Mining Water Pipe Composite Material for Impact and Flame Resistance
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Solution Overview
Problem
Current plastic water pipes used in mining, such as those made from PVC, HDPE, and PP, face issues with impact strength, tensile strength, burst pressure resistance, static pressure resistance, and flame retardancy, with halogenated flame retardants posing hazards in fires.
Innovation Solution
A water pipe composition comprising 58-82 parts by weight of poly(phenylene ether), 8-18 parts by weight of a hydrogenated block copolymer of an alkenyl aromatic monomer and a conjugated diene, 0-15 parts by weight of polystyrene, and 10-20 parts by weight of an organophosphate ester flame retardant, with optional polyolefins, providing improved balance of properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If pipes are made from PVC, then weight is reduced and corrosion resistance is improved, but impact strength deteriorates and brittleness increases
Solution Approach 1:
The patent uses a composite material system consisting of polypropylene as the base polymer, combined with specific elastomeric impact modifiers (ethylene-propylene-diene terpolymer or butadiene-styrene copolymer) and flame retardant additives. This composite approach allows the pipe to achieve both reduced weight and improved impact strength by combining materials with complementary properties.
2Strength
If pipes are made from HDPE or PP, then impact strength and toughness are improved, but burst pressure resistance and static pressure resistance deteriorate
Solution Approach 1:
The patent optimizes the compositional parameters by controlling the weight ratios of polypropylene (50-85 parts), elastomeric impact modifier (5-20 parts), and flame retardant (3-10 parts) per 100 parts of polypropylene. This parameter optimization allows the material to achieve both high impact strength and adequate pressure resistance by balancing the soft elastomeric phase with the rigid polypropylene matrix.
3Reliability
If halogenated flame retardants are incorporated, then flame retardancy is improved, but hazardous gas emission worsens during fire
Solution Approach 1:
The patent converts the potential harm of flame retardant additives by selecting non-halogenated options (such as aluminum hydroxide, magnesium hydroxide, or phosphorus-based flame retardants) that release water vapor or non-toxic gases during combustion instead of hazardous halogenated gases. This transforms the flame retardant function from a harmful to a beneficial effect.
4Stress or pressure
If polypropylene content is increased, then burst pressure resistance is improved, but processing difficulty and extrusion complexity worsen
Solution Approach 1:
The patent uses master batches or pre-compounded pellets containing the flame retardant and impact modifier as intermediary materials. These pre-mixed intermediaries simplify the extrusion process by reducing the number of separate feeding operations needed and ensuring uniform distribution of additives, thereby easing manufacturing while maintaining high polypropylene content for pressure resistance.
Data Source
Figure 1
AI summary
A water pipe for mining operations has an outer diameter of 20 to 200 millimeters and a wall thickness of 2 to 20 millimeters. The water pipe includes a composition containing 58 to 82 parts by weight poly(phenylene ether), 8 to 18 parts by weight of a hydrogenated block copolymer of an alkenyl aromatic monomer and a conjugated diene, 0 to 15 parts by weight of polystyrene selected from the group consisting of homopolystyrenes, rubber-modified polystyrenes, and combinations thereof, and 10 to 20 parts by weight of a flame retardant comprising an organophosphate ester, wherein parts by weight values are based on 100 parts by weight total of the poly(phenylene ether), the hydrogenated block copolymer, the polystyrene, and the flame retardant. The water pipe exhibits a desirable balance of impact strength, tensile strength, burst pressure resistance, static pressure resistance, and flame retardancy.