Polyamide Composition Flow and Flame Retardancy
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Solution Overview
Problem
Polyamide compositions used for molding small and complex components face challenges in achieving high flowability while maintaining desirable physical properties such as flame retardancy and mechanical strength.
Innovation Solution
A polyamide composition comprising 10 to 80 wt % of a polyamide with 1,10-decanediamine terephthalamide (10T) repeating units, 0.5 to 40 wt % of a copolyamide derived from terephthalic acid and a diamine with 6 or fewer carbon atoms, 0 to 25 wt % of a flame retardant, 0 to 5 wt % of a flame retardant synergist, 1 to 40 wt % of a reinforcing agent, 0 to 2 wt % of a lubricant, and 0 to 25 wt % of additional additives, which enhances flowability and maintains flame retardancy and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamide compositions are used for molding small and complex components, then mechanical properties and chemical resistance are improved, but flowability deteriorates
Solution Approach 1:
The patent employs a composite polyamide system combining semi-aromatic polyamide (PA 6T) and aliphatic polyamide (PA 610) in specific ratios (70-95 wt% PA 6T and 5-30 wt% PA 610). This composite approach leverages the high strength and stiffness of PA 6T while utilizing PA 610 to enhance flowability, allowing the material to fill complex molds effectively while maintaining desirable mechanical properties in the final component.
2Object-affected harmful factors
If flame retardant additives are incorporated into polyamide compositions, then flame retardancy is improved, but viscosity increases
Solution Approach 1:
The patent optimizes the concentration of flame retardant (Exolit OP 1230) within a specific range of 2-20 wt% and synergist (Exolit BO 600) within 0.1-5 wt%. By carefully controlling these parameter ranges and combining them with the specific polyamide blend ratio, the composition achieves effective flame retardancy while minimizing the viscosity increase that would otherwise impede flowability during molding of complex components.
Data Source
AI summary
Provided herein are polyamide compositions having desirable flow properties, for example low viscosity, which is useful for molding small components. The polyamide compositions comprise a polyamide comprising 1,10-decanediamine terephthalamide (10T) repeating units; a copolyamide comprising repeating units derived from terephthalic acid and from a diamine containing 6 or fewer carbon atoms; a reinforcing agent; and optionally, one or more of a flame retardant, a flame retardant synergist, and a lubricant.