Biodegradable Aliphatic-Aromatic Polyester Membrane Processing
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Solution Overview
Problem
Biodegradable polyester resin materials fail to meet performance and production requirements, particularly in terms of melting point, heat resistance, and mechanical properties, especially when used for membrane materials, due to low melting points and poor processing characteristics.
Innovation Solution
A biodegradable aliphatic/aromatic polyester material with a specific molecular weight range and composition, including components A and B, is developed to enhance heat resistance and mechanical properties, allowing for improved processing and application in membrane materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biodegradable polyester is made from aliphatic dibasic acid and aliphatic dibasic alcohol, then biodegradability is achieved, but melting point and heat resistance are too low for membrane material applications
Solution Approach 1:
The patent creates a copolyester composite material combining aliphatic dibasic acid (providing biodegradability) with aromatic dibasic acid (providing high melting point and heat resistance). This composite structure integrates the beneficial properties of both material types, achieving both biodegradability and thermal stability required for membrane materials.
2Temperature
If aromatic polyester (PET, PBT) is used, then heat resistance and mechanical properties are improved, but biodegradability is lost
Solution Approach 1:
The patent applies local quality by incorporating aromatic dibasic acid units at specific positions within the polymer chain rather than uniformly throughout. This allows localized regions of high thermal stability while maintaining overall biodegradability through the aliphatic segments, creating a heterogeneous structure with differentiated functional zones.
3Reliability
If block copolyester with PCL and PBT is used, then enzyme degradation is achieved, but mechanical properties and processability are insufficient
Solution Approach 1:
The patent changes the compositional parameters by optimizing the molar ratio of aliphatic to aromatic dibasic acid components, and adjusting the molecular weight and intrinsic viscosity parameters. These parameter modifications enhance both mechanical strength and enzymatic degradability, achieving a balanced performance profile suitable for membrane applications.
4Ease of manufacture
If aliphatic-aromatic copolyester with low melt viscosity is used, then processing is easier, but melt strength is insufficient for film blowing and foaming
Solution Approach 1:
The patent introduces dynamic characteristics by creating a polymer system whose rheological properties can be adjusted through composition control. The copolyester exhibits adaptable melt viscosity and melt strength that can be optimized for different processing conditions, allowing easy processing while maintaining sufficient melt strength for film blowing and foaming operations.
Data Source
AI summary
The present invention relates to a kind of biodegradable polyester and its preparation method, which belongs to the field of biodegradable co-polyester product technology. The number-average molecular weight of the biodegradable polyester material under this invention is 6000-135000g/mol, the molecular weight distribution is 1.2-6.5, and the range of crystallization temperature is 15°C-105°C, which could overcome the disadvantages of existing technical products and can be processed into membrane materials, sheet materials and foam materials. During processing, the picking property will be dramatically changed with the appearance quality improved; after heat resistance is improved, this new type of polyester material could also be applied to the processing course with long cycles, for example, the injection processing course, and the biodegradable aliphatic/aromatic polyester materials provided by this invention has excellent mechanical properties.