Granular Carbon Black Wet Granulation for Strength and Dispersibility
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Solution Overview
Problem
Existing carbon black granulation processes result in granular carbon black with low strength, poor dispersibility, and limited bulk density, leading to pulverization and uneven distribution in downstream applications due to the use of water alone and the introduction of impurities with additional additives.
Innovation Solution
A method for producing granular carbon black with controlled particle size distribution and secondary particle diameter, achieved through wet granulation with specific stirring speeds and water ratios, ensuring suitable particle size ranges and reduced secondary particle diameter without additional additives, resulting in improved bulk density and dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If only water is added to perform granulation on carbon black original powder, then the granulation process is simple, but the obtained granular carbon black has relatively low strength and causes pulverization phenomenon
Solution Approach 1:
The patent changes the physical parameters of water (temperature, addition rate) and granulation process parameters (stirring speed, granulation time) to optimize particle strength. By controlling these parameters within specific ranges, the granular carbon black achieves sufficient strength to prevent pulverization during transportation and use, while maintaining the simplicity of using only water as additive.
2Ease of manufacture
If only water is added to perform granulation, then the process is simple, but stirring uniformity is poor leading to large fluctuation in particle diameter and limited increase in bulk density
Solution Approach 1:
The patent employs dynamic control of stirring speed during the granulation process, adjusting the stirring rate at different stages to improve mixing uniformity. This dynamic adjustment ensures better distribution of water and carbon black particles, reducing particle diameter fluctuation and improving bulk density while keeping the process simple.
3Strength
If additives are used to improve particle strength, then granular carbon black strength increases, but impurities are introduced and dispersion is poor due to segregation of agglomerated particles
Solution Approach 1:
The patent utilizes the self-adhesive properties of carbon black particles and the surface tension of water to achieve granulation without any chemical additives. The process relies on physical forces (capillary action, surface tension) to bind particles together, forming strong granules free from impurities while maintaining good dispersion characteristics.
4Strength
If additives are used to improve particle strength, then granular carbon black strength increases, but dispersion is poor due to segregation of agglomerated particles
Solution Approach 1:
The patent optimizes process parameters including water temperature, addition rate, and granulation time to achieve the right balance between particle strength and dispersibility. By controlling these parameters, the granular carbon black maintains sufficient strength while preventing excessive agglomeration that would harm dispersion, eliminating the need for additives that cause segregation.
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 method enhances the bulk density and dispersibility of granular carbon black, reducing pulverization and ensuring uniform distribution in electrodes and resins, while maintaining the carbon black's structural integrity and performance.
Implementation Method 1
wet granulation
Implementation Method 2
adding water to carbon black original powder to perform granulation
Implementation Method 3
stirring treatment is performed at a stirring speed of 2,200 r/min to 2,800 r/min
Implementation Method 4
stirring treatment
Implementation Method 5
drying
Data Source
AI summary
The present disclosure relates to the technical field of carbon black materials, and particularly to a granular carbon black and a preparation method therefor, an electrode and a secondary battery. For the granular carbon black, particle size distribution of the granular carbon black ranges as follows: a weight percent of granular carbon black with a particle diameter less than 0.125 mm is equal to or less than 2%, a weight percent of granular carbon black with a particle diameter ranging from 0.125 to 0.85 mm is from 18% to 60%, and a weight percent of granular carbon black with a particle diameter more than 0.85 mm is from 40% to 80%; and a secondary particle diameter D50 of the granular carbon black ranges from 2.0 μm to 3.51 μm.