Polyethylene Fiber Molecular Weight Control for Durable Coolness
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Solution Overview
Problem
Conventional polyethylene fibers with high thermal conductivity for coolness have limited improvements and require additional cooling agents, leading to increased production time and cost, and their cooling effect diminishes with friction or washing, while inorganic materials lack indoor cooling efficacy and fail to effectively emit internal body heat.
Innovation Solution
A polyethylene fiber is developed with controlled number-average molecular weight (Mn) of 20,000 to 30,000 and Z-average molecular weight (Mz) of 130,000 to 300,000, with a ratio (Mz/Mn) of 5.5 to 10, achieving improved coolness, flexibility, and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyethylene fibers with high thermal conductivity are used, then cooling function is provided, but the cooling effect diminishes with friction or washing and requires additional cooling agents
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight distribution of polyethylene resin, specifically setting Mn between 20,000-30,000 and Mz between 130,000-300,000 with Mz/Mn ratio of 5.5-10. This molecular-level parameter optimization enhances thermal conductivity and cooling function durability without requiring additional cooling agents or complex post-processing, directly resolving the contradiction between durability and production complexity
Solution Approach 2:
The patent extracts and eliminates the need for additional cooling agents and post-processing steps by optimizing the intrinsic properties of polyethylene resin itself. By focusing on molecular weight control rather than adding external functional materials, the invention simplifies the production process while maintaining durable cooling effects, addressing the contradiction between reliability and device complexity
2Object-affected harmful factors
If inorganic materials are added to fibers for cooling function, then ultraviolet and infrared ray blocking is improved, but indoor cooling efficacy is lacking and production cost increases
Solution Approach 1:
The patent applies self-service by enabling polyethylene resin to inherently provide cooling functionality through optimized molecular weight distribution. The resin itself, when processed with Mn of 20,000-30,000 and Mz of 130,000-300,000, achieves superior thermal conductivity and cooling effects without needing inorganic material additives, thereby reducing production cost and simplifying manufacturing while maintaining protection against harmful rays
Solution Approach 2:
The patent creates an optimized composite structure at the molecular level within the polyethylene resin itself, rather than physically compositeing inorganic materials. The controlled molecular weight distribution creates an internal structure that provides both cooling function and UV/IR blocking capabilities, eliminating the need for separate inorganic additive processes and reducing manufacturing complexity
3Temperature
If molecular weight of polyethylene resin is optimized, then feeling of coolness is improved, but fiber strength may be reduced
Solution Approach 1:
The patent applies parameter changes by optimizing not just the average molecular weight but the entire molecular weight distribution profile, controlling both Mn (20,000-30,000) and Mz (130,000-300,000) with a specific Mz/Mn ratio (5.5-10). This dual-parameter control ensures sufficient chain length for strength while maintaining short chains for mobility and thermal conductivity, resolving the contradiction between coolness and strength
Solution Approach 2:
The patent applies local quality by creating different molecular weight segments within the polymer structure. The molecular weight distribution includes lower molecular weight portions that provide thermal conductivity and coolness, and higher molecular weight portions that maintain fiber strength and integrity. This local differentiation of molecular characteristics within the single polymer material resolves the strength-coolness contradiction
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 fiber exhibits enhanced coolness, flexibility, and manufacturing efficiency, maintaining cooling properties without additional agents, suitable for clothing and other applications.
Implementation Method 1
a polyethylene fabric using polyethylene yarn... discloses a polyethylene yarn having feeling of coolness through high thermal conductivity of a high-density polyethylene resin
Data Source
AI summary
The present invention relates to a polyethylene fiber having improved feeling of coolness, the polyethylene fiber comprising a polyethylene resin having number-average molecular weight (Mn) of 20,000 to 30,000 and Z-average molecular weight (Mz) of 130,000 to 300,000. The feeling of coolness is enhanced by controlling the number-average molecular weight and Z-average molecular weight for the feeling of coolness of polyethylene resin, and processability and flexibility are improved to thus render the polyethylene fiber suitable as clothing.