Biodegradable Polymer Composition for Thick-Walled Molded Items
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Solution Overview
Problem
Existing biodegradable polymer compositions for injection molding fail to achieve a balance between high temperature resistance, elastic modulus, and disintegration in industrial composting, particularly for thick-walled articles exceeding 500 microns, as they either lack sufficient heat resistance or biodegradability.
Innovation Solution
A biodegradable polymer composition comprising 5-70% of a specific polyester blend, 23-43% of polyhydroxyalkanoate with a melting point ≥160°C, and 10-20% of an inorganic filler, which provides the necessary heat resistance and disintegration properties without requiring annealing treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick-walled molded articles are manufactured to ensure resistance to deformation, then dimensional stability and heat resistance are improved, but disintegration capability in industrial composting deteriorates
Solution Approach 1:
The patent uses a composite material system comprising polyhydroxyalkanoates (PHA), polyesters (such as poly(1,4-butylene succinate-co-azelate)), and inorganic fillers (such as talc, calcium carbonate, or silica). This composite formulation allows the material to achieve both high temperature resistance for thick-walled articles and effective disintegration in industrial composting through the synergistic interaction of biodegradable polymers and compostable fillers
Solution Approach 2:
The patent specifies precise compositional parameters: polyhydroxyalkanoates with melting point ≥160°C and enthalpy of fusion ≥10 J/g, polyester content of 5-70%, and filler content of 10-20%. By controlling these parameters, the material achieves optimal balance between heat resistance for thick-walled applications and disintegration performance for industrial composting
2Stability of the object's composition
If filler is added to improve dimensional stability and elastic modulus, then heat resistance is improved, but disintegration in industrial composting deteriorates
Solution Approach 1:
The patent carefully controls filler content at 10-20% by weight and specifies filler type (inorganic fillers such as talc, calcium carbonate, or silica with specific surface areas and purity). This parameter control ensures sufficient dimensional stability while maintaining disintegration capability, as the filler amount is optimized to not excessive interfere with biodegradation
Solution Approach 2:
The patent employs a composite material system where inorganic fillers are combined with biodegradable polymers (polyhydroxyalkanoates and polyesters). The composite structure allows the filler to provide dimensional stability and heat resistance while the biodegradable polymer matrix ensures disintegration in industrial composting through enzymatic degradation
3Temperature
If polyhydroxyalkanoate with high melting point is used to achieve heat resistance, then temperature resistance is improved, but processing complexity increases
Solution Approach 1:
The patent specifies polyhydroxyalkanoates with melting point ≥160°C and enthalpy of fusion ≥10 J/g, which provides sufficient heat resistance for molded articles. The formulation also includes polyester components and fillers that modify the thermal behavior, allowing standard injection molding temperatures to be used without requiring complex annealing or special processing equipment
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 composition enables the production of molded articles with high resistance to deformation at high temperatures and dimensional stability, ensuring disintegration in industrial composting processes without the need for heat annealing, thus addressing the limitations of existing technologies.
Implementation Method 1
component iii. has a melting point (Tm2) ≥160°C and a (ΔHm) ≥10 J/g
Implementation Method 2
Molded articles comprising the composition according to the present invention are characterized by a level of heat resistance compatible with what is required by the application
Implementation Method 3
the composition has a high elastic modulus but is characterized by biodegradation kinetics that are not compatible with harmonized standard EN13432
Implementation Method 4
it is possible to solve this problem by means of a composition comprising biodegradable polyesters, inorganic fillers and polyhydroxyalkanoates with specific characteristics
Data Source
AI summary
Biodegradable polymer composition for the production of molded items comprising: i. 5-70% by weight of a polyester comprising units derived from an aromatic dicarboxylic acid, succinic acid and a C5-C24 saturated dicarboxylic acid; and units derived from a saturated aliphatic diol and an unsaturated aliphatic diol; ii 0-40% by weight of a polyester comprising units derived from succinic acid and units derived from a saturated aliphatic diol and an unsaturated aliphatic diol; iii. 23-43% by weight of a polyhydroxyalkanoate; iv. 10-20% by weight of a filler; v. 0-0.5% by weight of a cross-linking agent and/or chain extender.