How many types of rheological additives are there?

Rheological Additive | 5 Types of rheology modifiers.

How many types of rheological additives are?

We offer six classes of rheological additives for paints and coatings: Rheovis^® AS: Alkali swellable emulsions (ASE) Rheovis^® HS: Hydrophobically modified alkali swellable emulsions (HASE) Rheovis^® PU: Hydrophobically modified polyurethanes (HEUR)

What are rheological additives?

With the increasing demand for low-VOC or VOC-free waterborne coating systems, there has been a call for a new class of thickeners -- known as modern rheological additives. These additives allow specific modification of the viscosity of the coating system at various shear rates.

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.

Rheological Additives for Cosmetic Applications - LAPONITE

What is Carbopol used for?

Carbopol® (Carbomer)

In the cosmetic industry, Carbopol is used as a thickener in lotions, creams and gels. It is also used to stabilize, suspend, and control the release of pharmaceutical products. At low concentrations, suspensions flow easily with a slippery feel.

What is Carbomer 940 used for?

Carbomer 940 is a polyvinyl carboxy polymer used as a viscosity enhancer, gelling agent, or suspension agent. Carbomer 940 is cross linked with ethers of pentaerythritol, and is used primarily in systems where sparkling clarity or a sharp viscosity response is required.

What is the meaning of rheological properties?

Rheology is the branch of physics in which we study the way in which materials deform or flowin response to applied forces or stresses. The material properties that govern the specific way in which these deformation or flow behaviors occur are called rheological properties.

What is rheology control?

Rheology modifiers help to achieve desired rheological behavior, helping to control a variety of characteristics, including shelf stability, ease of application, open time/wet edge, sag, resistance, leveling, settling, film forming, regulation compliance and more.

Is viscosity a rheological property?

The property of rheology is viscosity, which is defined as the measure of the resistance of a fluid to gradual deformation by shear or tension.

What is PU thickener?

Polyurethane thickener is a low-odor, solvent-free water-based non-ionic associative rheology modifier (hydrophobic modified polyurethane), providing excellent flow and leveling, uniform film-forming performance, and gloss display Performance and high thickening efficiency.

What is Hase thickener?

HASE Thickeners are Hydrophobically modified Alkali Swellable Emulsions which act as thickeners and antisettling agents in waterbased coatings, inks and putties. Upon neutralization to a pH typically above 8.0, HASE thickeners become active.

What is non associative thickener?

Non-associative thickening occurs due to the entanglement of water-soluble, high molecular weight polymer chains. Formulations thickened this way display good stability and anti-settling properties as they become highly elastic.

What kinds of rheological materials are paint and grease?

Solvent-based rheological additive

Our solvent-based rheology additive is used as gelling and thickening agents. They have major applications such as paints, coatings, grease lubricants, oil drilling fluids, and inks.

What are the rheological models?

Widely used rheological models are • Kelvin model, Maxwell Model and • Burgers Models, which are described here. Several models have been developed to describe the viscoelastic behaviour of materials. There are two basic viscoelastic models viz Kelvin and Maxwell.

What are the examples of rheology?

Many physiological materials and fluids exhibit complicated rheology. Within the eye, examples include the vitreous humour, the liquid in the tear film, and the blood in capillaries.

What are the application of rheology in pharmacy?

Rheological characterization tools, such as viscometers, allow drug producers to directly affect how a drug is formulated and developed, cutting across parameters and conditions to arrive at product characteristics that can be quantified.

What are rheological properties of polymers?

Polymer rheology testing is the study of how the stress in a material or force applied is related to deformation and flow of the material.

What is the importance of rheology?

Researchers believe that rheological characterization is essential for the development, optimization, and processing of foods. Food rheology also determines the food texture. Rheological flow properties deal with the perception of food when we touch or put it into our mouth.

What is the difference between rheology and viscosity?

Viscosity is a quantitative measurement that is useful in chemistry. These two terms are related to fluids such as liquids and gases. The key difference between rheology and viscosity is that rheology is the study of the flow of matter whereas viscosity is a measure of its resistance to deformation.

What is the difference between Carbomer and Carbopol?

Carbopol 934 is cross-linked with allyl sucrose and polymerized in benzene. Carbopol 71, 971, and 974 are cross-linked with allylpentaerythritol and polymerized in ethyl acetate. Carbomer polymers contain 56%–68% of carboxylic acid (–COOH) groups and 0.75%–2% of cross-linking agents.

What is the difference between Carbopol 940 and 980?

The key difference between carbomer 940 and 980 is that carbomer 940 is important as a rheological modifier, while carbomer 980 is important as a thickening agent. Carbomer is the market name of polyacrylate polymer. There are different types of carbomer materials based on their composition and applications.

Is Carbopol a preservative?

Carbopol® polymers will not support mold or bacterial growth, but will not suppress it either. For prolonged storage, preserve the stock solution with materials such as a 1:1 blend of methyl p-hydroxybenzoate/propyl p-hydroxybenzoate at a 0.1% concentration to prevent mold or bacteria growth in the water.

Is Carbomer an emulsifier?

Adding Polymers to Increase the Stability of Emulsions

However, to be more productive, surface-active polymers like hydroxypropyl methylcellulose or carbomer 1342 can be used as primary emulsifiers.