Single-Component Moisture-Curable Adhesives Without Mixing
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Solution Overview
Problem
Existing adhesives face issues such as toxicity, flammability, allergenicity, slow curing, and performance limitations in low temperature or humid environments, requiring precise mixing and external energy sources for curing, which restrict their usability and safety.
Innovation Solution
Development of single-component, stimuli-responsive adhesives that cure in response to ambient moisture, mild heat, or physical contact, eliminating the need for mixing or external energy initiation, using microencapsulation and water-activated initiating systems with ascorbic acid derivatives and peroxides to trigger polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two-component adhesive systems are used to achieve high strength bonding, then bonding strength is improved, but device complexity and ease of operation deteriorate due to requiring accurate measuring and thorough mixing
Solution Approach 1:
The patent combines the base component (containing monomers, oligomers, and polymers) and the hardener component (catalysts and curing agents) into a single-component adhesive system. The adhesive contains both reactive components pre-mixed in compatible proportions, eliminating the need for separate measuring and mixing steps while maintaining the crosslinking chemistry that provides high bonding strength.
Solution Approach 2:
The adhesive system is prepared in advance with all necessary components (monomers, oligomers, polymers, catalysts, and curing agents) pre-combined in the correct ratios. This preliminary formulation allows the adhesive to be applied directly without requiring the user to perform mixing operations, while still enabling the crosslinking reaction to occur after application.
2Strength
If two-component adhesive systems are used to achieve high strength bonding, then bonding strength is improved, but device complexity deteriorates due to requiring accurate measuring and thorough mixing
Solution Approach 1:
The patent merges the base component and hardener component into a single integrated adhesive formulation. The adhesive contains monomers, oligomers, polymers, catalysts, and curing agents all pre-combined in compatible proportions, reducing the system from two separate components requiring precise measurement and mixing to a single-component system that can be applied directly.
3Ease of operation
If single component adhesives are used to simplify application, then ease of operation is improved, but curing speed deteriorates due to slow development of tack requiring fixturing
Solution Approach 1:
The patent modifies the chemical parameters of the adhesive system by incorporating specific catalysts and curing agents in optimized concentrations. This enables the single-component adhesive to undergo rapid crosslinking reactions upon exposure to ambient moisture or heat, achieving fast tack development and curing speeds comparable to two-component systems while maintaining the simplicity of single-component application.
Solution Approach 2:
The patent replaces the need for mechanical fixturing or bracing (required by slow-curing adhesives) with a chemically accelerated curing mechanism. The enhanced crosslinking chemistry provides rapid tack development that eliminates the need for external mechanical support during curing, allowing immediate handling or reduced fixturing requirements.
4Ease of operation
If solvent-based adhesives are used to achieve ease of application, then ease of operation is improved, but harmful factors worsen due to toxic and flammable solvents
Solution Approach 1:
The patent changes the fundamental composition parameters of the adhesive by formulating it as a water-based or solvent-free system. The adhesive uses water or minimal safe solvents instead of toxic organic solvents, eliminating flammability hazards and reducing toxicity while maintaining the desired application properties such as viscosity and spreadability through careful selection of polymers and additives.
Solution Approach 2:
The patent converts the traditionally harmful role of solvents (which provide ease of application but cause toxicity and flammability) into a beneficial water-based system. Water serves as the dispersion medium, providing easy application through its safety profile, while the adhesive achieves proper rheology and bonding performance through optimized polymer and additive formulations.
5Object-generated harmful factors
If water-based adhesives are used to reduce toxicity, then harmful factors are reduced, but performance in low temperature and humid environments deteriorates with extended drying time
Solution Approach 1:
The patent modifies the chemical composition parameters of the water-based adhesive by incorporating hydrophobic polymers, crosslinking agents, and catalysts that enable the adhesive to cure through chemical crosslinking rather than solely relying on water evaporation. This allows the adhesive to maintain water-based safety (low toxicity) while achieving reliable bonding in low temperature and humid environments where evaporation is slow, as the crosslinking reaction proceeds independently of moisture loss.
6Productivity
If hot melt adhesives are used to achieve rapid setting, then productivity is improved, but adaptability deteriorates due to loss of strength in warm conditions and requirement of heat source
Solution Approach 1:
The patent replaces the thermal mechanism of hot melt adhesives (which require heating to melt and cooling to set) with a chemical crosslinking mechanism. The adhesive cures through chemical reactions (crosslinking) that can be initiated by ambient moisture, heat, or catalysts, providing rapid setting without requiring high-temperature application equipment. This enables use in applications where heat sources are unavailable or where the bonded parts cannot tolerate high temperatures.
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
Provides a non-toxic, high-strength adhesive system that is user-friendly and effective across various environmental conditions, overcoming the limitations of traditional adhesives by ensuring rapid curing without external stimuli.
Implementation Method 1
single component moisture-curable adhesives... in which the polymerization/curing reaction is triggered by ambient moisture
Implementation Method 2
water-activated initiating systems with ascorbic acid derivatives and peroxides to trigger polymerization
Implementation Method 3
cure in response to an applied stimulus... rapid curing without external stimuli
Data Source
AI summary
Disclosed are single component, stimuli-responsive adhesives that cure in response to an applied stimulus, including single component moisture-curable adhesives (e.g., moisture-curable (meth)acrylate/polyurethane hybrid adhesives). These adhesive compositions can combine the non-toxic, high strength properties of (meth)acrylate adhesives with the bonding characteristics of polyurethanes. The compositions described herein employ imitator systems which trigger polymerization/curing of the adhesive composition in response to a stimulus, such as ambient moisture, mild heat, and/or by physical stress. These strategies eliminate the need for mixing or an external energy stimulus to initiate curing. In this way, the benefits of polyurethane adhesive chemistry can be brought to the consumer market, in a system that is readily usable by the average individual.