Polyether Polyurethane Orthopedic Fixation Temperature Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polyurethane materials for external fixation systems in orthopedics face challenges with hardening issues at low temperatures and excessive heat production at higher temperatures, making them unsuitable for varied environmental conditions.
Innovation Solution
A polyether polyurethane is developed using a polyether polyol mixture and modified isocyanate with specific weight ratios, incorporating catalysts, foam stabilizers, foaming agents, fillers, and functional additives, allowing for controlled polymerization and improved temperature stability, enabling effective fixation across a range of temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyurethane is used for external fixation, then fixation strength is achieved, but hardening fails at low temperatures (5-15°C) and excessive heat is generated at higher temperatures (25-30°C)
Solution Approach 1:
The patent modifies the chemical composition parameters of the polyurethane by incorporating specific ratios of polyether polyol (60-65 wt%), polyester polyol (25-40 wt%), and modified isocyanate (0.3-1 wt% catalyst), along with foam stabilizers and functional additives. This compositional parameter adjustment enables the material to maintain proper hardening characteristics across the temperature range of 5-30°C, resolving both the hardening reliability and temperature adaptability issues simultaneously
2Productivity
If polyurethane hardening is accelerated for faster fixation, then productivity improves, but heat production increases causing harmful thermal effects
Solution Approach 1:
The patent introduces a catalyst component (0.3-1 wt% of modified isocyanate) that accelerates the polyurethane hardening reaction, improving productivity. Simultaneously, the formulation includes heat-regulating functional additives and optimizes the polyol-to-isocyanate ratio to control the exothermic reaction, preventing excessive heat generation. This dual approach resolves the contradiction between hardening speed and heat production by adjusting chemical reaction parameters
3Ease of manufacture
If simple polyurethane formulation is used, then manufacturing cost is reduced, but performance in complex environmental conditions deteriorates
Solution Approach 1:
The patent creates a composite polyurethane formulation combining multiple components: polyether polyol (60-65 wt%), polyester polyol (25-40 wt%), modified isocyanate (0.3-1 wt% catalyst), foam stabilizers (0.1-2 wt%), and functional additives (0.5-2 wt%). This composite structure integrates the advantages of different materials to achieve reliable performance across varying temperatures and environmental conditions while maintaining manufacturing feasibility through standardized production processes
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 polyurethane provides sufficient rigidity and intensity for fracture fixation, allows X-ray penetration, is sanitary, easy to clean, and reduces heat production, offering a cost-effective alternative with better fixation than metal stents and polymer bandages while minimizing infection risk.
Implementation Method 1
In the polymerization reaction of the polyether polyol and the modified isocyanate, reaction occurs between the hydroxyl groups within the polyether polyol and the isocyanate groups within the modified isocyanate to form the polyether polyurethane having urethane groups
Data Source
AI summary
A polyurethane used for orthopedics external fixing system in complex environment is obtained by reaction of mixture of polyether polyol with modified isocyanate in the weight ratio of 1:0.6-0.75. The modified isocyanate is obtained by reaction of polyphenylene polymethylene isocyanate with polyether glycol. The components and corresponding weight percent amounts of the mixture of polyether polyol are as follows: 60-65% polyether polyol; 0.3-1% catalyst; 0.1-2% foam stabilizer; 0.1-2% or 3-20% foaming agent; 25-40% filler and 0.5-2% functional auxiliary agent. The method of producing the polyurethane is also provided.