Polyamide Resin Composition Solid Phase Polymerization
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Solution Overview
Problem
Existing polyamide resin compositions with cellulose fibers face challenges in achieving high viscosity, high strength, and good color tone due to long melt polymerization times, which can lead to cellulose decomposition and increased melt viscosity, making dispersion difficult.
Innovation Solution
A polyamide resin composition with a specific relative viscosity achieved through solid phase polymerization, incorporating 0.01 to 50 parts by mass of cellulose fiber with an average diameter of 500 nm or less, and optionally using phosphorous acid or sodium hypophosphite, to ensure uniform dispersion and maintain a good color tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If melt polymerization is performed for a long time to increase degree of polymerization, then viscosity and strength are improved, but coloration occurs due to cellulose decomposition
Solution Approach 1:
The patent changes the polymerization method from melt polymerization to solid-state polymerization, fundamentally altering the processing parameters. This allows the polymerization to proceed at lower temperatures where cellulose does not decompose, thereby achieving high molecular weight polyamide without coloration while maintaining good color tone (L≥20, a≤10, b≤20)
Solution Approach 2:
The patent utilizes the phase transition of polyamide from melt state to solid state during polymerization. By performing polymerization in the solid state rather than melt state, the process avoids cellulose decomposition that occurs at high temperatures, enabling extended polymerization time to achieve high viscosity without harmful coloration
2Strength
If melt polymerization time is extended to increase degree of polymerization, then viscosity increases, but dispensing becomes difficult
Solution Approach 1:
The patent changes the polymerization state from melt to solid, allowing viscosity to increase through extended polymerization time without the detrimental effects of high-temperature processing. This enables achieving high viscosity (relative viscosity ≥2.3) while maintaining good dispensing properties, as the polymerization occurs at lower temperatures that preserve material flow characteristics
3Ease of manufacture
If cellulose is mixed in aggregated condition, then mixing is simple, but uniform dispersion cannot be obtained
Solution Approach 1:
The patent applies preliminary action by treating cellulose with a surface treatment agent before mixing with polyamide. This preliminary surface modification prevents aggregation during mixing and ensures uniform dispersion throughout the resin matrix, achieving both ease of manufacture and compositional uniformity
Solution Approach 2:
The patent introduces a surface treatment agent as an intermediary substance between cellulose and polyamide. This intermediary improves the interfacial compatibility and prevents cellulose aggregation, enabling uniform dispersion while maintaining simple mixing procedures
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 solution results in a polyamide resin composition with high viscosity and strength, improved mechanical properties, and good dispensing properties while maintaining a good color tone, overcoming the limitations of long melt polymerization times and cellulose decomposition.
Implementation Method 1
the above-described object is achieved by allowing a polyamide resin composition having a specific value of the relative viscosity to have a high molecular weight by solid phase polymerization
Data Source
AI summary
Provided is a polyamide resin composition including 0.01 to 50 parts by mass of cellulose fiber in relation to 100 parts by mass of a polyamide resin, having a relative viscosity of 2.3 or more, and having an L-value, an a-value and a b-value in an Lab color space of 20 or more, 10 or less and 20 or less, respectively. The aforementioned polyamide resin composition is obtained by subjecting a polyamide resin composition having a relative viscosity of 2.2 or less to a solid phase polymerization.