Dry Mortar Mixture Superabsorbent Polymer Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern dry mortar mixtures, particularly in tile adhesives and other applications, face challenges in achieving high rheological processing properties, water retention, abrasion resistance, scratch resistance, and adhesive tensile strengths on various substrates while being cost-effective and economically efficient, with existing additives like redispersible polymer powders being very costly and hydrophobic agents leading to poor processability and increased costs.
Innovation Solution
A dry mortar mixture containing a superabsorbent polymer with adapted water absorption capacity and a dispersant, such as a branched comb polymer or naphthalene sulfonate-formaldehyde condensate, combined with a water repellent, to enhance stability, reduce water absorption, and improve flexibility and crack resistance, allowing for reduced dosages of thickeners and dispersion powders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redispersible polymer powders are used to improve rheological properties, water retention, and adhesive strength, then processing properties and qualitative properties are improved, but manufacturing costs increase significantly
Solution Approach 1:
The patent combines superabsorbent polymer particles (0.1-1.0 wt%) with dispersants (0.05-0.5 wt%) to achieve the desired rheological and adhesive properties. This combination replaces the need for expensive redispersible polymer powders while maintaining or improving performance in water retention, adhesive strength, and processing characteristics.
Solution Approach 2:
The patent employs cost-effective alternatives: superabsorbent polymer particles (typically crosslinked polyacrylic acid or similar materials) and standard dispersants replace expensive redispersible polymer powders. These materials provide comparable or superior functionality at lower cost, making the mortar mixture more economically viable.
2Object-affected harmful factors
If hydrophobic agents are used to improve water repellency, then resistance to water absorption is improved, but processability deteriorates and costs increase
Solution Approach 1:
The patent introduces superabsorbent polymer particles as an intermediary substance that manages water in the mortar mixture. These particles absorb excess water and release it gradually, maintaining optimal workability during application while preventing excessive water absorption from the environment. This mediates between water repellency requirements and processability needs without requiring hydrophobic agents.
3Ease of operation
If high water content is used to improve flowability, then processing properties are improved, but stability and crack resistance deteriorate
Solution Approach 1:
The patent changes the water management parameters by incorporating superabsorbent polymer particles that dynamically adjust water availability. These particles absorb free water when present in excess (preventing cracks and maintaining stability) and release water when needed (maintaining flowability and workability). This parameter control allows the mortar to exhibit good flowability at application while maintaining stability and crack resistance during curing.
4Ease of operation
If dispersants are used to improve flowability with low water content, then flowability is improved, but stability of the mortar deteriorates
Solution Approach 1:
The patent creates a composite system combining superabsorbent polymer particles with dispersants. The dispersant provides initial flowability by reducing friction between particles, while the superabsorbent polymer particles provide structural stability by absorbing and retaining water. This composite approach allows low water content formulation while maintaining both flowability and stability, resolving the contradiction between these two properties.
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 combination of superabsorbent polymers and dispersants in dry mortar mixtures improves processing and qualitative properties, reduces water absorption, and decreases the formation of cracks, while also lowering the overall cost and improving adhesive tensile strength, making the mixtures more suitable for vertical applications without compromising stability or hydrophobicity.
Implementation Method 1
A dry mortar mixture containing a superabsorbent polymer with adapted water absorption capacity
Implementation Method 2
superabsorbent copolymer which is suitable for increasing the tolerance to increased W/C values
Implementation Method 3
The dispersants disperse the inorganic binder and the fillers and thus achieve very good flowability even with low water content
Implementation Method 4
In this context and in order to mitigate these negative effects, the expert resorts to water repellents as an additive
Data Source
AI summary
The invention relates to a dry mortar mixture based on at least one hydraulic and/or latent hydraulic binder comprising stable properties in a prepared and not yet cured state. The novel dry mortar mixture is characterized in that said mixture comprises at least one substitute for a dispersing agent and at least one compound having super absorbing properties. Using said mixture, it is possible to transfer the advantages of known tile mortar for horizontal applications to potential vertical applications.