Polylactic Acid Composite End Carboxyl Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polylactic acid products are prone to aging and degradation due to microbial, light, radiation, and environmental factors, affecting their usability and leading to environmental pollution, and existing solutions do not effectively control the end carboxyl content of polylactic acid composites.
Innovation Solution
A polylactic acid composite with a controlled end carboxyl content range of 12 to 51 molKOH/t, incorporating 50 to 85 parts by weight of polylactic acid, 8 to 35 parts by weight of an inorganic filler, and 0 to 8 parts by weight of a plasticizer, optimized for suitable aging properties and biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polylactic acid products are used with natural degradation properties, then biodegradability is improved, but aging and degradation during processing and storage occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the end carboxyl content of polylactic acid within the range of 12-51 mol KOH/t. This parameter control balances the material's biodegradability and aging resistance, allowing the product to maintain stability during processing and storage while retaining excellent biodegradation capabilities after use.
2Reliability
If end carboxyl content is increased to improve biodegradability, then biodegradation rate is improved, but aging degradation during storage worsens
Solution Approach 1:
The patent identifies and controls the end carboxyl content as a critical parameter, establishing the optimal range of 12-51 mol KOH/t. This parameter control enables the material to achieve high biodegradation rates (greater than 90% after 12 weeks) while simultaneously resisting aging degradation during storage and processing.
3Reliability
If strict control of end carboxyl content is implemented, then aging properties and biodegradability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent establishes clear numerical ranges for end carboxyl content (12-51 mol KOH/t) that can be controlled through standard polymerization parameters. This provides manufacturers with actionable guidance to achieve desired performance without requiring overly complex control systems, balancing quality improvement with manufacturing feasibility.
Data Source
AI summary
The present invention discloses a polylactic acid composite and use thereof. The polylactic acid composite includes the following components: i) 50-85 parts by weight of polylactic acid; ii) 8 to 35 parts by weight of an inorganic filler; and iii) 0 to 8 parts by weight of a plasticizer; wherein the polylactic acid composite has an end carboxyl content of 12 to 51 molKOH/t. The present invention unexpectedly discovered through research that, by controlling an end carboxyl content of the polylactic acid composite within a range of 12 to 51 molKOH/t, the polylactic acid composite, under a condition of 60°C and 60% humidity, with a test time of 30 days, has a ratio of a mass melt index MFIt=30 to an initial mass melt index MFIt=0 satisfying 3.5<η= MFIt=30/ MFIt=0<5.1, which indicates that under the test conditions, the product has slow aging degradation, and the polylactic acid composite has a biodegradation rate greater than 90% after 12 weeks in the case where a thickness is 2.5 mm or less, and has suitable aging properties and excellent biodegradability.