Biodiesel-Resistant PVC/NBR Fuel Hose Composition
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Solution Overview
Problem
Traditional rubber-based materials used in automotive components, such as fuel filler hoses, degrade and swell when exposed to biodiesel blends, leading to loss of mechanical properties and inadequate electrical resistivity, which is a concern for compatibility with biodiesel fuels.
Innovation Solution
A PVC/NBR rubber composition is developed, incorporating conductive carbon black, synthetic amorphous silica, and graphene oxide, with specific ratios and additives to achieve high tensile strength, resistance to biodiesel blends, and electrical resistivity below 1×10^6Ω, ensuring compatibility with biodiesel fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rubber-based materials are used in fuel filler hoses, then the hoses can be manufactured with conventional materials and processes, but the materials degrade and swell when exposed to biodiesel blends, leading to loss of mechanical properties and inadequate electrical resistivity
Solution Approach 1:
The patent uses a composite material system consisting of NBR/PVC polyblend combined with multiple types of carbon black (conductive carbon black, channel black, furnace black) and synthetic amorphous silica. This multi-component composite provides both biodiesel resistance and maintains mechanical strength, resolving the contradiction between reliability and strength.
Solution Approach 2:
The patent specifies precise compositional parameters including 33-45 ACN content in NBR, specific PHR ranges for each carbon black type (e.g., 20-50 PHR conductive carbon black, 10-40 PHR channel black), and silica content (5-30 PHR). These parameter controls ensure the material maintains both biodiesel resistance and tensile strength.
2Reliability
If traditional rubber-based materials are used in fuel filler hoses, then the hoses can be manufactured with conventional materials and processes, but the materials exhibit inadequate electrical resistivity when exposed to biodiesel blends
Solution Approach 1:
The patent incorporates conductive carbon black (20-50 PHR) specifically selected for its electrical conductivity properties alongside other carbon black types and silica. This composite approach maintains electrical resistivity below 1×10^6Ω while the crosslinked NBR/PVC matrix resists biodiesel degradation.
Solution Approach 2:
The patent controls the ACN content parameter of NBR at 33-45%, which optimizes both the electrical properties and chemical resistance. Additionally, the specific ratio of conductive to non-conductive carbon black is controlled to achieve the required electrical resistivity while maintaining biodiesel resistance.
3Ease of manufacture
If conventional carbon black is used in the rubber composition, then the manufacturing process is simple, but the electrical resistivity requirement of less than 1×10^6Ω cannot be met
Solution Approach 1:
The patent uses a composite of three different carbon black types (conductive, channel, and furnace black) in specific ratios. This composite provides the necessary electrical conductivity while maintaining ease of manufacture through standard rubber compounding and mixing processes.
Solution Approach 2:
The patent specifies the conductive carbon black should have a nitrogen surface area of 155 m2/g and mean particle size of 22 nm, with OAN oil absorption of 113 cc/100 gm. These parameter specifications ensure the material meets electrical resistivity requirements while being manufacturable with conventional equipment.
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 maintains mechanical properties and electrical resistivity, providing a durable and resistant fuel filler hose that withstands biodiesel blends from B6 to B30, with improved tensile strength, elongation, and stability, meeting automotive industry requirements.
Implementation Method 1
The composition has electrical resistivity of less than 1×10^6Ω measured according to SAE J2260. The component (B) may have a nitrogen surface area of about 155 m2/g. The component (B) may have a mean particle size of about 22 nm. The component (B) may have OAN oil absorption of about 113 cc/100 gm according to D2414.
Implementation Method 2
The composition may further include at least one of: (E) 0-30 PHR reinforcing agent(s); (F) 0-20 PHR coupling agent(s). The hose may have a tensile strength at break of at least 22 MPa measured according ASTM D412.
Implementation Method 3
Traditional automotive component materials, developed for fossil fuels, may not provide satisfactory results when biodiesel blends are utilized as fuel. The composition maintains mechanical properties and electrical resistivity, providing a durable and resistant fuel filler hose that withstands biodiesel blends from B6 to B30.
Data Source
AI summary
A PVC/NBR rubber composition includes (A) 100 PHR polyblend (33-45 ACN) PVC/NBR, (B) 20-50 PHR conductive carbon black, (C) 1-100 PHR carbon black, (B) being more electrically conductive than (C), and (D) 5-30 PHR synthetic amorphous silica, wherein the rubber composition has electrical resistivity of less than 1×106Ω measured according to SAE J2260.