Polyamide Resin Heat Resistance Melt Processability
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Solution Overview
Problem
Current polyamide resins lack sufficient heat resistance, processability, and brightness while exhibiting high water absorptivity, making them unsuitable for applications like LED reflectors and plastic joints that require excellent physical properties and appearance.
Innovation Solution
A polyamide resin is developed by combining specific aliphatic diamines (C4, C6, C8, C10 and C12, C14, C16, C18) with dicarboxylic acids, optimizing the mole ratio and using end capping agents to achieve improved melt processability, heat resistance, low water absorptivity, and enhanced brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aromatic polyamides are used to improve heat resistance, then thermal stability is improved, but melt processability deteriorates due to high melting point
Solution Approach 1:
The patent creates a composite polyamide system by combining aromatic polyamide segments (providing heat resistance) with aliphatic polyamide segments (providing processability). This is achieved through copolymerization using both aromatic diamines (e.g., m-phenylenediamine) and aliphatic diamines (e.g., C6-C18 diamines) with dicarboxylic acids, resulting in a material that exhibits both high thermal stability and improved melt flow characteristics.
Solution Approach 2:
The patent modifies the chemical structure parameters of the polyamide by controlling the ratio and types of diamine monomers used. By adjusting the proportion of aromatic to aliphatic diamines and selecting specific carbon chain lengths (C6-C18), the patent optimizes the balance between melting temperature (affecting processability) and thermal degradation resistance (heat resistance).
2Ease of manufacture
If aliphatic polyamides are used to improve processability, then melt processability is improved, but heat resistance deteriorates due to insufficient thermal stability
Solution Approach 1:
The patent creates a composite polyamide system by combining aromatic polyamide segments (providing heat resistance) with aliphatic polyamide segments (providing processability). This is achieved through copolymerization using both aromatic diamines (e.g., m-phenylenediamine) and aliphatic diamines (e.g., C6-C18 diamines) with dicarboxylic acids, resulting in a material that exhibits both high thermal stability and improved melt flow characteristics.
Solution Approach 2:
The patent modifies the chemical structure parameters of the polyamide by controlling the ratio and types of diamine monomers used. By adjusting the proportion of aromatic to aliphatic diamines and selecting specific carbon chain lengths (C6-C18), the patent optimizes the balance between melting temperature (affecting processability) and thermal degradation resistance (heat resistance).
3Strength
If conventional polyamide resins are used, then basic mechanical properties are maintained, but brightness of final molded articles deteriorates
Solution Approach 1:
The patent modifies the chemical structure by incorporating long-chain aliphatic diamines (C12-C18) which have been shown to improve brightness. This structural parameter change affects the crystallinity and light scattering properties of the polymer, resulting in enhanced brightness while maintaining mechanical integrity through the balanced copolymer composition.
Data Source
AI summary
The polyamide resin of the present invention is a polymer comprising (A) aliphatic diamine; and (B) dicarboxylic acid, wherein the (A) aliphatic diamine includes (a1) a first aliphatic diamine monomer selected from at least one of C4, C6, C8 and C10 aliphatic diamines, and (a2) a second aliphatic diamine monomer selected from at least one of C12, C14, C16 and C18 aliphatic diamines. Said polymer has good melt processability, low absorbency, and excellent brightness.