EVOH-Polyethylene 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, such as 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 the appearance (transparency) and mechanical properties (impact resistance) remain insufficient
Solution Approach 1:
The invention changes the molecular weight parameter of the polyethylene resin to 230,000 or more, which fundamentally alters the compatibility and mechanical properties of the resin composition. This parameter change enables both good compatibility between EVOH and polyolefin resin and excellent impact resistance without requiring additional compatibilizers that would compromise transparency.
Solution Approach 2:
The invention creates a composite resin composition by specifically combining EVOH with polyethylene resin of controlled high molecular weight (230,000 or more) and polyolefin resin containing polar groups. This composite structure achieves synergistic effects where the high molecular weight polyethylene provides compatibility and mechanical strength, while the polar polyolefin enhances interfacial adhesion, resulting in both compatibility and impact resistance.
2Ease of repair
If recycled EVOH and polyolefin resin are used to reduce waste, then environmental load is reduced, but compatibility and mechanical properties deteriorate
Solution Approach 1:
The invention applies parameter changes to the polyethylene resin (molecular weight ≥230,000) to enable effective recycling of EVOH and polyolefin resin. This high molecular weight parameter ensures that even when using recycled materials, the composition maintains excellent compatibility and mechanical properties, solving the degradation issue typically associated with recycled plastics.
Solution Approach 2:
The high molecular weight polyethylene resin acts as an intermediary material that mediates between EVOH and polyolefin resin in recycled compositions. It provides a compatible matrix that maintains the integrity and performance of the recycled resin composition, enabling successful recycling without compromising compatibility or mechanical properties.
3Ease of manufacture
If conventional polyethylene resin is used in resin composition, then processing is simplified, but transparency and impact resistance are poor
Solution Approach 1:
The invention changes the molecular weight parameter of polyethylene resin to 230,000 or more, which simultaneously improves impact resistance while maintaining processability. This specific parameter change enables the resin to achieve both high mechanical performance and ease of manufacturing through conventional melt molding methods.
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.