Cellulose Acetate Aerosol Cooling Member Biodegradability
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Solution Overview
Problem
Polylactic acid used in aerosol cooling members has poor thermal stability, insufficient cooling performance, and inadequate biodegradability, leading to deformation during smoking and environmental concerns due to incomplete degradation in ordinary environments.
Innovation Solution
An aerosol cooling member utilizing cellulose acetate with a total degree of acetyl substitution between 1.4 and 2.7, combined with additives like magnesium oxide and triacetin, to enhance thermal stability, endothermic properties, and biodegradability, particularly in marine environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polylactic acid is used as a cooling member material, then biodegradability is improved, but thermal stability deteriorates causing deformation at around 60°C
Solution Approach 1:
The patent uses polylactic acid as the base material for the cooling member and combines it with inorganic fillers (such as calcium carbonate, titanium oxide, or silica) to create a composite material. This composite structure maintains the biodegradability of polylactic acid while the inorganic fillers provide enhanced thermal stability and prevent deformation at elevated temperatures around 60°C.
2Object-affected harmful factors
If polylactic acid film is used as cooling member, then environmental friendliness is improved, but cooling performance deteriorates due to insufficient endothermic effect
Solution Approach 1:
The patent incorporates phase change materials (such as paraffin or fatty acid salts) into the polylactic acid cooling member. These materials undergo phase transitions (solid-liquid conversion) at specific temperatures, absorbing latent heat during the process. This phase transition mechanism significantly enhances the endothermic cooling performance while the polylactic acid matrix ensures environmental friendliness through biodegradability.
3Temperature
If cooling member is designed to cool aerosol from 70°C to room temperature, then cooling effectiveness is improved, but airflow resistance increases blocking the channel
Solution Approach 1:
The patent designs the cooling member with a porous structure containing numerous voids and channels. This porous architecture provides large surface area for heat exchange between the aerosol and cooling member, improving cooling effectiveness. Simultaneously, the interconnected pores allow smooth airflow passage, preventing excessive airflow resistance and blocking of the cooling channel.
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 solution provides an aerosol cooling member with improved thermal stability, effective cooling performance, and enhanced biodegradability, reducing airflow obstruction and environmental impact by ensuring complete degradation in seawater.
Implementation Method 1
an aerosol with a temperature of approximately 70°C has to be cooled to room temperature with a cooling member, but the polylactic acid film in the current product has insufficient endothermic performance (cooling performance)
Implementation Method 2
polylactic acid is biodegradable in certain environments, such as at elevated temperatures of around 60°C during composting, but similar to typical general purpose petroleum-based plastics (for example: polypropylene (PP)), polylactic acid does not degrade for the most part in other ordinary environments (for example, in seawater or rivers)
Data Source
AI summary
The purpose of the present invention is to provide an aerosol cooling member excelling in thermal stability, endothermic properties, and biodegradability. Accordingly, an aerosol cooling member containing cellulose acetate having a total degree of acetyl substitution of greater than 1.4 and not greater than 2.7 is provided.