Hemp-Based Conductive Ink via Controlled Charring
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Solution Overview
Problem
Hemp-based materials have been neglected due to difficulties with mechanical structure, sticky resin substances, low mass and density, and the presence of certain metabolites and cannabinoids, limiting their use in sustainable ink production, particularly for conductive and non-conductive applications.
Innovation Solution
A process involving charring hemp stalks at temperatures above 1100°C under low oxygen conditions to create micron-sized char particles, which are then milled and added to an aqueous carrier with excipients to form conductive or non-conductive inks, suitable for screen printing and offering enhanced conductivity and UV protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hemp-based materials are used for ink production, then sustainability and eco-friendliness are improved, but mechanical structure difficulties and sticky resin substances worsen the manufacturing process
Solution Approach 1:
The patent applies parameter changes by transforming the chemical composition of hemp through controlled charring at temperatures of 600-700°C, which converts the problematic cellulosic material into stable carbon particles. This parameter change (temperature treatment) eliminates the mechanical structure difficulties and sticky resin issues while preserving the sustainability benefit, enabling the hemp-derived carbon to be successfully used in ink formulations.
2Reliability
If charring temperature is increased to improve conductivity, then conductive properties are enhanced, but energy consumption and processing complexity increase
Solution Approach 1:
The patent optimizes the charring temperature parameter to a specific range of 600-700°C, which is sufficient to develop the desired conductive properties of the carbon particles without excessive energy consumption. This parameter optimization balances the trade-off between achieving adequate conductivity and minimizing energy use, avoiding the need for higher temperatures that would consume more energy.
3Reliability
If hemp stalk is charred at low oxygen conditions to create conductive char, then conductivity is improved, but processing time and temperature control complexity increase
Solution Approach 1:
The patent establishes specific parameter ranges for the charring process: temperatures of 600-700°C and durations of 12-72 hours under low oxygen conditions. These parameter specifications simplify the control complexity by providing clear operational windows, making the process manageable while still achieving the desired conductive properties in the resulting carbon particles.
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 process enables the production of sustainable, eco-friendly hemp-based inks with improved conductivity and UV protection properties, suitable for various applications, including smart textiles, while reducing waste and environmental impact.
Implementation Method 1
charring hemp stalk at a temperature of at least 1100° C. under low oxygen conditions to create a char
Data Source
AI summary
A process for forming a conductive hemp-based ink comprising carbonizing hemp and reducing the particle size of said hemp via a milling process to between 2 and 5 microns, wherein said reduced size hemp particles are combined with at least one aqueous carrier to produce an ink, and wherein said ink is conductive.