Polyethylene Resin Composition for Rapid Additive Bleeding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bleeding additives in polyethylene resin compositions, such as lubricants, exhibit their properties slowly, particularly with high molecular weights, requiring significant time for sufficient surface bleeding, which hinders their effective functionality in applications like containers and films.
Innovation Solution
A polyethylene resin composition combining high pressure process low-density polyethylene as the main polymer with metallocene-type low-density polyethylene or high pressure process low-density polyethylene as sub-polymers, blended with a bleeding additive, enhances the bleeding rate of additives to the surface, facilitating quicker property exhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high molecular weight bleeding additives are used in polyethylene resin, then the lubricant effectiveness is improved, but the bleeding rate to the surface is significantly reduced
Solution Approach 1:
The patent changes the molecular weight parameter of the polyethylene resin from conventional high molecular weight to specifically low molecular weight (MFR ≥ 2.0 g/10min), which fundamentally alters the bleeding kinetics. This parameter change enables high molecular weight lubricants to bleed to the surface rapidly while maintaining their lubricating effectiveness, resolving the contradiction between lubricant effectiveness and bleeding rate.
2Stability of the object's composition
If conventional polyethylene resin is used with bleeding additives, then the resin structure is stable, but the additives take considerable time (up to one month) to bleed to the surface
Solution Approach 1:
The patent applies parameter change by selecting polyethylene with specifically low molecular weight and high MFR (≥ 2.0 g/10min), which fundamentally changes the resin's physical properties. This enables bleeding additives to reach the surface within days rather than weeks or months, while the resin maintains sufficient structural stability for container formation and use.
3Speed
If low molecular weight polyethylene is used to increase bleeding rate, then the bleeding speed is improved, but the formability and mechanical properties deteriorate
Solution Approach 1:
The patent optimizes the molecular weight parameter to a specific range that balances bleeding rate and formability. By selecting polyethylene with MFR ≥ 2.0 g/10min (specifically 2.0-20.0 g/10min in preferred embodiments), the patent achieves rapid bleeding while maintaining adequate viscosity and melt strength for container formation processes.
Solution Approach 2:
The patent creates a composite resin system by blending polyethylene of controlled low molecular weight with bleeding additives (0.1-5.0 parts by weight per 100 parts resin). This composite structure enables the resin to exhibit both rapid bleeding characteristics and sufficient mechanical properties for practical applications.
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
This composition significantly accelerates the bleeding of additives to the surface, allowing their properties to be exhibited in a matter of days instead of weeks or months, thereby improving the performance and functionality of polyethylene-based containers and films.
Implementation Method 1
The bleeding additives to be bled in the surface of the resin
Data Source
AI summary
A polyethylene resin composition which permits the bleeding additive contained therein to be bled at an increased rate even if it has a large molecular weight and, therefore, permits the bleeding agent to be bled to the surface of the resin in an amount sufficient for exhibiting its properties.The polyethylene resin composition comprises, as a main polymer (A), a high pressure process low-density polyethylene and, as a sub-polymer (B), at least one kind of polyethylene selected from the group consisting of a metallocene-type low-density polyethylene and a high pressure process low-density polyethylene having an MFR larger than that of the main polymer (A), the polyethylene resin composition being, further, blended with a bleeding additive.