Polyelectrolyte Coacervate Adhesive for Fast Setting and Strength
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Solution Overview
Problem
Existing construction materials lack low-cost, water-based, one-component compositions with versatile applications that can set at low temperatures in humid environments and provide sufficient mechanical strength without chemical curing agents, and are recyclable.
Innovation Solution
Aqueous compositions comprising cationic and anionic polyelectrolytes, mineral salts, particulate fillers, and water-soluble polyphenols form polyelectrolyte coacervates that rapidly set at room temperature, enhanced by polyphenols acting as reinforcing agents and polyvalent transition metal salts, allowing for improved mechanical strength and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If polyelectrolyte coacervates are used to create water-based, one-component compositions for construction, then the compositions can set rapidly at room temperature without chemical curing agents, but the mechanical strength of the final product is insufficient
Solution Approach 1:
The patent combines polyelectrolyte coacervates with particulate fillers and polyphenols to create a composite material system. The fillers (such as calcium carbonate, silica, or other inorganic particles) are dispersed within the coacervate matrix to reinforce the structure and improve mechanical strength while maintaining the rapid setting capability of the polyelectrolyte complex.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the coacervate system by adjusting the ratio of cationic to anionic polyelectrolytes, the concentration of charge-screening salts, and the addition of polyphenols. These parameter changes optimize both the setting kinetics and the final mechanical properties of the material.
2Strength
If particulate filler is added to increase mechanical strength, then the production cost decreases, but the material becomes excessively brittle
Solution Approach 1:
The patent optimizes the particle size, concentration, and surface treatment of the particulate fillers to balance strength enhancement with brittleness control. By carefully adjusting these parameters, the material achieves improved mechanical strength while maintaining sufficient flexibility and durability.
Solution Approach 2:
The patent introduces polyphenols as intermediary substances that mediate between the particulate fillers and the polyelectrolyte matrix. The polyphenols form hydrogen bonding interactions with both the fillers and the polyelectrolytes, creating a more cohesive composite structure that reduces brittleness while maintaining the strength benefits of the fillers.
3Strength
If water-soluble polyphenol is added to improve mechanical performances, then the aromatic hydroxyl groups reversibly interact with polyelectrolytes to create physical crosslinking, but the composition complexity increases
Solution Approach 1:
The polyphenols incorporated into the coacervate system automatically engage in reversible interactions with the polyelectrolytes through hydrogen bonding, creating self-forming physical crosslinks. This self-service mechanism enhances mechanical properties without requiring external curing agents or complex processing steps, as the crosslinking occurs spontaneously upon mixing.
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 compositions demonstrate enhanced mechanical strength, suitability for construction applications, and recyclability, with rapid setting and curing in humid conditions, suitable for use in adhesives, sealants, and binders.
Implementation Method 1
When an aqueous solution of an anionic polyelectrolyte and an aqueous solution of a cationic polyelectrolyte are mixed together, the polyelectrolytes will immediately associate and form a solid complex
Implementation Method 2
When the aqueous polymer solutions contain water-soluble salts in a sufficient amount to at least partially screen the opposite charges of the polymers, the attraction between the polyanion and polycation will be reduced
Implementation Method 3
the aromatic hydroxyl groups of the polyphenols reversibly interact with the polyelectrolytes and/or with the transition metal ions thereby introducing additional links into the polymer network and creating a sort of reversible physical crosslinking
Implementation Method 4
its efficiency is improved when associated with very low amounts of polyvalent transition metal salts
Data Source
AI summary
The present invention is drawn to an adhesive or binder composition comprising, —a cationic polyelectrolyte, —an anionic polyelectrolyte, —a mineral salt selected from the group consisting of alkaline metal or alkaline earth metal halogenides, —a particulate mineral filler, —a water-soluble polyphenol comprising at least one polyhydroxylated aromatic ring structure, and —water It is also drawn to the use of such a composition as an adhesive, binder, coating or sealant in the construction industry.