Fluoro-Rubber Composition Hardness Elongation Balance
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Solution Overview
Problem
Existing fluoro-rubber compositions for oil well drilling fail to achieve a balance between high hardness and high elongation, which are essential for withstanding the harsh drilling conditions of high temperature, high pressure, and acidic environments.
Innovation Solution
A fluoro-rubber composition comprising a fluoro-rubber, hydrophobic silica treated with hexamethyldisilazane or silicone oil, a cross-linking agent, and a cross-linking assistant, with specific ratios and properties to enhance hardness and elongation, while maintaining heat resistance, acid resistance, and oil resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of hydrophobized silica is increased to improve hardness, then the hardness of the molded product is improved, but the elongation decreases
Solution Approach 1:
The patent changes the chemical parameters of the silica surface treatment by specifying hexamethyldisilazane or silicone oil as hydrophobizing agents, and controls the treatment amount within 1-50 parts by mass per 100 parts by mass of fluoro-rubber. This parameter optimization allows achieving both improved hardness and maintained elongation, resolving the contradiction between these two properties.
Solution Approach 2:
The patent creates a composite material system combining fluoro-rubber with specifically treated hydrophobized silica, cross-linking agent, and cross-linking assistant. This composite approach allows the silica to provide hardness enhancement while the fluoro-rubber matrix and cross-linking system maintain elongation properties, thus resolving the contradiction between hardness and elongation.
2Strength
If a highly hard fluoro-rubber is used to meet abrasion resistance requirements, then abrasion resistance is improved, but elongation and flexibility are reduced
Solution Approach 1:
The patent optimizes the silica content parameter within 1-50 parts by mass per 100 parts by mass of fluoro-rubber and controls the cross-linking agent and cross-linking assistant ratios. This parameter optimization achieves high hardness for abrasion resistance while maintaining sufficient elongation through controlled cross-linking density.
Solution Approach 2:
The patent develops a composite fluoro-rubber material containing hydrophobized silica, cross-linking agent, and cross-linking assistant. The synergistic interaction between these components provides both the hardness needed for abrasion resistance and the elongation required for flexibility, resolving the contradiction between these opposing properties.
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 composition results in a cross-linked rubber article with improved hardness and elongation, suitable for high-strength applications in oil well drilling, offering excellent heat resistance, acid resistance, and oil resistance.
Implementation Method 1
the hydrophobic silica is one having hydrophobized with hexamethyldisilazane or silicone oil
Implementation Method 2
a cross-linking agent, and a cross-linking assistant... the content of the cross-linking agent is from 0.1 to 5 parts by mass, and the content of the cross-linking assistant is from 0.1 to 30 parts by mass
Data Source
AI summary
To provide a fluoro-rubber composition whereby good hardness and good elongation are obtainable in a rubber article after cross-linking, and a cross-linked rubber article using the same. A fluoro-rubber composition comprising a fluoro-rubber, a hydrophobic silica and a cross-linking agent, wherein the hydrophobic silica is one having hydrophobized with hexamethyldisilazane or silicone oil, and the content of the hydrophobic silica is from 1 to 50 parts by mass and the content of the cross-linking agent is from 0.1 to 5 parts by mass, per 100 parts by mass of the fluoro-rubber; and a cross-linked rubber article obtained by cross-linking such a fluoro-rubber composition.