Substituted Sugar Stabilizers for Thermoplastic Recyclate Degradation
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Solution Overview
Problem
Existing stabilization methods for thermoplastic plastic recyclates are inadequate in terms of effectiveness, environmental impact, and cost, as they fail to address the accelerated degradation caused by oxidative, thermal, and actinic processes, leading to reduced mechanical properties and increased light sensitivity.
Innovation Solution
Introduce substituted sugars, such as esters, ethers, or amides of alditols or cyclitols, saccharic acids, or amino sugars, into thermoplastic plastic recyclates, optionally with primary and secondary antioxidants, to inhibit degradation and mask damage sites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stabilizers are used for plastic recyclates, then stabilization against degradation is achieved, but the mechanical properties deteriorate and light sensitivity increases due to accelerated oxidative, thermal, and actinic processes
Solution Approach 1:
The patent changes the chemical parameters of the stabilizer system by introducing substituted sugars with specific functional groups (hydroxyl, carbonyl, carboxyl) that can form hydrogen bonds and interact with degradation products. This chemical parameter change allows the stabilizer to effectively neutralize degradation products while maintaining polymer chain integrity, thus preserving mechanical properties while achieving reliable stabilization
Solution Approach 2:
The patent creates a composite stabilizer system combining substituted sugars with conventional antioxidants (phenolic antioxidants and phosphites). This composite approach allows the substituted sugars to mask damage sites and the conventional antioxidants to prevent further oxidation, achieving synergistic stabilization that protects both mechanical properties and overall polymer stability
2Reliability
If conventional stabilizers are used for plastic recyclates, then stabilization is achieved, but environmental impact and cost increase
Solution Approach 1:
The patent employs substituted sugars that can be derived from renewable carbohydrate sources, replacing expensive and environmentally problematic conventional stabilizers. These sugar-based stabilizers are biodegradable, non-toxic, and can be produced through sustainable processes, providing a cost-effective and environmentally friendly alternative that maintains effective stabilization
Solution Approach 2:
The patent changes the chemical composition parameters to use sugar-derived molecules with specific functional groups that provide stabilization effectiveness. This parameter change allows the use of abundant, renewable carbohydrate resources instead of petroleum-based stabilizers, reducing both cost and environmental impact while maintaining reliable stabilization performance
3Loss of substance
If recyclates are used to replace new plastics, then resource efficiency improves, but degradation resistance decreases due to structural inhomogeneities and damage sites
Solution Approach 1:
The substituted sugars act as intermediary molecules that interact with degradation products and damage sites in the recyclate. The hydroxyl and carbonyl groups of the sugars form hydrogen bonds with oxidative degradation products, neutralizing their harmful effects and preventing further degradation, thus enabling recyclates to achieve degradation resistance comparable to new plastics
Solution Approach 2:
The patent converts the harmful degradation products present in recyclates into beneficial interactions by using substituted sugars to mask and neutralize these damage sites. The sugars bind to carbonyl groups and other degradation products through hydrogen bonding, transforming the harmful structural inhomogeneities into stable complexes that prevent further degradation and maintain polymer 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 method effectively stabilizes recyclates against oxidative, thermal, and actinic degradation, enhancing mechanical properties and reducing light sensitivity while being environmentally friendly and cost-effective.
Implementation Method 1
stabilization of thermoplastic plastic recyclates against oxidative, thermal, and/or actinic degradation
Implementation Method 2
stabilization of thermoplastic plastic recyclates against oxidative, thermal, and/or actinic degradation
Implementation Method 3
stabilization of thermoplastic plastic recyclates against oxidative, thermal, and/or actinic degradation
Data Source
AI summary
The invention relates to a method for stabilizing thermoplastic recyclates or previously damaged plastic materials against oxidative, thermal and/or actinic degradation. According to the claimed method, at least one substituted sugar, selected from the group consisting of at least one ester and/or ether of an alditol or cyclitol, at least one ester of a saccharic acid, at least one amide and/or substituted amine of an amine sugar, and mixtures and combinations thereof, as the stabilizing component is introduced in a thermoplastic recyclate and optionally additionally at least one primary antioxidant and/or at least one secondary antioxidant is introduced in a thermoplastic recyclate.