Polyester Composition for Optoelectronics with Low Processing Temperature
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Solution Overview
Problem
Existing polyester-based compositions for optoelectronic products require high processing and mold temperatures due to their high melting points, leading to equipment wear and inefficiencies in injection-molding processes, while also compromising short-period heat resistance and surface quality.
Innovation Solution
A composition comprising 5-50 parts by weight of glass fibers, 10-40 parts by weight of titanium dioxide with average particle size from 90 nm to 2000 nm, and 20-80 parts by weight of polyethylene terephthalate (PET), along with optional polybutylene terephthalate (PBT) and additives, optimized for low processing temperatures and enhanced reflectance and surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high melting point polyesters (aromatic polyesters) are used to improve short-period heat resistance, then heat resistance is improved, but processing temperature and mold temperature increase to 355°C and higher
Solution Approach 1:
The patent uses a composite polyester system combining aromatic polyester (for heat resistance) with aliphatic polyester components (to lower melting point). This composite approach allows the material to exhibit both high heat resistance during soldering and reduced processing temperatures, resolving the contradiction between these two requirements.
Solution Approach 2:
The patent modifies the polyester composition parameters by incorporating specific ratios of aromatic to aliphatic polyester components, adjusting the molecular structure to achieve optimal balance between melting point and heat resistance. This parameter optimization enables processing at lower temperatures while maintaining soldering performance.
2Ease of manufacture
If high processing temperatures are used to process high melting point polyesters, then complete melting and processing is achieved, but equipment wear increases and energy consumption rises
Solution Approach 1:
By changing the chemical composition parameters of the polyester (incorporating aliphatic components alongside aromatic components), the melting point is reduced, which directly lowers the processing temperature requirement and consequently reduces energy consumption and equipment wear.
3Manufacturing precision
If high mold temperatures are used to process high melting point polyesters, then good filling and surface quality are achieved, but cooling time and cycle time increase
Solution Approach 1:
The polyester composition is modified to have a lower melting point through the inclusion of aliphatic polyester components, which allows the material to be processed at lower temperatures and cool more rapidly in the mold, thereby reducing cycle time while maintaining surface quality.
Data Source
AI summary
The invention relates to compositions based on polyester, titanium dioxide, and glass fibers, to the use of said compositions for producing short-period-heat-resistant products and also to a process for producing short-period-heat-resistant polyester-based products, in particular polyester-based optoelectronic products.