Stretched Polyamide Film Impact Resistance Gas-Barrier Tradeoff
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Solution Overview
Problem
Current gas-barrier polyamide films, such as Nylon MXD6, lack sufficient impact resistance, flexibility, and pin-hole resistance, and the addition of elastomers compromises gas-barrier properties and transparency.
Innovation Solution
A stretched polyamide film is developed by blending a m-xylylene group-containing polyamide with a modified polyester-based elastomer that is graft-modified with ethylenically unsaturated carboxylic acid, maintaining gas-barrier properties while enhancing flexibility, impact resistance, and pin-hole resistance, and retaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elastomer is added to improve impact resistance, then impact resistance is improved, but gas-barrier properties and transparency are reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the elastomer content within 3-20 parts by weight per 100 parts of polyamide resin, and controlling the graft modification degree of the polyester-based elastomer with ethylenically unsaturated carboxylic acid. These parameter optimizations enable achieving sufficient impact resistance while minimizing the negative impact on gas-barrier properties and transparency.
Solution Approach 2:
The patent creates a composite material system by blending polyamide resin with polyester-based elastomer that has been graft-modified with ethylenically unsaturated carboxylic acid. This composite structure combines the strength and gas-barrier properties of polyamide with the impact resistance of the modified elastomer, achieving a synergistic effect that resolves the contradiction between impact resistance and gas-barrier performance.
2Ease of operation
If elastomer is added to improve flexibility, then flexibility is improved, but gas-barrier properties are reduced
Solution Approach 1:
The patent optimizes the flexibility parameter by controlling the elastomer content within 3-20 parts by weight per 100 parts of polyamide resin and adjusting the graft modification degree. This parameter control ensures that flexibility is improved to a satisfactory level while the gas-barrier properties remain substantially maintained, resolving the technical contradiction between these two properties.
3Reliability
If elastomer is added to improve pin-hole resistance, then pin-hole resistance is improved, but transparency is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the elastomer content (3-20 parts per 100 parts polyamide) and the graft modification degree with ethylenically unsaturated carboxylic acid. These controlled parameter adjustments enable achieving improved pin-hole resistance while maintaining sufficient transparency for practical packaging applications, thereby resolving the contradiction between these two properties.
Data Source
AI summary
A stretched polyamide film including at least one stretched layer made of a mixed resin containing a polyamide resin and a modified polyester-based elastomer Y. The polyamide resin X is mainly constituted by m-xylylenediamine unit and C6-12 α,ω-aliphatic dicarboxylic acid unit. The modified polyester-based elastomer is graft-modified with an ethylenically unsaturated carboxylic acid or its anhydride. Such stretched polyamide film is drastically improved in the flexibility, impact resistance and pin-hole resistance with little reduction in the gas-barrier properties while retaining an enough transparency to practical use.