PBAT Polyester with Reduced Crystallinity for Plastic Wraps
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Solution Overview
Problem
Existing biodegradable polybutylene adipate terephthalate (PBAT) materials for plastic wraps suffer from poor physical properties such as extensibility, softness, and resilience, limiting their application.
Innovation Solution
A manufacturing method involving esterification, pre-polymerization, and polymerization reactions using a mixture of aromatic and aliphatic acids and alcohols, including phthalic and isophthalic acids, to produce polybutylene adipate terephthalate with a bent molecular shape and reduced crystallinity, enhancing properties like self-adhesiveness and resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polybutylene adipate terephthalate is used as a biodegradable material for plastic wraps, then environmental friendliness is improved, but physical properties (extensibility, softness, resilience) deteriorate
Solution Approach 1:
The patent creates a composite polyester material by combining polybutylene adipate terephthalate (PBAT) with polybutylene succinate (PBS) in specific ratios. This composite structure allows the material to maintain biodegradability while improving physical properties such as extensibility, softness, and resilience through the synergistic effects of the two polymers.
Solution Approach 2:
The patent modifies the molecular structure parameters of PBAT by controlling the ratio of aromatic carboxylic acid to aliphatic carboxylic acid (0.45:0.55 to 0.2:0.8) and adjusting the crystallinity content (30-70%). These parameter changes enable the material to achieve optimal balance between biodegradability and physical performance for plastic wrap applications.
2Ease of manufacture
If terephthalic acid is used as the primary aromatic carboxylic acid, then manufacturing simplicity is maintained, but molecular shape regularity and crystallinity increase, reducing softness and extensibility
Solution Approach 1:
The patent introduces local structural variation by incorporating phthalic acid (0.01-0.5 mol) and isophthalic acid (0.01-0.5 mol) alongside terephthalic acid in the aromatic carboxylic acid mixture. These different isomers create local irregularities in the polymer chain structure, reducing overall molecular regularity and crystallinity while maintaining manufacturing feasibility through standard esterification processes.
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 method improves the physical properties of PBAT, enabling it to be used as a primary component in plastic wraps without additional additives, thereby enhancing its applicability and performance.
Implementation Method 1
The aromatic carboxylic acid, the aliphatic carboxylic acid and the aliphatic alcohol are subjected to at least an esterification reaction
Implementation Method 2
The aromatic carboxylic acid, the aliphatic carboxylic acid and the aliphatic alcohol are subjected to at least an esterification reaction, a pre-polymerization reaction
Implementation Method 3
The aromatic carboxylic acid, the aliphatic carboxylic acid and the aliphatic alcohol are subjected to at least an esterification reaction, a pre-polymerization reaction, and a polymerization reaction
Data Source
AI summary
A manufacturing method of a polyester for a plastic wrap at least includes the following steps. An aromatic carboxylic acid, an aliphatic carboxylic acid, and an aliphatic alcohol are provided, wherein the aromatic carboxylic acid includes at least two of a phthalic acid, an isophthalic acid, and a terephthalic acid. The aromatic carboxylic acid, the aliphatic carboxylic acid and the aliphatic alcohol are subjected to at least an esterification reaction, a pre-polymerization reaction, and a polymerization reaction in sequence, so as to obtain a polybutylene adipate terephthalate.