EVOH-Polyolefin Resin Composition for Transparency and Impact Resistance
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Solution Overview
Problem
Existing resin compositions containing EVOH and polyolefin resins, particularly those made from recycled materials, suffer from poor compatibility, leading to inadequate transparency and mechanical properties, especially impact resistance.
Innovation Solution
A resin composition comprising EVOH, a polyethylene resin with specific structural units derived from 1-hexene and/or 1-octene, and a polyolefin resin with a polar group, where the polyethylene resin has a weight average molecular weight of 230000 or more and a melt flow rate of 0.15 to 50 g/10 min, and the polyolefin resin has a melt flow rate of 0.15 to 50 g/10 min, enhancing compatibility and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a compatibilizer is added to improve compatibility between EVOH and polyolefin resin, then compatibility is enhanced, but transparency and mechanical properties deteriorate
Solution Approach 1:
The patent uses a specific polyethylene resin as an intermediary substance that mediates between EVOH and other polyolefin resins. This polyethylene resin has a molecular weight of 20,000 to 500,000 and is introduced to improve compatibility without using traditional compatibilizers that harm mechanical properties and transparency. The polyethylene resin acts as a bridge to enhance interfacial adhesion while maintaining the inherent strengths of the component materials.
2Object-generated harmful factors
If recycled EVOH and polyolefin resin are used to reduce waste, then environmental load is reduced, but compatibility and mechanical properties worsen
Solution Approach 1:
The patent recovers and reuses polyethylene resin that would otherwise be discarded, transforming it into a valuable compatibilizing agent. By incorporating this recovered polyethylene resin into the recycled EVOH-polyolefin blend, the patent achieves both waste reduction and improved material compatibility, turning a waste stream into a functional component that enhances performance.
Solution Approach 2:
The patent controls the molecular weight parameter of the polyethylene resin within the specific range of 20,000 to 500,000 to optimize its effectiveness as a compatibilizer. By adjusting this critical parameter, the recovered polyethylene resin achieves optimal balance between compatibility enhancement and maintenance of mechanical properties in the recycled resin composition.
3Stability of the object's composition
If traditional compatibilizers are used to enhance compatibility, then compatibility improves, but transparency deteriorates
Solution Approach 1:
The patent employs polyethylene resin as a transparent intermediary substance that maintains optical clarity while enhancing compatibility. Unlike traditional compatibilizers that often contain additives or have structures that scatter light, the polyethylene resin is inherently transparent and compatible with both EVOH and polyolefin phases, allowing light transmission while achieving interfacial adhesion.
Data Source
AI summary
The following is provided as a resin composition having excellent appearance and mechanical properties even in the case of containing an ethylene-vinyl alcohol copolymer and a polyolefin resin. A resin composition comprising an ethylene-vinyl alcohol copolymer (A), a polyethylene resin (B), and a polyolefin resin (C) having a polar group, wherein the polyethylene resin (B) comprises a structural unit derived from 1-hexene and/or 1-octene, the polyethylene resin (B) has a weight average molecular weight of 230000 or more, and the polyolefin resin (C) having a polar group has a melt flow rate (190° C., load 2160 g) of 0.15 to 50 g/10 min as measured in accordance with JIS K7210: 2014.