PET-PEF Masterbatch for Stable Blend Molding
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Solution Overview
Problem
The blending of PET and PEF resins with different heat-resistant temperatures poses challenges in kneading time and molding quality due to differences in crystallization rates, leading to prolonged molding times and reduced quality of the molded objects.
Innovation Solution
A masterbatch containing a specific proportion of PEF as an additive to PET, with a predetermined high concentration of PEF, enables short-time compatibilization and kneading, producing a blended polyester molded object with improved molding quality and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PET and PEF resins are blended to achieve high gas barrier properties and heat resistance, then the barrier properties and heat resistance are improved, but the kneading time increases and molding quality deteriorates due to different crystallization rates
Solution Approach 1:
The patent applies preliminary action by pre-blending PEF and PET resins in a masterbatch before the actual molding process. This pre-mixing ensures proper compatibilization of the different resins beforehand, so that during the subsequent molding process, the resins can be processed quickly without requiring extended kneading time, thus resolving the contradiction between achieving good barrier properties and maintaining short molding cycles
Solution Approach 2:
The patent utilizes parameter changes by controlling the proportion of PEF resin within 5-50 mass% and optimizing the intrinsic viscosity to 0.50-1.20 dl/g. These parameter optimizations ensure that the blend achieves the desired gas barrier properties while maintaining compatible processing characteristics that prevent excessive kneading time and molding quality deterioration
2Reliability
If PET and PEF resins are blended to achieve high gas barrier properties, then the barrier properties are improved, but the molding quality deteriorates due to difference in crystallization rate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the PEF resin content (5-50 mass%) and intrinsic viscosity (0.50-1.20 dl/g). This optimization ensures that the crystallization rates of PEF and PET become more compatible, allowing the blend to achieve high gas barrier properties while maintaining uniform crystallization during molding, thus preventing quality deterioration
Solution Approach 2:
The patent creates a composite material system by blending PEF and PET resins in optimized proportions within a masterbatch. This composite approach leverages the superior gas barrier properties of PEF while the controlled composition ensures compatible crystallization behavior, achieving both high barrier performance and good molding quality simultaneously
3Reliability
If a high proportion of PEF is used to maximize gas barrier properties, then the barrier properties are improved, but the kneading time increases due to incompatibility between different resins
Solution Approach 1:
The patent applies preliminary action by preparing a masterbatch with pre-compatibilized PEF and PET resins before the molding process. This pre-blending ensures that the resins are properly mixed and compatibilized in advance, so that even with high PEF content (up to 50 mass%), the subsequent processing requires minimal additional kneading time, resolving the contradiction between achieving high barrier properties and minimizing time loss
4Reliability
If PET and PEF are blended to produce receptacles for beverages susceptible to oxidative deterioration, then the barrier properties against oxidative deterioration are improved, but the molding process becomes less stable due to different heat resistant temperatures
Solution Approach 1:
The patent applies parameter changes by optimizing the PEF resin content (5-50 mass%) and intrinsic viscosity (0.50-1.20 dl/g). This optimization balances the heat resistant temperatures of PEF and PET, ensuring that the blend maintains stable molding characteristics while achieving improved barrier properties against oxidative deterioration for beverage applications
Data Source
AI summary
A masterbatch, which includes a polyester resin (A) containing a structural unit derived from terephthalic acid (A-1) and a structural unit derived from an aliphatic diol (A-2); and a polyester resin (B) containing a structural unit derived from 2,5-furandicarboxylic acid (B-1) and a structural unit derived from 1,2-ethanediol (B-2). A proportion of the polyester resin (B) relative to a total mass of the polyester resin (A) and the polyester resin (B) is 45 mass % to 90 wt %. An intrinsic viscosity of the masterbatch is 0.50 dl/g to 1.20 dl/g.