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Influence of different hydrogen ion concentration on carbomer viscosity
Different carbomers have different properties, but the basic properties are the same. Carbomer is a very good thickening and suspending agent. The only disadvantage is that it is not resistant to ions, that is, it is not resistant to acids and alkalis. The following comparison of different carbomer viscosities under different hydrogen ion concentrations shows that the hydrogen ion concentration when different carbomers reach the maximum thickening and the pH range within which the carbomer thickening effect is relatively balanced, can be obtained. The pH reference range of personal care products during application.
In this experiment, 200ml of carbomer 940, 980, 1342, U20, U21 dispersion with a mass fraction of 0.1% was used, and a 10% sodium hydroxide solution with a mass fraction of 10% was gradually added dropwise at room temperature. The hydrogen ion concentration was 10- 3. 10-4, 10-5, 10-6, 10-7, 10-8, 10-9, 10-10, 10-11, 10-12 mol/L. Select the appropriate rotor of the viscometer to measure the viscosity of different dispersion liquids, and the speed of the measurement is: 20r/min.
The picture shows the viscosity distribution curve of carbomer dispersion at different hydrogen ion concentrations:
As shown in the figure, the viscosity of the carbomer dispersion first increases and then decreases with the decrease of the hydrogen ion concentration, that is, the thickening efficiency increases from high to low, and the hydrogen ion concentration when the different carbomer reaches the maximum viscosity There are differences, but the viscosity values of the five carbomers are relatively stable when the hydrogen ion concentration is between 10-6 and 10-7, and there is little change. The main reason for the above phenomenon is excessive neutralizer It acts as a discrete ion in the solution. Therefore, the hydrogen ion concentration of the personal care product system added with carbomer should be adjusted between 10-6～10-7. If you compare the viscosity of different carbomers, you can also adjust the carbomer The pH of the dispersion is adjusted to this range.
Carbomer 940 and Carbomer 980 reach the maximum viscosity of hydrogen ion concentration at 10-8mol/L,
The hydrogen ion concentration when Carbomer 1342 reaches the maximum viscosity is 10-6mol/L, while the hydrogen ion concentration when Carbomer U20 and Carbomer U21 reach the maximum viscosity is 10-5mol/L. It can be seen that during the development of carbomer resin, the hydrogen ion concentration for maximum thickening effect gradually tends to be weakly acidic, which is in line with the pH range required by most personal care products.
Desheng is a carbomer manufacturer, mainly producing carbomer 940 and carbomer 980. The carbomer 940 and 980 powder produced by it are obviously white, and the powder is very fluffy and delicate. After being configured as a solvent, the transparency is much higher than similar products. And the conventional carbomer is configured into a gel, which is more transparent in appearance, and the viscosity can also be customized and adjusted according to individual indicators. In addition, Desheng has perfect after-sales service, Desheng promises that any quality problems can be returned and replaced. You can apply for a free sample trial, so you can try it first and then buy it. With such excellent quality, what are you still considering?