Multi-Layer Container Composition for Barrier and Impact Resistance
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Solution Overview
Problem
Existing high-density polyethylene (HDPE) containers for transporting hazardous substances lack sufficient barrier properties and impact resistance, particularly for substances with a flash point ≤60°C, necessitating the development of improved polymer blend compositions for multi-layer containers.
Innovation Solution
A polymer blend composition comprising 78-92% high density polyethylene, 3-10% polyamide homopolymer, 5-10% maleic anhydride grafted polyethylene, and 0-2% antistatic compound, combined with additives, is used to create multi-layer containers with enhanced barrier and impact resistance, utilizing a coextrusion blow molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If HDPE is used for container production, then mechanical properties are good, but barrier properties are insufficient for hazardous substances with flash point ≤60°C
Solution Approach 1:
The patent applies composite materials by combining HDPE with polyamide homopolymer and maleic anhydride grafted polyethylene in a multi-layer structure. This composite approach allows the container to simultaneously achieve good mechanical properties from HDPE and improved barrier properties from the polyamide layer, resolving the contradiction between structural strength and barrier performance for hazardous substances.
Solution Approach 2:
The patent segments the container wall into multiple functional layers: an outer HDPE layer providing mechanical strength and chemical resistance, and an inner polyamide layer providing barrier properties. This segmentation allows each layer to be optimized for its specific function, with the HDPE layer ensuring structural integrity and the polyamide layer preventing substance penetration.
2Reliability
If multi-layer co-extrusion blow moulding is used, then barrier properties are improved, but production complexity and cost increase
Solution Approach 1:
The patent merges the barrier function and structural function into a single integrated multi-layer structure produced by co-extrusion blow moulding. By combining HDPE and polyamide layers in one continuous forming process, the patent achieves improved barrier properties while avoiding the complexity of separate manufacturing and assembly steps, thus reducing overall production complexity.
Solution Approach 2:
The multi-layer container structure serves multiple functions simultaneously: the HDPE layer provides mechanical strength and chemical resistance, while the polyamide layer provides barrier properties. This multi-functionality is achieved through a single co-extrusion process, eliminating the need for separate production lines and reducing operational complexity.
3Stability of the object's composition
If additional adhesive layers are added to improve layer adhesion, then bonding between layers improves, but device complexity and production cost increase
Solution Approach 1:
The patent uses maleic anhydride grafted polyethylene as an intermediary layer between the HDPE and polyamide layers. This compatibilizer acts as a mediator that chemically bonds to both HDPE and polyamide, providing strong interlayer adhesion without requiring additional adhesive layers. The MAgPE layer integrates seamlessly with both materials, achieving stable composition while minimizing structural complexity.
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 multi-layer containers exhibit superior barrier properties and chemical resistance, effectively containing hazardous substances like petroleum-based products and solvents, with improved adhesion between layers without additional adhesives, and are cost-effective to produce.
Implementation Method 1
Said inner layer comprises a polyamide homopolymer and a maleic anhydride grafted polyethylene (MAgPE) coupling agent
Data Source
AI summary
A multi-layer container may include: a barrier layer made of polymer blend composition and at least one further layer including high density polyethylene. The polymer blend composition may include: 78-92% by weight of a homopolymer or copolymer of ethylene; 3-10% by weight of a polyamide homopolymer; 5-10% by weight of maleic anhydride grafted polyethylene; and 0-2% by weight of a first antistatic compound on a total weight of the polymer blend composition, in combination with first additives. The multi-layer container may have a thickness greater than or equal to 1.5 millimeters (mm) and less than or equal to 2.5 mm, a volume greater than or equal to 800 liters and less than or equal to 1,200 liters, or both.