Telecommunication Enclosure Sealant Gel Using Composite Polyols
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Solution Overview
Problem
Existing sealant gels for telecommunication enclosures fail to maintain mechanical properties across a wide temperature range, degrading at high temperatures or becoming brittle at low temperatures, which compromises their sealing effectiveness.
Innovation Solution
A sealant gel formulation using a combination of polybutadiene-based polyol for low-temperature performance, polyether polyol for viscoelastic properties, and butene diol for fast curing and high-temperature resistance, creating a well-balanced network structure that maintains mechanical properties from -40°C to 120°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyether-polyol-based sealant gel is used, then good low-temperature performance is achieved, but the gel degrades at high temperatures due to cross-linked network breakage
Solution Approach 1:
The patent uses a composite polyol formulation combining three different polyols (polyether polyol, polyester polyol, and polybutadiene polyol) to create a sealant gel that achieves both low-temperature flexibility and high-temperature stability. The polyester polyol component specifically addresses high-temperature resistance while the polyether polyol provides low-temperature performance, and they work together in a composite system to resolve the contradiction.
Solution Approach 2:
The patent modifies the chemical composition parameters of the polyol base by incorporating specific ratios of different polyol types with distinct molecular structures and properties. This parameter change in the material composition enables the gel to maintain mechanical properties across extreme temperature ranges from -40°C to 120°C.
2Reliability
If polyester-based urethane sealant gel is used, then high-temperature resistance is improved, but the gel becomes brittle at subzero temperatures
Solution Approach 1:
The patent combines polyester polyol (for high-temperature resistance) with polyether polyol and polybutadiene polyol (for low-temperature flexibility) in a composite formulation. This composite approach allows the sealant to achieve both high-temperature stability and low-temperature elasticity without becoming brittle at subzero temperatures.
Solution Approach 2:
The patent adjusts the molecular weight and hydroxyl value parameters of the polyester polyol component, and balances it with appropriate ratios of other polyols, to achieve optimal performance across the full temperature range. This parameter optimization prevents brittleness at low temperatures while maintaining high-temperature resistance.
3Ease of operation
If soft polyurethane gel is formulated for ambient temperature, then good viscoelastic properties are achieved, but the gel cannot withstand 120°C heat-aging
Solution Approach 1:
The patent creates a composite polyol system where polyester polyol provides heat-aging resistance, polyether polyol contributes viscoelastic properties, and polybutadiene polyol enhances low-temperature performance. This composite formulation achieves both good viscoelasticity for ease of operation and withstands 120°C heat-aging for one week without degradation.
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 gel formulation ensures consistent sealing performance across extreme temperatures, preventing degradation and maintaining viscoelastic properties, thus effectively sealing against environmental contaminants.
Implementation Method 1
The first polyol is a polybutadiene-based polyol that has a low glass transition temperature that provides excellent low-temperature performance
Implementation Method 2
The second polyol is a polyether polyol, which is very flexible and contributes the necessary viscoelastic properties
Implementation Method 3
The third polyol is butene diol, which is a short molecule that quickly builds up a hard backbone structure that helps promote fast curing and provides resistance to cross-linked network breakage at high temperatures
Data Source
AI summary
A sealant gel for a telecommunication enclosure, wherein the gel is formulated from three different polyols. The first polyol is a polybutadiene-based polyol that has a low glass transition temperature. The second polyol is a polyether polyol. The third polyol is butene diol, which is a short molecule that quickly builds up a hard backbone structure.