Epoxy Casting Resin Formulation for Water-Resistant Cable Joint Insulation
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Solution Overview
Problem
Current polyurethane casting resins used for electrical insulation of cable joints are sensitive to water, leading to foaming issues and health concerns due to isocyanate-based hardeners, and face challenges with temperature variations affecting curing time, which can result in insufficient insulation and costly repairs.
Innovation Solution
A curable two-component epoxy resin precursor system comprising an epoxy resin, amine-based epoxy curing agents, mineral filler, phenolic lipid, and triphenylmethane dye, which provides improved handling, mechanical, and electrical properties, including resistance to water and reduced exothermic heat, allowing for reliable on-site insulation of cable joints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyurethane casting resins with isocyanate-based hardeners are used for cable joint insulation, then the resins exhibit low viscosity and fast curing, but the resins are sensitive to water causing foaming and present health concerns
Solution Approach 1:
The patent changes the chemical composition parameters by replacing isocyanate-based hardeners with amine-based epoxy curing agents. This fundamental parameter change eliminates water sensitivity and foaming while maintaining low viscosity and fast curing properties through careful selection of epoxy resin and curing agent ratios
Solution Approach 2:
The patent uses composite material formulation combining epoxy resin with amine-based curing agents, mineral fillers, and phenolic lipids. This composite approach creates a resin system that integrates multiple beneficial properties: water resistance from epoxy chemistry, controlled viscosity from resin composition, and fast curing from amine catalysts
2Reliability
If polyurethane casting resins are modified to increase hydrophobicity, then the resins can cure in the presence of water, but foaming may still occur under certain circumstances
Solution Approach 1:
The patent extracts the problematic isocyanate component from the resin system and replaces it with epoxy resin and amine-based curing agents. This removal of the water-reactive isocyanate eliminates the source of foaming while maintaining the ability to cure in humid conditions through the epoxy-amine reaction mechanism
3Reliability
If isocyanate-based hardeners are used in casting resins, then the resins achieve suitable curing properties, but health and safety concerns arise due to carcinogenic properties
Solution Approach 1:
The patent converts the harmful isocyanate chemistry into beneficial epoxy-amine chemistry. The amine-based curing agents provide effective curing properties while being significantly safer for human health and environmental compatibility, transforming a hazardous system into a safe one
4Adaptability or versatility
If temperature variations occur on construction sites, then curing time becomes difficult to predict, but cable joints must remain stationary until fully cured
Solution Approach 1:
The patent incorporates visual indicators that provide real-time feedback on the curing progress. This allows workers to monitor the curing state directly and determine when the joint is ready for movement, eliminating the need to rely solely on temperature-based time predictions and providing clear visual confirmation of curing completion
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 epoxy resin system offers enhanced shelf-life, easy mixing and pouring, resistance to water, reduced thermal damage, and visual monitoring of mixing and curing, ensuring effective electrical insulation and mechanical protection of cable joints without foaming or health hazards.
Implementation Method 1
at least one of part (A) and part (B) comprises at least one triphenylmethane dye
Implementation Method 2
a first part (A) comprising: at least one epoxy resin; a second part (B) comprising: at least one first amine-based epoxy curing agent
Implementation Method 3
reduced generation of exothermic heat
Data Source
AI summary
The present disclosure provides a curable casting resin precursor, comprising (a) a first part (A) comprising: (a1) at least one epoxy resin; (b) a second part (B) comprising: (b1) at least one first amine-based epoxy curing agent; (b2) optionally, at least one second amine-based epoxy curing agent; (b3) at least one mineral filler; (b4) at least one phenolic lipid; wherein part (A) and/or part (B) comprise at least one triphenylmethane dye. The curable casting resin precursor is suited for encapsulating metal parts such as cable joints and the like.