Ambient-Cure Coatings for High-Temperature Overhead Conductors
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Solution Overview
Problem
There is a need for overhead conductors with high-temperature resistant and water-aging resistant coatings that can be formed from single-part, water-based compositions curable at ambient temperatures, and that exhibit long-term thermal resistance exceeding 150 °C.
Innovation Solution
An overhead conductor coated with a cured composition containing silicon dioxide, acrylates, titanium dioxide, and a metal from Groups IA-IIIA of the periodic table, applied using a single-part coating dispersion that cures at ambient temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional coatings are used to reduce operating temperature and improve durability, then heat emissivity increases and conductor durability improves, but the coatings require multi-part compositions and high-temperature curing processes that are complex and time-consuming
Solution Approach 1:
The patent combines multiple coating components (silicon dioxide, metal silicate, acrylate, titanium dioxide) into a single-part water-based composition that can be applied and cured in one process, eliminating the need for separate application and curing steps required by conventional multi-part coatings
Solution Approach 2:
The patent changes the curing temperature parameter from high-temperature curing (conventional) to ambient temperature curing (invention), enabling simpler processing without requiring complex heating equipment or extended curing cycles
2Temperature
If conventional coatings are applied to increase heat emissivity, then conductor operating temperature decreases, but the coatings lack long-term thermal resistance at temperatures exceeding 150 °C
Solution Approach 1:
The patent uses a composite material system consisting of silicon dioxide (30-65 wt%), metal silicate (10-40 wt%), acrylate (5-20 wt%), and titanium dioxide (5-30 wt%) that provides both high heat emissivity and long-term thermal stability at temperatures exceeding 150 °C
Solution Approach 2:
The patent optimizes the local composition properties by adjusting the ratios of different components (e.g., silicon dioxide content for thermal stability, titanium dioxide for heat radiation) to achieve both high heat emissivity and sustained thermal resistance under varying temperature conditions
3Ease of manufacture
If single-part water-based compositions are used for coating, then application simplicity and ambient curing are achieved, but the coatings lack high-temperature resistance and water-aging resistance
Solution Approach 1:
The patent formulates a composite water-based composition containing silicon dioxide, metal silicate, acrylate, and titanium dioxide that maintains both ease of application and high performance, achieving thermal resistance up to 250 °C and water-aging resistance at 90 °C for extended periods
Solution Approach 2:
The patent modifies the chemical composition parameters of the water-based coating to include specific ratios of thermally stable components (silicon dioxide 30-65 wt%, metal silicate 10-40 wt%) that enable the coating to withstand high temperatures and water aging while remaining applicable at ambient conditions
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 coated conductor achieves thermal resistance up to 250 °C for 7 days and water resistance at 90 °C for 7 days, while passing Mandrel Bend and Fingernail Scratch tests after heat and water aging.
Implementation Method 1
the need for overhead conductors having high-temperature resistant and water-aging resistant coatings... that exhibit long-term thermal resistance at temperatures that exceed 150 °C
Implementation Method 2
The coated conductor achieves thermal resistance up to 250 °C for 7 days
Implementation Method 3
water resistance at 90 °C for 7 days
Data Source
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AI summary
An overhead conductor includes a bare conductor coated with a cured coating composition formed from a single-part coating dispersion. The cured coating composition includes silicon dioxide or derivatives thereof, one or more metals from Groups IA-IIIA of the periodic table, one or more acrylates, titanium dioxide, and optionally, barium sulfate. A method of making a coated overhead conductor includes preparing the single-part coating dispersion, applying the coating dispersion to a bare conductor, and curing the coating dispersion to form the coated overhead conductor. The single-part coating dispersion includes silicon dioxide, one or more metal silicates, one or more acrylates, titanium dioxide, water, and optionally, barium sulfate.