Pre-vapor formulation stability via ion exchange
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Solution Overview
Problem
The stability of pre-vapor formulations in electronic vaping devices is compromised due to reactions between ingredients and metallic components, leading to the formation of reactive free radicals, which can contaminate the vapor and reduce the shelf life of the formulation.
Innovation Solution
Incorporating ion exchangers such as styrene-divinylbenzene, crosslinked polyacrylate carboxylic acid, and chelating agents like EDTA into the pre-vapor formulation to bind and neutralize free transition metals and oxygen, preventing the formation of hydroxyl radicals and enhancing the stability of the formulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If pre-vapor formulation is stored in contact with metallic components, then the device structure is simple and manufacturing is easy, but the formulation stability deteriorates due to reactions with metals forming free radicals
Solution Approach 1:
An ion exchanger is introduced as an intermediary substance between the pre-vapor formulation ingredients and the metallic cartridge components. The ion exchanger binds free transition metals (copper, nickel, iron) through ion exchange mechanisms, preventing these metals from catalyzing the formation of reactive free radicals that would otherwise react with formulation ingredients. This intermediary approach maintains formulation stability without requiring fundamental changes to the device structure.
Solution Approach 2:
The formulation's chemical composition parameters are modified by adding specific ion exchangers (such as styrene-divinylbenzene copolymer, crosslinked polyacrylate carboxylic acid) at controlled concentrations (0.01-5% by weight). This parameter change enables the formulation to actively neutralize metal ions through ion exchange reactions, transforming the formulation from a passive mixture susceptible to degradation into an active system that resists free radical formation while maintaining vaporization performance.
2Reliability
If ion exchangers and chelating agents are added to the pre-vapor formulation, then the stability and shelf life are improved, but the formulation complexity and manufacturing steps increase
Solution Approach 1:
Ion exchangers and chelating agents are incorporated into the pre-vapor formulation during the initial manufacturing process, before the formulation is sealed in the cartridge. This preliminary action ensures that metal ions are bound and neutralized in advance, preventing free radical formation throughout the entire shelf life of the product. The ion exchangers are mixed with other formulation ingredients (nicotine, vapor formers, flavorants) in predetermined ratios and thoroughly combined to ensure uniform distribution and immediate protective effect upon contact with metallic surfaces.
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 use of ion exchangers and chelating agents significantly reduces the formation of free radicals, thereby increasing the stability and shelf life of the pre-vapor formulation and minimizing potential harm to users by preventing the transfer of harmful radicals into the vapor.
Implementation Method 1
The pre-vapor formulation includes: an ion exchanger or an ion exchanger and a chelating agent; nicotine; and a vapor former configured to form a vapor of the pre-vapor formulation. The ion exchanger comprises at least one of styrene-divinylbenzene, a crosslinked polyacrylate carboxylic acid and a styrene divinylbenzene copolymer.
Implementation Method 2
The pre-vapor formulation includes: an ion exchanger or an ion exchanger and a chelating agent
Implementation Method 3
The cartridge includes a heater along with a reservoir capable of holding the pre-vapor formulation or liquid material. The cartridge typically includes the heater in communication with the pre-vapor formulation via a wick, the heater being configured to heat the pre-vapor formulation to produce a vapor.
Implementation Method 4
a vapor former configured to form a vapor of the pre-vapor formulation
Data Source
Figure 1~2
Figure 3~4
AI summary
There is provided a pre-vapor formulation of an e-vaping device (60), the pre-vapor formulation comprising at least one of an ion exchanger and a chelating agent. The pre-vapor formulation also comprises nicotine and a vapor former configured to form a vapor of the pre-vapor formulation.