What are rheological modifiers?

A rheology modifier is a material that alters the rheology of a fluid composition to which it is added; From: Carbohydrate Polymers, 2017.

What are rheology modifiers in cosmetics?

Rheology modifiers are often referred to as thickeners, and whilst increasing the apparent viscosity will confer a feeling of “quality” to the formulation, this is only one aspect of rheological control. The product itself can be Newtonian or pseudoplastic, thixotropic, be a ringing gel or a stringy flowable liquid.

What are the selection criteria for rheology modifiers?

While working for the above mentioned applications you should consider the following criteria to select rheology modifiers for solvent-based coatings:

• Rheological requirements of the liquid formulation during storage and application.
• Ease of incorporation.
• Physical properties of the dry surface coating.

What are rheological additives?

Coatex’s expertise is based on the rheology or texture of complex formulations based on water and minerals and is reflected in properties such as the stability of mineral suspensions and the storage and application properties of paints. …

What are rheology modifiers used for?

Rheology modifiers from BASF effectively reduce dripping and spattering of paint during roller or brush application. Sag resistance is improved by a rapid but controlled viscosity increase after application. They also reliably prevent sedimentation of pigments during transport and storage of the paint.

Is xanthan gum a rheology modifier?

Aqueous Rheology Modifiers Xanthan gum is a natural sugar so can act as a food source for fungi or bacteria. It is therefore necessary to include a biocide in the formulation.

How do rheology modifiers work?

Increasing the viscosity of a formulation improves stability, by acting as a barrier to sedimentation and creaming and can be altered by adding a rheology modifier. Rheology modifiers are sometimes referred to as thickeners or viscosity modifiers but they do much more than just thicken a formulation.

What is Heur thickener?

HEUR Thickeners are Nonionic Polyurethane Associative Thickeners for waterbased coatings. HEUR Thickeners impart high shear viscosity through the interaction of the thickener with hydrophobic surfaces within the coating formulation. TRiiSO distributes the HIRESOL brand of HASE thickeners.

What is rheology Slideshare?

DEFINITION OF RHEOLOGY  Rheology is the science/physics that concerns with the flow of liquids and the deformation of solids.  Study of flow properties of liquids is important for pharmacist working in the manufacture of several dosage forms, viz., simple liquids, gels, ointments, creams, and pastes.

What is viscosity modifier?

Viscosity modifiers are polymeric molecules that are sensitive to temperature. At low temperatures, the molecule chain contracts and does not impact the fluid viscosity. At high temperatures, the chain relaxes and an increase in viscosity occurs.

Does xanthan gum add volume?

Xanthan gum has a very neutral flavor so it mixes well with foods without masking their flavor. It provides an improved mouthfeel for many preparations, slightly thickening a liquid similar to how traditionally reducing a liquid does.

What is an associative thickener?

Associative thickeners are polymers that are based on water-soluble polymers. These can be acrylate polymers, cellulose ethers or, for the top-quality nonionic products, polyethyleneglycol. These are capped with water-insoluble hydrophobic groups like fatty alcohols, for example.

How are rheology modifiers used in coatings and paints?

In both solvent-based and waterborne formulations, rheology modifiers (also called thickeners for paints) help to achieve the desired rheological behavior. Rheology modifiers help in controlling paint shelf stability, ease of application, open time / wet edge and sagging.

Which is the best rheology modifier for clear gels?

It is an extremely efficient rheology modifier capable of providing high viscosity and forms sparkling clear gels or hydro-alcoholic gels and creams. Its short flow, non-drip properties are ideal for applications such as clear gels, hydroalcholic gels, and creams. Carbopol ® 941 polymer is a white powder, crosslinked polyacrylic acid polymer.

Which is an associative modifier for rheology?

Associative thickeners (AT) are also known as HEUR/ PUR rheology modifiers thickeners. These consist of aqueous solutions of low molecular mass polymers; the thickening mechanism is based on formation of physical interactions with other components in the paint formulation.

How are rheology modifiers used in water borne systems?

Rheology modifiers are also classified as being suitable for water-borne, solvent-based, or solvent-less formulations. In water-borne systems these modifiers are used extensively to adjust the formulation’s flow properties for a specific range of shear rates.