber, suffer from inferior abrasion resistance, flex resistance, oil resistance, and weather resistance, while polyamide rubber elastic bodies offer superior properties like transparency, flexibility, and chemical resistance but lack practical aqueous dispersion forms.
Innovation Solution
An aqueous dispersion of polyamide rubber elastic body is created by emulsifying polyamide rubber elastic bodies in an aqueous medium with a surfactant, specifically polyoxyalkylene alkyl ether sulfate, dialkyl sulfosuccinate, or ethylene oxide/propylene oxide copolymer, within a controlled concentration range to prevent surfactant bleeding and enhance transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an aqueous dispersion of styrene rubber elastic body is produced by conventional emulsification methods, then the dispersion can be manufactured, but the resulting molded articles show inferior abrasion resistance, flex resistance, oil resistance, and weather resistance
Solution Approach 1:
The patent changes the chemical composition parameter from styrene rubber to polyamide rubber elastic body, which fundamentally alters the performance characteristics. This parameter change enables the dispersion to achieve superior abrasion resistance, flex resistance, oil resistance, and weather resistance while maintaining manufacturability through emulsification processes
Solution Approach 2:
The patent uses polyamide rubber elastic body as a composite material that combines the benefits of rubber elasticity with the superior mechanical and chemical resistance properties of polyamide polymers. This composite approach allows achieving multiple performance requirements simultaneously
2Reliability
If polyamide rubber elastic body is used to produce molded articles, then excellent transparency, flexibility, and chemical resistance are achieved, but practical aqueous dispersion forms do not exist
Solution Approach 1:
The patent changes the physical state parameter of polyamide rubber elastic body from solid molded form to aqueous dispersion form. This is achieved by controlling particle size (0.1 to 5 μm) and using specific surfactants, enabling the material to be processed in liquid form while maintaining its excellent transparency, flexibility, and chemical resistance properties
Solution Approach 2:
The patent introduces surfactant as an intermediary substance to enable the formation of stable aqueous dispersion of polyamide rubber elastic body. The surfactant acts as a mediator between the hydrophobic rubber particles and hydrophilic aqueous medium, allowing the dispersion to be manufactured and processed
3Ease of manufacture
If surfactant is added to create aqueous dispersion of polyamide rubber elastic body, then the dispersion can be formed, but surfactant bleeding occurs which reduces transparency
Solution Approach 1:
The patent optimizes the surfactant concentration parameter within a specific range (1 to 20 parts by weight per 100 parts of polyamide rubber elastic body). This parameter optimization ensures sufficient surfactant for stable dispersion formation while preventing excessive surfactant that would cause bleeding and reduce transparency
Solution Approach 2:
The patent applies the principle of partial action by using the minimum sufficient amount of surfactant needed for stable dispersion. The controlled surfactant quantity is enough to maintain dispersion stability during storage and processing but insufficient to cause bleeding, thus preserving transparency
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 method produces molded articles with improved transparency and resistance properties, suitable for applications in packaging films, automotive parts, and medical devices, without surfactant bleeding, maintaining the polyamide rubber elastic body's inherent characteristics.
Implementation Method 1
an aqueous dispersion of polyamide rubber elastic body contains an aqueous medium and a polyamide rubber elastic body emulsified and dispersed in the aqueous medium in the presence of a surfactant
Implementation Method 2
a polyamide rubber elastic body emulsified and dispersed in the aqueous medium in the presence of a surfactant
Data Source
AI summary
An aqueous dispersion of polyamide rubber elastic body, which contains an aqueous medium and a polyamide rubber elastic body emulsified and dispersed in the aqueous medium in the presence of a surfactant. The surfactant is used in an amount of 1 to 20 parts by weight based on 100 parts by weight of the polyamide rubber elastic body, and is for example at least one member selected from the group consisting of a polyoxyalkylene alkyl ether sulfate, a dialkyl sulfosuccinate, a fatty acid salt and an ethylene oxide/propylene oxide copolymer. This aqueous dispersion can produce a molded article having the characteristics of the polyamide rubber elastic body, particularly a molded article which hardly suffers from bleeding of the surfactant and is excellent in transparency.