Multicomponent Adhesive for Building Construction Thermal Expansion
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Solution Overview
Problem
Existing adhesive systems for building and construction face challenges in handling diverse substrate materials, particularly with critical substrates like wood and thermal insulation boards, and struggle with thermal expansion and contraction, requiring high-performance adhesives that maintain reliability and elasticity to prevent delamination.
Innovation Solution
A two-component adhesive system comprising a dispersion with a dispersed polymer, an alkaline hydraulically hardening material, and a low molecular weight organic linker molecule with carboxyl and amino substituents, allowing for self-drying and forming ettringite, which provides excellent mechanical properties and elasticity to accommodate thermal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional adhesive systems are used for critical substrates like wood and thermal insulation boards, then the adhesive can be applied easily, but the bonding reliability deteriorates due to thermal expansion and contraction
Solution Approach 1:
The adhesive composition changes its physical-chemical parameters during curing: initially remaining flexible to accommodate thermal expansion differences, then progressively cross-linking to develop high bonding strength. The water-based dispersion allows the adhesive to remain workable during application while the curing process transforms it into a rigid, reliable bond.
Solution Approach 2:
The adhesive is a composite system combining organic polymer components (for flexibility and adhesion to diverse substrates) with inorganic mineral components (for structural strength and dimensional stability). This composite structure allows the adhesive to simultaneously provide flexibility for thermal movement and strength for reliable bonding.
2Strength
If rigid adhesive systems are used to ensure strong bonding, then bonding strength is improved, but the ability to accommodate thermal expansion and contraction deteriorates
Solution Approach 1:
The adhesive transitions from a dynamic, flexible state during application to a more rigid state during curing. The water-based dispersion allows initial flexibility for substrate movement, while the curing process progressively increases rigidity. This dynamic transformation allows the adhesive to adapt to thermal changes during service while maintaining strong bonding.
Solution Approach 2:
The adhesive formulation includes flexible polymer components and plasticizers that provide beforehand cushioning against thermal stresses. These components are built into the adhesive matrix in advance, allowing it to absorb and accommodate thermal expansion and contraction forces before they can cause delamination or bonding failure.
3Ease of manufacture
If prefabricated glass panes coated with acrylate mortar dispersion are used, then assembly is simplified, but the requirement for additional sealant and joints increases device complexity
Solution Approach 1:
The adhesive serves multiple functions simultaneously: it acts as the primary bonding agent, provides joint filling, and eliminates the need for separate sealant applications. This multi-functional adhesive reduces the number of different materials and steps required in the assembly process, simplifying the overall system while maintaining ease of manufacture.
Solution Approach 2:
The invention merges the functions of adhesion, sealing, and joint filling into a single adhesive system. By combining these functions, the need for separate sealant applications and additional joints is eliminated, reducing device complexity while maintaining assembly simplicity.
4Loss of time
If under-hydrated mortar is used for pre-fabricated glass panes, then initial setting is faster, but complete hydration and final bonding strength are compromised
Solution Approach 1:
The adhesive curing process continues progressively over time with continuous cross-linking and strength development. Unlike under-hydrated mortar that stops setting prematurely, this adhesive maintains continuous useful action through complete curing, ensuring that final bonding strength is achieved without compromising the initial working time.
Solution Approach 2:
The adhesive undergoes controlled parameter changes during curing, with water content and cross-linking density evolving progressively. This allows the adhesive to transition from a workable state to a fully cured, high-strength state without the premature stopping that occurs in under-hydrated mortar systems.
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 adhesive system ensures reliable bonding of large and heavy covering elements to substrates with different thermal expansion coefficients, offering self-drying capabilities and improved flexibility, suitable for various building applications including ETICS systems, while eliminating the need for joints and enhancing water resistance.
Implementation Method 1
an alkaline hydraulically hardening material... allowing for self-drying and forming ettringite
Implementation Method 2
forming ettringite... provides excellent mechanical properties
Implementation Method 3
dispersion containing a dispersed polymer... reliable bonding of large and heavy covering elements to substrates
Implementation Method 4
dispersion containing a dispersed polymer... excellent mechanical properties
Implementation Method 5
substrates with different thermal expansion coefficients... accommodate thermal changes
Implementation Method 6
improved flexibility... accommodate thermal changes
Implementation Method 7
low molecular weight organic linker molecule carrying two or more substituents independently selected from carboxyl (COOH) and amino (NH2)
Data Source
AI summary
An aqueous multicomponent adhesive system appropriate in the building and construction field of use, said system comprising a dispersion containing an aqueous polymer dispersion in a first component and, in a further (e.g. second) component, an alkaline hydraulically hardening material, at least one low molecular weight organic linker compound carrying two or more substituents independently selected from carboxyl and amino, and a pulverous rubber material; its use, products obtained therewith and the like. These adhesives are e.g. useful in the field of thermal insulation composite systems to glue decorative and/or protective covering elements.