Cable Filler Gel Composition for Water Blocking and Heat Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gel compositions for cable filling materials, while providing some protection and water prevention, lack sufficient viscosity and temperature stability to ensure they remain in place and prevent water ingress even when the protective tube or cable is damaged.
Innovation Solution
A gel composition comprising a hydrogenated diblock copolymer derived from an aromatic vinyl compound and a conjugated diene compound, combined with a base oil, which allows for easy filling and maintains viscosity and water barrier properties across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gel composition is used as cable filling material, then water penetration is prevented and cable protection is provided, but the material may flow out when the protective tube is damaged and temperature stability is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the gel by using a hydrogenated block copolymer with specific polymer block content (38-45% by mass) and specific molecular weight characteristics. This compositional parameter change results in improved temperature stability and higher dropping point while maintaining water prevention capability
Solution Approach 2:
The patent creates a composite gel composition by combining the hydrogenated block copolymer with base oil in specific proportions (1-20 parts by mass copolymer per 100 parts total). This composite material approach provides both water prevention properties and enhanced temperature stability that neither component achieves alone
2Reliability
If a gel composition with high viscosity is used to prevent flow out, then material retention is improved, but ease of filling during cable manufacturing decreases
Solution Approach 1:
The patent utilizes the viscoelastic nature of the gel composition, which exhibits dynamic viscosity characteristics that allow it to flow easily under manufacturing conditions (when being filled) but maintains its shape and resists flow under static conditions (after filling). This dynamic property resolution enables both easy filling and material retention
Solution Approach 2:
The patent optimizes the molecular weight and molecular weight distribution parameters of the hydrogenated block copolymer to achieve the desired balance between fillability and retention. The specific polymer block content (38-45%) and molecular weight characteristics create a gel that is pumpable during manufacturing yet remains in place afterward
3Temperature
If the dropping point is increased to prevent flow at high temperature, then temperature resistance is improved, but the gel may become too viscous for easy filling
Solution Approach 1:
The patent carefully adjusts the polymer block content parameter (38-45% by mass) and molecular weight parameters of the hydrogenated block copolymer to achieve an optimal balance. These parameter changes raise the dropping point for high-temperature resistance while maintaining viscosity within fillable ranges during manufacturing
Solution Approach 2:
The patent creates local quality differences within the gel structure through the block copolymer architecture, where different polymer blocks provide different functional properties. This structural differentiation allows the gel to exhibit appropriate viscosity at processing temperatures while maintaining high dropping point for temperature resistance
Data Source
AI summary
A gel composition is a gel composition containing a base oil (a) and a hydrogenated block copolymer (b), wherein the hydrogenated block copolymer (b) is a hydrogenated product of a diblock copolymer composed of a polymer block (A) consisting mainly of a structural unit derived from an aromatic vinyl compound and a polymer block (B) consisting mainly of a structural unit derived from a conjugated diene compound, the content of the polymer block (A) in the hydrogenated block copolymer (b) being 38.0 to 45.0% by mass; and the content of the hydrogenated block copolymer (b) in the gel composition is 1 to 20 parts by mass based on 100 parts by mass of the total amount of the base oil (a) and the hydrogenated block copolymer (b).