Polyamide Film High Draw Ratio Stretching via Plasticizer
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Solution Overview
Problem
Polyamide resin films with a diamine structural unit derived from xylylenediamine are often unable to be stretched to high draw ratios, making them unsuitable for lamination with other resin films, such as polypropylene resin films that are stretchable to high ratios, as they tend to break during the process.
Innovation Solution
A polyamide resin composition is developed that includes a blend of a predetermined polyamide resin with a compound represented by Formula (1), allowing the film to be stretched to a high draw ratio by adjusting the molecular structure and incorporating a plasticizer, which reduces crystallization temperature and increases stretching stress, enabling easier and higher stretching without rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamide resin film with xylylenediamine structural unit is used, then gas barrier performance is improved, but stretching capability deteriorates (cannot be stretched to high draw ratio)
Solution Approach 1:
The patent changes the chemical structure parameters of the polyamide resin by incorporating specific structural units (adipec acid units of 80-97 mol% and xylylenediamine units of 70-100 mol%) to achieve both high gas barrier performance and improved stretching capability to draw ratios of 4.0 or higher
Solution Approach 2:
The patent creates a composite polyamide resin system that combines aromatic dicarboxylic acid units with straight-chain aliphatic dicarboxylic acid units (particularly adipic acid) and xylylenediamine units, achieving synergistic effects that provide both excellent gas barrier properties and enhanced stretchability for lamination applications
2Adaptability or versatility
If polyamide resin film is stretched to high draw ratio, then adaptability for lamination is improved, but film strength deteriorates (film breaks during stretching)
Solution Approach 1:
The patent optimizes the molecular structure parameters by controlling the ratio of adipic acid units (80-97 mol%) and xylylenediamine units (70-100 mol%) to achieve a balance between flexibility for high draw ratio stretching (4.0 or higher) and sufficient strength to prevent breakage during the stretching process
3Ease of operation
If plasticizer is added to polyamide resin, then stretching stress is reduced (easier stretching), but crystallization temperature is lowered
Solution Approach 1:
The patent incorporates plasticizer molecules into the polyamide resin matrix, which reduces the crystallization temperature and decreases stretching stress, thereby enabling easier stretching to high draw ratios while maintaining film integrity through optimized resin composition
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 resulting stretched film can be laminated with other high-draw-ratio resin films, achieving a final draw ratio of 20.0 or larger and a tensile modulus of 2.0 GPa or higher, while maintaining excellent gas barrier performance and oxygen barrier properties.
Implementation Method 1
incorporating a plasticizer, which reduces crystallization temperature
Implementation Method 2
allowing the film to be stretched to a high draw ratio
Data Source
Figure 1
Figure 2(a)~2(c')
AI summary
Provided is a stretched film stretched stretchable to a high draw ratio a method for manufacturing the stretched film, and, a polyamide resin composition used for manufacturing the stretched film. The stretched film containing 0.5 to 15 parts by weight of a compound represented by Formula (1) per 100 parts by weight of a polyamide resin, wherein the polyamide resin is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid; 50% by mole or more of the structural unit derived from diamine is derived from xylylenediamine, and 50% by mole or more of the structural unit derived from dicarboxylic acid is derived from a straight-chain aliphatic α,ω-dicarboxylic acid having 4 to 20 carbon atoms: wherein R1 represents an alkyl group having 1 to 10 carbon atoms, R2 represents an alkyl group having 2 to 12 carbon atoms, and n represents an integer of 1 to 3.