Aliphatic Polyester Resin Crystallization via Aromatic Sulfonate Nucleation
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Solution Overview
Problem
Aliphatic polyester resin compositions are slow to crystallize, leading to long molding times and deformation issues during mold release, resulting in inferior physical characteristics of molded products.
Innovation Solution
Incorporating specific metal salts of aromatic sulfonates as nucleating agents, such as alkali or alkaline earth salts of sulfo-phthalic acid dialkyl esters, to accelerate crystallization and improve molding conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional nucleating agents are used in aliphatic polyester resin compositions, then crystallization is promoted to some extent, but crystallization remains slow and molding time remains long
Solution Approach 1:
The patent changes the chemical composition parameters of the nucleating agent by selecting specific metal salts (alkali metal or alkaline earth metal salts) of aromatic sulfonates with particular structural features (Formula 1). This parameter change in the nucleating agent's chemical structure enables significantly faster crystallization rates, reducing molding time while maintaining high productivity.
Solution Approach 2:
The patent creates a composite resin composition by combining aliphatic polyester resin with specifically selected metal salt nucleating agents. This composite material system achieves synergistic effects where the metal salt nucleating agents work together with the polyester resin matrix to promote rapid crystallization, solving both the productivity and time loss issues simultaneously.
2Manufacturing precision
If conventional nucleating agents are used, then some crystallization occurs, but molded products undergo deformation during mold releasing and have inferior physical characteristics
Solution Approach 1:
The patent modifies the nucleating agent parameters by selecting metal salts with specific properties (alkali metal or alkaline earth metal salts of aromatic sulfonates). This parameter change produces more uniform and controlled crystallization, resulting in molded products with superior physical characteristics and resistance to deformation during mold releasing, thereby improving both manufacturing precision and reliability.
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 use of metal salts of aromatic sulfonates as nucleating agents enables the production of molded articles with superior physical characteristics and reduced deformation during mold release, allowing for faster and more efficient molding processes.
Implementation Method 1
aliphatic polyester resin compositions containing a specified kind of metal salt of aromatic sulfonate should be used as nucleating agent for crystallization
Data Source
AI summary
An aliphatic polyester resin composition, useful for producing molded articles without causing deformation at the mold release time, has a non-copolymerized mixture of an aliphatic polyester resin including one or more polylactic acid resins and a crystallization nucleating agent including one or more metal salts of an aromatic sulfonate of Formula 1:where X is a residual group obtained by removing three hydrogen atoms from benzene, R1 and R2 are each hydrocarbon group with 1-6 carbon atoms, M is one or more selected from the group of potassium atom, rubidium atom, barium atom, strontium atom and calcium atom, and n is 1 if M is alkali metal atom and 2 if M is alkali earth metal atom; the aliphatic polyester resin composition contains 0.01-5 weight parts of the one or more metal salts of aromatic sulfonate shown by Formula 1 for 100 weight parts of the aliphatic polyester resin.