To prepare a stable carbomer gel 940, you need to consider these factors
Release time:
2021-10-12
Preparing stable gels and controlling viscosity is one of the most significant challenges faced by every formulator. Viscosity control is most commonly performed using synthetic (such as polyacrylate) or natural polymers (such as xanthan gum), each of which has its own significant characteristics, advantages and limitations. Carbomer is the most widely used polyacrylic acid polymer in industry, cosmetics, pharmaceuticals, and even oral care products.
Uses of Carbomer 940
The Carbomer family has several members with individual characteristics. All of these are based on acrylates, and each has its own specific characteristics in terms of viscosity, electrolyte resistance, and compatibility with other ingredients. However, the most widely used is Carbomer 940. From cosmetic glitter gel to cuticle remover to gel toothpaste. It is a viscosity modifier, stabilizer, dispersant and emulsifier. When you are away from home, do you have a small bottle of hand sanitizer gel in your wallet for disinfection? Look at the bottle. It contains about 0.5% carbomer.
Features of Carbomer 940
Carbomer 940 is a fluffy, hygroscopic, light white powder, dispersible, but insoluble in water and alcohol. When a polymer is dispersed in water or alcohol, its pH is about 3 (acidic) and forms a turbid medium-viscosity liquid (molecules swell in water but do not dissolve). This liquid is called mucus. Only after neutralizing the acidic mucus with alkali (such as sodium hydroxide solution, the much lower concentration substance we use in lye preparation, or triethylamine) does the polymer chain begin to organize itself.
What factors affect the viscosity of carbomer
Due to the high yield strength of Carbomer Gel, you can disperse and suspend small particles (like the glitter in the picture above) and even bubbles in it. These gels are made from 0.5% mucus. Viscosity (and structure) depends on pH. The highest pH is between 6-7. Excessive neutralization when the pH is higher than 7 will cause the viscosity and transparency of the product to decrease. This is a factor you should consider when choosing a preservative. In the figure below, you can see the viscosity of a 0.5% gel as a function of pH.
However, viscosity is very sensitive to electrolyte. There are other grades of carbomer with higher electrolyte tolerance, but for carbomer 940, as long as the medium contains a small amount of electrolyte, the viscosity will decrease. In the figure below, you can see the viscosity as a function of adding salt (NaCl) to the 0.5% neutralization gel.
In the process of working with Carbomer, the preparation of gel is the most difficult part. If you are interested, you can pay attention to Desheng Technology. I will take you to understand the process of preparing Carbomer gel. Of course, if you think We are very reliable. If we want to buy Carbomer directly, we will also let you experience high-quality products and services at ZUI's preferential price.
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