Biodegradable Net-Shaped Articles Using PBAT, PBS, and PLA Composite
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Solution Overview
Problem
Conventional net-shaped articles, such as net bags, are difficult to decompose in natural environments due to their material composition, leading to environmental issues despite providing structural strength for packaging goods like fruits and vegetables.
Innovation Solution
A manufacturing method for biodegradable net-shaped articles using a mixture of poly(butylenes adipate-co-terephthalate) (PBAT), polybutylene-1,4-succinate (PBS), and polylactic acid (PLA) with a compatibilizer, processed through granulation, baking, extrusion, and cooling to create a net-shaped preform with high heat deflection temperature and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polymer materials (PE, PET, nylon) are used to form net bags with predetermined strength, then structural strength is improved, but biodegradability deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of PBAT (20-80 wt%), PBS (70-100 wt% of second material), and PLA (0-30 wt% of second material), along with a compatibilizer (0.05-0.5 wt%). This composite approach combines the advantages of different biodegradable polymers to achieve both required structural strength and biodegradability, resolving the contradiction between strength and environmental friendliness.
2Object-generated harmful factors
If biodegradable materials are used to make net-shaped articles, then environmental sustainability is improved, but heat tolerance deteriorates
Solution Approach 1:
The patent optimizes the compositional parameters of the biodegradable polymer mixture, specifically adjusting the ratios of PBAT, PBS, and PLA, along with adding a compatibilizer at 0.05-0.5 wt%. This parameter optimization enhances the heat deflection temperature and mechanical properties of the final product, achieving heat tolerance while maintaining biodegradability.
3Productivity
If the screw temperature is increased to improve mixing and extrusion, then processing efficiency is improved, but material degradation increases
Solution Approach 1:
The patent introduces a compatibilizer (0.05-0.5 wt%) as an intermediary substance that facilitates mixing and compatibility between the different polymer components (PBAT, PBS, PLA) at lower extrusion temperatures. This allows for efficient processing without degrading the biodegradable materials, resolving the contradiction between processing efficiency and material quality.
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 resulting biodegradable net-shaped articles exhibit high heat tolerance and durability, preventing deformation under high temperatures and ensuring environmental sustainability by decomposing naturally after use.
Implementation Method 1
melting and extruding the plastic grains by a screw-type extruder
Implementation Method 2
a screw temperature is higher than a feed inlet temperature and a die temperature
Implementation Method 3
cooling and thereby finalizing the net-shaped preform in a cooling bath at a cooling temperature between 15° C. and 30° C.
Implementation Method 4
baking the plastic grains in an oven at 60° C. ̃70° C. for 3 to 4 hours
Data Source
AI summary
A manufacturing method of biodegradable net-shaped articles includes: (a) preparing a biodegradable mixture; (b) granulating the mixture into plastic grains; (c) baking the plastic grains in an oven at 60° C. to 70° C. for 3 to 4 hours; (d) melting and extruding the plastic grains by a screw-type extruder so as to obtain a net-shaped preform; and (e) cooling and thereby finalizing the net-shaped preform in a cooling bath at 15° C. to 30° C. so as to obtain the net-shaped article.