Degradable Cellulose Ester Tow with Embedded Deacetylating Agents
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Solution Overview
Problem
Current methods for degrading cellulose esters, such as cellulose acetate, in articles and cigarette filters are inefficient, leading to prolonged degradation times and environmental pollution due to the slow recognition of these materials by microorganisms.
Innovation Solution
Incorporating a basic material, an enzymatic material, or a combination thereof into cellulose ester articles, either as a coating or in the form of a pill, to facilitate the deacetylation of cellulose acetate, thereby accelerating its degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If cellulose acetate is used in articles and cigarette filters, then the material provides structural integrity and functionality, but the degradation time is prolonged and environmental pollution increases
Solution Approach 1:
The patent incorporates deacetylating agents (basic materials or enzymatic materials) into the cellulose acetate structure beforehand. These agents remain dormant during use but become active upon exposure to moisture, initiating rapid deacetylation and degradation. This preliminary inclusion of degradation catalysts resolves the contradiction by enabling fast degradation without affecting the structural integrity during the product's service life.
Solution Approach 2:
The patent uses deacetylating agents as intermediaries to facilitate the degradation process. These agents (such as metal hydroxides or enzymatic materials) act as catalysts that speed up the conversion of cellulose acetate to cellulose, which is then rapidly degraded by microorganisms. This intermediary mechanism allows the material to degrade quickly without requiring direct microbial action on the resistant cellulose acetate, thus reducing environmental pollution while maintaining functionality during use.
2Duration of action of stationary object
If deacetylating agents are incorporated into cellulose ester to accelerate degradation, then degradation time is reduced, but the structural integrity and stability of the article may be compromised
Solution Approach 1:
The patent incorporates deacetylating agents at specific locations within the cellulose acetate structure, such as during fiber formation or as discrete particles distributed throughout the matrix. This localized incorporation ensures that the degradation catalysts are present where needed without uniformly compromising the structural integrity of the entire material during its service life.
Solution Approach 2:
The patent carefully controls the amount, type, and distribution of deacetylating agents to optimize the balance between degradation speed and structural stability. By adjusting parameters such as the concentration of basic materials or enzymatic materials, and selecting appropriate cellulose acetate substitution degrees, the invention achieves rapid degradation upon activation while maintaining sufficient structural integrity during use.
3Productivity
If enzymatic materials or basic materials are included in cellulose ester tow, then deacetylation efficiency is improved, but the manufacturing complexity and processing difficulty increase
Solution Approach 1:
The patent combines deacetylating agents with the cellulose acetate manufacturing process itself, incorporating them during fiber formation or tow production. This merging of the degradation catalyst incorporation step with the existing manufacturing workflow eliminates the need for separate post-processing steps, thereby improving deacetylation efficiency without significantly increasing manufacturing complexity.
Solution Approach 2:
The patent designs the system so that the cellulose acetate structure itself contains the means for its own degradation. The deacetylating agents are embedded within the material and automatically activate upon exposure to moisture in the environment, eliminating the need for external intervention or complex processing equipment to initiate degradation.
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 proposed solution achieves a significant reduction in the degradation time of cellulose acetate, with the pill-based approach deacetylating the cellulose acetate tow by at least 10% in 20 days or less, and resulting in total degradation values exceeding 80%.
Implementation Method 1
the material adapted to catalyze hydrolysis of the cellulose acetate tow
Implementation Method 2
a basic material, an enzymatic material, or combinations of a basic and enzymatic material in the cellulose ester
Data Source
AI summary
Disclosed herein is a degradable cellulose ester. The cellulose ester may be formed into tow for use in cigarette filters or into articles, such as molded articles. A basic material, an enzymatic material, or combinations thereof is included in the cellulose ester in order to degrade the cellulose ester.