This week I would like to discuss water-based systems where the challenge is to apply the product effectively on a surface. This can be true for a high number of products ranging from coatings, adhesives, composites (for instance plastics), materials for 3D printing, deicing products and so on. The downstream processing and application of the product is by medium or high shear equipment, meaning either a roller, brush, a spray or the like. This calls for a shear thinning rheology system to stabilize the formulation and give the correct viscosity at each step.
This weeks topic is a follow-up from our last Topic Tuesday. Then we talked about the shear thinning properties of cellulose fibrils. Now, we show you the recovery effect and properties - the thixotropy - of the cellulose fibrils back to its original viscosity. With practical examples!
I have been working with cellulose fibrils for over 6 years now, and every day there seems to be new opportunities for this product. It occurred to me the other day that my cleaning product at home contained fairly rough abrasives, enabling me to clean off dirt and stains. In the field of cleaning, this is called “agitation” and is part of the C-H-A-T cleaning formula: Chemical-Heat-Agitation-Time. Could this be something for cellulose fibrils? Let me share with you a couple of my thoughts on where the cellulose fibrils may give you some functionality.
Water soluble polymers have been used for decades, bringing various functionalities to a high number of applications. The reason for their popularity is the ability to being customized by changing molecular weight and molecular chain length, their high efficiency in use (especially the ones with high molecular weight), and their relatively simple handling. However, in certain cases polymeric viscosifiers fail to offer the needed performance and microfibrillated cellulose can offer exactly the desired properties.
Have you run into problems with incompatibilities between the surfactant you would like to use and other ingredients in your formulation? This is a common problem since surfactants are quite versatile in charge and chemical structure as well as in functionalities. This could for example lead to undesired interactions with oppositely charged ingredients.
In this blog post I will try to explain why this would not be an issue when you are planning to introduce microfibrillated cellulose (MFC) in your surfactant based system. You will also find a few recommendations on do’s and don’ts when mixing MFC and surfactants.
Currently the world financial situation is such that expensive exploration for new oil wells becomes less and less tempting. The successful oil business today is rather driven by the necessity to extract more oil out of any existing oil well, than previously considered desirable or indeed possible.
The various techniques to achieve this are called Enhanced Oil Recovery (EOR). Common for most EOR is some form of liquid or gaseous injection into the well under high pressure. The objective being to force more oil out of the reservoirs for collection.