Polyurethane Composite Materials with High Inorganic Filler Content
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Solution Overview
Problem
Existing polymeric composite materials face challenges in achieving a balance between mechanical strength, environmental friendliness, and cost-effectiveness, particularly in building materials, due to limitations in filler content and processing complexity.
Innovation Solution
The development of highly filled polyurethane composite materials using a reaction mixture of monomeric or oligomeric poly- or di-isocyanates and polyols, with inorganic fillers like fly ash, and additives such as chain extenders and solvents, which are processed through extrusion and molding to create strong, durable, and cost-effective building products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If inorganic filler content is increased to reduce cost and improve environmental friendliness, then material cost and environmental sustainability improve, but mechanical strength and processing difficulty deteriorate
Solution Approach 1:
The patent uses composite materials by combining polyurethane polymer matrix with inorganic fillers (fly ash, bottom ash, sand, gravel) to create a composite construction material that maintains structural integrity while incorporating high volumes of recycled inorganic content for cost reduction and environmental benefits
Solution Approach 2:
The patent changes the parameters of the polyurethane system by adjusting the ratio of polyol to isocyanate, modifying the polymer composition and curing conditions to optimize the binding effectiveness at high filler loadings, thereby maintaining mechanical strength despite increased inorganic content
2Ease of manufacture
If inorganic filler content is increased to reduce material cost, then cost-effectiveness improves, but processing complexity increases
Solution Approach 1:
The patent merges multiple processing steps into a unified system where recycled inorganic materials are directly incorporated into the polyurethane mixing and pouring process, eliminating separate preparation stages and simplifying overall manufacturing despite high filler content
Solution Approach 2:
The patent employs self-leveling and self-compacting properties of the polyurethane foam system that automatically distributes and consolidates the high-volume inorganic filler mixture without requiring complex external compaction equipment or multi-stage processing
3Object-affected harmful factors
If inorganic filler content is increased to improve environmental sustainability, then environmental friendliness improves, but mechanical properties deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyurethane system by adjusting polyol-to-isocyanate ratios and incorporating specific additives that enhance adhesion to inorganic surfaces, allowing the binder to effectively hold together high volumes of recycled fillers while maintaining acceptable mechanical properties
Solution Approach 2:
The patent creates a composite material system where the polyurethane matrix and inorganic filler work synergistically, with the polymer providing binding and flexibility while the inorganic materials provide structural bulk and stability, achieving both environmental sustainability and adequate mechanical performance
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 resulting polyurethane composite materials exhibit enhanced mechanical properties, improved weathering resistance, and reduced costs, while maintaining environmental sustainability, suitable for various structural and decorative applications.
Implementation Method 1
polyurethane formed by reaction of a reaction mixture of one or more monomeric or oligomeric poly- or di-isocyanates; and at least one polyol
Data Source
AI summary
Polymeric composite materials, particularly highly filled polyurethane composite materials are described herein. Such highly filled polyurethane composite materials may be formed by reaction and extrusion of one or more polyols, one or more di- or poly-isocyanates, and from about 45 to about 85 weight percent of inorganic filler such as fly ash. Certain polyols, including plant-based polyols can be used. Certain composite materials also contain chain extenders and/or crosslinkers. The polyurethane composite material may also contain fibers such as chopped or axial fibers which further provide good mechanical properties to the composite material. Shaped articles containing the polyurethane composite material have been found to have good mechanical properties, such that the shaped articles are suitable for building applications.