Biodegradable Plastic Composition for Hydrolysis and Weatherability Control
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Solution Overview
Problem
Biodegradable plastics face challenges in maintaining weatherability, water resistance, and mechanical properties over long-term use, with existing compositions showing insufficient resistance to hydrolysis and biodegradation, and lacking compatibility and synergistic effects from the combined use of ultraviolet absorbents and antioxidants with carbodiimide compounds.
Innovation Solution
A biodegradable plastics composition is developed by blending biodegradable plastics with a carbodiimide compound, an ultraviolet absorbent, and an antioxidant, specifically using aliphatic polycarbodiimide compounds derived from organic diisocyanates, benzotriazole-based UV absorbents, and hindered phenol or phosphite-based antioxidants, to control biodegradation rates and enhance hydrolysis resistance and weatherability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If biodegradable plastics are used to replace conventional plastics, then environmental friendliness is improved, but weatherability and long-term durability deteriorate
Solution Approach 1:
The invention creates a composite material system by combining biodegradable polyester resin with three types of additives: carbodiimide compound (hydrolysis stabilizer), ultraviolet absorbent, and antioxidant. This composite formulation resolves the contradiction by integrating multiple functional components that collectively provide long-term weatherability while maintaining the biodegradable nature of the base polymer.
Solution Approach 2:
The carbodiimide compound acts as an intermediary substance that retards hydrolysis of the polyester resin by reacting with carboxyl groups formed during degradation. This intermediary mechanism protects the polymer chains from breaking down too quickly, thereby extending service life while preserving eventual biodegradability.
2Reliability
If carbodiimide compound is added to control biodegradation rate, then hydrolysis resistance is improved, but transparency deteriorates
Solution Approach 1:
The invention optimizes the concentration parameter of the carbodiimide compound within a specific range (0.01-10 parts by mass per 100 parts of resin). By carefully controlling this parameter, the formulation achieves sufficient hydrolysis resistance while minimizing the adverse effect on transparency. The synergistic effect of multiple additives allows for lower carbodiimide dosage compared to single-additive systems.
3Reliability
If multiple additives are combined to improve weatherability, then functional performance is improved, but formulation complexity increases
Solution Approach 1:
The invention merges three distinct protective functions (hydrolysis stabilization, UV absorption, and oxidation prevention) into a single integrated formulation system. By combining carbodiimide compound, ultraviolet absorbent, and antioxidant in specific proportions, the invention achieves comprehensive weatherability protection while maintaining manageable formulation complexity through established compatibility relationships among the additives.
4Productivity
If biodegradable plastics are designed for quick degradation, then biodegradation rate is improved, but long-term functional retention deteriorates
Solution Approach 1:
The invention creates a dynamic degradation profile where the biodegradable plastics exhibit slow degradation during the service period (maintaining functionality for 10+ years) but accelerate degradation after disposal. The additive system controls the initial degradation rate to preserve mechanical properties and weatherability during use, while the inherent biodegradable chemistry ensures rapid breakdown under composting or environmental conditions after the product lifecycle ends.
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 achieves significantly improved resistance to hydrolysis and weatherability, allowing biodegradable plastics to retain functions for about ten years or longer, suitable for consumer durables, while maintaining transparency and compatibility.
Implementation Method 1
a biodegradable plastics composition in which a biodegradable plastics is blended with three kinds of specific additives so that its biodegradation rate is controlled, its hydrolysis rate is retarded
Implementation Method 2
an ultraviolet absorbent... to control biodegradation rates and enhance hydrolysis resistance and weatherability
Implementation Method 3
an antioxidant... to control biodegradation rates and enhance hydrolysis resistance and weatherability
Data Source
AI summary
Provided are: a biodegradable plastics composition which controls a biodegradation rate with a synergistic controlling effect on three components, adjusts a hydrolysis rate, and shows significantly improved weatherability; a molded article of the composition; and a method of controlling the biodegradation rate of a biodegradable plastics. The biodegradable plastics composition includes: a biodegradable plastics; and a carbodiimide compound, an ultraviolet ray absorbent, and an antioxidant to be blended as essential ingredients into the biodegradable plastics, and the molded article of the composition is also provided.