Polyurethane Mixing Chamber Nozzle Height for Low-GWP Agents
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Solution Overview
Problem
The polyurethane foam industry faces challenges in replacing ozone-depleting and high Global Warming Potential (GWP) blowing agents, such as CFCs and HCFCs, with effective alternatives that require adaptations in chemical formulations and mixing systems to achieve desired foam properties.
Innovation Solution
A mixing apparatus with a chamber having nozzles positioned at different heights for injecting selected blowing agents with low or zero Ozone Depletion Potential (ODP) and GWP less than 1500, combined with a static mixer for enhanced homogeneity, facilitates the production of high-quality polyurethane foam by impingement mixing of polyol and blowing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CFCs and HCFCs are used as blowing agents, then the foam expansion and insulation properties are improved, but the environmental harm (ODP and GWP) increases
Solution Approach 1:
The patent changes the chemical composition parameters of blowing agents from CFCs/HCFCs (high ODP/GWP) to HFO-1234ze and other low-GWP alternatives. This parameter change maintains foam expansion properties while reducing environmental harm to acceptable levels (GWP < 1500, ODP ≈ 0), directly resolving the contradiction between performance and environmental impact
Solution Approach 2:
The patent converts the previously harmful high-GWP blowing agents into beneficial low-GWP alternatives by selecting HFO-1234ze and other compounds with GWP < 1500. This transformation maintains the necessary foam expansion function while the environmental harm is converted into an acceptable level that complies with regulations, effectively resolving the contradiction
2Manufacturing precision
If multiple blowing agents with different boiling points are injected at different heights, then the mixing homogeneity and foam quality are improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by positioning nozzles at different heights (first nozzle at top, second nozzle at bottom) according to the different boiling points of blowing agents. This localized differentiation in injection positions optimizes mixing homogeneity for each agent type, resolving the contradiction by making the device structure adapt to the specific requirements of different chemicals
Solution Approach 2:
The patent segments the injection system into multiple nozzles positioned at different heights within the mixing chamber. This segmentation allows different blowing agents to be injected at optimal locations based on their boiling points, improving mixture homogeneity while keeping each nozzle simple in design, thus resolving the contradiction between precision and complexity
3Object-generated harmful factors
If chemical formulations are adapted for new blowing agents, then the environmental compliance is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent changes the chemical formulation parameters by selecting blowing agents with GWP < 1500 and ODP ≈ 0 (such as HFO-1234ze). This parameter change achieves environmental compliance while the mixing system is adapted with multiple nozzles to handle the different physical properties of these new agents, resolving the contradiction between compliance and process 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 solution enables the production of polyurethane foam with improved homogeneity and reduced environmental impact by using alternative blowing agents, offering manufacturers flexibility in formulations and reducing operational costs while meeting environmental regulations.
Implementation Method 1
a mixing chamber (100) having a plurality of nozzles (110, 120, 130, 140, 150) to inject a polyol and blowing agents into the chamber
Implementation Method 2
the plurality of nozzles are positioned at different height levels on the mixing chamber (100) and the different blowing agents are injected via the nozzles according to their boiling points
Implementation Method 3
the mixing apparatus comprises a static mixer for additional mixing of the mixture composition discharged from the mixing chamber
Data Source
AI summary
Embodiments of the invention describe methods and apparatus for mixing chemical components in the manufacture of polyurethane foam. The chemical components include a polyol and different blowing agents. The blowing agents are injected directly into a mixing chamber (100) at different height levels according to their boiling points. The mixing chamber allows continuous discharge of the mixture into a static mixer (400) for further mixing before being stored into a storage tank (600). The blowing agents are chemical compounds selected from the group consisting of hydrocarbon-containing compounds, hydrofluorocarbon-containing compounds or hydrofluoroolefin-containing compounds.