Recycled Polyamide Resin Composition with Controlled Waste Content

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Solution Overview

Problem

Existing recycled polyamide resin compositions often contain unintended components like other thermoplastic resins and color materials, leading to varied and unpredictable physical properties, which are not adequately addressed in existing patents.

Innovation Solution

A recycled polyamide resin composition is developed by melt-kneading a polyamide resin with a polyamide-based resin waste material containing specific proportions of polyamide resin and thermoplastic resin, along with a fibrous reinforcement filler, to enhance mechanical characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of substance

If recycled polyamide resin compositions are made by mixing waste material compositions, then plastic waste reduction is achieved, but mechanical characteristics such as tensile strength, tensile elastic modulus, bending strength, bending elastic modulus and impact resistance are impaired due to unintended components and varied composition

Engineering Contradiction:

Improveplastic waste reductionVSAvoidmechanical characteristics

Core Design Contradiction:

Loss of substanceVSStrength

Solution Approach 1:

The invention changes the compositional parameters by precisely controlling the content of polyamide resin (b1) at 11.0 parts by mass or more and thermoplastic resin (b2) at 0.13 parts by mass or more when the total of polyamide resin (a) and polyamide resin (b1) is 100 parts by mass. This parameter control ensures that mechanical characteristics are not impaired while achieving waste reduction goals.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite resin composition by combining polyamide resin (a), polyamide-based resin waste material (B) containing polyamide resin (b1) and thermoplastic resin (b2), and fibrous reinforcement filler (C). This composite structure maintains mechanical strength while incorporating recycled materials.

Inventive Principle:

Principle #40Composite materials

2Productivity

If the proportion of waste material compositions in recycled resin compositions is increased, then recycling efficiency is improved, but physical properties become unpredictable and varied

Engineering Contradiction:

Improverecycling efficiencyVSAvoidphysical properties consistency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The invention establishes specific parameter ranges for waste material composition: polyamide resin (b1) content of 11.0 parts by mass or more and thermoplastic resin (b2) content of 0.13 parts by mass or more (when total polyamide resin is 100 parts by mass). These controlled parameters ensure consistent physical properties while maintaining high recycling efficiency.

Inventive Principle:

Principle #35Parameter changes

3Strength

If the content of thermoplastic resin (b2) other than polyamide resin is controlled at 0.13 parts by mass or more, then mechanical characteristics are maintained, but the composition becomes more restrictive

Engineering Contradiction:

Improvemechanical characteristicsVSAvoidcomposition flexibility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The invention sets a specific threshold of 0.13 parts by mass or more for thermoplastic resin (b2) content when the total of polyamide resin (a) and polyamide resin (b1) is 100 parts by mass. This parameter specification ensures mechanical characteristics are maintained while providing clear compositional guidelines for implementation.

Inventive Principle:

Principle #35Parameter changes

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 achieves favorable tensile strength, tensile elastic modulus, bending strength, bending elastic modulus, and impact resistance, while contributing to the Sustainable Development Goals by effectively recycling polyamide waste.

Implementation Method 1

a recycled polyamide resin composition obtained by melt-kneading a polyamide resin (a) or a polyamide resin composition (A) containing the polyamide resin (a) as a main component, a polyamide-based resin waste material (B), and a fibrous reinforcement filler (C)

Methodology Applied

Scientific EffectMelt-kneading:

Data Source

PatentEP4563659A1Recycled polyamide resin composition

Publication Date: 2025.06.04 UBE CORPORATION

AI summary

The present invention relates to a recycled polyamide resin composition obtained by melt-kneading a polyamide resin (a) or a polyamide resin composition (A) containing the polyamide resin (a) as a main component, a polyamide-based resin waste material (B), and a fibrous reinforcement filler (C), in which the polyamide-based resin waste material (B) includes a polyamide resin (b1) and a thermoplastic resin (b2) other than a polyamide resin; in a case where a total of the polyamide resin (a) and the polyamide resin (b1) is 100 parts by mass, a content of the polyamide resin (b1) is 11.0 parts by mass or more; in a case where a total of the polyamide resin (a) and the polyamide resin (b1) is 100 parts by mass, a content of the thermoplastic resin (b2) other than a polyamide resin is 0.13 parts by mass or more; and 0 to 80.0% by mass of the polyamide resin (a) or the polyamide resin composition (A) containing the polyamide resin (a) as a main component and 5.0 to 70.0% by mass of the fibrous reinforcement filler (C) are included in 100% by mass of the recycled polyamide resin composition. The recycled polyamide resin composition of the present invention can contribute to SDGs (Sustainable Development Goals).