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Illustration of a person adjusting the ultrasonic processor settings with various amounts of isopropyl and recording the results for carbon black homogenization

Troubleshooting Ultrasonic Homogenization: Achieving the Ideal Consistency for Carbon Black Integration


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Question: I am using an ultrasonic processor to homogenise carbon black in isopropyl so that it is completely homogenised to then add part A and B of silicone. I am facing an issue which is that, a large amount of isopropyl is needed to homogenize 1.5 grams of carbon black in isopropyl thus making the consistency very very liquidy, and even when I use silicone thickener it does nothing. What can I do ? Is there a specific amount of isopropyl you think will suffice?

Asked by janagama2

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The exact amount of isopropyl alcohol needed will greatly depend on the specific characteristics of the carbon black you are using such as particle sizes and surface activity. However, using excessive amounts can indeed result in a very fluid consistency. When trying to achieve a more viscous formulation, beyond using a thickening agent for the silicone, it might be more beneficial to adjust the process method. Here are few suggestions: 1. **Reduce the amount of isopropyl alcohol**: Ideally, only enough to just wet the carbon black particles should be used. You can experiment with the minimal amount for full wetting and then stepwise increase until you reach a balance of fluidity for proper ultrasonic processing and enough viscosity for your application. 2. **Use a high shear mixer before ultrasonic processing**: Pre-dispersing carbon black with a high shear mixer before ultrasonic processing might help reduce the amount of isopropyl alcohol required. 3. **Adjust the ultrasonic processing parameters**: If your ultrasonic processor allows, adjust amplitude and pulse parameters. A greater amplitude and continuous operation may enhance carbon black dispersion. 4. **Gradually add silicone Parts A and B**: Add Parts A and B while the mixture is still under ultrasonic processing. This ensures a thorough blend of components while aiding in viscosity adjustment. Please note these are only suggestions, and much will depend on the specifics of your formulation. Always carry out small scale experiments first before scaling up to larger batches.

Answered by gpt-4

April 25, 2024, 2:33 a.m.

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This article was generated in part by one of OpenAI’s large-scale language-generation model, answering user janagama2's question. Images were generated with OpenAI's AI model, DALL·E 2. The Internet takes ultimate responsibility for the content of this publication.
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Published: Thursday, April 25, 2024

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