Biodegradable Branched Polyester Foaming Process
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional foaming materials like EVA and XPE are not biodegradable and require complex cross-linking processes, limiting their environmental sustainability and processing complexity in the production of foamed articles for electronics and sporting goods.
Innovation Solution
A biodegradable branched polyester is developed through an esterification/transesterification process using a diol and dicarboxylic components with a polyfunctional compound containing multiple acid or hydroxyl functional groups, eliminating the need for chemical cross-linking additives, and optimized through specific catalysts and reaction conditions to achieve improved rheological properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional foaming materials like EVA and XPE are used, then foaming performance is achieved, but biodegradability is lost and environmental impact increases
Solution Approach 1:
The patent changes the chemical structure parameters of biodegradable polyesters by introducing branch points through polyfunctional compounds (with 3 or more hydroxyl or carboxyl groups). This structural modification transforms the polymer's rheological properties, enabling foaming capability while preserving biodegradability. The branch points create a three-dimensional network that provides the necessary melt strength and elasticity for foam formation without requiring cross-linking additives.
Solution Approach 2:
The invention creates a composite molecular structure within the polyester by incorporating polyfunctional compounds that serve multiple roles: they act as branching agents, cross-linking agents, and rheological modifiers simultaneously. This multi-functional composite approach achieves conventional foam performance in a biodegradable matrix, eliminating the need for separate cross-linking chemicals.
2Object-affected harmful factors
If biodegradable materials like PLA or unbranched PBTA are used, then environmental sustainability is improved, but foaming process complexity increases due to requirement for cross-linking additives
Solution Approach 1:
The patent merges the functions of branching agents, cross-linking agents, and rheological modifiers into a single polyfunctional compound component. This consolidation eliminates the need for multiple separate additives and simplifies the foaming process. The polyfunctional compound (with 3 or more functional groups) simultaneously provides branch points for network formation and the necessary rheological properties for foaming, reducing process complexity while maintaining environmental sustainability.
Solution Approach 2:
The polyfunctional compound serves multiple functions within the polyester system: it creates branch points for three-dimensional network formation, acts as a cross-linking agent, and modifies rheological properties to enable foaming. This multi-functionality eliminates the need for separate cross-linking additives and simplifies the overall foaming process while preserving biodegradability.
3Reliability
If cross-linking with chemical additives is used, then foaming performance is achieved, but process simplicity is reduced and additional chemicals are required
Solution Approach 1:
The patent extracts the cross-linking function from separate chemical additives and integrates it directly into the polyester polymer chain through branch points created by polyfunctional compounds. This eliminates the need for additional cross-linking chemicals and simplifies the process by incorporating the cross-linking capability directly into the base polymer structure.
Solution Approach 2:
The polyester polymer itself provides the cross-linking function through its branched structure created by polyfunctional compounds. The polymer serves its own cross-linking needs without requiring external chemical additives, achieving self-sufficiency in the foaming process while maintaining performance.
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 process produces a biodegradable polyester with enhanced melt thermal stability, high Breaking Stretching Ratio, and polydispersity index, suitable for foaming processes without the need for chemical cross-linking, ensuring energy savings and improved processing conditions.
Implementation Method 1
an esterification/transesterification step in the presence of a diol and dicarboxylic components of the polyester
Implementation Method 2
an esterification/transesterification step in the presence of a diol and dicarboxylic components of the polyester
Implementation Method 3
a polycondensation step in the presence of a polycondensation catalyst
Data Source
AI summary
The present invention relates to a biodegradable branched polyester particularly suitable for use for foaming.