Polyether Polyamide Composition Hydrolysis Resistance
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Solution Overview
Problem
Existing polyamide resin compositions for automobile and electronic parts face challenges in achieving a balance between hydrolysis resistance, transparency, and mechanical properties such as flexibility and impact resistance, with previous solutions either lacking in transparency or exhibiting insufficient flexibility and impact resistance.
Innovation Solution
A polyether polyamide composition is developed, comprising a polyether polyamide blended with a molecular chain extender containing carbodiimide and epoxy groups, which enhances hydrolysis resistance, transparency, and mechanical properties like flexibility and tensile elongation, achieved through specific formulations and processing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyamide resin is blended with an aliphatic carbodiimide compound to improve hydrolysis resistance, then hydrolysis resistance is improved, but flexibility and impact resistance become insufficient
Solution Approach 1:
The invention uses a composite resin system combining polyamide resin (30-70 wt%) with polyether resin (70-30 wt%), where the polyether resin acts as a flexible matrix and the polyamide resin provides hydrolysis resistance. This composite structure allows both flexibility and hydrolysis resistance to coexist, resolving the contradiction between these properties.
Solution Approach 2:
The invention introduces a specific polyether diamine compound with controlled molecular weight (200-1000) and structural parameters (x+y+z=2-20, x≥1) to create localized flexible segments within the polyamide structure. This local modification provides flexibility without compromising the overall hydrolysis resistance of the polyamide matrix.
2Strength
If two kinds of polyamide resins with different refractive indices are blended to improve mechanical properties, then strength and impact resistance are improved, but cloudiness occurs reducing transparency
Solution Approach 1:
The invention changes the fundamental approach from blending two polyamide resins to using a polyamide-polyether blend system. The polyether resin has different optical properties that prevent cloudiness while still providing mechanical strength. This parameter change in the resin system composition resolves the transparency issue while maintaining improved mechanical properties.
Solution Approach 2:
The invention ensures homogeneous dispersion and compatibility between polyamide and polyether resins through careful selection of the polyether diamine structure and molecular weight control. This homogeneity prevents phase separation and cloudiness, maintaining transparency while achieving the desired mechanical property enhancement.
3Strength
If the polyether diamine compound has higher molecular weight to improve flexibility, then flexibility is improved, but melt moldability deteriorates
Solution Approach 1:
The invention optimizes the molecular weight parameter of the polyether diamine compound to a specific range (200-1000) with controlled structural parameters (x+y+z=2-20, x≥1). This parameter optimization balances flexibility improvement with maintained melt flow characteristics, ensuring both flexibility and melt moldability are achieved.
Solution Approach 2:
The invention uses a moderate amount of polyether diamine compound (providing 10-50 mol% of the diamine component) rather than excessive amounts. This partial action provides sufficient flexibility improvement while avoiding excessive viscosity increase that would harm melt moldability, resolving the contradiction between these two properties.
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 polyether polyamide composition demonstrates improved hydrolysis resistance, transparency, and mechanical properties, including flexibility and tensile elongation, while maintaining heat resistance and melt moldability, making it suitable for applications in automobile and electronic parts.
Implementation Method 1
having blended therein from 0.01 to 15 parts by mass of at least one molecular chain extender (B) selected from a carbodiimide compound and a compound containing two or more epoxy groups in a molecule thereof
Implementation Method 2
having blended therein from 0.01 to 15 parts by mass of at least one molecular chain extender (B) selected from a carbodiimide compound and a compound containing two or more epoxy groups in a molecule thereof
Implementation Method 3
which comprises blending 100 parts by mass of the polyether polyamide (A1) with from 0.01 to 15 parts by mass of the molecular chain extender (B) and melt kneading the blend
Data Source
AI summary
Provided is a polyether polyamide composition including 100 parts by mass of a polyether polyamide in which a diamine constituent unit thereof is derived from a specified polyether diamine compound and a xylylenediamine, and a dicarboxylic acid constituent unit thereof is derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms, having blended therein from 0.01 to 15 parts by mass of at least one molecular chain extender selected from a carbodiimide compound and a compound containing two or more epoxy groups in a molecule thereof.