Polyamide Resin Composition for Gas Barrier and Low-Temperature Impact
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Solution Overview
Problem
Conventional polyamide resin compositions fail to simultaneously achieve excellent gas barrier property and impact resistance, particularly at low temperatures, making them unsuitable for use as inner liners in gas storage containers.
Innovation Solution
A polyamide resin composition comprising specific ratios of polyamide resin, thermoplastic polyester elastomer, impact modifier, and nucleating agent, which includes a range of 0.5 to 20 parts by weight of TPEE, 11 to 34 parts by weight of impact modifier, and 0 to 3 parts by weight of nucleating agent, enhancing both gas barrier and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyamide resin composition uses high TPEE content to improve impact resistance, then impact resistance improves, but gas barrier property deteriorates
Solution Approach 1:
The patent optimizes the TPEE content parameter within a specific range (5-20 parts by weight per 100 parts polyamide resin) to achieve the best balance between impact resistance and gas barrier property. This parameter optimization resolves the contradiction by identifying the precise quantitative range where both properties are satisfied simultaneously.
Solution Approach 2:
The patent creates a composite material system combining polyamide resin, TPEE, impact modifier, and nucleating agent in specific proportions. This composite approach allows the material to exhibit both the gas barrier properties of polyamide and the impact resistance of TPEE and impact modifier, resolving the contradiction through synergistic material combination.
2Strength
If impact modifier content is increased to improve low temperature impact resistance, then impact resistance improves, but gas barrier property deteriorates
Solution Approach 1:
The patent specifies the impact modifier content within a precise range (15-30 parts by weight per 100 parts polyamide resin) to optimize low temperature impact resistance while maintaining acceptable gas barrier properties. This parameter control resolves the contradiction by preventing excessive impact modifier addition that would harm gas barrier performance.
Solution Approach 2:
The patent introduces a nucleating agent (0.1-3 parts by weight) that locally modifies the crystalline structure of the polyamide resin. This local structural modification improves the overall gas barrier property without significantly affecting the impact resistance provided by the TPEE and impact modifier, thus resolving the contradiction.
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 composition exhibits excellent gas barrier property and high impact resistance at low temperatures, along with good mechanical properties like tensile strength and heat resistance, suitable for use as inner liners in gas storage containers.
Implementation Method 1
a nucleating agent with specific amount ratios... exhibits excellent gas barrier property
Data Source
AI summary
The present invention relates to a polyamide resin composition and, more specifically, to: a polyamide resin composition which, by comprising a polyamide resin, a thermoplastic polyester elastomer (TPEE), an impact modifier, and a nucleating agent in a specific weight ratio, can exhibit excellent gas barrier properties and excellent impact resistance (particularly, high low-temperature impact resistance) simultaneously, and furthermore, can be very suitable for use as an inner liner of a gas storage container due to excellent heat resistance and mechanical properties such as tensile strength; and a molded product comprising same (particularly, an inner liner of a gas storage container).