Sulfur-Carbon Nanofiller Masterbatch Homogeneous Dispersion
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Solution Overview
Problem
Existing methods fail to effectively and homogeneously disperse carbon-based nanofillers, such as carbon nanotubes, into elemental sulfur due to their small size, pulverulence, and entangled structure, which hinders the achievement of desired mechanical and conductive properties in various applications.
Innovation Solution
A process involving the use of a compounding device to melt sulfur-based materials with carbon-based nanofillers, followed by kneading and optional grinding to create a homogeneous masterbatch with carbon-based nanofillers dispersed within sulfur, overcoming the challenges of viscosity and achieving stable dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon-based nanofillers are directly introduced into sulfur, then electrical conductivity and mechanical properties are improved, but homogeneous dispersion is difficult to achieve due to small size, pulverulence, and entangled structure
Solution Approach 1:
The patent changes the physical state parameter of sulfur from solid to liquid by heating above its melting point (115°C). This parameter change allows carbon-based nanofillers to disperse homogeneously in the molten sulfur, overcoming the dispersion difficulties caused by their small size and entangled structure. After cooling, the sulfur solidifies while maintaining the homogeneous distribution of nanofillers.
Solution Approach 2:
The patent uses molten sulfur as an intermediary medium to achieve homogeneous dispersion of carbon-based nanofillers. The liquid state of sulfur acts as a carrier that facilitates uniform distribution of nanofillers, which would be difficult to achieve in solid state. This intermediary liquid phase resolves the contradiction between maintaining nanofiller integrity and achieving homogeneous dispersion.
2Reliability
If carbon-based nanofillers are introduced to improve conductivity, then electrical conductivity is enhanced, but handling and dispersion become difficult due to pulverulence and entangled structure
Solution Approach 1:
The patent changes sulfur from solid to liquid state by heating, which fundamentally improves the ease of operation for incorporating carbon-based nanofillers. The molten sulfur flows and wets the nanofillers effectively, making handling and dispersion straightforward. This parameter change eliminates the difficulty of working with pulverulent nanofillers while maintaining the electrical conductivity enhancement.
3Stability of the object's composition
If sulfur is melted and mixed with carbon-based nanofillers, then homogeneous dispersion is achieved, but process complexity increases due to temperature control requirements
Solution Approach 1:
The patent utilizes the inherent melting point of sulfur (115°C) as a natural phase transition threshold. By simply heating above this temperature, sulfur transitions to liquid state, enabling homogeneous dispersion of nanofillers. This approach minimizes process complexity as it relies on a fundamental material property rather than complex processing equipment or multiple process steps.
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 creation of a homogeneous masterbatch with carbon-based nanofillers well dispersed in sulfur, providing mechanical and conductive properties suitable for applications like tire reinforcement, Li/S battery electrodes, and other uses, enhancing performance and usability.
Implementation Method 1
melting the sulfur-based material
Implementation Method 2
kneading the molten sulfur-based material and the carbon-based nanofillers
Data Source
AI summary
The invention relates to a method for producing a master batch comprising between 0.01 and 50 wt. % of carbonaceous nanofillers and at least one sulphurated material such as elemental sulphur by melt compounding, and to the master batch thus produced and the different uses thereof. The invention also relates to a solid composition comprising carbonaceous nanofillers dispersed in a sulphurated material.