PBT Polyester Composition With SAXS Control for Laser Welding
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Solution Overview
Problem
Existing polyester materials have low transmittance to laser beams and high electromagnetic wave transmission loss, limiting their application in laser welding, particularly in high-frequency communication and aerospace industries.
Innovation Solution
A polyester composition comprising PBT resin with a specific SAXS spectrum slope within the range of -2.00 to -4.20, which improves laser transmittance and reduces electromagnetic wave transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional polyester materials are used, then good mechanical properties and chemical stability are achieved, but laser transmittance is low
Solution Approach 1:
The patent applies parameter changes by controlling the SAXS spectrum slope within the specific range of -2.00 to -4.20, which fundamentally alters the material's optical properties. This parameter control enables the polyester composition to achieve high laser transmittance while maintaining good mechanical properties, resolving the contradiction between optical performance and mechanical reliability
Solution Approach 2:
The patent utilizes composite materials by combining PBT resin with specific additives and controlling the molecular structure to create a polyester composition with enhanced properties. The composite structure allows simultaneous achievement of high laser transmittance and maintained mechanical strength, overcoming the limitation of conventional single-material polyester
2Use of energy by moving object
If conventional polyester materials are used, then good formability and dimensional stability are achieved, but electromagnetic wave transmission loss is high
Solution Approach 1:
The patent applies parameter changes by controlling the dielectric constant and dissipation factor through SAXS spectrum optimization. By adjusting the slope parameter within -2.00 to -4.20, the material achieves low electromagnetic wave transmission loss while maintaining good formability and dimensional stability required for manufacturing
Solution Approach 2:
The patent applies local quality by creating specific nanostructures within the polyester composition that have optimized electromagnetic properties. The controlled SAXS spectrum indicates localized structural features that reduce electromagnetic wave transmission loss without compromising the overall formability and dimensional stability of the material
3Manufacturing precision
If laser welding is applied to conventional polyester, then precise welding area control is achieved, but welding speed is limited due to low laser transmittance
Solution Approach 1:
The patent applies parameter changes by optimizing the laser transmittance parameter of the polyester composition through SAXS spectrum control. The improved transmittance allows more laser energy to reach the welding interface, significantly increasing welding speed while the material's optical properties maintain precise welding area control through controlled energy distribution
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 improved polyester composition achieves higher total transmittance under near-infrared light, lower dielectric constants, and lower dissipation factors, making it suitable for high-frequency communication and aerospace applications.
Implementation Method 1
improve the transmittance to laser beams of polyester materials
Implementation Method 2
reduce the electromagnetic wave transmission loss of the polyester composition
Data Source
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AI summary
Provided are a polyester composition and its product. The polyester composition comprises polybutylene terephthalate resin and is analyzed by small angle X-ray scattering (SAXS) to obtain a spectrum with the vertical axis representing scattering intensity and the horizontal axis representing scattering vector. A slope of the SAXS spectrum ranges from -2.00 to -4.20 within the scattering vector ranging from 0.15 nm-1 to 0.20 nm-1. The polyester composition with the foresaid features can have improved laser transmittance and low electromagnetic wave transmission loss, thereby enhancing the value of plastic products joined by laser welding.