Polyamide Injection Welding Material Triamine Units
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current injection welding methods for joining primary molded parts do not achieve sufficient weld strength, despite the use of various polyamide-containing materials, necessitating a more effective approach to enhance the bonding between resin components.
Innovation Solution
A method involving the use of a polyamide injection welding material composed of dicarboxylic acid, diamine, and triamine units, with specific molecular ratios and incorporating an inorganic filler, to achieve high weld strength by optimizing the polyamide's chemical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional polyamide-containing injection welding materials are used to join primary molded parts, then welding can be performed with high productivity, but the weld strength between the primary molded parts is insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the polyamide by introducing triamine units (0.05-1 mol%) derived from diamine condensation, and optimizes the dicarboxylic acid unit composition (60-100 mol% aromatic dicarboxylic acid units). This chemical parameter modification enables the material to achieve both high weld strength and maintain injection welding productivity
Solution Approach 2:
The invention creates a composite polyamide structure combining dicarboxylic acid units, diamine units, and triamine units. The triamine units act as a composite component that enhances weld strength while the aromatic dicarboxylic acid units maintain the material's thermal and mechanical properties, achieving both high strength and productivity
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 proposed method results in molded articles with significantly improved weld strength, heat resistance, and chemical resistance, making them suitable for applications in automotive components and other industrial uses.
Implementation Method 1
the polyamide being obtained from a polycondensation of a dicarboxylic acid and a diamine
Implementation Method 2
injection welding material containing a polyamide around or between butt weld portions of primary molded parts disposed in face-to-face contact, so as to weld the primary molded parts together
Data Source
Figure 1~2
Figure 3
AI summary
The present invention provides a method for producing molded articles by joining primary molded parts by injection welding, by which a molded article composed of primary molded parts that are joined with high weld strength can be produced. The present invention relates to a method for producing molded articles including a welding step of injecting an injection welding material containing a polyamide around or between butt weld portions of primary molded parts disposed in face-to-face contact, so as to weld the primary molded parts together to form a molded article. The polyamide contains dicarboxylic acid units and diamine units. This polyamide further contains triamine units in an amount of 0.05 to 1 mol% with respect to the total dicarboxylic acid units.