Polyacetal Resin Composition for Fuel Pump Acid Resistance
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Solution Overview
Problem
Vehicle fuel pump modules made of traditional polyacetal resins are prone to cracking in environments with sulfur, necessitating the development of polyacetal resin compositions with enhanced acid resistance.
Innovation Solution
A polyacetal resin composition incorporating ultrahigh-molecular-weight polyethylene, metal oxides such as calcium stearate, magnesium stearate, or zinc stearate, and additives like boron nitride and radical capture agents, which improve mechanical properties and acid resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polyacetal resin is used for fuel pump modules, then mechanical properties and chemical resistance are good, but acid resistance deteriorates in sulfur-containing environments
Solution Approach 1:
The patent applies composite materials by combining polyacetal resin with ultrahigh-molecular-weight polyethylene (UHMWPE) and metal oxide particles to create a composite resin composition. This composite structure provides both the mechanical properties of polyacetal and the acid resistance of UHMWPE, while metal oxide particles further enhance chemical stability. The composite approach directly addresses the cracking issue in sulfur environments by creating a multi-material system with complementary properties.
Solution Approach 2:
The patent changes the molecular weight parameter of the polyethylene component by selecting ultrahigh-molecular-weight polyethylene (UHMWPE) with specifically controlled molecular weight and melt flow index. This parameter change significantly improves acid resistance while maintaining processability. The precise control of molecular weight parameters allows optimization of both mechanical strength and chemical resistance.
2Reliability
If polyacetal resin composition is optimized for acid resistance, then weight retention rate improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by adding metal oxide particles specifically to enhance acid resistance in regions where chemical exposure occurs, while maintaining the base polyacetal structure for mechanical strength. The ultrahigh-molecular-weight polyethylene is distributed throughout the matrix to provide localized protection against acid attack. This targeted enhancement achieves high weight retention rates without requiring complete redesign of the entire material system.
Solution Approach 2:
The patent optimizes the melt flow index parameter of the polyethylene component to ensure proper processability during injection molding. By controlling the melt flow index within a specific range, the patent maintains ease of manufacture despite the complex multi-component composition. This parameter optimization allows standard manufacturing processes to be used while achieving superior acid resistance.
Data Source
AI summary
Disclosed herein are a novel polyacetal resin composition and a vehicle fuel pump module made of the same with excellent acid resistance.