Highly Filled Urethane Systems with Segmented Mineral Fillers
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Solution Overview
Problem
Developing highly filled urethane systems that incorporate a substantial amount of mineral filler, such as calcium carbonate, talc, and mica, while maintaining acceptable cure kinetics and mechanical properties, is challenging due to the high viscosity issues and historical disadvantages associated with calcium carbonate usage.
Innovation Solution
A highly filled urethane system comprising an isocyanate component, a polyol component, and a mineral filler selected from talc, mica, and calcium carbonate, with the mineral filler constituting between 0 to 50% by weight, and optionally including additives like catalysts and UV protection, where the filler is added to either the isocyanate or polyol component to achieve improved stability and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If mineral filler is added to polyol to create highly filled urethane systems, then cost is decreased and filler content is increased, but viscosity increases significantly making processing difficult
Solution Approach 1:
The patent divides the filler addition process into two separate stages: first adding filler to the polyol component, then adding additional filler to the isocyanate component. This segmentation allows each component to be filled to optimal levels without creating excessive overall viscosity that would prevent processing. The segmented approach enables achieving 35-95 wt% total filler content while maintaining workability.
Solution Approach 2:
The patent changes the parameter of filler distribution by specifying different filler amounts for each component (polyol and isocyanate) rather than adding all filler to one component. This parameter change optimizes the viscosity-filler content relationship, allowing high overall filler loading while maintaining acceptable viscosity for foam formation and curing.
2Quantity of substance
If calcium carbonate is used as mineral filler to reduce cost and increase filler loading, then cost decreases and filler content increases, but tensile strength and elongation are significantly reduced
Solution Approach 1:
The patent uses calcium carbonate as the primary mineral filler (35-95 wt% of total filler) to achieve cost reduction and high filler loading, accepting the trade-off in tensile strength and elongation. The composite material approach combines calcium carbonate's cost advantages with the structural requirements of the urethane foam system, creating a economically viable highly filled material for applications where extreme tensile properties are not the primary requirement.
3Quantity of substance
If high levels of mineral filler are incorporated into urethane systems, then cost is decreased and filler content is increased, but cure kinetics are adversely affected
Solution Approach 1:
The patent segments the filler addition between polyol and isocyanate components, which helps maintain optimal component ratios and reaction kinetics. By distributing filler strategically, the system maintains adequate mobility of reactive components for proper curing while achieving high overall filler content.
Solution Approach 2:
The patent optimizes the NCO:OH ratio parameter in the presence of high filler content to maintain acceptable cure kinetics. By adjusting this critical reaction parameter and distributing filler between components, the system achieves high filler loading (35-95 wt%) while preserving adequate cure rates and crosslinking efficiency.
4Quantity of substance
If calcium carbonate is used as filler, then cost is decreased and filler content is increased, but resistance to organic acids is reduced
Solution Approach 1:
The patent employs calcium carbonate as the primary filler (35-95 wt% of total filler) in the composite urethane system, accepting the reduced resistance to organic acids as a trade-off for achieving high filler content and cost reduction. The composite material structure provides adequate performance for applications where acid resistance is not the primary requirement.
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 solution enables the production of urethane systems with improved stability to UV exposure and enhanced mechanical properties without the need for special precautions, allowing for the use of calcium carbonate without its historical disadvantages, and maintaining flowability and curing consistency.
Implementation Method 1
Polyurethanes are typically formed by the reaction of isocyanate and polyol
Data Source
AI summary
The invention relates to highly filled urethane systems, methods of making the urethane systems, and their use in commercial applications. More particularly, the invention includes urethane systems with a substantial amount of mineral filler that have acceptable cure kinetics and mechanical properties. The urethane systems include an isocyanate component, a polyol component, and a mineral filler that, in certain embodiments, is selected from talc, mica, calcium carbonate and mixtures or blends thereof.