Polyolefin Wax Depolymerization and Oxidation for Fast Biodegradability
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Solution Overview
Problem
Existing methods for producing polyethylene and polypropylene waxes, such as polymerization and by-product refining processes, are costly, complex, and lack flexibility, with high capital and operational expenses, and do not efficiently produce biodegradable waxes.
Innovation Solution
A thermal depolymerization process using extruder systems to convert polyethylene and polypropylene thermoplastic resins into biodegradable waxes within specific viscosity and molecular weight ranges, followed by oxidation to enhance biodegradability, allowing emulsification in aqueous media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polymerization process is used to produce polyethylene waxes, then well-defined material characteristics are obtained, but high production costs and complex processes are incurred
Solution Approach 1:
Instead of producing waxes through polymerization (building up molecules), the invention uses depolymerization (breaking down molecules) of polyethylene resins to obtain waxes with controlled molecular weights and viscosity ranges, thereby inverting the traditional synthesis approach to achieve both precision and cost-effectiveness
Solution Approach 2:
The invention controls wax characteristics by adjusting depolymerization parameters such as temperature, residence time, and catalyst type, allowing precise control over molecular weight distribution and viscosity while maintaining process simplicity and cost-competitiveness
2Quantity of substance
If by-product refining process is used, then polyethylene waxes are obtained, but high refining costs and lack of flexibility are incurred
Solution Approach 1:
The invention extracts the desired wax fraction directly from the depolymerization reaction mixture through simple separation processes, eliminating the need for complex multi-stage refining operations required in by-product recovery methods, thereby reducing costs and increasing flexibility
Solution Approach 2:
By adjusting depolymerization conditions such as temperature and catalyst selection, the invention directly produces waxes within target molecular weight and viscosity ranges, eliminating the need for subsequent expensive refining operations to achieve desired specifications
3Adaptability or versatility
If traditional depolymerization process is used, then production flexibility is improved, but biodegradability is not achieved
Solution Approach 1:
The invention introduces specific local chemical modifications through oxidation treatment that creates hydrophilic groups and carbonyl structures at specific locations on the polymer chains, enabling biodegradability while maintaining the overall flexibility and adaptability of the production process for different resin feedstocks
Solution Approach 2:
The invention produces composite wax structures combining hydrophobic polyethylene chains with hydrophilic oxidized groups, creating materials that maintain the desirable properties of conventional waxes while gaining biodegradability through the integrated oxidation step
4Reliability
If oxidation process is added to enhance biodegradability, then biodegradability is improved, but process complexity increases
Solution Approach 1:
The invention merges the oxidation step with the existing depolymerization process by using the same reactor system and integrating oxygen supply into the reaction zone, thereby enhancing biodegradability without requiring separate dedicated oxidation equipment or complex process infrastructure
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 high-quality, biodegradable waxes in under 30 days, expanding their applications by maintaining biodegradability in liquid or pasty forms, reducing production costs and complexity.
Implementation Method 1
process for preparing polyethylene and polypropylene polyolefin waxes by thermal depolymerization of polyethylene and polypropylene thermoplastic resins
Implementation Method 2
reacting polyethylene thermoplastic resins to prepare polyethylene waxes, as described in this patent, will provide a specific chemical transformation in the molecules of the polyethylene wax obtained, making them subject to subsequent oxidation
Implementation Method 3
Such oxidized waxes, having biodegradability characteristics in a short period of time, may subsequently be emulsified or dispersed in an aqueous medium
Data Source
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AI summary
This invention refers to a process for preparing polyethylene and polypropylene polyolefin waxes by thermal depolymerization of polyethylene and polypropylene thermoplastic resins, and particularly preparing polyethylene waxes within a certain viscosity range and molecular weight that transform them into 100% biodegradable polyethylene waxes in a short period of time (less than 30 days); the depolymerization process also demonstrates that the reaction of polyethylene thermoplastic resins to prepare polyethylene waxes will provide a specific chemical transformation in the molecules of the polyethylene wax obtained, making them subject to subsequent oxidation through a very fast, cost-effective and high-yield process; the oxidized polyethylene waxes obtained has excellent quality and are also waxes with biodegradability characteristics in a short period of time, such as the original non-oxidized waxes; such oxidized waxes, having biodegradability characteristics in a short period of time, can subsequently be emulsified or dispersed in an aqueous medium, while maintaining the biodegradability characteristics in a short period of time, just like the original oxidized waxes, and enabling the use thereof in liquid, semi-pasty or pasty form.