Liquid-Crystalline Polyester Resin Composition Production
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Solution Overview
Problem
The production of liquid-crystalline polyester resin compositions containing titanium oxide fillers faces issues with strand flow and breakdown during extrusion, hindering the stable production of granules using the strand method.
Innovation Solution
A twin-screw extrusion granulator is used to melt-knead liquid-crystalline polyester and titanium oxide filler at a cylinder setting temperature of (Tm−10)° C. or lower, where Tm is the fluidization temperature of the polyester, to prevent strand flow and breakdown, resulting in stable granule production and high light reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the strand method is used to produce liquid-crystalline polyester resin composition with titanium oxide filler, then industrial production efficiency is improved, but strand flow inferiority and strand breakdown occur during extrusion
Solution Approach 1:
The invention changes the extrusion temperature parameter to resolve the contradiction. Specifically, it sets the extrusion temperature to 250°C or lower, which is lower than the conventional extrusion temperature. This temperature parameter change prevents strand flow inferiority and breakdown while maintaining the industrial production efficiency of the strand method, thereby achieving both high productivity and strand stability.
2Ease of manufacture
If conventional extrusion temperature is used, then melt-kneading efficiency is improved, but strand breakdown occurs during extrusion
Solution Approach 1:
The invention changes the temperature parameter from conventional high temperature to 250°C or lower. This parameter change maintains adequate melt-kneading efficiency while preventing strand breakdown, thus achieving both ease of manufacture and manufacturing precision.
Solution Approach 2:
The invention uses a composite material system consisting of liquid-crystalline polyester and titanium oxide filler with specific characteristics. The liquid-crystalline polyester has a melting point of 280°C or lower, and the titanium oxide filler has specific surface area and particle size within defined ranges. This composite material composition enables effective melt-kneading at low temperature while maintaining strand integrity.
3Illumination intensity
If titanium oxide filler is added to liquid-crystalline polyester, then light reflectance is improved, but strand flow inferiority occurs during extrusion
Solution Approach 1:
The invention changes the temperature parameter to 250°C or lower, which improves strand flow characteristics during extrusion while maintaining the high light reflectance provided by the titanium oxide filler. The low temperature prevents degradation and flow inferiority caused by the filler.
Solution Approach 2:
The invention specifies particular properties for the titanium oxide filler (specific surface area of 5-50 m²/g and particle size of 0.1-10 μm) to optimize its local characteristics. These localized property specifications ensure that the filler provides high light reflectance while maintaining compatible flow characteristics at the reduced extrusion temperature.
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 method ensures the production of uniform pellets with high light reflectance, enhancing the quality and stability of the resulting reflecting plates, particularly useful in light-emitting devices.
Implementation Method 1
melt-kneading the components (A) and (B) wherein a cylinder setting temperature is set at a temperature of (Tm−10)° C. or lower wherein Tm is a fluidization temperature of the component (A)
Data Source
AI summary
The present invention provides a method for producing a liquid-crystalline polyester resin composition, the method comprising providing a twin-screw extrusion granulator that comprises a cylinder provided with at least one supply port and two screws installed in the cylinder; supplying (A) a liquid-crystalline polyester and (B) a titanium oxide filler into the cylinder through one of the at least one supply port; and melt-kneading the components (A) and (B), wherein a cylinder setting temperature is set at a temperature of (Tm−10)° C. or lower wherein Tm is a fluidization temperature of the component (A).