Coagulatable Polymer Dispersion Adhesive for Rapid Bonding
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Solution Overview
Problem
Current adhesive systems in packaging and bookbinding face challenges such as low heat resistance, mechanical strength, and productivity due to the limitations of dispersion adhesives and hot melt adhesives, which either lack speed or compromise on strength and durability.
Innovation Solution
A coagulum is created through thermal, mechanical, or ultrasound-initiated coagulation of an aqueous polymer dispersion containing thermoplastic microspheres and additional components like polyols or thermoplastic polymers, which can be formulated to behave like a hot melt adhesive during application and retain properties of dispersion adhesives post-application, offering rapid strength buildup and high heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot melt adhesives are used for rapid bonding, then productivity and setting speed are improved, but heat resistance and mechanical strength deteriorate
Solution Approach 1:
The invention changes the physical state parameter of the adhesive from liquid (dispersion) to solid (coagulated mass) through thermal, mechanical, or ultrasound treatment during application. This allows the adhesive to exhibit rapid setting characteristics similar to hot melt while maintaining the superior strength and heat resistance of dispersion adhesives in the coagulated state
Solution Approach 2:
The adhesive composition combines multiple components including polymer dispersion, polyols, polyamines, and thermoplastic polymers to create a composite system that exhibits both rapid setting behavior and superior mechanical properties. The coagulated mass formed during application creates a composite structure that integrates the benefits of both hot melt and dispersion adhesive systems
2Productivity
If hot melt adhesives are used for rapid bonding, then productivity is improved, but heat resistance deteriorates
Solution Approach 1:
The invention transforms the adhesive from a liquid dispersion that remains heat-sensitive to a coagulated solid mass with enhanced thermal stability. The coagulation process fundamentally changes the thermal properties, allowing the adhesive to withstand higher temperatures while maintaining bonding strength
Solution Approach 2:
The composite adhesive system incorporates thermoplastic polymers and other components that provide heat resistance. The coagulated structure formed during application creates a network that resists thermal degradation, enabling the adhesive to maintain performance at elevated temperatures
3Strength
If dispersion adhesives are used for strength, then mechanical strength is improved, but productivity deteriorates
Solution Approach 1:
The invention performs preliminary coagulation of the polymer dispersion during the application process itself, rather than requiring extended drying or curing time after application. This preliminary transformation to a coagulated mass state accelerates the setting process while maintaining the strength characteristics of dispersion adhesives
Solution Approach 2:
The invention utilizes phase transition from liquid dispersion to solid coagulated mass during application through thermal, mechanical, or ultrasound treatment. This phase change enables rapid setting comparable to hot melt adhesives while preserving the superior adhesive strength and heat resistance of dispersion-based systems
4Productivity
If hot melt adhesives are used for rapid setting, then productivity is improved, but reliability deteriorates
Solution Approach 1:
The invention changes the physical and chemical parameters of the adhesive system through coagulation, transforming it from a state prone to migration and degradation to a stable coagulated mass. This enhances long-term reliability while maintaining rapid setting characteristics
Solution Approach 2:
The composite adhesive formulation includes multiple components designed to work synergistically, creating a coagulated structure that provides both rapid setting and long-term bond durability. The combination of polymers, polyols, and polyamines creates a reliable adhesive system resistant to environmental degradation
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 coagulum achieves rapid adhesive strength comparable to hot melt systems while maintaining the heat and chemical resistance of dispersion adhesives, enhancing productivity and performance in bonding various substrates, including paper, cardboard, and 3D printing applications.
Implementation Method 1
thermal and/or mechanical and/or ultrasound-initiated coagulation of an aqueous polymer dispersion
Implementation Method 2
thermal and/or mechanical and/or ultrasound-initiated coagulation of an aqueous polymer dispersion
Implementation Method 3
thermal and/or mechanical and/or ultrasound-initiated coagulation of an aqueous polymer dispersion
Data Source
AI summary
The invention relates to an aqueous coagulatable polymer dispersion comprising at least one polymer which is dispersed in an aqueous phase, thermoplastic microspheres which contain a propellant, and at least one additional component which is selected from the group consisting of polyols, polyamines, and thermoplastic polymers. The invention further relates to a coagulate which can be obtained by the thermal and/or mechanical and/or ultrasonically initiated coagulation of the aqueous polymer dispersion according to the invention, to an adhesive comprising or consisting of the coagulate, to a substrate which is completely or partly coated with said coagulate, to a method for producing such a coated substrate, and to coated substrates which can be obtained using said method. The coagulate can be used as an adhesive or as a binder in 3D printing methods.