Fire-Resistant Rubber Hose Composition With Maintained Burst Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current railway hoses face challenges in meeting stringent fire safety standards like EN 45545-2 while maintaining conventional performance criteria such as burst pressure, cold flexibility, and oil resistance, as increased fire-retarding additives often compromise physical properties.
Innovation Solution
The development of reinforced hoses with a tube and cover layers composed of elastomeric blends like chlorinated polyethylene and chlorosulphonated polyethylene, or ethylene vinyl acetate rubber, combined with a flame-resistant composition and curing system, which includes ingredients like antimony oxide and silica, to meet EN 45545-2 and EN854 type 2TE standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fire-retarding additives are increased to meet fire safety standards, then fire resistance is improved, but physical properties deteriorate
Solution Approach 1:
The patent uses composite rubber formulations combining multiple elastomers (EPDM, NBR, SIR) with specific fire-retarding additives (antimony oxide, zinc borate, magnesium hydroxide) to achieve both fire resistance and maintained physical properties. The composite approach allows synergistic effects where each component contributes to either fire safety or mechanical performance
Solution Approach 2:
The patent optimizes the concentrations and ratios of fire-retarding additives to achieve the required fire resistance while minimizing negative impacts on physical properties. Specific parameter ranges are established for additives like antimony oxide (2-5 phr) and zinc borate (5-15 phr) to balance fire safety with mechanical performance
2Reliability
If fire-retarding additives are increased to meet fire safety standards, then fire resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent develops universal rubber compositions that simultaneously satisfy multiple requirements: fire resistance (EN 45545-2), mechanical strength, flexibility, and processability. The formulated compounds serve multiple functions through integrated design of elastomer blends and additive packages, reducing the need for separate optimization of each property
3Reliability
If fire-retarding additives are increased to meet fire safety standards, then fire resistance is improved, but processing difficulty increases
Solution Approach 1:
The patent carefully controls the dosage and combination of fire-retarding additives to maintain proper processing characteristics. The formulation parameters are optimized to ensure the rubber remains processable through standard extrusion and molding operations while achieving the required fire resistance levels
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 hoses achieve high fire resistance, low smoke density, and maintain excellent physical properties, including burst pressure and flexibility, while adhering to stringent fire safety and performance standards.
Implementation Method 1
a peroxide/sulfur curing system
Implementation Method 2
The flame-resistant package may include one or more ingredients selected from the group consisting of antimony oxide, zinc molybdate/magnesium silicate complex, magnesium aluminum hydroxy carbonate, and aluminum trihydroxide
Data Source
AI summary
Hoses include a tube, a reinforcement layer disposed outwardly from the tube, and a cover layer disposed outwardly from the reinforcement layer. The cover layer may be based on a first elastomeric blend of a first chlorinated polyethylene and chlorosulphonated polyethylene, a first flame-resistant composition, and a peroxide/sulfur curing system. The tube may be based upon a second elastomeric blend of a second chlorinated polyethylene and ethylene vinyl acetate rubber, a second flame-resistant composition, and a peroxide curing system. The first flame-resistant package and the second flame-resistant package includes one or more ingredients selected from the group consisting of antimony oxide, zinc molybdate/magnesium silicate complex, magnesium aluminum hydroxy carbonate, and aluminum trihydroxide. In some aspects, the hoses meet the testing performance requirements of EN 45545-2, HL2/R22 category standard, and EN854 type 2TE standard.