Polyester Resin Alloy Composition for Toughness and Melt Compatibility
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Solution Overview
Problem
Existing polyester-based resin compositions suffer from inadequate improvements in melting properties and mechanical properties when alloyed with polyolefin-based resins, particularly due to polarity differences and the use of conventional compatibilizers.
Innovation Solution
A polyester-based resin composition comprising a polyester-based resin, a polyolefin-based resin, a glycidyl group-containing resin, and a polycarbodiimide, with specific weight percentages and molecular adjustments, including a glycidyl methacrylate unit content and MFR ranges, to enhance compatibility and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyester-based resin is alloyed with a polyolefin-based resin, then physical properties such as toughness are reduced, but the polyester-based resin can be improved by adding a compatibilizer
Solution Approach 1:
The patent uses a glycidyl group-containing resin as an intermediary substance to bridge the polyester-based resin and polyolefin-based resin. This compatibilizer contains both polar groups (glycidyl groups) that interact with polyester and non-polar regions that interact with polyolefin, thereby improving interfacial adhesion and overall compatibility of the alloy system
Solution Approach 2:
The patent creates a composite material system consisting of polyester-based resin, polyolefin-based resin, and glycidyl group-containing resin in specific proportions. This multi-component composite structure leverages the complementary properties of each component to achieve both improved toughness and compatibility
2Strength
If conventional compatibilizers are used to improve compatibility, then mechanical properties improve, but melting properties remain inadequate
Solution Approach 1:
The patent optimizes specific parameters of the glycidyl group-containing resin, including the glycidyl methacrylate unit content (5-30 wt%) and MFR (1-500 g/10 min), to simultaneously achieve good mechanical properties and melting properties. By carefully controlling these parameters, the patent resolves the contradiction between mechanical strength and melting behavior
3Reliability
If a polycarbodiimide is added as a hydrolysis-resistant agent, then hydrolysis resistance improves, but the overall composition complexity increases
Solution Approach 1:
The patent makes the polycarbodiimide serve multiple functions: it acts as both a hydrolysis-resistant agent and a chain extender. The polycarbodiimide reacts with terminal carboxylic acid or hydroxy groups of the polyester-based resin, providing both hydrolysis resistance and molecular weight enhancement, thereby reducing the need for additional separate additives
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 composition achieves significantly improved melting properties and mechanical properties, including toughness, with the ability to utilize recycled PET as a raw material, while maintaining stability and quality.
Implementation Method 1
a polycarbodiimide having a carbodiimide group reacts with a terminal carboxylic acid or hydroxy group of a polyester-based resin
Implementation Method 2
an acrylic-styrene copolymer having an epoxy group and an ethylene-methacrylic acid copolymer resin are used as compatibilizers
Data Source
AI summary
Provided is a polyester-based resin composition capable of expressing excellent melting properties and excellent mechanical properties. Also provided is a polyester-based resin molded article obtained by molding such polyester-based resin composition. The polyester-based resin composition according to an embodiment of the present invention is a polyester-based resin composition including: a polyester-based resin (A); a polyolefin-based resin (B); a glycidyl group-containing resin (C); and a polycarbodiimide (D), wherein the glycidyl group-containing resin (C) contains 2 wt% to 30 wt% of a glycidyl methacrylate unit in a molecule thereof.