Polyurethane Grout Density Control via Desiccant
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Solution Overview
Problem
Current polymer concretes face challenges in controlling density and foam structure, and they often rely on costly and limited natural fillers, with industrial waste materials like slag not easily replacing quartz aggregates without affecting physical and chemical properties.
Innovation Solution
Incorporating a desiccant, such as molecular sieves, into the curable binder composition to control density and foaming, allowing for the use of conventional and industrial waste fillers like slag, which reduces pore formation and enhances mechanical and chemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If natural fillers like quartz aggregates are used, then mechanical strength and stability are improved, but cost increases and availability decreases
Solution Approach 1:
The patent replaces expensive, limited natural fillers (quartz aggregates) with inexpensive, readily available industrial waste materials (steel slag, copper slag, blast furnace slag). These waste materials serve as functional substitutes that maintain mechanical strength while being abundant and cost-effective, embodying the principle of using cheap, readily available materials to replace expensive ones.
Solution Approach 2:
The patent modifies the chemical composition parameters of the filler material by substituting silica-based quartz with metal oxide-based slags. This parameter change in material composition allows the use of industrial waste materials that provide comparable mechanical properties while improving availability and reducing cost.
2Quantity of substance
If industrial waste materials like slag are used to replace natural fillers, then cost decreases and availability increases, but mechanical strength and chemical stability deteriorate
Solution Approach 1:
The patent creates a composite binder system combining polyurethane polymer matrix with industrial slag fillers. This composite material approach allows the use of weaker individual slag components while achieving overall mechanical strength through the synergistic combination of the polymer binder and filler particles. The polyurethane matrix compensates for the lower inherent strength of slag materials.
Solution Approach 2:
The patent changes the chemical environment by using polyurethane-based binders that create a protective matrix around slag particles, preventing chemical degradation and enhancing interfacial bonding. This parameter change in the binder chemistry enables industrial waste materials to achieve mechanical properties comparable to natural filler systems.
3Weight of moving object
If foam structure is introduced to reduce density, then weight decreases, but mechanical strength deteriorates
Solution Approach 1:
The patent applies local quality by creating a heterogeneous structure where dense, strong slag particles are distributed within a lighter polyurethane matrix. This local variation in density and strength properties allows the material to achieve reduced overall weight while maintaining localized strength at the particle-matrix interfaces and within the dense filler regions.
Solution Approach 2:
The patent uses composite material structure combining lightweight polyurethane foam matrix with dense slag aggregate particles. This composite approach creates a material that leverages the low density of the foam for weight reduction while utilizing the high strength of slag particles for mechanical reinforcement, achieving both goals simultaneously.
4Reliability
If polyurethane-based binders are used instead of epoxy resins, then chemical stability and corrosion resistance improve, but processing complexity increases
Solution Approach 1:
The patent extracts the problematic epoxy resin curing mechanism (which requires strict stoichiometric control and produces brittle networks) and replaces it with polyurethane chemistry that offers more tolerant processing conditions. This extraction of the problematic chemical system while retaining the protective performance benefits resolves the contradiction between reliability and processing complexity.
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 desiccant enables precise control of density and foam structure, improving mechanical strength, stability, and corrosion resistance, while allowing the use of globally available and cost-effective industrial waste materials, reducing the need for natural aggregates.
Implementation Method 1
Incorporating a desiccant, such as molecular sieves, into the curable binder composition to control density and foaming
Implementation Method 2
the curable binder consists of a polyisocyanate and a polyol, which react after mixing to form a chemically crosslinked polyurethane
Data Source
AI summary
The use of a desiccant for influencing the density of a curable binder composition including a) at least one organic binder including a polyisocyanate and a polyol, and b) at least 50% by weight of an inorganic filler F, more particularly in the form of quartz aggregates and/or slag, the proportions by weight being based on 100% by weight of the binder composition.