Multimodal Polyethylene Blend for Drip Irrigation Pipe Kinking Resistance
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Solution Overview
Problem
Current polymer compositions for drip irrigation pipes fail to achieve optimal water flow discharge performance and processing behavior, particularly in the in-line production process, leading to issues with emitter adherence and kinking during use.
Innovation Solution
A polymer composition comprising a blend of multimodal ethylene polymer, another ethylene polymer produced with either a coordination catalyst or high pressure radical initiator, and carbon black, with specific weight ratios and melt flow rates, enhancing the adherence of emitters and reducing kinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymer compositions are used for in-line production, then production can proceed with standard materials, but emitter adherence is insufficient and water flow discharge performance is poor
Solution Approach 1:
The patent uses a composite polymer composition consisting of at least two different polyethylene resins with specific density and MFR ranges, along with carbon black and optional additives. This composite material provides both sufficient emitter adherence and acceptable processing behavior, resolving the contradiction between reliability and ease of manufacture.
Solution Approach 2:
The patent specifies precise parameter ranges for the polyethylene resins including density (0.910-0.960 g/cm³), MFR at 190°C and 2.16 kg (0.1-10.0 g/10 min), and MFR at 190°C and 5.0 kg (0.5-20.0 g/10 min). By controlling these parameters within specific ranges, the composition achieves optimal balance between emitter adherence and processing behavior.
2Productivity
If polymer composition is optimized for water flow discharge, then discharge performance improves, but processing behavior deteriorates
Solution Approach 1:
The patent optimizes the melt flow rate parameters within specific ranges: MFR at 190°C and 2.16 kg between 0.1-10.0 g/10 min and MFR at 190°C and 5.0 kg between 0.5-20.0 g/10 min. These parameter controls enable good water flow discharge performance while maintaining acceptable processing behavior during extrusion.
Solution Approach 2:
The combination of multiple polyethylene resins with different properties creates a composite material that balances water flow discharge performance with processing behavior. The synergistic effect of the resin blend achieves both productivity and ease of manufacture.
3Productivity
If production rate is increased, then productivity improves, but emitter adherence and positioning precision deteriorate
Solution Approach 1:
The patent specifies MFR ranges that balance production rate with emitter positioning precision. The controlled melt flow characteristics ensure that even at higher production rates, the polymer maintains sufficient viscosity and adhesion properties for precise emitter placement during the extrusion process.
4Quantity of substance
If pipe wall is made thin to reduce material use, then material consumption decreases, but kinking resistance deteriorates
Solution Approach 1:
The composite polymer composition provides enhanced mechanical properties including improved kinking resistance even in thin-walled pipes. The combination of multiple polyethylene resins creates a material structure that resists deformation and kinking while maintaining thin wall thickness for reduced material consumption.
Solution Approach 2:
The specific density range (0.910-0.960 g/cm³) and molecular weight distribution characteristics of the polyethylene resins contribute to improved structural integrity and kinking resistance in thin-walled pipes, allowing material consumption to be reduced without sacrificing strength.
Data Source
AI summary
The present application relates to a polymer composition as defined in claims comprising (A) a polymer base resin, which comprises a blend of (A-1) a multimodal ethylene polymer and (A-2) an ethylene polymer, and carbon black, a drip irrigation pipe comprising said polymer composition, a process for producing said drip irrigation pipe, pellets comprising said polymer composition and the use of said polymer composition for producing said drip irrigation pipe.