Biodegradable Plastic Bag Composition Using CAP and PBS
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Solution Overview
Problem
Existing biodegradable plastic bags made from materials like PLA or PHA are low in tensile strength and elongation, making them prone to tearing and unsuitable for use as volume-rate garbage bags.
Innovation Solution
A biodegradable plastic bag composition comprising cellulose acetate propionate (CAP) and polybutylene succinate (PBS) with a weight ratio of 75:25 to 90:10, optionally including a compatibilizer and antioxidant, which are mixed and molded to produce a plastic bag with improved tensile strength and elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biodegradable plastic bags are made from PLA or PHA, then biodegradability is improved, but tensile strength and elongation deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of cellulose acetate propionate (CAP) as the base biodegradable polymer and polyethylene (PE) as the reinforcing additive. This composite approach allows the plastic bag to maintain biodegradability from the CAP while gaining enhanced tensile strength and elongation properties from the PE additive, thereby resolving the contradiction between biodegradability and mechanical strength
2Strength
If plastic bags are made from conventional PE or PP, then tensile strength is improved, but biodegradability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating biodegradable cellulose acetate propionate as the primary material instead of conventional non-biodegradable PE or PP. By carefully controlling the additive content (0.1-10 parts by weight of PE per 100 parts by weight of CAP) and using specific processing conditions, the patent achieves both adequate tensile strength and biodegradability, resolving the contradiction between strength and environmental friendliness
3Reliability
If biodegradable plastic bags are made with low additive content, then biodegradability is improved, but tensile strength deteriorates
Solution Approach 1:
The patent optimizes the additive content parameter within a specific range (0.1-10 parts by weight of PE per 100 parts by weight of CAP). This controlled parameter adjustment ensures that the biodegradability is maintained (since the base CAP remains dominant) while achieving sufficient tensile strength enhancement from the additive, resolving the contradiction between biodegradability and strength
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 plastic bags exhibit a tensile strength of approximately 40 N/mm2 to 60 N/mm2 and elongation of approximately 70% to 90%, making them less likely to tear and more suitable for use as volume-rate garbage bags, while also having a low defect rate during manufacturing.
Implementation Method 1
a plastic bag composition includes cellulose acetate propionate (CAP) and polybutylene succinate (PBS)
Data Source
AI summary
The present disclosure relates to a biodegradable plastic bag composition and a method for manufacturing a plastic bag using the same, wherein the plastic bag composition includes: cellulose acetate propionate (CAP); and polybutylene succinate (PBS), wherein cellulose acetate propionate:polybutylene succinate, which is the weight ratio of the cellulose acetate propionate and the polybutylene succinate, is approximately 75:25 to approximately 90:10.