Multilayer Mining Pipe Composite Structure
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Solution Overview
Problem
The mining industry faces challenges with metal pipes due to high weight, susceptibility to corrosion, and sparking, while plastic pipes like PVC are brittle, and HDPE/PP pipes lack sufficient burst and static pressure resistance, flame retardancy, and outer surface electrical resistance.
Innovation Solution
A multilayer water pipe with an inner layer composed of poly(phenylene ether), hydrogenated block copolymer, and organophosphate ester, and an outer layer of high density polyethylene, antistatic agent, and flame retardant synergist, providing improved impact strength, tensile strength, burst pressure resistance, static pressure resistance, flame retardancy, and outer surface electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal pipes are used, then strength and pressure resistance are improved, but weight increases and corrosion susceptibility worsens
Solution Approach 1:
The patent employs a composite structure consisting of an inner layer made from poly(phenylene ether) composition and an outer layer made from high density polyethylene composition. This composite material approach combines the advantages of different materials: the inner layer provides high strength and pressure resistance, while the outer layer provides corrosion resistance and reduced weight, achieving an optimal balance between mechanical properties and weight reduction.
2Strength
If metal pipes are used, then strength is improved, but corrosion resistance worsens
Solution Approach 1:
The composite pipe structure separates the functions of strength and corrosion resistance into different layers. The inner layer composed of poly(phenylene ether) provides the necessary mechanical strength, while the outer layer of high density polyethylene provides excellent corrosion resistance, eliminating the corrosion susceptibility inherent in metal pipes while maintaining structural integrity.
3Weight of moving object
If PVC pipes are used, then weight is reduced and corrosion resistance is improved, but impact strength worsens
Solution Approach 1:
The patent changes the material parameters by selecting poly(phenylene ether) as the base polymer for the inner layer, which inherently possesses superior toughness and impact resistance compared to PVC. Additionally, the incorporation of hydrogenated block copolymer as a rubber modifier further enhances impact strength by introducing elastomeric phases that can absorb impact energy, while maintaining the lightweight advantage of plastic materials.
4Strength
If HDPE pipes are used, then impact strength is improved, but burst pressure resistance worsens
Solution Approach 1:
The patent applies local quality by assigning different material compositions to different layers of the pipe. The inner layer uses poly(phenylene ether) with high rigidity and burst pressure resistance, while the outer layer uses high density polyethylene with superior impact strength. This spatial differentiation of material properties allows each layer to excel at its specific function, achieving both high impact resistance and high burst pressure resistance simultaneously.
5Weight of moving object
If conventional plastic pipes are used, then weight is reduced, but flame retardancy worsens
Solution Approach 1:
The patent modifies the chemical composition parameters of the plastic materials to achieve flame retardancy. The poly(phenylene ether) in the inner layer and high density polyethylene in the outer layer are formulated with specific compositions that provide inherent flame resistance. The use of aromatic structures in poly(phenylene ether) and appropriate additive packages enhances the material's ability to resist combustion while maintaining the lightweight advantage of plastic pipes.
6Weight of moving object
If conventional plastic pipes are used, then weight is reduced, but outer surface electrical resistance worsens
Solution Approach 1:
The patent addresses the electrical resistance issue by applying a specialized outer layer composition with high density polyethylene that incorporates additives to enhance electrical resistance properties. This outer layer serves as an electrostatic dissipative surface that prevents static charge accumulation, which is critical in mining environments, while the overall pipe structure remains lightweight due to the plastic material selection.
Data Source
AI summary
A multilayer water pipe for mining operations has an outer layer and an inner layer. The inner layer of the multilayer water pipe includes a composition containing a poly(phenylene ether), a hydrogenated block copolymer of an alkenyl aromatic monomer and a conjugated diene, optionally, a homopolystyrene, a rubber-modified polystyrene, or a combination comprising at least one of the foregoing, and a flame retardant comprising an organophosphate ester. The outer layer of the multilayer water pipe includes a composition containing a high density polyethylene, an antistatic agent, a flame retardant, and a flame retardant synergist. The multilayer water pipe exhibits a desirable balance of impact strength, tensile strength, burst pressure resistance, static pressure resistance, flame retardancy, and outer surface electrical resistance.