Laser-Transmissive Resin Composition for Hydrolysis-Resistant Welding
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Solution Overview
Problem
Polyalkylene terephthalate resins have low laser light transmission properties, making them unsuitable for laser welding, and their hydrolysis resistance is not adequately improved in laser-welded sections, even with the addition of hydrolysis resistance improvers like epoxy resins.
Innovation Solution
A resin composition is developed by blending a polycarbonate resin, a carbodiimide compound, and an inorganic phosphorus compound with a polyalkylene terephthalate resin, which improves thermal stability, laser light transmission properties, and hydrolysis resistance in laser-welded sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If polyalkylene terephthalate resin is used for laser welding, then welding process can be implemented, but laser light transmission properties are insufficient
Solution Approach 1:
The patent uses a composite resin system combining polyalkylene terephthalate resin with polycarbonate resin and acrylic resin. This composite material approach enables the resin composition to transmit laser light effectively while maintaining welding suitability, resolving the contradiction between laser light transmission and welding applicability
2Use of energy by moving object
If polycarbonate resin is blended to improve laser light transmission, then laser light transmission improves, but thermal stability decreases during retention
Solution Approach 1:
The patent optimizes the blending ratios of multiple resins: polyalkylene terephthalate resin (60-90 parts), polycarbonate resin (5-30 parts), and acrylic resin (5-30 parts). This precise parameter control ensures that laser light transmission is improved while thermal stability during retention is maintained, resolving the contradiction between these two properties
3Ease of manufacture
If crystallization temperature decreases due to transesterification, then molding can proceed, but thermal resistance and mold-release properties deteriorate
Solution Approach 1:
The patent adds inorganic phosphorus compound (0.1-5 parts by mass) and carbodiimide compound (0.1-3 parts by mass) to suppress transesterification reactions. This prevents excessive decrease in crystallization temperature, thereby maintaining thermal resistance and mold-release properties while still allowing molding to proceed
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 resin composition enhances thermal stability during molding, improves laser light transmission rates in molded articles, and maintains excellent hydrolysis resistance in laser-welded sections, addressing the limitations of existing polyalkylene terephthalate resins.
Implementation Method 1
a carbodiimide compound (C)... improves the hydrolysis resistance of a laser-welded section
Implementation Method 2
an inorganic phosphorus compound (E)... improve the thermal stability of the resin composition
Implementation Method 3
blending a polycarbonate resin, a carbodiimide compound, and an inorganic phosphorus compound in a polyalkylene terephthalate resin... improves the laser light transmission properties of a molded article
Data Source
AI summary
A resin composition suitable for manufacturing a laser light transmission-side molded article; and a laser light transmission-side molded article are disclosed. A method for improving the laser light transmission properties of a resin composition molded article is also disclosed. The resin composition includes: 100 parts by mass of a polyalkylene terephthalate resin (A); 10-100 parts by mass of a polycarbonate resin (B); 0.1-3 parts by mass of a carbodiimide compound (C); 0-100 parts by mass of an inorganic filler (D); and an inorganic phosphorus compound (E). The method includes blending 0.1-3 parts by mass of a carbodiimide compound (C) in a resin composition including 100 parts by mass of a polyalkylene terephthalate resin (A), 10-100 parts by mass of a polycarbonate resin (B), 0-100 parts by mass of an inorganic filler (D), and an inorganic phosphorus compound (E).