Nitrile Rubber Fluid Hose Ozone Resistance
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Solution Overview
Problem
Diene rubber hoses suffer from poor ozone resistance and extraction resistance when used with solvents, leading to degradation and cracking, and existing solutions compromise between ozone resistance and extraction resistance.
Innovation Solution
A fluid hose composed of nitrile rubber with a specific modulus range, containing carbon black and excluding paraffin wax, enhances ozone and extraction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paraffin wax is added to diene rubber to improve ozone resistance, then ozone resistance is improved, but extraction resistance deteriorates because paraffin wax is extracted into solvents
Solution Approach 1:
The invention changes the chemical composition parameters by selecting nitrile rubber with specific acrylonitrile content (30-45 mass%) and specific modulus (0.15-0.45 MPa), and adjusting carbon black content (50-150 parts by mass per 100 parts rubber), to achieve both ozone and extraction resistance without paraffin wax
Solution Approach 2:
The invention uses a composite material system combining nitrile rubber with carbon black and specific additives, creating a material that inherently provides both ozone resistance and extraction resistance, eliminating the need for paraffin wax
2Strength
If diene rubber is used to achieve good wear resistance, then wear resistance is improved, but ozone resistance deteriorates leading to degradation and cracking
Solution Approach 1:
The invention changes the base rubber material from diene rubber to nitrile rubber with specific acrylonitrile content (30-45 mass%), which inherently provides both wear resistance and ozone resistance, eliminating the contradiction between these properties
Data Source
Figure 1
AI summary
Provided is a fluid hose having excellent ozone resistance and extraction resistance. This fluid hose is made of a nitrile-based rubber composition containing nitrile rubber (A) as a main component, wherein a modulus (M10) of the nitrile-based rubber composition is 0.1-0.5 MPa, and the nitrile-based rubber composition does not contain paraffin wax.