Clickable Waterborne Polymers for Coatings
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Solution Overview
Problem
Current waterborne polymers used in coatings and adhesives face limitations such as water sensitivity, heat-softening, and low hardness, along with challenges in achieving improved mechanical properties, water and chemical resistance, and scrubbability, while also requiring safer crosslinking strategies and functionalization for antimicrobial or infrared-refractive properties.
Innovation Solution
The development of clickable waterborne polymers with pendant groups bearing alkyne or azide groups, enabling copper-catalyzed azide-alkyne cycloaddition (CuAAC) for click crosslinking, and the incorporation of antimicrobial or infrared-refractive functional compounds to enhance mechanical strength, stability, and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If waterborne polymers are used as binders in coatings and adhesives, then environmental friendliness is improved by reducing VOC emissions, but mechanical properties and water resistance deteriorate compared to organic solvent-soluble systems
Solution Approach 1:
The patent creates composite waterborne polymer systems by incorporating crosslinking agents and functional additives into the polymer matrix. This forms a composite structure that combines the environmental benefits of waterborne polymers with the enhanced mechanical properties achieved through crosslinking and functional modification, resolving the contradiction between environmental friendliness and mechanical strength
Solution Approach 2:
The patent modifies the chemical and physical parameters of waterborne polymers through crosslinking degree control, functional group incorporation, and compositional adjustment. These parameter changes enable the polymer to achieve both low VOC emissions and improved mechanical properties, transforming the inherent limitations into optimized performance characteristics
2Strength
If traditional crosslinking systems like N-methylolacrylamide are used to enhance mechanical strength and water resistance, then film durability is improved, but formaldehyde emission increases creating health risks
Solution Approach 1:
The patent extracts and removes the harmful formaldehyde-generating component (N-methylolacrylamide) from the crosslinking system. By eliminating this specific crosslinking agent and replacing it with alternative crosslinking mechanisms, the system maintains mechanical strength and water resistance while removing the source of formaldehyde emissions and associated health risks
Solution Approach 2:
The patent converts the limitation of avoiding formaldehyde-emitting crosslinkers into a benefit by developing alternative crosslinking systems that not only eliminate harmful emissions but also provide comparable or superior performance. The alternative crosslinking mechanisms achieve the desired mechanical properties without the harmful byproducts, turning a restriction into an advantage
3Object-affected harmful factors
If waterborne polymers are used to achieve environmental friendliness, then water and chemical resistance deteriorates, but this can be improved through crosslinking modification
Solution Approach 1:
The patent creates composite waterborne polymer structures through crosslinking, forming a networked composite material that maintains the environmental benefits of waterborne formulation while achieving enhanced water and chemical resistance. The crosslinked composite structure provides the necessary reliability without sacrificing environmental friendliness
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 results in waterborne polymers with improved mechanical properties, enhanced water and chemical resistance, and the ability to create stable antimicrobial or infrared-refractive coatings or adhesives without burst release of toxic substances, addressing the limitations of existing crosslinking methods.
Implementation Method 1
copper-catalyzed azide-alkyne cycloaddition (CuAAC) for click crosslinking
Data Source
AI summary
Clickable waterborne polymers, click crosslinking of waterborne polymers, click crosslinked waterborne polymers, clickable functional compounds, and click functionalized waterborne polymers are presented. For example, the waterborne polymers have pendant groups bearing alkyne and/or azide groups and alkyne. For example, the functionalized azide-containing functional compounds such as antimicrobial or infrared-refractive compounds. The click crosslinking of clickable waterborne polymers or polymer mixtures, and the click conjugation of clickable waterborne polymers with clickable functional compounds such as clickable antimicrobial or infrared-refractive compounds, which resulted in functional waterborne polymers with antimicrobial or infrared-refractive functions, are presented. The presented polymers, including clickable waterborne polymers, click-crosslinked waterborne polymers, and functional waterborne polymers with, for example, antimicrobial or infrared-refractive functions, can be used in applications such as coating and adhesive compositions. The aqueous suspensions of waterborne polymers can also be used directly as drug delivery systems, or can be crosslinked into hydrogels or composites for biomedical applications such as drug/cell delivery, tissue engineering, and other medical device.