Cementitious Composition with Powdered Polyurethane
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Solution Overview
Problem
Cementitious compositions, such as tile adhesives and thermal insulation systems, face challenges in achieving low fresh density and high deformability, with existing solutions using costly and environmentally impactful synthetic latex polymers, and previous attempts with powdered polyurethane compromising strength development and deformability.
Innovation Solution
A cementitious composition incorporating a composite hydraulic binder, powdered polyurethane, and optional aggregates, where the composite hydraulic binder includes CEM types and supplementary cementing materials, enhancing deformability and allowing for reduced fresh density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If powdered polyurethane is used as aggregate replacement in cementitious compositions, then deformability is improved, but strength development is negatively impaired
Solution Approach 1:
The patent applies composite materials by combining powdered polyurethane with a redispersible polymer powder to create a blended adhesive system. This composite approach allows the polyurethane to provide deformability while the polymer powder compensates for strength losses, resolving the contradiction between improved deformability and maintained strength development.
Solution Approach 2:
The patent changes the chemical and physical parameters of the cementitious composition by introducing specific ratios of powdered polyurethane (5-50 mass parts) and redispersible polymer powder (5-50 mass parts), along with controlling water content (10-40 mass parts). These parameter adjustments optimize both deformability and strength development simultaneously.
2Stability of the object's composition
If high amounts of soft synthetic latex polymers are used to achieve high deformability, then deformability requirements are met, but cost and carbon footprint increase
Solution Approach 1:
The patent employs powdered polyurethane, a more cost-effective and environmentally friendly alternative to soft synthetic latex polymers. This material provides the necessary deformability for tile adhesives without the high cost and carbon footprint associated with traditional latex polymers, while still meeting performance requirements.
Solution Approach 2:
The patent utilizes recycled polyurethane materials as a sustainable alternative to virgin synthetic polymers. By recovering and reusing polyurethane that would otherwise be waste, the invention reduces both cost and environmental impact while maintaining the deformability required for cementitious tile adhesives.
3Weight of stationary object
If powdered polyurethane is used to reduce fresh density, then application efficiency is improved, but deformability is significantly lowered
Solution Approach 1:
The patent creates a composite system blending powdered polyurethane with redispersible polymer powder, where the polyurethane provides lightweight properties for reduced fresh density, while the polymer powder contributes to maintaining deformability. This composite approach resolves the contradiction between weight reduction and deformability preservation.
Solution Approach 2:
The patent optimizes the composition parameters by controlling the mass parts of powdered polyurethane (5-50), redispersible polymer powder (5-50), and water (10-40), achieving a balance where fresh density is reduced through polyurethane content while deformability is maintained through the synergistic polymer blend.
Data Source
AI summary
A cementitious composition, in particular a dry mortar, including a) 5-50 mass parts, preferably 10-45 mass parts, more preferably 15-29 mass parts of a composite hydraulic binder, b) 0.1-4 mass parts, preferably 0.5-3 mass parts, more preferably 1-2 mass parts of powdered polyurethane, and c) optionally 50-90 mass parts, preferably 60-85 mass parts of aggregate. The cementitious composition is particularly useful as a cementitious tile adhesive, a render or part of a render system.