How do you thicken Carbopol?

How do you thicken Carbopol?

In most liquid systems, Carbopol®* polymers require neutralization to thicken most efficiently. Sodium hydroxide, potassium hydroxide, ammonium hydroxide, and some water-soluble organic amines are excellent neutralizing agents for Carbopol® polymers in aqueous systems.

How do you dissolve Carbopol in water?

In pure solvent or at high concentrations in water, the Carbopol® polymer can be directly added with minimal agitation. When using pure solvent, add the polymer/solvent slurry to water, or vice versa, with vigorous (800-1200 rpm) mixing.

How do you mix water with Carbopol?

Using moderate to vigorous agitation (800-1200 rpm), add the oil phase containing Carbopol® polymer to the water phase. The water phase should contain an appropriate neutralizing base. Continue to mix for 15-20 minutes until the Carbopol® polymer has swelled to produce a smooth emulsion.

Is Carbopol soluble in alcohol?

The pH of a 0.5% to 1.0% dispersion is in the range of 2.5 to 3.5. Carbomers are soluble in water; after neutralization, they are soluble in 95% ethanol and glycerin.

Why does the Carbopol solution increase in viscosity with pH?

For carbomer-based gels, which are derivatives of acrylic acid, the required pH is obtained through neutralization: with increasing pH value, the globules of carbomer molecules unfold into a bulk network, creating a structure formation which increases the viscosity of the system.

What is the pH of Carbopol?

Carbopol® polymers must be neutralized in order to achieve maximum viscosity. Once a neutralizer is added to the dispersion, thickening gradually occurs. Maximum viscosity is typically achieved at a pH of 6.0 – 7.0.

Can Carbomer thicken alcohol?

It is important to understand the properties of the thickener being used. An example is carbomers which are highly specialized for their applications – be sure to check it will thicken in the high alcohol concentrations required for the final formulation.

How do you neutralize Carbopol?

The most common way to achieve maximum thickening from Carbopol® and Pemulen™ polymers is by converting the acidic Carbopol® or Pemulen™ polymer to a salt. This is easily achieved by neutralizing the Carbopol® or Pemulen™ polymer with a common base such as sodium hydroxide (NaOH) or triethanolamine (TEA).

Why does Carbopol increase in viscosity with pH?

How do you Neutralise a Carbomer?

Use Triisopropanolamine (Dow Chemical) or Neutrol® TE (BASF) to neutralize Carbomer when gelling up to 90% ethanol. Use granulated grades to reduce dusting issues during manufacturing.

Does carbopol-940® hydrogel show theological behaviour at different concentrations?

The study concerns with the theological behaviour of Carbopol-940® hydrogel at different concentrations. The addition of a neutralizer (NaOH) formed the gel pH in a range between 5.7 and 7.

What determines the rheological behavior of carbopol® ultrez (TM) 10 alcoholic (30%) gels?

The rheological behavior of Carbopol® Ultrez (TM) 10 alcoholic (30%) gels was studied as a function of two main variables: pH (4.0-7.0) and polymer concentration (0.1-0.5%). Flow curves of all hydroalcoholic gels were adjusted to the Ostwald model.

What is carbopol used for?

Carbopol is available in several different grades, which are widely used in manufacture of cosmetics and toiletries, including gels, creams and lotions, detergents, and air fresheners.

What are the disadvantages of carbopol powder?

This can cause dusting problems. When added to the water, Carbopol tends to form agglomerates which are not readily dispersed. Some powders have poor flow properties, making controlled powder addition difficult.

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