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A CRUCIAL STEP

Once activated, Exilva's extreme network is all set for you

Exilva is a three-dimensional network of microfibrillated cellulose suspended in water. To disperse Exilva completely into the formulation, a certain amount of shear is needed, depending on the product form of Exilva. The shear will open the physical entanglements of the microfibrillated cellulose which are present at rest leading to an open network and maximum surface area 

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Remember that you are not dependent on state-of-the-art mixing equipment to disperse Exilva, but the dispersion of the microfibrils are an effect of time and shear force. If you use equipment providing less shear force, you will need to disperse the microfibrils for a longer period: 

Equipment Stirring speed (rpm) Time (mm)
Ultra-Turrax 10 000 4
Dispermat dissolver 2 000 10
Propeller mixer 2 000 15
IKA-stirrer (3 blade mixer) 750 20

What I need to consider when adding Exilva microfibrillated cellulose

Depending on the product grade you are using, you need to take the following into consideration;

I am using the Exilva V products:

When using the Exilva V products, it is critical to pay careful attention to the dispersion of the Exilva into your product formulation. When improperly dispersed, you do not gain access to the surface area of Exilva and subsequently decrease the efficiency of Exilva in your final product.

The table below describes the recommended blade speed combinations for dispersing Exilva 01-V. However, as shear is a function of blade tip speed and product rheology, lower tip speed may be enough at higher viscosities. After dispersion is complete, remaining components can be added under letdown/low shear mixing. Exilva 01-V can also be added at later stages of the formulation, if the high shear step is introduced after the addition.

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I am using the Exilva L products

The Exilva L products are generally easier to disperse, and do not need the same shear forces as the Exilva V products.

Ensure that you have enough water available in your formulation to allow for incorporation of Exilva L products.

Our recommendations for laboratory testing with Exilva microfibrillated cellulose

  • Whenever possible, start with the Exilva L products (2%) to more easily facilitate positive laboratory test results
  • Check for a homogeneous dispersion that does not contain any lumps or visible aggregates
  • Immediate sedimentation or phase separation might also indicate insufficient dispersion
  • If you suspect there is a problem with the dispersion, it might be a good idea to test different dispersion times and methods and see if this makes a difference.

 

Dispersion of Exilva GIF

A properly activated Exilva provides

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High Yield Stress

High yield stress giving improved stability of water borne or polar solvent systems at low shear

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Pronounced Shear Thinning

Extreme shear thinning with very fast viscosity recovery provides benefits during applying of water borne or polar solvent systems

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High Surface Area

Very high surface area provides substantial binding benefits and film forming of high strength films

Ready to test?

Now you know the key of getting the most out of Exilva. It's time to take action:

Request a free sample