Epoxy Cable Sealing Composition Rapid Curing
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Solution Overview
Problem
Existing sealing methods for coated electric cables, particularly using thermosetting resins, face challenges in achieving efficient curing at high temperatures due to viscosity issues, leading to prolonged hardening times and reduced production efficiency.
Innovation Solution
A coated electric cable sealing composition comprising an epoxy component with 4 or less epoxy groups, a curing component such as an amine or mercapto compound, and a reactive diluent, which hardens within 10 minutes at 130°C, ensuring permeation into narrow gaps and improved productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermosetting resin is cured at high temperature to improve productivity, then curing speed increases, but resin viscosity rises sharply during curing preventing sufficient permeation into narrow gaps
Solution Approach 1:
The patent changes the chemical composition parameters of the thermosetting resin, specifically using epoxy resins with lower epoxy equivalent weights and controlling the epoxy-to-curing-agent ratio, to achieve faster curing kinetics at high temperatures without excessive viscosity increase, enabling both high-speed curing and complete gap permeation
2Manufacturing precision
If thermosetting resin viscosity is kept low to ensure permeation into narrow gaps, then sealing completeness improves, but curing time increases reducing productivity
Solution Approach 1:
The patent modifies the resin system parameters by selecting specific epoxy resin types (with lower epoxy equivalents) and optimizing the curing agent ratio, which fundamentally changes the curing kinetics to achieve rapid gelation and hardening even at low viscosities, thus maintaining short curing times while ensuring complete permeation
Solution Approach 2:
The patent creates a composite resin system combining specific epoxy resins with curing agents in optimized ratios, where the synergistic interaction between components provides both low initial viscosity for permeation and rapid curing rate for high productivity
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 sealing composition maintains excellent sealing performance under cooling-heating cycles and high temperature and humidity conditions while achieving rapid hardening, enhancing production efficiency and ensuring airtightness in coated electric cables.
Implementation Method 1
the thermosetting resin can be cured at a relatively high temperature in the viewpoint of raising productivity
Implementation Method 2
the coated electric cable sealing composition is heated to be cured
Implementation Method 3
the thermosetting resin needs to sufficiently permeate into narrow gaps such as the gap between the core wires in the core wires connection section, the gap between the coated electric wires, and the gap between each core wire and its coating
Data Source
AI summary
A sealing composition and a sealing method for a coated electric cable have excellent sealing performance even under conditions such as cooling-heating cycles or high temperature and humidity. The coated electric cable sealing composition is for sealing a core wires connection section formed by electrically connecting multiple core wires exposed from multiple coated electric wires, and features having a hardening time of 10 minutes or less at 130° C., and permeating to inside of the coated electric wires at a height of 5 mm or more at the time point of hardening while the exposed parts of the core wires including the core wires connection section and the boundary part between the coated parts and the exposed parts of the core wires are immersed perpendicularly in the coated electric cable sealing composition filled in a resin cap and the sealing composition is heated to be cured.