Copolymerized Polyester Resin Catalyst Filtration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current polyester production methods using antimony, germanium, or titanium catalysts face issues such as contamination, high costs, thermal deterioration, and coloration problems, while catalysts like aluminum and phosphorus compounds offer improved catalytic activity but require optimization to enhance polycondensation rates and molecular weight.
Innovation Solution
A copolymerized polyester resin is produced using a catalyst system comprising aluminum and phosphorus compounds, with a dicarboxylic acid ingredient containing 75 molar % or less terephthalic acid and two or more kinds of diols, maintaining a specific molar ratio of diol to dicarboxylic acid and controlling terminal group concentrations to achieve high viscosity and stable color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If antimony trioxide is used as a catalyst to achieve practical polymerization rate, then catalytic activity is improved, but metal antimony separates out causing darkened parts and contaminated products
Solution Approach 1:
The harmful metal antimony is extracted and removed from the reaction system by filtering the reaction mixture through a filter press, separating the polyester resin from the catalyst and metal antimony byproducts
Solution Approach 2:
The catalyst system uses inexpensive antimony trioxide that can be easily disposed of through filtration, replacing expensive germanium compounds while maintaining catalytic activity and allowing simple removal of metal contaminants
2Object-generated harmful factors
If germanium compound is used as a catalyst to produce polyester free from contamination, then product purity is improved, but the catalyst is very expensive and apt to be distilled out during polymerization
Solution Approach 1:
The invention replaces expensive germanium compounds with inexpensive antimony trioxide catalyst, achieving similar product purity through filtration while significantly reducing catalyst cost and eliminating catalyst distillation issues
Solution Approach 2:
The harmful metal antimony byproducts are extracted from the reaction system through filtration, achieving product purity comparable to germanium-catalyzed processes without the high cost and distillation problems
3Productivity
If tetraalkoxy titanate is used as a catalyst, then catalytic activity is improved, but the polyester is apt to be thermally deteriorated and significantly colored
Solution Approach 1:
The harmful thermal deterioration and coloration effects are removed by filtering out the titanium catalyst and its byproducts through a filter press, preventing thermal degradation and significant coloration in the final polyester product
Solution Approach 2:
The invention uses inexpensive antimony trioxide instead of expensive tetraalkoxy titanate, achieving similar catalytic activity while avoiding thermal deterioration and significant coloration problems through simple filtration
4Adaptability or versatility
If copolymerized polyester is produced with complex composition to meet functional demands, then versatility is improved, but polycondensation reaction rate decreases significantly
Solution Approach 1:
The invention optimizes the molar ratio parameters of dicarboxylic acid to diol within specific ranges (0.95-1.05) and controls terminal group concentrations to maintain high polycondensation rates while producing copolymerized polyester with desired functional characteristics
Solution Approach 2:
The invention uses feedback control by measuring terminal carboxylic acid and hydroxyl group concentrations to adjust reaction conditions and maintain optimal polycondensation rates throughout the process, ensuring both versatility 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
This approach results in a high-quality adhesive with excellent heat resistance, color tone stability, and enhanced productivity, reducing production losses and environmental impact.
Implementation Method 1
uses a polymerization catalyst containing at least one member selected from aluminum compounds and at least one member selected from phosphorus compounds
Implementation Method 2
by means of an esterification reaction or ester transfer reaction of dicarboxylic acid and/or an ester-form derivative thereof with diol and/or an ester-form derivative thereof
Implementation Method 3
by subjecting the resulting oligomer mixture to a liquid phase polycondensation using a catalyst at a high temperature in vacuo
Implementation Method 4
liquid phase polycondensation using a catalyst at a high temperature in vacuo
Data Source
AI summary
The present invention provides a copolymerized polyester resin which can produce an adhesive resin having an excellent color tone and an excellent durability when used for an adhesive to be applied to various uses . A copolymerized polyester resin, comprising, as constituting ingredients, a dicarboxylic acid ingredient containing 75 molar % or less of terephthalic acid and a diol ingredient containing two or more kinds of diols, characterized in that the copolymerized polyester resin satisfies the following (1) and (2) : (1) A decrease in a reduced viscosity after the copolymerized polyester resin is subjected to a heat treatment in a nitrogen atmosphere at 275°C for 2 hours is 0.20 dl/g or less; and (2) A color b value is 5 or less.