Multilayer Sheet Using Phenoxy-Modified Polyamide Resin
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aromatic polyamide resins used in laminate sheets exhibit excessive flowability at temperatures higher than their melting point, making it difficult to achieve uniform thickness and precise temperature control, which hinders the production of laminate sheets with improved heat resistance and water absorbency.
Innovation Solution
Incorporating an epoxy group-containing phenoxy resin into the aromatic polyamide resin composition, with a mass percentage of 30 to 50%, to regulate flowability and enhance the mechanical properties of the laminate sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aromatic polyamide resin is used to improve heat resistance and water absorbency, then the heat resistance and water absorbency are improved, but the flowability becomes excessively high at temperatures above melting point, making it difficult to achieve uniform thickness
Solution Approach 1:
The patent modifies the chemical composition parameters of the resin system by introducing epoxy group-containing phenoxy resin with specific molecular weight range (5,000-50,000) and controlling its content (10-60 parts by mass per 100 parts aromatic polyamide resin). This parameter change adjusts the flow characteristics of the resin composition to achieve moderate flowability suitable for extrusion processing while preserving the heat resistance properties of aromatic polyamide.
Solution Approach 2:
The patent creates a composite resin system combining aromatic polyamide resin with epoxy group-containing phenoxy resin. This composite material leverages the heat resistance of aromatic polyamide while the phenoxy resin component provides controlled flow characteristics, achieving a balance between thermal performance and processability that neither material could provide alone.
2Ease of operation
If extruding temperature is lowered to near melting point to achieve moderate flowability, then flowability is improved, but precise temperature control becomes practically difficult, leading to variations in extrusion rate
Solution Approach 1:
The patent changes the chemical composition parameters of the resin system by adding epoxy group-containing phenoxy resin, which fundamentally alters the flow-temperature relationship. This allows extrusion to be performed at higher temperatures above the melting point while maintaining moderate flowability, eliminating the need for precise temperature control near the melting point and simplifying the temperature control requirements.
3Reliability
If aromatic polyamide resin is used to laminate sheet materials, then heat resistance is improved, but the resin composition shows excessive flowability at high temperatures, making it difficult to extrude with uniform thickness
Solution Approach 1:
The patent develops a composite resin composition combining aromatic polyamide resin with epoxy group-containing phenoxy resin. This composite system maintains the heat resistance of aromatic polyamide while the phenoxy resin modifies the flow characteristics to provide moderate flowability at processing temperatures, enabling successful extrusion onto sheet materials with uniform thickness.
Solution Approach 2:
The patent adjusts the compositional parameters by controlling the ratio of epoxy group-containing phenoxy resin (10-60 parts by mass per 100 parts aromatic polyamide resin) and selecting phenoxy resin with specific molecular weight (5,000-50,000). These parameter changes optimize the balance between heat resistance and extrusion processability.
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
This approach reduces the need for precise temperature control, allows for easier production of laminate sheets with improved heat resistance and water absorbency, and maintains thickness accuracy, while also increasing tensile strength and elongation.
Implementation Method 1
polyamide resins are known to easily form hydrogen bond at amide group in the main molecular chain, to have strong intermolecular force owing to the hydrogen bond
Implementation Method 2
the polyamide resins, however, show abrupt phase change near the melting point compared with other resins because they easily show crystallinity
Data Source
Figure 1~2
Figure 3(a)~3(c)
Figure 4(a)~4(b)
AI summary
A laminate sheet that can be easily produced together with improving the heat resistance and the water absorbency. Provided is a laminate sheet prepared by laminating plural sheet materials by a resin composition, wherein the resin composition is comprised of an aromatic polyamide resin and an epoxy group·containing phenoxy resin having an epoxy group in the molecule, and the resin composition is a polyamide resin composition that contains 30 to 50% by mass of the epoxy group-containing phenoxy resin.